Carrier 48TC_D08 User Manual

48TC*D08---D14

Nominal 7.5 to 12.5 Tons

With Puron® (R---410A) Refrigerant

Service and Maintenance Instructions

TABLE OF CONTENTS

SAFETY CONSIDERATIONS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1

UNIT ARRANGEMENT AND ACCESS . . . . . . . . . . . 2

SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 4

COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PURONR (R-410A) REFRIGERANT . . . . . . . . . . . . . . 8

COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . 10

CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . 16

SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . . 17

PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . . 24

GAS HEATING SYSTEM . . . . . . . . . . . . . . . . . . . . . . 25

CONDENSER COIL SERVICE . . . . . . . . . . . . . . . . . . 35

PREMIERLINKt CONTROL . . . . . . . . . . . . . . . . . . . 36

RTU-MP CONTROL SYSTEM . . . . . . . . . . . . . . . . . . 44

ECONOMI$ER SYSTEMS . . . . . . . . . . . . . . . . . . . . . . 57

WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . 66

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . 69

START-UP, PREMIERLINK CONTROL . . . . . . . . . . 71

START-UP, RTU-MP CONTROL . . . . . . . . . . . . . . . . 71

OPERATING SEQUENCES . . . . . . . . . . . . . . . . . . . . . 75

FASTENER TORQUE VALUES . . . . . . . . . . . . . . . . . 85

APPENDIX I. MODEL NUMBER SIGNIFICANCE . 87

APPENDIX II. PHYSICAL DATA . . . . . . . . . . . . . . . . 88

APPENDIX III. FAN PERFORMANCE . . . . . . . . . . . 90

APPENDIX IV. WIRING DIAGRAM LIST . . . . . . . . 96

Installation and servicing of air-conditioning equipment

can be hazardous due to system pressure and electrical

components. Only trained and qualified service personnel

should install, repair, or service air-conditioning

equipment. Untrained personnel can perform the basic

maintenance functions of replacing filters. Trained service

personnel should perform all other operations.

When working on air-conditioning equipment, observe

precautions in the literature, tags and labels attached to

the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for unbrazing operations.

Have fire extinguishers available for all brazing

operations.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for brazing operations. Have

fire extinguisher available. Read these instructions

thoroughly and follow all warnings or cautions attached to

the unit. Consult local building codes and National

Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety-alert

symbol

. When you see this symbol on the unit and in

instructions or manuals, be alert to the potential for

personal injury.

Understand the signal words DANGER, WARNING, and

CAUTION. These words are used with the safety-alert

symbol. DANGER identifies the most serious hazards

which will result in severe personal injury or death.

WARNING signifies a hazard which could result in

personal injury or death. CAUTION is used to identify

unsafe practices which may result in minor personal

injury or product and property damage. NOTE is used to

highlight suggestions which will result in enhanced

installation, reliability, or operation.

APPENDIX V. MOTORMASTER SENSOR

LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

UNIT START-UP CHECKLIST . . . . . . . . . . . . . . . . . . 98

Heating

S Heat exchanger flue passageways cleanliness

S Gas burner condition

S Gas manifold pressure

S Heating temperature rise

Economizer or Outside Air Damper

S Inlet filters condition

BLOWER

ACCESS

PANEL

S Check damper travel (economizer)

S Check gear and dampers for debris and dirt

Air Filters and Screens

FLUE OPENING

CONTROL BOX

COMPRESSOR

C08450

Each unit is equipped with return air filters. If the unit has

an economizer, it will also have an outside air screen. If a

manual outside air damper is added, an inlet air screen

will also be present.

Fig. 2 - Typical Access Panel Location (Front)

Routine Maintenance

These items should be part of a routine maintenance

program, to be checked every month or two, until a

specific schedule for each can be identified for this

installation:

Each of these filters and screens will need to be

periodically replaced or cleaned.

Return Air Filters

Quarterly Inspection (and 30 days after initial start)

S Return air filter replacement

Return air filters are disposable fiberglass media type.

Access to the filters is through the small lift-out panel

located on the rear side of the unit, above the

evaporator/return air access panel. (See Fig. 1.)

S Outdoor hood inlet filters cleaned

S Belt tension checked

To remove the filters:

S Belt condition checked

S Pulley alignment checked

1. Grasp the bottom flange of the upper panel.

S Fan shaft bearing locking collar tightness checked

S Condenser coil cleanliness checked

S Condensate drain checked

2. Lift up and swing the bottom out until the panel dis-

engages and pulls out.

3. Reach inside and extract the filters from the filter

rack.

4. Replace these filters as required with similar replace-

ment filters of same size.

Seasonal Maintenance

These items should be checked at the beginning of each

season (or more often if local conditions and usage

patterns dictate):

To re-install the access panel:

1. Slide the top of the panel up under the unit top panel.

2. Slide the bottom into the side channels.

Air Conditioning

S Condenser fan motor mounting bolts tightness

S Compressor mounting bolts

S Condenser fan blade positioning

S Control box cleanliness and wiring condition

S Wire terminal tightness

3. Push the bottom flange down until it contacts the top

of the lower panel (or economizer top).

IMPORTANT: DO NOT OPERATE THE UNIT

WITHOUT THESE FILTERS!

Outside Air Hood

S Refrigerant charge level

Outside air hood inlet screens are permanent

aluminum-mesh type filters. Check these for cleanliness.

Remove the screens when cleaning is required. Clean by

washing with hot low-pressure water and soft detergent

and replace all screens before restarting the unit. Observe

the flow direction arrows on the side of each filter frame.

S Evaporator coil cleaning

S Evaporator blower motor amperage

Economizer Inlet Air Screen

This air screen is retained by spring clips under the top

edge of the hood. (See Fig. 3.)

SUPPLY FAN (BLOWER) SECTION

22 3/8 (569 mm)

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal

injury or death.

DIVIDER

Before performing service or maintenance operations

on the fan system, shut off all unit power and tag-out

the unit disconnect switch. Do not reach into the fan

section with power still applied to unit.

OUTSIDE

AIR

HOOD

CLEANABLE

FILTER

ALUMINUM

FILTER

Supply Fan (Belt--Drive)

The supply fan system consists of a forward-curved

centrifugal blower wheel on a solid shaft with two

concentric type bearings, one on each side of the blower

housing. A fixed-pitch driven pulley is attached to the fan

shaft and an adjustable-pitch driver pulley is on the

motor. The pulleys are connected using a “V” type belt.

(See Fig. 5.)

BAROMETRIC

RELIEF

FILTER

CAP

C08634

Fig. 3 - Filter Installation

To remove the filter, open the spring clips. Re-install the

filter by placing the frame in its track, then closing the

spring clips.

Manual Outside Air Hood Screen

This inlet screen is secured by a retainer angle across the

top edge of the hood. (See Fig. 4.)

C07087

Fig. 5 - Belt Drive Motor Mounting

Belt

Check the belt condition and tension quarterly. Inspect the

belt for signs of cracking, fraying or glazing along the

inside surfaces. Check belt tension by using a spring-force

tool (such as Browning’s Part Number “Belt Tension

Checker” or equivalent tool); tension should be 6-lbs at a

5/8-in. deflection when measured at the centerline of the

belt span. This point is at the center of the belt when

measuring the distance between the motor shaft and the

blower shaft.

C07156

Fig. 4 - Screens Installed on Outdoor-Air Hood

(Sizes 7-1/2 to 12-1/2 Tons Shown)

To remove the screen, loosen the screws in the top retainer

and slip the retainer up until the filter can be removed.

Re-install by placing the frame in its track, rotating the

retainer back down and tighten all screws.

NOTE: Without the spring-tension tool, place a straight

edge across the belt surface at the pulleys, then deflect the

belt at mid-span using one finger to a 1/2-in. deflection.

Adjust belt tension by loosening the motor mounting plate

front bolts and rear bolt and sliding the plate toward the

fan (to reduce tension) or away from fan (to increase

tension). Ensure the blower shaft and the motor shaft are

parallel to each other (pulleys aligned). Tighten all bolts

when finished.

To replace the belt:

To align fan and motor pulleys:

1. Loosen fan pulley setscrews.

2. Slide fan pulley along fan shaft. Make angular align-

ment by loosening motor from mounting.

3. Tighten fan pulley setscrews and motor mounting

bolts to torque specifications.

4. Recheck belt tension.

1. Use a belt with same section type or similar size. Do

not substitute a “FHP” type belt. When installing the

new belt, do not use a tool (screwdriver or pry-bar) to

force the belt over the pulley flanges, this will stress

the belt and cause a reduction in belt life.

2. Loosen the motor mounting plate front bolts and rear

bolts.

3. Push the motor and its mounting plate towards the

blower housing as close as possible to reduce the cen-

ter distance between fan shaft and motor shaft.

4. Remove the belt by gently lifting the old belt over

one of the pulleys.

5. Install the new belt by gently sliding the belt over

both pulleys and then sliding the motor and plate

away from the fan housing until proper tension is

achieved.

6. Check the alignment of the pulleys, adjust if neces-

sary.

7. Tighten all bolts.

8. Check the tension after a few hours of runtime and

re-adjust as required.

C07075

Fig. 6 - Supply-Fan Pulley Adjustment

Adjustable-Pitch Pulley on Motor

Bearings

The motor pulley is an adjustable-pitch type that allows a

servicer to implement changes in the fan wheel speed to

match as-installed ductwork systems. The pulley consists

of a fixed flange side that faces the motor (secured to the

motor shaft) and a movable flange side that can be rotated

around the fixed flange side that increases or reduces the

pitch diameter of this driver pulley. (See Fig. 6.)

This fan system uses bearings featuring concentric split

locking collars. The collars are tightened through a cap

screw bridging the split portion of the collar. The cap

screw has a Torx T25 socket head. To tighten the locking

collar: Hold the locking collar tightly against the inner

race of the bearing and torque the cap screw to 65-70

in-lb (7.4-7.9 Nm). (See Fig. 7.)

As the pitch diameter is changed by adjusting the position

of the movable flange, the centerline on this pulley shifts

laterally (along the motor shaft). This creates

requirement for a realignment of the pulleys after any

adjustment of the movable flange. Also reset the belt

tension after each realignment.

Check the condition of the motor pulley for signs of wear.

Glazing of the belt contact surfaces and erosion on these

surfaces are signs of improper belt tension and/or belt

slippage. Pulley replacement may be necessary.

To change fan speed:

1. Shut off unit power supply.

2. Loosen belt by loosening fan motor mounting nuts.

(See Fig. 5.)

C08121

Fig. 7 - Tightening Locking Collar

3. Loosen movable pulley flange setscrew. (See Fig. 6.)

Motor

4. Screw movable flange toward fixed flange to increase

speed and away from fixed flange to decrease speed.

Increasing fan speed increases load on motor. Do not

exceed maximum speed specified.

5. Set movable flange at nearest keyway of pulley hub

and tighten setscrew to torque specifications.

When replacing the motor, also replace the external-tooth

lock washer (star washer) under the motor mounting base;

this is part of the motor grounding system. Ensure the

teeth on the lock washer are in contact with the motor’s

painted base. Tighten motor mounting bolts to 120 +/- 12

in-lbs.

TUBES

Changing fan wheel speed by changing pulleys: The

horsepower rating of the belt is primarily dictated by the

pitch diameter of the smaller pulley in the drive system

(typically the motor pulley in these units). Do not install a

replacement motor pulley with a smaller pitch diameter

than provided on the original factory pulley. Change fan

wheel speed by changing the fan pulley (larger pitch

diameter to reduce wheel speed, smaller pitch diameter to

increase wheel speed) or select a new system (both

pulleys and matching belt(s)).

FINS

Before changing pulleys to increase fan wheel speed,

check the fan performance at the target speed and airflow

rate to determine new motor loading (bhp). Use the fan

performance tables or use the Packaged Rooftop Builder

software program. Confirm that the motor in this unit is

capable of operating at the new operating condition. Fan

shaft loading increases dramatically as wheel speed is

increased.

MANIFOLD

MICROCHANNELS

C07273

Fig. 8 - Microchannel Coils

Evaporator Coil

The evaporator coil is traditional round-tube, plate-fin

technology. Tube and fin construction is of various

optional materials and coatings (see Model Number

Format). Coils are multiple-row.

To reduce vibration, replace the motor’s adjustable pitch

pulley with a fixed pitch pulley (after the final airflow

balance adjustment). This will reduce the amount of

vibration generated by the motor/belt-drive system.

Coil Maintenance and Cleaning Recommendation

COOLING

Routine cleaning of coil surfaces is essential to maintain

proper operation of the unit. Elimination of contamination

and removal of harmful residues will greatly increase the

life of the coil and extend the life of the unit. The

following maintenance and cleaning procedures are

recommended as part of the routine maintenance activities

to extend the life of the coil.

WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal

injury, death and/or equipment damage.

Remove Surface Loaded Fibers

This system uses PuronR refrigerant which has higher

pressures than R-22 and other refrigerants. No other

refrigerant may be used in this system. Gauge set,

hoses, and recovery system must be designed to

handle Puron refrigerant. If unsure about equipment,

consult the equipment manufacturer.

Surface loaded fibers or dirt should be removed with a

vacuum cleaner. If a vacuum cleaner is not available, a

soft non-metallic bristle brush may be used. In either

case, the tool should be applied in the direction of the fins.

Coil surfaces can be easily damaged (fin edges can be

easily bent over and damage to the coating of a protected

coil) if the tool is applied across the fins.

Condenser Coil

The condenser coil is new NOVATION Heat Exchanger

Technology. This is an all-aluminum construction with

NOTE: Use of a water stream, such as a garden hose,

against a surface loaded coil will drive the fibers and dirt

into the coil. This will make cleaning efforts more

difficult. Surface loaded fibers must be completely

removed prior to using low velocity clean water rinse.

louvered fins over single-depth crosstubes.

The

crosstubes have multiple small passages through which

the refrigerant passes from header to header on each end.

Tubes and fins are both aluminum construction.

Connection tube joints are copper. The coil may be

one-row or two-row. Two-row coils are spaced apart to

assist in cleaning.

Periodic Clean Water Rinse

A periodic clean water rinse is very beneficial for coils

that are applied in coastal or industrial environments.

However, it is very important that the water rinse is made

with very low velocity water stream to avoid damaging

the fin edges. Monthly cleaning as described below is

recommended.

Routine Cleaning of NOVATION Condenser Coil

Surfaces

Totaline Environmentally Sound Coil Cleaner Application

Equipment

S 2-1/2 gallon garden sprayer

To clean the NOVATION condenser coil, chemicals are

NOT to be used; only water is approved as the cleaning

solution. Only clean potable water is authorized for

cleaning NOVATION condensers. Carefully remove any

foreign objects or debris attached to the coil face or

trapped within the mounting frame and brackets. Using a

high pressure water sprayer, purge any soap or industial

cleaners from hose and/or dilution tank prior to wetting

the coil.

S water rinse with low velocity spray nozzle

CAUTION

PERSONAL INJURY HAZARD

Failure to follow this caution may result in corrosion

and damage to the unit.

Harsh chemicals, household bleach or acid or basic

cleaners should not be used to clean outdoor or indoor

coils of any kind. These cleaners can be very difficult

to rinse out of the coil and can accelerate corrosion at

the fin/tube interface where dissimilar materials are in

contact. If there is dirt below the surface of the coil,

use the Totaline environmentally sound coil cleaner as

described above.

Clean condenser face by spraying the coil core steadily

and uniformly from top to bottom, directing the spray

straight into or toward the coil face. Do not exceed 900

psig or a 45 degree angle; nozzle must be at least 12 in.

(30 cm) from the coil face. Reduce pressure and use

caution to prevent damage to air centers (fins). Do not

fracture the braze between air centers and refrigerant

tubes. Allow water to drain from the coil core and check

for refrigerant leaks prior to start-up.

NOTE: Please see the NOVATION Condenser Service

section for specific information on the coil.

CAUTION

PERSONAL INJURY HAZARD

CAUTION

Failure to follow this caution may result in reduced

unit performance.

PERSONAL INJURY HAZARD

High velocity water from a pressure washer, garden

hose, or compressed air should never be used to clean

a coil. The force of the wter or air jet will bend the fin

edges and icrease airside pressure drop.

Failure to follow this caution may result in personal

injury or equipment damage.

Chemical cleaning should NOT be used on the

aluminum NOVATION condenser. Damage to the coil

may occur. Only approved cleaning is recommended.

Totaline Environmentally Sound Coil Cleaner application

Instructions

Routine Cleaning of Evaporator Coil Sufaces

1. Proper eye protection such as safety glasses is recom-

mended during mixing and application.

2. Remove all surface loaded fibers and dirt with a vacu-

um cleaner as described above.

3. Thoroughly wet finned surfaces with clean water and

a low velocity garden hose, being carefull not to bend

fins.

4. Mix Totaline environmentally sound coil cleaner in a

2 1/2 gallon garden spryer according to the instruc-

tions included with the cleaner. The optimum solution

temperature is 100°F (38°C).

Monthly cleaning with Totaline® environmentally sound

coil cleaner is essential to extend the life of coils. This

cleaner is available from Carrier Replacement parts

division as part number P902-0301 for one gallon

container, and part number P902-0305 for a 5 gallon

container. It is recommended that all round tube coil

cleaner as described below. Coil cleaning should be part

of the unit’s regularly scheduled maintenance procedures

to ensure long life of the coil. Failure to clean the coils

may result in reduced durability in the environment.

Avoid the use of

NOTE: Do NOT USE water in excess of 130°F (54°C),

as the enzymatic activity will be destroyed.

S coil brighteners

1. Thoroughly apply Totaline® environmentally sound

coil cleaner solution to all coil surfaces including

finned area, tube sheets and coil headers.

2. Hold garden sprayer nozzle close to finned areas and

apply cleaner with a vertical, up-and-down motion.

Avoid spraying in horizontal pattern to minimize po-

tential for fin damage.

3. Ensure cleaner thoroughly penetrates deep into finned

areas.

4. Interior and exterior finned areas must be thoroughly

cleaned.

S acid cleaning prior to painting

S high pressure washers

S poor quality water for cleaning

Totaline environmentally sound coil cleaner is

non-flammable, hypoallergenic, non-bacterial, and a

USDA accepted biodegradable agent that will not harm

coil or surrounding components such as electrical wiring,

painted metal surfaces, or insulation. Use of

non-recommended coil cleaners is strongly discouraged

since coil and unit durability could be affected.

5. Finned surfaces should remain wet with cleaning

solution for 10 minutes.

6. Ensure surfaces are not allowed to dry before rinsing.

Reapply cleaner as needed to ensure 10-minute satur-

ation is achieved.

7. Thoroghly rinse all surfaces with low velocity clean

water using downward rinsing motion of water spray

nozzle. Protect fins from damage from the spray

nozzle.

Because Puron (R-410A) refrigerant is a blend, it is

strongly recommended that refrigerant always be removed

from the cylinder as a liquid. Admit liquid refrigerant into

the system in the discharge line. If adding refrigerant into

the suction line, use a commercial metering/expansion

device at the gauge manifold; remove liquid from the

cylinder, pass it through the metering device at the gauge

set and then pass it into the suction line as a vapor. Do not

remove Puron (R-410A) refrigerant from the cylinder as a

vapor.

Evaporator Coil Metering Devices

Refrigerant Charge

The metering devices are multiple fixed-bore devices

(Acutrolt) swaged into the horizontal outlet tubes from

the liquid header, located at the entrance to each

evaporator coil circuit path. These are non-adjustable.

Service requires replacing the entire liquid header

assembly.

Amount of refrigerant charge is listed on the unit’s

nameplate. Refer to Carrier GTAC2-5 Charging,

Recovery, Recycling and Reclamation training manual

and the following procedures.

Unit panels must be in place when unit is operating during

the charging procedure. To prepare the unit for charge

adjustment.

To check for possible blockage of one or more of these

metering devices, disconnect the supply fan contactor

(IFC) coil, then start the compressor and observe the

frosting pattern on the face of the evaporator coil. A frost

pattern should develop uniformly across the face of the

coil starting at each horizontal header tube. Failure to

develop frost at an outlet tube can indicate a plugged or a

missing orifice.

No Charge

Use standard evacuating techniques. After evacuating

system, weigh in the specified amount of refrigerant.

Low-Charge Cooling

Using Cooling Charging Charts (Figs. 10, 11, 12, and 13),

vary refrigerant until the conditions of the appropriate

chart are met. Note the charging charts are different from

the type normally used. Charts are based on charging the

units to the correct superheat for the various operating

conditions. Accurate pressure gauge and temperature

sensing device are required. Connect the pressure gauge to

the service port on the suction line. Mount the temperature

sensing device on the suction line and insulate it so that

outdoor ambient temperature does not affect the reading.

Indoor-air cfm must be within the normal operating range

of the unit.

Refrigerant System Pressure Access Ports

There are two access ports in the system - on the suction

tube near the compressor and on the discharge tube near

the compressor. These are brass fittings with black plastic

caps. The hose connection fittings are standard 1/4 SAE

male flare couplings.

The brass fittings are two-piece High Flow valves, with a

receptacle base brazed to the tubing and an integral

spring-closed check valve core screwed into the base. (See

Fig. 9.) This check valve is permanently assembled into

this core body and cannot be serviced separately; replace

the entire core body if necessary. Service tools are

available from RCD that allow the replacement of the

check valve core without having to recover the entire

system refrigerant charge. Apply compressor refrigerant

oil to the check valve core’s bottom O-ring. Install the

fitting body with 96 +/- 10 in-lbs of torque; do not

overtighten.

To Use Cooling Charging Charts

Select the appropriate unit charging chart from Figs. 10,

11, 12, and 13.

S Sizes D08 and D12 each have one cooling charging chart

S Size D14 has two cooling charging charts: Circuit A and

Circuit B

Take the outdoor ambient temperature and read the

suction pressure gauge. Refer to chart to determine what

suction temperature should be. If suction temperature is

high, add refrigerant. If suction temperature is low,

carefully recover some of the charge. Recheck the suction

pressure as charge is adjusted.

PURONR (R--410A) REFRIGERANT

This unit is designed for use with Puron (R-410A)

refrigerant. Do not use any other refrigerant in this

system.

Puron (R-410A) refrigerant is provided in pink (rose)

colored cylinders. These cylinders are available with and

without dip tubes; cylinders with dip tubes will have a

label indicating this feature. For a cylinder with a dip

tube, place the cylinder in the upright position (access

valve at the top) when removing liquid refrigerant for

charging. For a cylinder without a dip tube, invert the

cylinder (access valve on the bottom) when removing

liquid refrigerant.

For D14 size, perform this procedure once for Circuit A

(using the Circuit A chart) and once for Circuit B (using

the Circuit B chart).

SEAT

CORE

(Part No. EC39EZ067)

1/2-20 UNF RH

0.596

45^o

30^o

WASHER

O-RING

DEPRESSOR PER ARI 720

+.01/-.035

FROM FACE OF BODY

1/2" HEX

.47

5/8” HEX

7/16-20 UNF RH

This surface provides a metal to metal seal when

torqued into the seat. Appropriate handling is

required to not scratch or dent the surface.

C08453

Fig. 9 - CoreMax Access Port Assembly

EXAMPLE:

Model 48TC*D14

Circuit A:

Outdoor Temperature . . . . . . . . . . . . . . . . . . 85_F (29_C)

Suction Pressure . . . . . . . . . . . . . . . . . 125 psig (860 kPa)

Suction Temperature should be . . . . . . . . . . 58_F (14_C)

Circuit B:

Outdoor Temperature . . . . . . . . . . . . . . . . . . 85_F (29_C)

Suction Pressure . . . . . . . . . . . . . . . . . 120 psig (830 kPa)

Suction Temperature should be . . . . . . . . . . 60_F (16_C)

COOLING CHARGING CHARTS

C08669

Fig. 10 - Cooling Charging Charts (D08)

COOLING CHARGING CHARTS

C08670

Fig. 11 - Cooling Charging Charts (D12)

COOLING CHARGING CHARTS

C09151

Fig. 12 - Cooling Charging Charts (D14 - Circuit A)

COOLING CHARGING CHARTS

C09152

Fig. 13 - Cooling Charging Charts (D14 - Circuit B)

Table 1 – Cooling Service Analysis

PROBLEM

CAUSE

REMEDY

Power failure.

Fuse blown or circuit breaker tripped.

Call power company.

Replace fuse or reset circuit breaker.

Defective thermostat, contactor, transformer,

or control relay.

Insufficient line voltage.

Incorrect or faulty wiring.

Thermostat setting too high.

Replace component.

Compressor and Condenser

Fan Will Not Start.

Determine cause and correct.

Check wiring diagram and rewire correctly.

Lower thermostat setting below room temperature.

Faulty wiring or loose connections in

compressor circuit.

Compressor motor burned out, seized, or

internal overload open.

Defective run/start capacitor, overload, start

relay.

Check wiring and repair or replace.

Determine cause. Replace compressor.

Determine cause and replace.

Compressor Will Not Start But

Condenser Fan Runs.

Replace fuse or reset circuit breaker. Determine

cause.

Recover refrigerant, evacuate system, and recharge

to nameplate.

One leg of three---phase power dead.

Refrigerant overcharge or undercharge.

Defective compressor.

Insufficient line voltage.

Blocked condenser.

Defective run/start capacitor, overload, or start

relay.

Replace and determine cause.

Determine cause and correct.

Compressor Cycles (other

than normally satisfying

thermostat).

Determine cause and replace.

Defective thermostat.

Replace thermostat.

Faulty condenser---fan motor or capacitor.

Restriction in refrigerant system.

Dirty air filter.

Replace.

Locate restriction and remove.

Replace filter.

Unit undersized for load.

Thermostat set too low.

Low refrigerant charge.

Leaking valves in compressor.

Air in system.

Decrease load or increase unit size.

Reset thermostat.

Locate leak; repair and recharge.

Replace compressor.

Recover refrigerant, evacuate system, and recharge.

Clean coil or remove restriction.

Replace filter.

Compressor Operates

Continuously.

Condenser coil dirty or restricted.

Dirty air filter.

Dirty condenser coil.

Clean coil.

Refrigerant overcharged.

Air in system.

Recover excess refrigerant.

Recover refrigerant, evacuate system, and recharge.

Determine cause and correct.

Check for leaks; repair and recharge.

Replace compressor.

Remove restriction.

Check for source and eliminate.

Replace compressor.

Excessive Head Pressure.

Condenser air restricted or air short---cycling.

Low refrigerant charge.

Compressor valves leaking.

Restriction in liquid tube.

High head load.

Compressor valves leaking.

Refrigerant overcharged.

Dirty air filter.

Head Pressure Too Low.

Excessive Suction Pressure.

Recover excess refrigerant.

Replace filter.

Low refrigerant charge.

Metering device or low side restricted.

Check for leaks; repair and recharge.

Remove source of restriction.

Suction Pressure Too Low.

Increase air quantity. Check filter and replace if

necessary.

Insufficient evaporator airflow.

Temperature too low in conditioned area.

Outdoor ambient below 25° F.

Reset thermostat.

Install low---ambient kit.

Evaporator Fan Will Not Shut

Off.

Time off delay not finished.

Wa it f o r 3 0 --- se co n d o f f d e la y.

Compressor Makes Excessive

Noise.

Compressor rotating in wrong direction.

Reverse the 3---phase power leads.

6. Reverse any two of the unit power leads.

7. Reapply power to the compressor.

Compressors

Lubrication

The suction and discharge pressure levels should now

move to their normal start-up levels.

Compressors are charged with the correct amount of oil at

the factory.

NOTE: When the compressor is rotating in the wrong

direction, the unit makes an elevated level of noise and

does not provide cooling.

CAUTION

Filter Drier

UNIT DAMAGE HAZARD

Failure to follow this caution may result in damage to

components.

Replace whenever refrigerant system is exposed to

atmosphere. Only use factory specified liquid-line filter

driers with working pressures no less than 650 psig. Do

not install a suction-line filter drier in liquid line. A

liquid-line filter drier designed for use with Puron

refrigerant is required on every unit.

The compressor is in a PuronR refrigerant system and

uses a polyolester (POE) oil. This oil is extremely

hygroscopic, meaning it absorbs water readily. POE

oils can absorb 15 times as much water as other oils

designed for HCFC and CFC refrigerants. Avoid

exposure of the oil to the atmosphere.

Condenser--Fan Adjustment (D08--D12 size)

1. Shut off unit power supply. Install lockout tag.

2. Remove condenser-fan assembly (grille, motor, and

fan).

3. Loosen fan hub setscrews.

4. Adjust fan height as shown in Fig. 14.

5. Tighten setscrews to 84 in-lbs (9.5 N-m).

6. Replace condenser-fan assembly.

WARNING

PERSONAL INJURY AND ENVIRONMENTAL

HAZARD

Failure to follow this warning could result in personal

injury or death.

Relieve pressure and recover all refrigerant before

system repair or final unit disposal.

Wear safety glasses and gloves when handling

refrigerants.

CONDUIT

Keep torches and other ignition sources away from

refrigerants and oils.

0.14 in +0.0/-0.03

C08448

Fig. 14 - Condenser Fan Adjustment (D08-D12)

Replacing Compressor

The compressor used with Puron refrigerant contains a

POE oil. This oil has a high affinity for moisture. Do not

remove the compressor’s tube plugs until ready to insert

the unit suction and discharge tube ends.

Condenser--Fan Adjustment (D14 size)

1. Shut off unit power supply. Install lockout tag.

2. Remove condenser fan grille.

3. Loosen fan hub setscrews.

Compressor mounting bolt torque is 65-75 in-lbs

(7.3-8.5 N-m).

4. Adjust fan height as shown in Fig. 15.

5. Tighten setscrews to 84 in-lbs (9.5 N-m).

6. Replace fan grille.

Compressor Rotation

On 3-phase units with scroll compressors, it is important

to be certain compressor is rotating in the proper

direction. To determine whether or not compressor is

rotating in the proper direction:

1. Connect service gauges to suction and discharge pres-

sure fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge

pressure should rise, as is normal on any start-up.

NOTE: If the suction pressure does not drop and the

C09094

discharge pressure does not rise to normal levels:

Fig. 15 - Condenser Fan Adjustment (D14)

4. Note that the evaporator fan is probably also rotating

in the wrong direction.

5. Turn off power to the unit.

Troubleshooting Cooling System

Refer to Table 1 for additional troubleshooting topics.

The primary leads to the convenience outlet transformer

are not factory-connected. Selection of primary power

source is a customer-option. If local codes permit, the

transformer primary leads can be connected at the

CONVENIENCE OUTLETS

WARNING

line-side terminals on

unit-mounted non-fused

ELECTRICAL OPERATION HAZARD

disconnect or circuit-breaker switch; this will provide

service power to the unit when the unit disconnect switch

or circuit-breaker is open. Other connection methods will

result in the convenience outlet circuit being de-energized

when the unit disconnect or circuit-breaker is open. (See

Fig. 17.)

Failure to follow this warning could result in personal

injury or death.

Units with convenience outlet circuits may use

multiple disconnects. Check convenience outlet for

power status before opening unit for service. Locate

its disconnect switch, if appropriate, and open it.

Tag-out this switch, if necessary.

Two types of convenience outlets are offered on 48TC

models: Non-powered and unit-powered. Both types

provide a 125-volt GFCI (ground-fault circuit-interrupter)

duplex receptacle rated at 15-A behind a hinged

waterproof access cover, located on the end panel of the

unit. (See Fig. 16.)

Pwd-CO Transformer

Conv Outlet

GFCI

Pwd-CO

Fuse

Switch

CO8283

Fig. 17 - Powered Convenience Outlet Wiring

UNIT

VOLTAGE

CONNECT

PRIMARY

CONNECTIONS

TRANSFORMER

TERMINALS

C08128

Fig. 16 - Convenience Outlet Location

208,

230

L1: RED +YEL

L2: BLU + GRA

L1: RED

Splice BLU + YEL

L2: GRA

H1 + H3

H2 + H4

H2 + H3

240

480

600

Non--Powered Type

460

575

This type requires the field installation of

L1: RED

L2: GRA

general-purpose 125-volt 15-A circuit powered from a

source elsewhere in the building. Observe national and

local codes when selecting wire size, fuse or breaker

requirements and disconnect switch size and location.

Route 125-v power supply conductors into the bottom of

the utility box containing the duplex receptacle.

Duty Cycle

The unit-powered convenience outlet has a duty cycle

limitation. The transformer is intended to provide power

on an intermittent basis for service tools, lamps, etc; it is

not intended to provide 15-amps loading for continuous

duty loads (such as electric heaters for overnight use).

Observe a 50% limit on circuit loading above 8-amps

(i.e., limit loads exceeding 8-amps to 30 minutes of

operation every hour).

Unit--Powered Type

unit-mounted transformer is factory-installed to

stepdown the main power supply voltage to the unit to

115-v at the duplex receptacle. This option also includes a

manual switch with fuse, located in a utility box and

mounted on a bracket behind the convenience outlet;

access is through the unit’s control box access panel. (See

Fig. 16.)

Maintenance

Periodically test the GFCI receptacle by pressing the

TEST button on the face of the receptacle. This should

cause the internal circuit of the receptacle to trip and open

the receptacle. Check for proper grounding wires and

power line phasing if the GFCI receptacle does not trip as

required. Press the RESET button to clear the tripped

condition.

Duct smoke sensor

controller

Conduit nuts

(supplied by installer)

Fuse On Powered Type

Conduit support plate

The factory fuse is a Bussman “Fusetron” T-15,

non-renewable screw-in (Edison base) type plug fuse.

Terminal block cover

Cover gasket

(ordering option)

Controller housing

and electronics

Using Unit--Mounted Convenience Outlets

Controller cover

Conduit couplings

(supplied by installer)

Units with unit-mounted convenience outlet circuits will

often require that two disconnects be opened to

de-energize all power to the unit. Treat all units as

electrically energized until the convenience outlet power

is also checked and de-energization is confirmed. Observe

National Electrical Code Article 210, Branch Circuits, for

use of convenience outlets.

Fastener

(2X)

Trouble

Alarm

Power

Test/reset

switch

SMOKE DETECTORS

Smoke detectors are available as factory-installed options

on 48TC models. Smoke detectors may be specified for

Supply Air only or for Return Air without or with

economizer or in combination of Supply Air and Return

Air. Return Air smoke detectors are arranged for vertical

return configurations only. All components necessary for

operation are factory-provided and mounted. The unit is

factory-configured for immediate smoke detector

shutdown operation; additional wiring or modifications to

unit terminal board may be necessary to complete the unit

and smoke detector configuration to meet project

requirements.

C08208

Fig. 18 - Controller Assembly

Sensor

The sensor (see Fig. 19) includes a plastic housing, a

printed circuit board, a clear plastic cover, a sampling

tube inlet and an exhaust tube. The sampling tube (when

used) and exhaust tube are attached during installation.

The sampling tube varies in length depending on the size

of the rooftop unit. The clear plastic cover permits visual

inspections without having to disassemble the sensor. The

cover attaches to the sensor housing using four captive

screws and forms an airtight chamber around the sensing

electronics. Each sensor includes a harness with an RJ45

terminal for connecting to the controller. Each sensor has

four LEDs (for Power, Trouble, Alarm and Dirty) and a

manual test/reset button (on the left-side of the housing).

System

The smoke detector system consists of a four-wire

controller and one or two sensors. Its primary function is

to shut down the rooftop unit in order to prevent smoke

from circulating throughout the building. It is not to be

used as a life saving device.

Air is introduced to the duct smoke detector sensor’s

sensing chamber through a sampling tube that extends into

the HVAC duct and is directed back into the ventilation

system through a (shorter) exhaust tube. The difference in

air pressure between the two tubes pulls the sampled air

through the sensing chamber. When a sufficient amount of

smoke is detected in the sensing chamber, the sensor

signals an alarm state and the controller automatically

takes the appropriate action to shut down fans and

blowers, change over air handling systems, notify the fire

alarm control panel, etc.

Controller

The controller (see Fig. 18) includes a controller housing,

a printed circuit board, and a clear plastic cover. The

controller can be connected to one or two compatible duct

smoke sensors. The clear plastic cover is secured to the

housing with a single captive screw for easy access to the

wiring terminals. The controller has three LEDs (for

Power, Trouble and Alarm) and a manual test/reset button

(on the cover face).

The sensor uses a process called differential sensing to

prevent gradual environmental changes from triggering

false alarms. A rapid change in environmental conditions,

such as smoke from a fire, causes the sensor to signal an

alarm state but dust and debris accumulated over time

does not.

Smoke Detector Sensor

Duct smoke sensor

Exhaust tube

C08245

Fig. 20 - Typical Supply Air Smoke Detector Sensor

Location

Exhaust gasket

Sensor housing

and electronics

See

Detail A

Return Air without Economizer — The sampling tube is

located across the return air opening on the unit basepan.

(See Fig. 21.) The holes in the sampling tube face

downward, into the return air stream. The sampling tube is

connected via tubing to the return air sensor that is

mounted on a bracket high on the partition between return

filter and controller location. (This sensor is shipped in a

flat-mounting location. Installation requires that this

sensor be relocated to its operating location and the tubing

to the sampling tube be connected. See installation steps

below.)

Intake

gasket

Cover gasket

(ordering option)

TSD-CO2

(ordering option)

Sensor cover

Plug

Sampling tube

(ordered separately)

Coupling

Detail A

Return Air Detector module

(shipping position shown)*

Magnetic

test/reset

switch

Controller module

Alarm

Trouble

Power

Dirty

C08209

Fig. 19 - Smoke Detector Sensor

For installations using two sensors, the duct smoke

detector does not differentiate which sensor signals an

alarm or trouble condition.

Smoke Detector Locations

Return Air Detector Sampling Tube

Supply Air — The Supply Air smoke detector sensor is

located to the left of the unit’s indoor (supply) fan. (See

Fig. 20.) Access is through the fan access panel. There is

no sampling tube used at this location. The sampling tube

inlet extends through the side plate of the fan housing

(into a high pressure area). The controller is located on a

bracket to the right of the return filter, accessed through

the lift-off filter panel.

*RA detector must be moved from shipping position to operating position by installer

C07307

Fig. 21 - Typical Return Air Detector Location

Return Air with Economizer — The sampling tube is

inserted through the side plates of the economizer

housing, placing it across the return air opening on the

unit basepan. (See Fig. 22.) The holes in the sampling

tube face downward, into the return air stream. The

sampling tube is connected via tubing to the return air

sensor that is mounted on a bracket high on the partition

between return filter and controller location. (This sensor

is shipped in a flat-mounting location. Installation

requires that this sensor be relocated to its operating

location and the tubing to the sampling tube be connected.

See installation steps below.)

4. Screw the sensor and detector plate into its operating

position using screws from Step 1. Make sure the

sampling tube connection is on the bottom and the ex-

haust tube is on the top. (See Fig. 23.)

5. Connect the flexible tube on the sampling inlet to the

sampling tube on the basepan.

6. For units with an economizer, the sampling tube is in-

tegrated into the economizer housing but the connec-

tion of the flexible tubing to the sampling tube is the

same.

Return Air

Sampling Tube

C08129

Fig. 22 - Return Air Sampling Tube Location

Completing Installation of Return Air Smoke

Sensor:

SCREWS

C08127

Fig. 24 - Return Air Sensor Operating Position

EXHAUST

TUBE

FIOP Smoke Detector Wiring and Response

FLEXIBLE

EXTENSION

TUBE

All units: FIOP smoke detector is configured to

automatically shut down all unit operations when smoke

condition is detected. See Fig. 25, Smoke Detector

Wiring.

SAMPLING

C08126

Highlight A: JMP 3 is factory-cut, transferring unit

control to smoke detector.

Fig. 23 - Return Air Detector Shipping Position

Highlight B: Smoke detector NC contact set will open on

smoke alarm condition, de-energizing the ORN

conductor.

1. Unscrew the two screws holding the Return Air

Sensor detector plate. (See Fig. 23.) Save the screws.

2. Remove the Return Air Sensor and its detector plate.

3. Rotate the detector plate so the sensor is facing out-

wards and the sampling tube connection is on the bot-

tom. (See Fig. 24.)

C08246

Fig. 25 - Typical Smoke Detector System Wiring

Highlight C: 24-v power signal via ORN lead is removed

at Smoke Detector input on LCTB; all unit operations

cease immediately.

Sensor and Controller Tests

Sensor Alarm Test

The sensor alarm test checks a sensor’s ability to signal an

alarm state. This test requires that you use a field provided

SD-MAG test magnet.

PremierLinkt and RTU-MP Controls: Unit operating

functions (fan, cooling and heating) are terminated as

described above. In addition:

CAUTION

Highlight D: On smoke alarm condition, the smoke

detector NO Alarm contact will close, supplying 24-v

power to GRA conductor.

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

Highlight E: GRA lead at Smoke Alarm input on LCTB

provides 24-v signal to FIOP DDC control.

This test places the duct detector into the alarm state.

Unless part of the test, disconnect all auxiliary

equipment from the controller before performing the

test. If the duct detector is connected to a fire alarm

system, notify the proper authorities before

performing the test.

PremierLink: This signal is conveyed to PremierLink

FIOP’s TB1 at terminal TB1-6 (BLU lead). This signal

initiates the FSD sequence by the PremierLink control.

FSD status is reported to connected CCN network.

RTU-MP: The 24-v signal is conveyed to RTU-MP’s

J1-10 input terminal. This signal initiates the FSD

sequence by the RTU-MP control. FSD status is reported

to connected BAS network.

Sensor Alarm Test Procedure

1. Hold the test magnet where indicated on the side of

the sensor housing for seven seconds.

2. Verify that the sensor’s Alarm LED turns on.

3. Reset the sensor by holding the test magnet against

the sensor housing for two seconds.

Using Remote Logic: Five conductors are provided for

field use (see Highlight F) for additional annunciation

functions.

4. Verify that the sensor’s Alarm LED turns off.

Additional Application Data — Refer to Catalog No.

HKRNKA-1XA for discussions on additional control

features of these smoke detectors including multiple unit

coordination. (See Fig. 25.)

Controller Alarm Test

The controller alarm test checks the controller’s ability to

initiate and indicate an alarm state.

Table 2 – Dirty LED Test

CAUTION

FLASHES

DESCRIPTION

0---25% dirty. (Typical of a newly installed detector)

25---50% dirty

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

51---75% dirty

76---99% dirty

This test places the duct detector into the alarm state.

Disconnect all auxiliary equipment from the controller

before performing the test. If the duct detector is

connected to a fire alarm system, notify the proper

authorities before performing the test.

Dirty Sensor Test Procedure

1. Hold the test magnet where indicated on the side of

the sensor housing for two seconds.

2. Verify that the sensor’s Dirty LED flashes.

Controller Alarm Test Procedure

1. Press the controller’s test/reset switch for seven

seconds.

2. Verify that the controller’s Alarm LED turns on.

CAUTION

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

3. Reset the sensor by pressing the test/reset switch for

two seconds.

Changing the dirty sensor test operation will put the

detector into the alarm state and activate all automatic

alarm responses. Before changing dirty sensor test

operation, disconnect all auxiliary equipment from the

controller and notify the proper authorities if

connected to a fire alarm system.

4. Verify that the controller’s Alarm LED turns off.

Dirty Controller Test

The dirty controller test checks the controller’s ability to

initiate a dirty sensor test and indicate its results.

CAUTION

Changing the Dirty Sensor Test

By default, sensor dirty test results are indicated by:

S The sensor’s Dirty LED flashing.

S The controller’s Trouble LED flashing.

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

S The controller’s supervision relay contacts toggle.

The operation of a sensor’s dirty test can be changed so

that the controller’s supervision relay is not used to

indicate test results. When two detectors are connected to

a controller, sensor dirty test operation on both sensors

must be configured to operate in the same manner.

Pressing the controller’s test/reset switch for longer

than seven seconds will put the duct detector into the

alarm state and activate all automatic alarm responses.

Dirty Controller Test Procedure

S Press the controller’s test/reset switch for two seconds.

S Verify that the controller’s Trouble LED flashes.

Dirty Sensor Test

To Configure the Dirty Sensor Test Operation

1. Hold the test magnet where indicated on the side of

the sensor housing until the sensor’s Alarm LED turns

on and its Dirty LED flashes twice (approximately 60

seconds).

2. Reset the sensor by removing the test magnet then

holding it against the sensor housing again until the

sensor’s Alarm LED turns off (approximately 2

seconds).

The dirty sensor test provides an indication of the sensor’s

ability to compensate for gradual environmental changes.

A sensor that can no longer compensate for environmental

changes is considered 100% dirty and requires cleaning or

replacing. You must use a field provided SD-MAG test

magnet to initiate a sensor dirty test. The sensor’s Dirty

LED indicates the results of the dirty test as shown in

Table 2.

Remote Station Test

The remote station alarm test checks a test/reset station’s

ability to initiate and indicate an alarm state.

CAUTION

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

Holding the test magnet against the sensor housing for

more than seven seconds will put the duct detector

into the alarm state and activate all automatic alarm

responses.

This test places the duct detector into the alarm state.

Unless part of the test, disconnect all auxiliary

equipment from the controller before performing the

test. If the duct detector is connected to a fire alarm

system, notify the proper authorities before

performing the test.

SD-TRK4 Remote Alarm Test Procedure

Dirty Sensor Test Using an SD-TRK4

1. Turn the key switch to the RESET/TEST position for

seven seconds.

1. Turn the key switch to the RESET/TEST position for

two seconds.

2. Verify that the test/reset station’s Alarm LED turns

on.

2. Verify that the test/reset station’s Trouble LED

flashes.

3. Reset the sensor by turning the key switch to the

RESET/TEST position for two seconds.

4. Verify that the test/reset station’s Alarm LED turns

off.

Detector Cleaning

Cleaning the Smoke Detector

Clean the duct smoke sensor when the Dirty LED is

flashing continuously or sooner if conditions warrant.

Remote Test/Reset Station Dirty Sensor Test

The test/reset station dirty sensor test checks the test/reset

station’s ability to initiate a sensor dirty test and indicate

the results. It must be wired to the controller as shown in

Fig. 26 and configured to operate the controller’s

supervision relay. For more information, see “Changing

the Dirty Sensor Test.”

CAUTION

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

If the smoke detector is connected to a fire alarm

system, first notify the proper authorities that the

detector is undergoing maintenance then disable the

relevant circuit to avoid generating a false alarm.

Smoke Detector Controller

TB3

−

Auxiliary

equipment

1. Disconnect power from the duct detector then remove

the sensor’s cover. (See Fig. 27.)

HVAC duct

Sampling

tube

SD-TRK4

Trouble

Supervision relay

contacts [3]

Sensor

housing

Power

18 Vdc (

Wire must be

Alarm

Optic

plate

Airﬂow

added by installer

Reset/Test

Retainer

clip

18 Vdc (

−)

Optic

housing

C08247

Fig. 26 - Remote Test/Reset Station Connections

C07305

Fig. 27 - Sensor Cleaning Diagram

2. Using a vacuum cleaner, clean compressed air, or a

soft bristle brush, remove loose dirt and debris from

inside the sensor housing and cover.

CAUTION

OPERATIONAL TEST HAZARD

Use isopropyl alcohol and a lint-free cloth to remove

dirt and other contaminants from the gasket on the

sensor’s cover.

Failure to follow this caution may result in personnel

and authority concern.

If the test/reset station’s key switch is left in the

RESET/TEST position for longer than seven seconds,

the detector will automatically go into the alarm state

and activate all automatic alarm responses.

3. Squeeze the retainer clips on both sides of the optic

housing then lift the housing away from the printed

circuit board.

4. Gently remove dirt and debris from around the optic

plate and inside the optic housing.

5. Replace the optic housing and sensor cover.

6. Connect power to the duct detector then perform a

sensor alarm test.

CAUTION

OPERATIONAL TEST HAZARD

Failure to follow this caution may result in personnel

and authority concern.

Holding the test magnet to the target area for longer

than seven seconds will put the detector into the alarm

state and activate all automatic alarm responses.

NOTE: All troubles are latched by the duct smoke

detector. The trouble condition must be cleared and then

the duct smoke detector must be reset in order to restore it

to the normal state.

INDICATORS

Normal State

The smoke detector operates in the normal state in the

absence of any trouble conditions and when its sensing

chamber is free of smoke. In the normal state, the Power

LED on both the sensor and the controller are on and all

other LEDs are off.

Resetting Alarm and Trouble Condition Trips:

Manual reset is required to restore smoke detector systems

to Normal operation. For installations using two sensors,

the duct smoke detector does not differentiate which

sensor signals an alarm or trouble condition. Check each

sensor for Alarm or Trouble status (indicated by LED).

Clear the condition that has generated the trip at this

sensor. Then reset the sensor by pressing and holding the

reset button (on the side) for 2 seconds. Verify that the

sensor’s Alarm and Trouble LEDs are now off. At the

controller, clear its Alarm or Trouble state by pressing and

holding the manual reset button (on the front cover) for 2

seconds. Verify that the controller’s Alarm and Trouble

LEDs are now off. Replace all panels.

Alarm State

The smoke detector enters the alarm state when the

amount of smoke particulate in the sensor’s sensing

chamber exceeds the alarm threshold value. (See Table 3.)

Upon entering the alarm state:

S The sensor’s Alarm LED and the controller’s Alarm LED

turn on.

S The contacts on the controller’s two auxiliary relays

switch positions.

S The contacts on the controller’s alarm initiation relay

Troubleshooting

close.

S The controller’s remote alarm LED output is activated

(turned on).

Controller’s Trouble LED is On

1. Check the Trouble LED on each sensor connected to

the controller. If a sensor’s Trouble LED is on, de-

termine the cause and make the necessary repairs.

S The controller’s high impedance multiple fan shutdown

control line is pulled to ground Trouble state.

The SuperDuct duct smoke detector enters the trouble

state under the following conditions:

S A sensor’s cover is removed and 20 minutes pass before

2. Check the wiring between the sensor and the control-

ler. If wiring is loose or missing, repair or replace as

required.

it is properly secured.

Controller’s Trouble LED is Flashing

S A sensor’s environmental compensation limit is reached

(100% dirty).

1. One or both of the sensors is 100% dirty.

2. Determine which Dirty LED is flashing then clean

that sensor assembly as described in the detector

cleaning section.

S A wiring fault between a sensor and the controller is

detected.

An internal sensor fault is detected upon entering the

trouble state:

S The contacts on the controller’s supervisory relay switch

Sensor’s Trouble LED is On

1. Check the sensor’s Dirty LED. If it is flashing, the

sensor is dirty and must be cleaned.

2. Check the sensor’s cover. If it is loose or missing, se-

cure the cover to the sensor housing.

positions. (See Fig. 28.)

S If a sensor trouble, the sensor’s Trouble LED the

controller’s Trouble LED turn on.

3. Replace sensor assembly.

S If 100% dirty, the sensor’s Dirty LED turns on and the

controller’s Trouble LED flashes continuously.

Sensor’s Power LED is Off

1. Check the controller’s Power LED. If it is off, de-

termine why the controller does not have power and

make the necessary repairs.

S If a wiring fault between a sensor and the controller, the

controller’s Trouble LED turns on but not the sensor’s.

2. Check the wiring between the sensor and the control-

ler. If wiring is loose or missing, repair or replace as

required.

Trouble

Alarm

Power

Test/reset

switch

C07298

Fig. 28 - Controller Assembly

Table 3 – Detector Indicators

CONTROL OR INDICATOR

DESCRIPTION

Resets the sensor when it is in the alarm or trouble state. Activates or tests the sensor when it is in

the normal state.

Magnetic test/reset switch

Alarm LED

Trouble LED

Indicates the sensor is in the alarm state.

Indicates the sensor is in the trouble state.

Indicates the amount of environmental compensation used by the sensor

(flashing continuously = 100%)

Dirty LED

Power LED

Indicates the sensor is energized.

Controller’s Power LED is Off

2.9 and 3.7 bhp motors are equipped with an

overtemperature or protection device. The type of device

depends on the motor size. See Table 4.

1. Make sure the circuit supplying power to the control-

ler is operational. If not, make sure JP2 and JP3 are

set correctly on the controller before applying power.

2. Verify that power is applied to the controller’s supply

input terminals. If power is not present, replace or re-

pair wiring as required.

The High Static option supply fan motor is equipped with

a pilot-circuit Thermix combination overtemperature/

overcurrent protection device. This device resets

automatically. Do not bypass this switch to correct

trouble. Determine the cause and correct it.

Remote Test/Reset Station’s Trouble LED Does Not

flash When Performing a Dirty Test, But the

Controller’s Trouble LED Does

The Thermik device is a snap-action overtemperature

protection device that is imbedded in the motor windings.

It is a pilot-circuit device that is wired into the unit’s 24-v

control circuit. When this switch reaches its trip setpoint,

it opens the 24-v control circuit and causes all unit

operation to cease. This device resets automatically when

the motor windings cool. Do not bypass this switch to

correct trouble. Determine the cause and correct it.

1. Verify that the remote test/station is wired as shown

in Fig. 26. Repair or replace loose or missing wiring.

2. Configure the sensor dirty test to activate the control-

ler’s supervision relay. See “Changing sensor dirty

test operation.”

Sensor’s Trouble LED is On, But the Controller’s

Trouble LED is OFF

The

External

motor

overload device

specially-calibrated circuit breaker that is UL recognized

as a motor overload controller. It is an overcurrent

device. When the motor current exceeds the circuit

breaker setpoint, the device opens all motor power leads

and the motor shuts down. Reset requires a manual reset

at the overload switch. This device (designated IFCB) is

located on the side of the supply fan housing, behind the

fan access panel.

Remove JP1 on the controller.

PROTECTIVE DEVICES

Compressor Protection

Overcurrent

Each compressor has internal linebreak motor protection.

Reset is automatic after compressor motor has cooled.

Troubleshooting supply fan motor overload trips: The

supply fan used in 48TC units is a forward-curved

centrifugal wheel. At a constant wheel speed, this wheel

has a characteristic that causes the fan shaft load to

DECREASE when the static pressure in the unit-duct

system increases and to INCREASE when the static

pressure in the unit-duct system decreases (and fan

Overtemperature

Each compressor has an internal protector to protect it

against excessively high discharge gas temperatures. Reset

is automatic.

High Pressure Switch

airflow rate increases).

Motor overload conditions

Each system is provided with a high pressure switch

mounted on the discharge line. The switch is

stem-mounted and brazed into the discharge tube. Trip

setting is 630 psig +/- 10 psig (4344 +/- 69 kPa) when

hot. Reset is automatic at 505 psig (3482 kPa).

typically develop when the unit is operated with an access

panel removed, with unfinished duct work, in an

economizer-open mode, or a leak develops in the duct

system that allows a bypass back to unit return opening.

Low Pressure Switch

Table 4 - Overcurrent Device Type

Each system is protected against a loss of charge and low

evaporator coil loading condition by a low pressure switch

located on the suction line near the compressor. The

switch is stem-mounted. Trip setting is 54 psig +/- 5 psig

(372 +/- 34 kPa). Reset is automatic at 117 +/- 5 psig

(807 +/- 34 kPa).

Motor Size (bhp)

Overload Device

Internal Linebreak

Thermik

Reset

1.7

2.4

2.9

3.7

4.7

Automatic

Manual

Thermik

Supply (Indoor) Fan Motor Protection

External

(Circuit Breaker)

Disconnect and lockout power when servicing fan motor.

Condenser Fan Motor Protection

Fuel Types and Pressures

The condenser fan motor is internally protected against

overtemperature.

Natural Gas — The 48TC unit is factory-equipped for use

with Natural Gas fuel at elevation under 2000 ft (610 m).

See section Orifice Replacement for information in

modifying this unit for installation at elevations above

2000 ft (610 m).

Control Circuit, 24--V

The control circuit is protected against overcurrent

conditions by a circuit breaker mounted on control

transformer TRAN. Reset is manual.

Gas line pressure entering the unit’s main gas valve must

be within specified ranges. Adjust unit gas regulator valve

as required or consult local gas utility.

GAS HEATING SYSTEM

General

Table 5 – Natural Gas Supply Line Pressure Ranges

UNIT MODEL

UNIT SIZE

MIN

MAX

The heat exchanger system consists of a gas valve feeding

multiple inshot burners off a manifold. The burners fire

into matching primary tubes. The primary tubes discharge

into combustion plenum where gas flow converges into

secondary tubes. The secondary tubes exit into the

induced draft fan wheel inlet. The induced fan wheel

discharges into a flue passage and flue gases exit out a

flue hood on the side of the unit. The induced draft fan

motor includes a Hall Effect sensor circuit that confirms

adequate wheel speed via the Integrated Gas Control

(IGC) board. Safety switches include a Rollout Switch (at

the top of the burner compartment) and a limit switch

(mounted through the fan deck, over the tubes). (See Fig.

29 and 30.)

4.0 in. wg

(996 Pa)

13.0 in. wg

(3240 Pa)

48TC

All

Manifold pressure is factory-adjusted for NG fuel use.

Adjust as required to obtain best flame characteristic.

Table 6 – Natural Gas Manifold Pressure Ranges

UNIT

MODEL

UNIT

SIZE

HIGH

FIRE

LOW

FIRE

RANGE

3.5 in. wg 1.7 in. wg 2.0---5.0 in. wg (Hi)

(872 Pa) (423 Pa) (498---1245 Pa)

48TC

All

Liquid Propane — Accessory packages are available for

field-installation that will convert the 48TC unit to

operate with Liquid Propane (LP) fuels. These kits include

new orifice spuds, new springs for gas valves and a supply

line low pressure switch. See section on Orifice

Replacement for details on orifice size selections.

INDUCED-

DRAFT

MOTOR

MOUNTING

ROLLOUT

SWITCH

Fuel line pressure entering unit gas valve must remain

within specified range.

PLATE

FLUE

EXHAUST

BURNER

SECTION

Table 7 – Liquid Propane Supply Line Pressure Ranges

VESTIBULE

PLATE

INDUCED-

DRAFT MOTOR

UNIT MODEL

UNIT SIZE

MIN

MAX

11.0 in. wg

(2740 Pa)

13.0 in. wg

(3240 Pa)

48TC

All

MANIFOLD

PRESSURE

TAP

Manifold pressure for LP fuel use must be adjusted to

specified range. Follow instructions in the accessory kit to

make initial readjustment.

BLOWER

HOUSING

GAS

VALVE

C09153

Table 8 – Liquid Propane Manifold Pressure Ranges

Fig. 29 - Burner Section Details

UNIT MODEL

UNIT SIZE

HIGH FIRE

LOW FIRE

10.0 in. wg

(2490 Pa)

5.0 in. wg

(1245 Pa)

48TC

All

Limit Switch

and Shield

Supply Pressure Switch — The LP conversion kit includes

a supply low pressure switch. The switch contacts (from

terminal C to terminal NO) will open the gas valve power

whenever the supply line pressure drops below the

setpoint. (See Fig. 31 and 32.) If the low pressure remains

open for 15 minutes during a call for heat, the IGC circuit

will initiate a Ignition Fault (5 flashes) lockout. Reset of

the low pressure switch is automatic on rise in supply line

pressure. Reset of the IGC requires a recycle of unit

power after the low pressure switch has closed.

C08284

Fig. 30 - Limit Switch Location

This switch also prevents operation when the propane tank

level is low which can result in gas with a high

concentration of impurities, additives, and residues that

have settled to the bottom of the tank. Operation under

these conditions can cause harm to the heat exchanger

system. Contact your fuel supplier if this condition is

suspected.

Flue Gas Passageways

To inspect the flue collector box and upper areas of the

heat exchanger:

1. Remove the combustion blower wheel and motor as-

sembly according to directions in Combustion-Air

Blower section. (See Fig. 33.)

2. Remove the flue cover to inspect the heat exchanger.

3. Clean all surfaces as required using a wire brush.

C08238

48TCDD08 only

Combustion--Air Blower

Clean periodically to assure proper airflow and heating

efficiency. Inspect blower wheel every fall and

periodically during heating season. For the first heating

season, inspect blower wheel bi-monthly to determine

proper cleaning frequency.

To access burner section, slide the sliding burner partition

out of the unit.

To inspect blower wheel, shine a flashlight into draft hood

opening. If cleaning is required, remove motor and wheel

as follows:

1. Slide burner access panel out.

2. Remove the 7 screws that attach induced-draft motor

housing to vestibule plate. (See Fig. 33.)

C08239

All 48TC*D except DD08

Fig. 31 - LP Low Pressure Switch (Installed)

3. The blower wheel can be cleaned at this point. If ad-

ditional cleaning is required, continue with Steps 4

and 5.

4. To remove blower from the motor shaft, remove 2

setscrews.

LP LPS

IGC

BRN

5. To remove motor, remove the 4 screws that hold the

motor to mounting plate. Remove the motor cooling

fan by removing one setscrew. Then remove nuts that

hold motor to mounting plate.

J2-11

MGV

IGC

GRA

J2-12

6. To reinstall, reverse the procedure outlined above.

TSTAT

PNK

C08285

Fig. 32 - LP Supply Line Low Pressure Switch Wiring

HEATER TUBE

ASSEMBLY

SEAL STRIPS,

SPONGE RUBBER

REGULATOR

GASKET

REGULATOR

RETAINER

WIND CAP

ASSEMBLY

(SHOWN

INVERTED,

AS SHIPPED)

SUPPORT INSULATION ASSEMBLY

INDUCER FAN-MOTOR ASSEMBLY

BURNER ASSEMBLY

C08227

Fig. 33 - Heat Exchanger Assembly

ORIFICE

Burners and Igniters

CAUTION

1.00-in

(25.4 mm)

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in

equipment damage.

When working on gas train, do not hit or plug

orifice spuds.

MANIFOLD

PIPE

C08211

Fig. 34 - Orifice Projection

Main Burners

To access burners, remove burner access panel and slide

out burner partition. At the beginning of each heating

season, inspect for deterioration or blockage due to

corrosion or other causes. Observe the main burner flames

and adjust, if necessary.

Removal and Replacement of Gas Train

See Fig. 29, 33, and 35.

1. Shut off manual gas valve.

2. Shut off power to unit.

3. Slide out burner partition.

Orifice projection — Refer to Fig. 34 for maximum

projection dimension for orifice face to manifold tube.

4. Disconnect gas piping at unit gas valve.

5. Remove wires connected to gas valve. Mark each

wire.

MANIFOLD PRESSURE TAP

7. Reinstall burner rack as described in Removal and

Replacement of Gas Train section, above.

Gas Valve — All unit sizes are equipped with 2-stage gas

valves. See Fig. 38 for locations of adjustment screws and

features on the gas valves.

GAS

VALVE

To adjust gas valve pressure settings:

IMPORTANT: Leak check all gas connections including

the main service connection, gas valve, gas spuds, and

manifold pipe plug. All leaks must be repaired before

firing unit.

BURNERS

C09154

Fig. 35 - Burner Tray Details

Check Unit Operation and Make Necessary

Adjustments

6. Remove igniter wires and sensor wires at the Integ-

rated Gas Unit Controller (IGC). (See Fig. 36.)

7. Remove the 2 screws that attach the burner rack to

the vestibule plate. (See Fig. 33.)

8. Slide the burner tray out of the unit. (See Fig. 35.)

9. To reinstall, reverse the procedure outlined above.

Cleaning and Adjustment

NOTE: Gas supply pressure at gas valve inlet must be

within specified ranges for fuel type and unit size. (See

Table 5, 6, 7, and 8.)

1. Remove manifold pressure tap plug from manifold

and connect pressure gauge or manometer. (See Fig.

35.)

2. Turn on electrical supply.

1. Remove burner rack from unit as described in Re-

moval and Replacement of Gas Train section, above.

2. Inspect burners; if dirty, remove burners from rack.

(Mark each burner to identify its position before re-

moving from the rack.)

3. Use a soft brush to clean burners and cross-over port

as required.

4. Adjust spark gap. (See Fig. 37.)

5. If factory orifice has been removed, check that each

orifice is tight at its threads into the manifold pipe

and that orifice projection does not exceed maximum

valve. (See Fig. 34).

3. Turn on unit main gas valve.

4. Set room thermostat to call for heat. Verify high-

stage heat operation before attempting to adjust mani-

fold pressure.

5. When main burners ignite, check all fittings, mani-

fold, and orifices for leaks.

6. Adjust high-stage pressure to specified setting by

turning the plastic adjustment screw clockwise to in-

crease pressure, counter-clockwise to decrease pres-

sure.

7. Set room thermostat to call for low-stage heat. Adjust

low-stage pressure to specified setting.

6. Reinstall burners on rack in the same locations as

factory-installed. (The outside crossover flame re-

gions of the outermost burners are pinched off to pre-

vent excessive gas flow from the side of the burner

assembly. If the pinched crossovers are installed

between two burners, the flame will not ignite prop-

erly.)

8. Replace regulator cover screw(s) when finished.

9. With burner access panel removed, observe unit heat-

ing operation in both high stage and low stage opera-

tion. Observe burner flames to see if they are blue in

appearance, and that the flames are approximately the

same for each burner.

10. Turn off unit, remove pressure manometer and re-

place the 1/8 in. pipe fitting on the gas manifold. (See

Fig. 35.)

INTEGRATED GAS UNIT

RACEWAY

CONTROLLER (IGC)

Limit Switch

Remove blower access panel. Limit switch is located on

the fan deck. (See Fig. 30.)

HOLE IN END PANEL (HIDDEN)

C08454

Fig. 36 - Unit Control Box/IGC Location

125,000/90,000 BTUH INPUT

180,000/120,000 BTUH INPUT

240,000/180,000 BTUH INPUT

250,000/200,000 BTUH INPUT

C08447

Fig. 37 - Spark Adjustment (08-14)

Table 9 – LED Error Code Description*

Burner Ignition

Unit is equipped with a direct spark ignition 100% lockout

system. Integrated Gas Unit Controller (IGC) is located in

the control box. (See Fig. 36.) The IGC contains a

self-diagnostic LED (light-emitting diode). A single LED

(see Fig. 39) on the IGC provides a visual display of

operational or sequential problems when the power supply

is uninterrupted. When a break in power occurs, the IGC

will be reset (resulting in a loss of fault history) and the

indoor (evaporator) fan ON/OFF times will be reset. The

LED error code can be observed through the viewport.

During servicing refer to the label on the control box

cover or Table 9 for an explanation of LED error code

descriptions.

ERROR CODE

LED INDICATION

DESCRIPTION

Normal Operation

Hardware Failure

Limit Switch Fault

Flame Sense Fault

OFF

2 Flashes

3 Flashes

4 Flashes

5 Flashes

6 Flashes

7 Flashes

8 Flashes

9 Flashes

4 Consecutive Limit Switch Faults

Ignition Lockout Fault

Induced---Draft Motor Fault

Rollout Switch Fault

Internal Control Fault

Software Lockout

LEGEND

LED --- L ig h t E m it t in g Dio d e

If lockout occurs, unit may be reset by interrupting power

supply to unit for at least 5 seconds.

A 3 – second pause exists between LED error code flashes. If

more than one error code exists, all applicable codes will be

displayed in numerical sequence.

IMPORTANT: Refer to Troubleshooting Tables 13 and

14 for additional information.

C08240

48TCDD08 only

C08241

All 48TC*D except DD08

Fig. 38 - Gas Valve

Check that each replacement orifice is tight at its threads

into the manifold pipe and that orifice projection does not

exceed maximum value. (See Fig. 34.)

Orifice Replacement

This unit uses orifice type LH32RFnnn (where nnn

indicates orifice reference size). When replacing unit

orifices, order the necessary parts via Carrier RCD. See

Table 11 for available orifice sizes. See Table 12 for

orifice sizes for Natural Gas and LP fuel usage at various

elevations above sea level.

Red LED-Status

C08452

Fig. 39 - Integrated Gas Control (IGC) Board

Table 10 – IGC Connections

CONNECTION

PIN NUMBER

TERMINAL LABEL

POINT DESCRIPTION

SENSOR LOCATION

TYPE OF I/O

INPUTS

RT, C

Input power from TRAN 1

Speed sensor

control box

gas section

LCTB

24 VAC

—

analog input

switch input

24 VAC

J1, 1-3

—

FS, T1

Flame sensor

Heat stage 1

J2, 2

Rollout switch

gas section

fan section

—

switch input

J2, 5-6

J2, 7-8

J2, 9-10

Limit switch

Centrifugal switch (not used)

OUTPUTS

L1, CM

IFO

Induced draft combustion motor

Indoor fan

gas section

control box

gas section

line VAC

relay

J2, 1

Gas valve (heat stage 1)

relay

J2, 11-12

Table 11 – Orifice Sizes

ORIFICE

DRILL SIZE

CARRIER

PART NUMBER

DRILL

DIA. (in.)

#30

1/8

LH32RF129

LH32RF125

LH32RF120

LH32RF116

LH32RF113

LH32RF111

LH32RF110

LH32RF105

LH32RF104

LH32RF102

LH32RF103

LH32RF098

LH32RF096

LH32RF094

LH32RF089

LH32RF086

LH32RF082

LH32RF080

LH32RF079

LH32RF076

LH32RF073

LH32RF070

LH32RF067

LH32RF065

LH32RF060

LH32RF055

LH32RF052

LH32RF047

LH32RF043

LH32RF042

0.1285

0.1250

0.1200

0.1160

0.1130

0.1110

0.1100

0.1065

0.1040

0.1015

0.0995

0.0980

0.0960

0.0935

0.0890

0.0860

0.0820

0.0810

0.0785

0.0760

0.0730

0.0700

0.0670

0.0635

0.0595

0.0550

0.0520

0.0465

0.0430

0.0420

#31

#32

#33

#34

#35

#36

#37

#38

#39

#40

#41

#42

#43

#44

#45

#46

#47

#48

#49

#50

#51

#52

#53

#54

#55

#56

#57

#58

Table 12 - Altitude Compensation* (08-14)

125,000

BTUH Nominal

250,000

180,000, 224,000

BTUH Nominal

ELEVATION

NG Orifice

LP Orifice

NG Orifice

LP Orifice

NG Orifice

LP Orifice

ft (m)

Size

†30

Size

0 --- 2000 (610)

2000 (610)

3000 (914)

4000 (1219)

5000 (1524)

6000 (1829)

7000 (2134)

8000 (2438)

9000 (2743)

10000 (3048)

11000 (3353)

12000 (3658)

13000 (3962)

14000 (4267)

†41

†42

†43

†41

†42

†43

†40

LEGEND

NG = Natural Gas

LP = Liquid Propane

1 = CRLPELEV001A00

2 = CRLPELEV002A00

3 = CRLPELEV003A00

4 = CRLPELEV004A00

As the height above sea level increases, there is less oxygen

per cubic ft. of air. Therefore, heat input rate should be reduced

at higher altitudes.

{

Not included in kit. May be purchased separately through

dealer.

Thermostat

TH1

LCTB

Minimum Heating Entering Air Temperature

When operating on first stage heating, the minimum

temperature of air entering the dimpled heat exchanger is

50_F continuous and 45_F intermittent for standard heat

exchangers and 40_F continuous and 35_F intermittent for

stainless steel heat exchangers. To operate at lower

mixed-air temperatures, a field-supplied outdoor-air

thermostat must be used to initiate both stages of heat

when the temperature is below the minimum required

temperature to ensure full fire operation. Wire the

outdoor-air thermostat OALT (part no. HH22AG106) in

series with the second stage gas valve. See Fig. 40. Set the

outdoor-air thermostat at 35_F for stainless steel heat

exchangers or 45_F for standard heat exchangers. This

temperature setting will bring on the second stage of heat

whenever the ambient temperature is below the thermostat

setpoint. Indoor comfort may be compromised when

heating is initiated using low entering air temperatures

with insufficient heating temperature rise.

OALT

TH2

C08442

Fig. 40 - OATL Connections

Troubleshooting Heating System

Refer to Table 13 and 14 for additional troubleshooting

topics.

Table 13 – Heating Service Analysis

PROBLEM

CAUSE

REMEDY

Check flame ignition and sensor electrode positioning.

Adjust as needed.

Misaligned spark electrodes.

Check gas line for air, purge as necessary. After purging

gas line of air, allow gas to dissipate for at least 5 minutes

before attempting to relight unit.

No gas at main burners.

Check gas valve.

Water in gas line.

No power to furnace.

Drain water and install drip leg to trap water.

Check power supply, fuses, wiring, and circuit breaker.

Burners Will Not Ignite.

No 24 v power supply to control

circuit.

Check transformer. Transformers with internal overcurrent

protection require a cool down period before resetting.

Miswired or loose connections.

Check all wiring and wire nut connections.

Burned---out heat anticipator in

thermostat.

Replace thermostat.

Broken thermostat wires.

Dirty air filter.

Run continuity check. Replace wires, if necessary.

Clean or replace filter as necessary.

Check gas pressure at manifold. Clock gas meter for input.

If too low, increase manifold pressure, or replace with

correct orifices.

Gas input to unit too low.

Unit undersized for application.

Restricted airflow.

Replace with proper unit or add additional unit.

Clean filter, replace filter, or remove any restrictions.

Use high speed tap, increase fan speed, or install optional

blower, as suitable for individual units.

Inadequate Heating.

Blower speed too low.

Check rotation of blower, thermostat heat anticipator

settings, and temperature rise of unit. Adjust as needed.

Adjust minimum position.

Limit switch cycles main burners.

Too much outdoor air.

Check economizer operation.

Check all screws around flue outlets and burner

compartment. Tighten as necessary.

Cracked heat exchanger.

Overfired unit — reduce input, change orifices, or adjust

gas line or manifold pressure.

Check vent for restriction. Clean as necessary.

Check orifice to burner alignment.

Incomplete combustion (lack of

combustion air) results in:

Aldehyde odors, CO, sooting

flame, or floating flame.

Poor Flame

Characteristics.

Burners Will Not Turn

Off.

Unit is locked into Heating mode

for a one minute minimum.

Wait until mandatory one---minute time period has elapsed

or reset power to unit.

Table 14 – IGC Board LED Alarm Codes

LED

FLASH

CODE

ACTION TAKEN BY

RESET METHOD

CONTROL

DESCRIPTION

PROBABLE CAUSE

Normal Operation

—

Loss of power to the IGC. Check 5 amp

fuse on IGC, power to unit, 24V circuit

breaker, transformer, and wiring to the

IGC.

Off

Hardware Failure

Limit Switch Fault

No gas heating.

—

High temperature limit switch is open.

Check the operation of the indoor

(evaporator) fan motor.

Ensure that the supply-air temperature

rise is within the range on the unit

nameplate. Check wiring and limit switch

operation.

Gas valve and igniter

Off.

Indoor fan and inducer

On.

Limit switch closed,

or heat call (W) Off.

Flashes

Flame sense normal. The IGC sensed a flame when the gas

Power reset for LED valve should be closed. Check wiring,

Indoor fan and inducer

On.

Flame Sense Fault

Flashes

reset.

flame sensor, and gas valve operation.

Heat call (W) Off.

Power reset for LED

reset.

Four Consecutive Limit

4 consecutive limit switch faults within a

single call for heat. See Limit Switch Fault.

No gas heating.

Flashes Switch Fault

Unit unsuccessfully attempted ignition for

15 minutes. Check igniter and flame

sensor electrode spacing, gaps, etc.

Check flame sense and igniter wiring.

Check gas valve operation and gas

supply.

Heat call (W) Off.

Power reset for LED

reset.

Ignition Fault

Flashes

No gas heating.

Inducer sense On when heat call Off, or

inducer sense Off when heat call On.

Check wiring, voltage, and operation of

IGC motor. Check speed sensor wiring to

IGC.

If heat off: no gas

heating.

If heat on: gas valve

Off and inducer On.

Inducer sense

normal, or heat call

(W) Off.

Induced Draft Motor

Flashes Fault

Gas valve and igniter

Rollout switch has opened. Check gas

valve operation. Check induced-draft

blower wheel is properly secured to motor

shaft.

Off.

Rollout Switch Lockout

Power reset.

Indoor fan and inducer

On.

Flashes

IGC has sensed internal hardware or

software error. If fault is not cleared by

resetting 24 v power, replace the IGC.

Check gas valve connections to IGC

terminals. BRN lead must be on Pin 11.

Internal Control Lockout No gas heating.

Flashes

Temporary Software

1 hour auto reset, or Electrical interference is disrupting the

power reset. IGC software.

No gas heating.

Flashes Lockout

LEGEND

IGC --- Integrated Gas Unit Control

LED --- L ig h t --- E m it t in g D i o d e

NOTES:

1. There is a 3---second pause between alarm code displays.

2. If more than one alarm code exists, all applicable alarm codes will be displayed in numerical sequence.

3. Alarm codes on the IGC will be lost if power to the unit is interrupted.

The repair procedure requires the use of MAPP gas and

torch (must be supplied by servicer) instead of

conventional oxyacetylene fuel and torch. While the

flame temperature for MAPP is lower than that of

oxyacetylene (and thus provides more flexibility when

working on aluminum), the flame temperature is still

higher than the melting temperature of aluminum, so user

caution is required. Follow instructions carefully. Use the

heat shield.

CONDENSER COIL SERVICE

Condenser Coil

The condenser coil is new NOVATION Heat Exchanger

Technology. This is an all-aluminum construction with

louvered fins over single-depth crosstubes. The crosstubes

have multiple small passages through which the

refrigerant passes from header to header on each end.

Tubes and fins are both aluminum construction.

Connection tube joints are copper. The coil may be

one-row or two-row. Two-row coils are spaced apart to

assist in cleaning.

Replacing NOVATION Condenser Coil

The service replacement coil is preformed and is equipped

with transition joints with copper stub tubes. When

brazing the connection joints to the unit tubing, use a wet

cloth around the aluminum tube at the transition joint.

Avoid applying torch flame directly onto the aluminum

tubing.

Repairing NOVATION Condenser Tube Leaks

RCD offers service repair kit Part Number 50TJ660007

for repairing tube leaks in the NOVATION coil crosstubes.

This kit includes approved braze materials (aluminum flux

core braze rods), a heat shield, a stainless steel brush,

replacement fin segments, adhesive for replacing fin

segments, and instructions specific to the NOVATION

aluminum coil. See EPIC for instruction sheet

99TA526379.

C08199

Fig. 41 - PremierLinkt Controller

NOTE: PremierLink controller is shipped in Sensor

mode. To be used with a thermostat, the PremierLink

controller must be configured to Thermostat mode. Refer

to PremierLink Configuration instructions for Operating

Mode.

PREMIERLINKt CONTROL

The PremierLink controller (see Fig. 41) is compatible

with Carrier Comfort Networkr (CCN) devices. This

control is designed to allow users the access and ability to

change factory-defined settings, thus expanding the

function of the standard unit control board. CCN service

access tools include System Pilot (TM), Touch Pilot (TM)

and Service Tool. (Standard tier display tools Navigatort

and Scrolling Marquee are not suitable for use with latest

PremierLink controller (Version 2.x).)

Supply Air Temperature (SAT) Sensor

—

FIOP-equipped 48TC unit, the unit is supplied with a

supply-air temperature (SAT) sensor (33ZCSENSAT).

This sensor is a tubular probe type, approx. 6-inches (12.7

mm) in length. It is a nominal 10-k ohm thermistor. See

Table 15 for temperature-resistance characteristic.

The PremierLink control is factory-mounted in the 48TC

unit’s main control box to the left of the LCTB. Factory

wiring is completed through harnesses connected to the

LCTB thermostat. Field connections are made at a

16-pole terminal block (TB1) located on the bottom shelf

of the unit control box in front of the PremierLink

controller The factory-installed PremierLink control

includes the supply-air temperature (SAT) sensor. The

outdoor air temperature (OAT) sensor is included in the

FIOP/accessory EconoMi$er 2 package.

The SAT is factory-wired. The SAT probe is wire-tied to

the supply-air opening (on the horizontal opening end) in

its shipping position. Remove the sensor for installation.

Re-position the sensor in the flange of the supply-air

opening or in the supply air duct (as required by local

codes). Drill or punch a 1/2-in. hole in the flange or duct.

Use two field-supplied, self-drilling screws to secure the

sensor probe in a horizontal orientation. (See Fig. 42.)

Refer to Fig. 41 for PremierLink connection locations.

NOTE: Refer to the Rooftop PremierLink Installation,

Start-Up, and Configuration Instructions (Form

33CS-58SI) for complete PremierLink configuration,

operating sequences and troubleshooting information.

Have a copy of this manual available at unit start-up.

The PremierLink controller requires the use of a Carrier

electronic thermostat or a CCN connection for time

broadcast to initiate its internal timeclock. This is

necessary for broadcast of time of day functions

(occupied/unoccupied).

ROOF

CURB

SUPPLY AIR

TEMPERATURE

SENSOR

SUPPLY AIR

RETURN AIR

C08200

Fig. 42 - Typical Mounting Location for Supply Air

Temperature (SAT) Sensor on Small Rooftop Units

Table 15 – Thermistor Resistance vs Temperature

Values for Space Temperature Sensor, Supply Air

Temperature Sensor, and Outdoor Air Temperature

Sensor

Field connections — Field connections for accessory

sensor and input devices are made at the 16-pole terminal

block (TB1) located on the control box bottom shelf in

front of the PremierLink control. Some input devices also

require a 24-vac signal source; connect at LCTB terminal

R at “THERMOSTAT” connection strip for this signal

source. See connections figures on following pages for

field connection locations (and for continued connections

at the PremierLink board inputs).

TEMP

(C)

TEMP

(F)

RESISTANCE

(Ohms)

--- 40

--- 35

--- 30

--- 25

--- 20

--- 15

--- 10

--- 5

--- 40

--- 31

--- 22

--- 13

--- 4

335,651

242,195

176,683

130,243

96,974

72,895

55,298

42,315

32,651

25,395

19,903

15,714

12,494

10,000

8,056

Table 17 provides a summary of field connections for

units equipped with Space Sensor. Table 18 provides a

summary of field connections for units equipped with

Space Thermostat.

Space Sensors

—

The PremierLink controller is

factory-shipped configured for Space Sensor Mode. A

Carrier T-55 or T-56 space sensor must be used. T-55

space temperature sensor provides a signal of space

temperature to the PremierLink control T-56 provides

same space temperature signal plus it allows for

adjustment of space temperature setpoints from the face of

the sensor by the occupants. See Table 15 for temperature

versus resistance characteristic on the space sensors.

6,530

Connect T-55 — See Fig. 44 for typical T-55 internal

connections. Connect the T-55 SEN terminals to TB1

terminals 1 and 3 (see Fig. 45).

104

113

122

131

140

149

158

5,325

4,367

3,601

2,985

2,487

2,082

1,752

NOTE: The sensor must be mounted in the discharge

airstream downstream of the cooling coil and any heating

devices. Be sure the probe tip does not come in contact

with any of the unit’s heater surfaces.

RED(+)

WHT(GND)

CCN COM

BLK(-)

SEN

SW1

BRN (GND)

BLU (SPT)

SENSOR WIRING

Outdoor Air Temperature (OAT) Sensor — The OAT is

factory-mounted in the EconoMi$er

(FIOP or

accessory). It is a nominal 10k ohm thermistor attached to

an eyelet mounting ring. See Table 15 for

temperature-resistance characteristic.

EconoMi$er 2 — The PremierLink control is used with

EconoMi$er 2 (option or accessory) for outdoor air

management. The damper position is controlled directly

by the PremierLink control; EconoMi$er 2 has no internal

logic device.

C08201

Fig. 44 - T-55 Space Temperature Sensor Wiring

Outdoor air management functions can be enhanced with

field-installation of these accessory control devices:

TB1

SEN

J6-7

Enthalpy control (outdoor air or differential sensors)

Space CO₂sensor

Outdoor air CO₂sensor

J6-6

C08212

Refer to Table 16 for accessory part numbers.

Fig. 45 - PremierLink T-55 Sensor

Table 16 – PremierLink Sensor Usage

OUTDOOR AIR

TEMPERATURE

SENSOR

RETURN AIR

TEMPERATURE

SENSOR

OUTDOOR AIR

ENTHALPY SENSOR

RETURN AIR

ENTHALPY SENSOR

APPLICATION

Differential Dry Bulb

Temperature with

PremierLink

(PremierLink requires

4---20 mA Actuator)

Single Enthalpy with

PremierLink

(PremierLink requires

4 --- 20m A A ctuator)

Differential Enthalpy

with PremierLink

(PremierLink requires

4 --- 20m A A ctuator)

R eq uired ---

33ZCT55SPT

or equivalent

I ncluded ---

---

CRTEMPSN001A00

R eq uires ---

HH57AC077

or equivalent

I ncluded ---

Not Used

---

R eq uires ---

HH57AC077

or equivalent

Requires ---

HH57AC078

or equivalent

I ncluded ---

Not Used

NOTES:

CO Sensors (Optional):

33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.

33ZCASPCO2 --- Aspirator box used for duct---mounted CO room sensor.

33ZCT55CO2 --- Space temperature and CO room sensor with override.

33ZCT56CO2 --- Space temperature and CO room sensor with override and setpoint.

Table 17 – Space Sensor Mode

TB1 TERMINAL

FIELD CONNECTION

T55---SEN/T56---SEN

RMTOCC

T55---SEN/T56---SEN

CMPSAFE

INPUT SIGNAL

Analog (10k thermistor)

Discrete, 24VAC

Analog (10k thermistor)

Discrete, 24VAC

Analog (10k thermistor)

Discrete, 24VAC

Analog, 24VDC

T56---SET

FSD

LOOP---PWR

SPS

IAQ---SEN

FILTER

Discrete, 24VAC

Analog, 4---20mA

Discrete, 24VAC

Analog, 4---20mA

Digital, , 5VDC

Analog, 4---20mA

Digital, 5VDC

I A Q --- CO M /O A Q --- CO M /R H --- CO M

CCN + (RED)

O A Q --- S E N /R H --- S E N

CCN Gnd (WHT)

AUX OUT(Power Exhaust)

CCN --- (BLK)

(Output)Discrete 24VAC

Digital, 5VDC

LEGEND:

T55

--- Space Temperature Sensor

F S D

IAQ

--- F ir e S h u t d o w n

--- Indoor Air Quality (CO )

T56

CCN

--- Carrier Comfort Network (communication bus)

OAQ

--- Outdoor Air Quality (CO )

CMPSAFE

FILTER

--- Compressor Safety

--- Dirty Filter Switch

SFS

--- Relative Humidity

--- Supply Fan Status

Table 18 – Thermostat Mode

TB1 TERMINAL

FIELD CONNECTION

INPUT SIGNAL

Analog (10k thermistor)

Discrete, 24VAC

RAT SEN

Analog (10k thermistor)

Discrete, 24VAC

LOOP---PWR

I A Q --- S E N

Discrete, 24VAC

Analog, 24VDC

Discrete, 24VAC

A nalog, 4 --- 20m A

Discrete, 24VAC

A nalog, 4 --- 20m A

Digital, 5VDC

I A Q --- CO M /O A Q --- CO M /R H --- CO M

CCN + (RED)

O A Q --- S E N /R H --- S E N

CCN Gnd (WHT)

AUX OUT (Power Exhaust)

CCN --- (BLK)

A nalog, 4 --- 20m A

Digital, 5VDC

(Output) Discrete 24VAC

Digital, 5VDC

LEGEND:

CCN

---

Carrier Comfort Network (communication bus)

T h e r m o st a t Fa n

---

Relative Humidity

Thermostat Heat Stage 1

Thermostat Heat Stage 2

Thermostat Cool Stage 1

Thermostat Cool Stage 2

IAQ

OAQ

RAT

Indoor Air Quality (CO )

Outdoor Air Quality (CO )

Return Air Temperature

Connect T-56 — See Fig. 46 for T-56 internal

connections. Install a jumper between SEN and SET

terminals as illustrated. Connect T-56 terminals to TB1

terminals 1, 3, and 5 (see Fig. 47).

Connect Thermostat — A 7-wire thermostat connection

requires a 24-v power source and a common connection.

Use the R and C terminals on the LCTB’s THERMOSTAT

connection strip for these. Connect the thermostat’s Y1,

Y2, W1, W2 and G terminals to PremierLink TB1 as

shown in Fig. 48.

LCTB

SPACE

THERMOSTAT

RED(+)

TB1

WHT(GND)

CCN COM

BLK(-)

J4-12

SET

SEN

SW1

BLK

(T56)

BRN (GND)

BLU (SPT)

SENSOR WIRING

J4-10

J4-8

J4-6

JUMPER

TERMINALS

AS SHOWN

J4-4

LCTB

THERMOSTAT

Cool

Warm

C08202

C08119

Fig. 46 - T-56 Internal Connections

Fig. 48 - Space Thermostat Connections

TB1

If the 48TC unit has an economizer system and

free-cooling operation is required, a sensor representing

Return Air Temperature must also be connected

(field-supplied and installed). This sensor may be a T-55

Space Sensor (see Fig. 44) installed in the space or in the

return duct, or it may be sensor PNO 33ZCSENSAT,

installed in the return duct. Connect this sensor to TB1-1

and TB1-3 per Fig. 45. Temperature-resistance

characteristic is found in Table 15.

SEN

J6-7

TB1

J6-6

Jumper

SET

J6-5

C08213

Fig. 47 - PremierLink T-56 Sensor

Configure the unit for Thermostat Mode — Connect to the

CCN bus using a CCN service tool and navigate to

PremierLink Configuration screen for Operating Mode.

Default setting is Sensor Mode (value 1). Change the

value to 0 to reconfigure the controller for Thermostat

Mode.

Return Air Enthalpy Sensor — Mount the return-air

enthalpy sensor (HH57AC078) in the return-air duct. The

return air sensor is wired to the enthalpy controller

(HH57AC077). See Fig. 50.

ENTHALPY CONTROLLER

(OUTDOOR

AIR

ENTHALPY

SENSOR)

RED

BRN

When the PremierLink is configured for Thermostat

Mode, these functions are not available: Fire Shutdown

(FSD), Remote Occupied (RMTOCC), Compressor Safety

(CMPSAFE), Supply Fan Status (SFS), and Filter Pressure

Switch (FILTER).

TR1

BLK

RED

(RETURN AIR

ENTHALPY

SENSOR)

GRAY/ORN

GRAY/RED

Economizer controls —

WIRE HARNESS

IN UNIT

LED

Outdoor Air Enthalpy Control (PNO HH57AC077) -

NOTES:

1. Remove factory-installed jumper across SR and + before connecting

wires from return air sensor.

2. Switches shown in high outdoor air enthalpy state. Terminals 2 and 3

close on low outdoor air enthalpy relative to indoor air enthalpy.

3. Remove sensor mounted on back of control and locate in outside air-

stream.

The enthalpy control (HH57AC077) is available as a

field-installed accessory to be used with the EconoMi$er2

damper system. The outdoor air enthalpy sensor is part of

the enthalpy control. (The separate field-installed

accessory return air enthalpy sensor (HH57AC078) is

required for differential enthalpy control. See Fig. 50.)

C06019

Fig. 50 - Outside and Return Air Enthalpy Sensor

Wiring

Locate the enthalpy control in the economizer hood.

Locate two GRA leads in the factory harness and connect

these leads to enthalpy control sensors 2 and 3. See Fig.

49. Connect the enthalpy control power input terminals to

economizer actuator power leads RED (connect to TR)

and BLK (connect to TR1).

To wire the return air enthalpy sensor, perform the

following:

1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable

to connect the return air enthalpy sensor to the

enthalpy controller.

2. At the enthalpy control remove the factory-installed

resistor from the (SR) and (+) terminals.

LCTB

ECON

Enthalpy

Switch

3. Connect the field-supplied RED wire to (+) spade

connector on the return air enthalpy sensor and the

(SR+) terminal on the enthalpy controller. Connect

the BLK wire to (S) spade connector on the return air

enthalpy sensor and the (SR) terminal on the enthalpy

controller.

GRA

NOTE: The enthalpy control must be set to the “D”

setting for differential enthalpy control to work properly.

Factory Wiring Harness

C08218

The enthalpy control receives the indoor and return

enthalpy from the outdoor and return air enthalpy sensors

Fig. 49 - Enthalpy Switch (HH57AC077) Connections

and provides

dry contact switch input to the

The outdoor enthalpy changeover setpoint is set at the

enthalpy controller.

PremierLink controller. A closed contact indicates that

outside air is preferred to the return air. An open contact

indicates that the economizer should remain at minimum

position.

The enthalpy control receives the outdoor air enthalpy

from the outdoor air enthalpy sensor and provides a dry

contact switch input to the PremierLink controller. A

closed contact indicates that outside air is preferred to the

return air. An open contact indicates that the economizer

should remain at minimum position.

Indoor Air Quality (CO₂sensor) — The indoor air quality

sensor accessory monitors space carbon dioxide (CO₂)

levels. This information is used to monitor IAQ levels.

Several types of sensors are available, for wall mounting

in the space or in return duct, with and without LCD

display, and in combination with space temperature

sensors. Sensors use infrared technology to measure the

levels of CO₂present in the space air.

Differential Enthalpy Control — Differential enthalpy

control is provided by sensing and comparing the outside

air and return air enthalpy conditions. Install the outdoor

air enthalpy control as described above. Add and install a

return air enthalpy sensor.

The CO₂sensors are all factory set for a range of 0 to

2000 ppm and a linear mA output of 4 to 20. Refer to the

instructions supplied with the CO₂sensor for electrical

requirements and terminal locations. See Fig. 51 for

typical CO₂sensor wiring schematic.

C09155

Fig. 52 - Indoor CO₂Sensor (33ZCSENCO2)

Connections

Refer to the Rooftop PremierLink Installation, Start-Up,

and Configuration Instructions (Form 33CS-58SI),

PremierLink Installation, Start-up, and Configuration

Instructions, for detailed configuration information

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus

weatherproof enclosure) — The outdoor air CO₂sensor is

designed to monitor carbon dioxide (CO₂) levels in the

outside ventilation air and interface with the ventilation

damper in an HVAC system. The OAQ sensor is packaged

with an outdoor cover. See Fig. 53. The outdoor air CO₂

sensor must be located in the economizer outside air hood.

C07134

Fig. 51 - Indoor/Outdoor Air Quality (CO₂) Sensor

(33ZCSENCO2) - Typical Wiring Diagram

To accurately monitor the quality of the air in the

conditioned air space, locate the sensor near a return-air

grille (if present) so it senses the concentration of CO₂

leaving the space. The sensor should be mounted in a

location to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources.

Allow at least 3 ft (0.9 m) between the sensor and any

corner. Avoid mounting the sensor where it is influenced

by the supply air; the sensor gives inaccurate readings if

the supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room air

before it is drawn into the return airstream.

COVER REMOVED

SIDE VIEW

C07135

Fig. 53 - Outdoor Air Quality Sensor Cover

Wiring the Outdoor Air CO₂Sensor — A dedicated power

supply is required for this sensor. A two-wire cable is

required to wire the dedicated power supply for the sensor.

The two wires should be connected to the power supply

and terminals 1 and 2.

Wiring the Indoor Air Quality Sensor —

For each sensor, use two 2-conductor 18 AWG (American

Wire Gage) twisted-pair cables (unshielded) to connect

the separate isolated 24 vac power source to the sensor

and to connect the sensor to the control board terminals.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

OAQ sensor. See Fig. 51. Connect the 4 to 20 mA

terminal to 48TC’s terminal TB1-13. Connect the SIG

COM terminal to 48TC’s terminal TB1-11. See Fig. 54.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

sensor. See Fig. 51. Connect the 4-20 mA terminal to

terminal TB1-9 and connect the SIG COM terminal to

terminal TB1-11. See Fig. 52.

OAQ Sensor/RH Sensor

TB1

J5-2

SEN

TB1

COM

J5-3

24 VAC

C08275

Fig. 54 - Outdoor CO₂Sensor Connections

Refer to the Rooftop PremierLink Installation, Start-Up,

and Configuration Instructions (Form 33CS-58SI),

PremierLink Installation, Start-up, and Configuration

Instructions, for detailed configuration information.

Supply Fan Status Switch — The PremierLink control can

monitor supply fan operation through

field-supplied/installed differential pressure switch. This

sequence will prevent (or interrupt) operation of unit

cooling, heating and economizer functions until the

pressure switch contacts are closed indicating proper

supply fan operation.

Smoke Detector/Fire Shutdown (FSD) — This function is

available only when PremierLink is configured for

(Space) Sensor Mode. The unit is factory-wired for

PremierLink FSD operation when PremierLink is

factory-installed.

Install the differential pressure switch in the supply fan

section according to switch manufacturer’s instructions.

Arrange the switch contact to be open on no flow and to

close as pressure rises indicating fan operation.

On 48TC units equipped with factory-installed Smoke

Detector(s), the smoke detector controller implements the

unit shutdown through its NC contact set connected to the

unit’s LCTB input. The FSD function is initiated via the

smoke detector’s Alarm NO contact set. The PremierLink

communicates the smoke detector’s tripped status to the

CCN building control. See Fig. 25 for unit smoke detector

wiring.

Connect one side of the switch’s NO contact set to

LCTB’s THERMOSTAT-R terminal. Connect the other

side of the NO contact set to TB1-8. Setpoint for Supply

Fan Status is set at the switch. See Fig. 56.

Fan (Pressure) Switch (NO, close on rise in pressure)

LCTB

Thermostat

Alarm state is reset when the smoke detector alarm

condition is cleared and reset at the smoke detector in the

unit.

TB1

J4-6

Filter Status Switch — This function is available only

when PremierLink is configured for (Space) Sensor Mode.

C08118

Fig. 56 - PremierLink Wiring Fan Pressure Switch

Connection

PremierLink control can monitor return filter status in two

ways: By monitoring a field-supplied/installed filter

pressure switch or via supply fan runtime hours.

Remote Occupied Switch — The PremierLink control

permits a remote timeclock to override the control’s

on-board occupancy schedule and place the unit into

Occupied mode. This function may also provide a “Door

Switch” time delay function that will terminate cooling

and heating functions after a 2-20 minute delay.

Using switch input: Install the dirty filter pressure switch

according to switch manufacturer’s instructions, to

measure pressure drop across the unit’s return filters.

Connect one side of the switch’s NO contact set to

LCTB’s THERMOSTAT-R terminal. Connect the other

side of the NO contact set to TB1-10. Setpoint for Dirty

Filter is set at the switch. See Fig. 55.

Connect one side of the NO contact set on the timeclock

to LCTB’s THERMOSTAT-R terminal. Connect the other

side of the timeclock contact to the unit’s TB1-2 terminal.

See Fig. 57.

Filter Switch (NO, close on rising pressure (high drop))

LCTB

Thermostat

LCTB

Remote Occupied

Thermostat

TB1

J4-4

Time Clock

TB1

J4-12

C08216

C08214

Fig. 55 - PremierLink Filter Switch Connection

Fig. 57 - PremierLink Wiring Remote Occupied

When the filter switch’s NO contact set closes as filter

pressure drop increases (indicating dirt-laden filters), the

input signal to PremierLink causes the filter status point to

read “DIRTY”.

Refer to the Rooftop PremierLink Installation, Start-Up,

and Configuration Instructions (Form 33CS-58SI) for

additional information on configuring the PremierLink

control for Door Switch timer function.

Using Filter Timer Hours: Refer to the Rooftop

PremierLink Installation, Start-Up, and Configuration

Instructions (Form 33CS-58SI) for instructions on using

the PremierLink Configuration screens and on unit alarm

sequence.

Power Exhaust (output) - Connect the accessory Power

Exhaust contactor coils(s) per Fig. 58.

RTU-MP CONTROL SYSTEM

Connecting CCN bus:

Power Exhaust

PEC

TB1

LCTB

THERMOSTAT

J8-3

NOTE: When connecting the communication bus cable,

TAN

color code system for the entire network is

recommended to simplify installation and checkout. See

Table 20 for the recommended color code.

GRA

Table 20 – Color Code Recommendations

C08120

Fig. 58 - PremierLinkt Power Exhaust Output

CCN BUS WIRE

COLOR

CCN PLUG PIN

NUMBER

SIGNAL TYPE

Connection

Ground

---

Red

White

Black

Space Relative Humidity Sensor — The RH sensor is not

used with 48TC models at this time.

CCN Communication Bus — The PremierLink controller

connects to the bus in a daisy chain arrangement.

Negative pins on each component must be connected to

respective negative pins, and likewise, positive pins on

each component must be connected to respective positive

pins. The controller signal pins must be wired to the signal

ground pins. Wiring connections for CCN must be made

at the 3-pin plug.

Connect the CCN (+) lead (typically RED) to the unit’s

TB1-12 terminal. Connect the CCN (ground) lead

(typically WHT) to the unit’s TB1-14 terminal. Connect

the CCN (-) lead (typically BLK) to the unit’s TB1-16

terminal. See Fig. 59.

CCN Bus

TB1

J2-1

+ (RED)

At any baud (9600, 19200, 38400 baud), the number of

controllers is limited to 239 devices maximum. Bus length

may not exceed 4000 ft (1219m), with no more than 60

total devices on any 1000-ft (305m) section. Optically

isolated RS-485 repeaters are required every 1000 ft

(305m).

TB1

GND (WHT)

J2-2

TB1

– (BLK)

J2-3

C08276

NOTE: Carrier device default is 9600 baud.

Fig. 59 - PremierLink CCN Bus Connections

COMMUNICATION BUS WIRE SPECIFICATIONS —

The CCN Communication Bus wiring is field-supplied

and field-installed. It consists of shielded 3-conductor

cable with drain (ground) wire. The cable selected must

be identical to the CCN Communication Bus wire used for

the entire network.

The RTU-MP controller, see Fig. 60, provides expanded

stand-alone operation of the HVAC system plus

connection and control through communication with

several Building Automation Systems (BAS) through

popular third-party network systems. The available

network systems are BACnet MP/TP, Modbus and

Johnson J2. Communication with LonWorks is also

possible by adding an accessory interface card to the

RTU-MP. Selection of the communication protocol and

baud rate are made at on-board DIP switches.

See Table 19 for recommended cable.

Table 19 – Recommended Cables

MANUFACTURER

Alpha

CABLE PART NO.

2413 or 5463

A22503

American

Belden

8772

Columbia

02525

Carrier’s diagnostic display tools BACviewer6 Handheld

and Virtual BACview (loaded on a portable PC) must be

used with the RTU-MP controller. Connection to the

RTU-MP board is at the J12 access port, see Fig. 60.

NOTE: Conductors and drain wire must be at least 20

AWG, stranded, and tinned copper. Individual conductors

must be insulated with PVC, PVC/nylon, vinyl, Teflon, or

polyethylene. An aluminum/polyester 100% foil shield

and an outer jacket of PVC, PVC/nylon, chrome vinyl, or

Teflon with a minimum operating temperature range of

-20 C to 60 C is required. Do not run communication wire

in the same conduit as or next to any AC voltage wiring.

The RTU-MP control is factory-mounted in the 48TC

unit’s main control box, to the left of the LCTB. See Fig.

61. Factory wiring is completed through harnesses

connected to the LCTB. Field connections for RTU-MP

sensors will be made at the Phoenix connectors on the

RTU-MP board. The factory-installed RTU-MP control

includes the supply-air temperature (SAT) sensor. The

outdoor air temperature (OAT) sensor is included in the

FIOP/accessory EconoMi$er 2 package.

The communication bus shields must be tied together at

each system element. If the communication bus is entirely

within one building, the resulting continuous shield must

be connected to ground at only one single point. If the

communication bus cable exits from one building and

enters another building, the shields must be connected to

the grounds at a lightning suppressor in each building (one

point only).

Refer to Table 21, RTU-MP Controller Inputs and

Outputs, for locations of all connections to the RTU-MP

board.

C07129

Fig. 60 - RTU-MP Multi-Protocol Control Board

Table 21 – RTU-MP Controller Inputs and Outputs

BACnet OBJECT

TYPE OF I/O

NAME

CONNECTION PIN

NUMBERS

POINT NAME

INPUTS

Space Temperature Sensor

Supply Air Temperature

Local Outside Air Temperature Sensor

Space Temperature Offset Pot

Indoor Air Quality

Outdoor Air Quality

Safety Chain Feedback

Compressor Safety

sptsens

sat

oatsens

sptopot

iaq

oaq

safety

compstat

firedown

enthalpy

humstat

AI (10K Thermistor)

AI (100K Potentiometer)

A I (4 --- 20 m a)

J 20 --- 1, 2

J 2 --- 1, 2

J 2 --- 3, 4

J 20 --- 3

J 4 --- 2, 3

J 4 --- 5, 6

J 1 --- 9

A I (4 --- 20 m a)

DI (24 VAC)

J 1 --- 2

Fire Shutdown

Enthalpy Switch

Humidistat Input Status

J 1 --- 10

J 2 --- 6, 7

J 5 --- 7, 8

CONFIGURABLE INPUTS*

Space Relative Humidity

Outside Air Relative Humidity

Supply Fan Status

Filter Status

Remote Occupancy Input

sprh

oarh

fanstat

filtstat

remocc

OUTPUTS

econocmd

A I (4 --- 20 m a)

DI (24 VAC)

J4---2,3 or J4---5,6

J 5 --- 1, 2 or J 5 --- 3, 4 or

J5 5,6 or J5---7,8

Economizer Commanded Position

Supply Fan Relay State

4 --- 20m a

J 2 --- 5

J 1 --- 4

J 1 --- 8

J 1 --- 7

J 1 --- 6

J 1 --- 5

J 11 --- 3

J 11 --- 7, 8

DO Relay (24VAC , 1A)

DO Relay (24VAC, 1A)

Compressor 1 Relay State

Compressor 2 Relay State

Heat Stage 1 Relay State

Heat Stage 2 Relay State

Power Exhaust Relay State

Dehumidification Relay State

comp_1

comp_2

heat_1

heat_2

aux_2

humizer

LEGEND

AI --- A n a lo g In p u t

AO --- A n a lo g O u t p u t

DI --- D iscr e t e In p u t

DO --- Discrete Output

These inputs (if installed) take the place of the default input on the specific channel according to schematic.

Pa r a lle l p in s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0 , J 5 --- 5 = J 1 --- 2 a r e u se d f o r f ie ld --- in st a lla t io n .

Refer to the input configuration and accessory sections for more detail.

NOTE: Refer to RTU-MP Controls, Start-Up, Operation,

and Troubleshooting Instructions (Form 48-50H-T-2T)

for complete configuration of RTU-MP, operating

sequences and troubleshooting information. Refer to

RTU-MP 3rd Party Integration Guide for details on

configuration and troubleshooting of connected networks.

Have a copy of these manuals available at unit start-up.

The SAT is factory-wired. The SAT probe is wire-tied to

the supply-air opening (on the horizontal opening end) in

its shipping position. Remove the sensor for installation.

Re-position the sensor in the flange of the supply-air

opening or in the supply air duct (as required by local

codes). Drill or punch a 1/2-in. hole in the flange or duct.

Use two field-supplied, self-drilling screws to secure the

sensor probe in a horizontal orientation. See Fig. 42.

The RTU-MP controller requires the use of a Carrier

space sensor. A standard thermostat cannot be used with

the RTU-MP system.

Outdoor Air Temperature (OAT) Sensor — The OAT is

factory-mounted in the EconoMi$er

(FIOP or

accessory). It is a nominal 10k ohm thermistor attached to

an eyelet mounting ring. See Table 15 for

temperature-resistance characteristic.

Supply Air Temperature (SAT) Sensor

—

FIOP-equipped 48TC unit, the unit is supplied with a

supply-air temperature (SAT) sensor (33ZCSENSAT).

This sensor is a tubular probe type, approx 6-inches (12.7

mm) in length. It is a nominal 10-k ohm thermistor. See

Table 15 for temperature-resistance characteristic.

EconoMi$er 2 — The RTU-MP control is used with

EconoMi$er2 (option or accessory) for outdoor air

management. The damper position is controlled directly

by the RTU-MP control; EconoMi$er 2 has no internal

logic device.

Outdoor air management functions can be enhanced with

field-installation of these accessory control devices:

SEN

J20-1

J20-2

Enthalpy control (outdoor air or differential sensors)

Space CO₂sensor

Outdoor air CO₂sensor

Jumper

SET

Field Connections - Field connections for accessory

sensors and input devices are made the RTU-MP, at plugs

J1, J2, J4, J5, J11 and J20. All field control wiring that

connects to the RTU-MP must be routed through the

raceway built into the corner post as shown in Fig. 36.

The raceway provides the UL required clearance between

high- and low-voltage wiring. Pass the control wires

through the hole provided in the corner post, then feed the

wires thorough the raceway to the RTU-MP. Connect to

the wires to the removable Phoenix connectors and then

reconnect the connectors to the board.

J20-3

C08461

Fig. 63 - RTU-MP T-56 Sensor Connections

Connect T-59 — The T-59 space sensor requires a

separate, isolated power supply of 24 VAC. See Fig. 64

for internal connections at the T-59. Connect the SEN

terminal (BLU) to RTU-MP J20-1. Connect the COM

terminal (BRN) to J20-2. Connect the SET terminal (STO

or BLK) to J20-3.

Space Temperature (SPT) Sensors

A field-supplied Carrier space temperature sensor is

required with the RTU-MP to monitor space temperature.

There are 3 sensors available for this application:

BRN (COM)

BLK (STO)

BLU (SPT)

SENSOR

WIRING

S 33ZCT55SPT, space temperature sensor with override

button

S 33ZCT56SPT, space temperature sensor with override

button and setpoint adjustment

SET SEN

S 33ZCT59SPT, space temperature sensor with LCD

(liquid crystal display) screen, override button, and

setpoint adjustment

OPB COM- PWR+

Use 20 gauge wire to connect the sensor to the controller.

The wire is suitable for distances of up to 500 ft. Use a

three-conductor shielded cable for the sensor and setpoint

adjustment connections. If the setpoint adjustment

(slidebar) is not required, then an unshielded, 18 or 20

gauge, two-conductor, twisted pair cable may be used.

POWER

WIRING

24 VAC

NOTE: Must use a separate isolated transformer.

Connect T-55 — See Fig. 44 for typical T-55 internal

connections. Connect the T-55 SEN terminals to

RTU-MP J20-1 and J20-2. (See Fig. 62.)

C07132

Fig. 64 - Space Temperature Sensor Typical Wiring

(33ZCT59SPT)

J20-1

SEN

Economizer controls —

J20-2

Outdoor Air Enthalpy Control (PNO HH57AC077) -

C08460

The enthalpy control (HH57AC077) is available as a

field-installed accessory to be used with the EconoMi$er2

damper system. The outdoor air enthalpy sensor is part of

the enthalpy control. (The separate field-installed

accessory return air enthalpy sensor (HH57AC078) is

required for differential enthalpy control. See below.)

Fig. 62 - RTU-MP T-55 Sensor Connections

Connect T-56 — See Fig. 46 for T-56 internal

connections. Install a jumper between SEN and SET

terminals as illustrated. Connect T-56 terminals to

RTU-MP J20-1, J20-2 and J20-3 per Fig. 63.

Locate the enthalpy control in the economizer hood.

Locate two GRA leads in the factory harness and connect

these leads to enthalpy control sensors 2 and 3. (See Fig.

49.) Connect the enthalpy control power input terminals to

economizer actuator power leads RED (connect to TR)

and BLK (connect to TR1).

The CO₂sensors are all factory set for a range of 0 to

2000 ppm and a linear mA output of 4 to 20. Refer to the

instructions supplied with the CO₂sensor for electrical

requirements and terminal locations. See Fig. 51 for

typical CO₂sensor wiring schematic.

To accurately monitor the quality of the air in the

conditioned air space, locate the sensor near a return-air

grille (if present) so it senses the concentration of CO₂

leaving the space. The sensor should be mounted in a

location to avoid direct breath contact.

The outdoor enthalpy changeover setpoint is set at the

enthalpy controller.

The enthalpy control receives the outdoor air enthalpy

from the outdoor air enthalpy sensor and provides a dry

contact switch input to the RTU-MP controller. A closed

contact indicates that outside air is preferred to the return

air. An open contact indicates that the economizer should

remain at minimum position.

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources.

Allow at least 3 ft (0.9 m) between the sensor and any

corner. Avoid mounting the sensor where it is influenced

by the supply air; the sensor gives inaccurate readings if

the supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room air

before it is drawn into the return airstream.

Differential Enthalpy Control — Differential enthalpy

control is provided by sensing and comparing the outside

air and return air enthalpy conditions. Install the outdoor

air enthalpy control as described above. Add and install a

return air enthalpy sensor.

Wiring the Indoor Air Quality Sensor —

Return Air Enthalpy Sensor — Mount the return-air

enthalpy sensor (HH57AC078) in the return-air duct. The

return air sensor is wired to the enthalpy controller

(HH57AC077). (See Fig. 50.)

For each sensor, use two 2-conductor 18 AWG (American

Wire Gage) twisted-pair cables (unshielded) to connect

the separate isolated 24 vac power source to the sensor

and to connect the sensor to the control board terminals.

To wire the return air enthalpy sensor, perform the

following:

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

sensor. See Fig. 51. Connect the 4-20 mA terminal to

RTU-MP J4-2 and connect the SIG COM terminal to

RTU-MP J4-3. See Fig. 65.

1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable

to connect the return air enthalpy sensor to the

enthalpy controller.

2. At the enthalpy control remove the factory-installed

resistor from the (SR) and (+) terminals.

IAQ Sensor

J4-2

J4-3

SEN

3. Connect the field-supplied RED wire to (+) spade

connector on the return air enthalpy sensor and the

(SR+) terminal on the enthalpy controller. Connect

the BLK wire to (S) spade connector on the return air

enthalpy sensor and the (SR) terminal on the enthalpy

controller.

COM

24 VAC

C08462

Fig. 65 - RTU-MP / Indoor CO₂Sensor

(33ZCSENCO2) Connections

NOTE: The enthalpy control must be set to the “D”

setting for differential enthalpy control to work properly.

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus

weatherproof enclosure) — The outdoor air CO₂sensor is

designed to monitor carbon dioxide (CO₂) levels in the

outside ventilation air and interface with the ventilation

damper in an HVAC system. The OAQ sensor is packaged

with an outdoor cover. (See Fig. 53.) The outdoor air CO₂

sensor must be located in the economizer outside air hood.

The enthalpy control receives the indoor and return

enthalpy from the outdoor and return air enthalpy sensors

and provides a dry contact switch input to the RTU-MP

controller. A closed contact indicates that outside air is

preferred to the return air. An open contact indicates that

the economizer should remain at minimum position.

Indoor Air Quality (CO₂sensor) — The indoor air quality

sensor accessory monitors space carbon dioxide (CO₂)

levels. This information is used to monitor IAQ levels.

Several types of sensors are available, for wall mounting

in the space or in return duct, with and without LCD

display, and in combination with space temperature

sensors. Sensors use infrared technology to measure the

levels of CO₂present in the space air.

Wiring the Outdoor Air CO₂Sensor — A dedicated power

supply is required for this sensor. A two-wire cable is

required to wire the dedicated power supply for the sensor.

The two wires should be connected to the power supply

and terminals 1 and 2.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

OAQ sensor. See Fig. 51. Connect the 4 to 20 mA

terminal to RTU-MP J4-5. Connect the SIG COM

terminal to RTU-MP J4-6. (See Fig. 66.)

Remote Occupancy

The remote occupancy accessory is a field-installed

accessory. This accessory overrides the unoccupied mode

and puts the unit in occupied mode. When installing this

accessory, the unit must be configured for remote

occupancy by setting MENU→Config→Inputs→input 3,

5, 8, or 9 to Remote Occupancy and normally open (N/O)

or normally closed (N/C).

OAQ Sensor/RH Sensor

J4-5

J4-6

SEN

Also set MENU→Schedules→occupancy source to DI

on/off. Input 8 or 9 is recommended for easy of

installation. Refer to Fig. 60 and Table 21 for wire

terminations at J5.

COM

24 VAC

Power Exhaust (output)

C08463

Connect the accessory Power Exhaust contactor coil(s) per

Fig. 67.

Fig. 66 - RTU-MP / Outdoor CO₂Sensor

(33ZCSENCO2) Connections

Power Exhaust

On 48TC units equipped with factory-installed Smoke

Detector(s), the smoke detector controller implements the

unit shutdown through its NC contact set connected to the

unit’s LCTB input. The FSD function is initiated via the

smoke detector’s Alarm NO contact set. The RTU-MP

controler communicates the smoke detector’s tripped

status to the BAS building control. See Fig. 25 for unit

smoke detector wiring.

J11-3

PEC

TAN

LCTB

THERMOSTAT

GRA

C08464

Fig. 67 - RTU-MP Power Exhaust Connections

The

Fire

Shutdown

Switch

configuration,

identifies the

Space Relative Humidity Sensor - The RH sensor is not

used with 48TC models at this time.

MENU→Config→Inputs→input 5,

normally open status of this input when there is no fire

alarm.

Communication Wiring -- Protocols

General

Alarm state is reset when the smoke detector alarm

condition is cleared and reset at the smoke detector in the

unit.

Protocols are the communication languages spoken by

control devices. The main purpose of a protocol is to

communicate information in the most efficient method

possible. Different protocols exist to provide different

kinds of information for different applications. In the BAS

application, many different protocols are used, depending

on manufacturer. Protocols do not change the function of

a controller; just make the front end user different.

The RTU-MP can be set to communicate on four different

protocols: BACnet, Modbus, N2, and LonWorks. Switch 3

(SW3) on the board is used to set protocol and baud rate.

Switches 1 and 2 (SW1 and SW2) are used to set the

board’s network address. See Fig 68 for the switch setting

per protocol. The 3rd party connection to the RTU-MP is

through plug J19. Refer to the RTU-MP 3rd Party

Integration Guide for more detailed information on

protocols, 3rd party wiring, and networking.

Connecting Discrete Inputs

Filter Status

The filter status accessory is a field-installed accessory.

This accessory detects plugged filters. When installing

this accessory, the unit must be configured for filter status

by setting MENU→Config→Inputs→input 3, 5, 8, or 9

to Filter Status and normally open (N/O) or normally

closed (N/C). Input 8 or 9 is recommended for easy of

installation. Refer to Fig. 60 and 61 for wire terminations

at J5.

Fan Status

The fan status accessory is a field-installed accessory.

This accessory detects when the indoor fan is blowing air.

When installing this accessory, the unit must be

NOTE: Power must be cycled after changing the SW1-3

switch settings.

configured

for

fan

status

setting

MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan

Status and normally open (N/O) or normally closed (N/C).

Input 8 or 9 is recommended for easy of installation. Refer

to Fig. 60 and 61 for wire terminations at J5.

SW3 Protocol Selection

PROTOCOL

DS8

DS7

DS6

DS5

DS4

DS3

DS2

DS1

BACnet MS/TP

(Master)

Unused

OFF

Select Baud Select Baud

Modbus

(Slave)

Unused

OFF

Select Baud Select Baud

Unused

OFF

(Slave)

LonWorks

OFF

NOTE:

DS = Dip Switch

BACnet MS/TP SW3 example shown

Baud Rate Selections

BAUD RATE

9600

DS2

OFF

DS1

OFF

19,200

38,400

76,800

C07166

Fig. 68 - RTU-MP SW3 Dip Switch Settings

BACnet MS/TP

Local Access

BACnet Master Slave/Token Passing (MS/TP) is used for

communicating BACnet over sub-network of

BACview Handheld

The BACview⁶is a keypad/display interface used to

connect to the RTU-MP to access the control information,

read sensor values, and test the RTU, see Fig. 69. This is

an accessory interface that does not come with the MP

controller and can only be used at the unit. Connect the

BACview⁶to the RTU-MP’s J12 local access port. There

are 2 password protected levels in the display (User and

Admin). The user password defaults to 0000 but can be

changed. The Admin password is 1111 and cannot be

changed. There is a 10 minute auto logout if a screen is

left idle. See RTU-MP Controls, Start-Up, Operation, and

Troubleshooting Instructions (Form 48-50H-T-2T),

Appendix A for navigation and screen content.

BACnet-only controllers. This is the default Carrier

communications protocol. Each RTU-MP module acts as

an MS/TP Master. The speed of an MS/TP network can

range from 9600 to 76.8K baud. Physical Addresses can

be set from 01 to 99.

Modbus

The RTU-MP module can speak the Modicon Modbus

RTU Protocol as described in the Modicon Modbus

Protocol Reference Guide, PI-MBUS-300 Rev. J. The

speed of a Modbus network can range from 9600 to 76.8K

baud. Physical Addresses can be set from 01 to 99.

Johnson N2

Virtual BACview

N2 is not a standard protocol, but one that was created by

Johnson Controls, Inc. that has been made open and

available to the public. The speed of N2 network is

limited to only 9600 baud. Physical Addresses can be set

from 01 to 99.

Virtual BACview is a freeware computer program that

functions as the BACview⁶Handheld. The USB Link

interface (USB-L) is required to connect a computer to

the RTU-MP board. The link cable connects a USB port

to the J12 local access port. This program functions and

operates identical to the handheld.

LonWorks

LonWorks is an open protocol that requires the use of

Echelon’s Neuron microprocessor to encode and decode

the LonWorks packets. In order to reduce the cost of

adding that hardware on every module, a separate

LonWorks Option Card (LON-OC) was designed to

connect to the RTU-MP.

This accessory card is needed for LonWorks and has to be

ordered and connected using the ribbon cable to plug J15.

The RTU-MP’s baud rate must be set to 38.4k to

communicate with the LON-OC. The address switches

(SW1 & SW2) are not used with LonWorks.

RTU--MP Troubleshooting

Communication LEDs

The LEDs indicate if the controller is speaking to the

devices on the network. The LEDs should reflect

communication traffic based on the baud rate set. The

higher the baud rate the more solid the LEDs will appear.

C07170

Fig. 69 - BACview⁶Handheld Connections

Table 22 – LEDs

The LEDs on the RTU-MP show the status of certain functions

If this LED is on...

Status is...

Power

The RTU MP has power

The RTU MP is receiving data from the network segment

The RTU MP is transmitting data over the network segment

The digital output is active

DO#

The Run and Error LEDs indicate control module and network status

If Run LED shows...

2 flashes per second

And Error LED shows...

Off

Status is...

Normal

Five minute auto---restart delay after

system error

Control module has just been

formatted

Two or more devices on this network

have the same ARC156 network address

Exec halted after frequent system errors

or control programs halted

Exec start---up aborted, Boot is running

Firmware transfer in progress, Boot is

running

2 flashes,

2 flashes per second

alternating with Run LED

3 flashes,

then off

4 flashes,

then pause

2 flashes per second

5 flashes per second

Off

7 flashes per second, alternating with

Run LED

14 flashes per second,

alternating with Run LED

Ten second recovery period after

brownout

7 flashes per second

14 flashes per second

Brownout

Failure. Try the following solutions:

Turn the RTU---MP off, then on.

Form at the R TU --- M P.

Download memory to the RTU---MP.

Replace the RTU---MP.

Table 23 – Troubleshooting Alarms

BACnet

OBJECT

NAME

ACTION TAKEN BY

CONTROL

RESET

METHOD

POINT NAME

Safety Chain Alarm

Fire Shutdown Alarm

PROBABLE CAUSE

Alarm Generated

Immediate

safety_chain

fire_alarm

spt_alarm

sat_alarm

Automatic

Over load Indoor Fan or Electric Heater overheat.

Shutdown

Alarm Generated

Immediate

Shutdown

Alarm Generated

Immediate

Shutdown

Alarm Generated

Immediate

Shutdown

Smoke detected by smoke detector or

configuration incorrect

Space Temp Sensor

Failure

Faulty, shorted, or open thermistor caused by

wiring error or loose connection.

Faulty, shorted, or open thermistor caused by

wiring error or loose connection.

SAT Sensor Alarm

The space temperature has risen above the cool

setpoint by more than the desired amount.

The space temperature has dropped below the

heat setpoint by more than the desired amount.

SAT is greater then 160 degrees for more than 5

minutes.

High Space Temp Alarm

Low Space Temp Alarm

High Supply Air Temp

Low Supply Air Temp

spt_hi

spt_lo

sat_hi

sat_lo

Alarm Generated

Automatic

The supply air temperature is below 35_F for

more than 5 minutes.

Alarm Generated

Immediately

Tripped Circuit Breaker, Broken belt, Bad indoor

fan motor, Configuration incorrect, Bad fan status

switch.

Supply Fan Failed to

Start

sf_fail

Automatic

disable Operation

Alarm Generated

Ramp down

Supply Fan in Hand

sf_hand

Bad Fan Status Switch, Configuration incorrect.

Operations

Compressor Safety

Alarm

dx_compstat

slide_alarm

Alarm Generated

Automatic

Compressor would not start.

Alarm Generated

Offset set to zero

STO sensor is open or shorted for more then 5

seconds.

Setpoint Slider Alarm

Automatic/re

set timer

when

configured

with or

without

switch

Dirty Filter, supply fan run time exceeded, filter

switch configuration wrong.

Dirty Filter Alarm

filter

Alarm Generated

Disable

misconfigured switch

functions

Alarm Generated

Disable 4 selectable

analog inputs

Alarm Generated

Economizer and Low

ambient DX cooling

lockout disabled.

Alarm Generated

Dehumidification

disabled

More than one binary input is configured for the

same purpose. More then one discrete input is

configured to provide the same function.

Switch Configuration

Alarm

Configure

correctly

sw_cfg_alarm

an_cfg_alarm

oat_alarm

Misconfigured Analog

Input

Configure

correctly

More then one analog input is configured to

provide the same function.

Faulty, shorted, or open thermistor caused by

wiring error or loose connection.

OAT Sensor Alarm

Automatic

Sensor reading is out of range. Bad sensor, bad

wiring, or sensor configured incorrectly.

Space RH Sensor Alarm

sprh_alarm

oarh_alarm

Automatic

Outdoor RH Sensor

Alarm

Sensor reading is out of range. Bad sensor, bad

wiring, or sensor configured incorrectly.

IRH is greater then 70% for more then 10

minutes.

Alarm Generated

High Space Humidity

Low Space Humidity

sprh_hi

sprh_lo

Alarm Generated

Automatic

Alarm Generated

Disables IAQ

IRH is less then 35% for more then 10 minutes.

Sensor reading is out of range. Bad sensor, bad

wiring, or sensor configured incorrectly.

Operation

IAQ Sensor Alarm

iaq_alarm

Automatic

Economizer moves

to minimum position

Alarm Generated Set

OAQ to 400

Sensor reading is out of range. Bad sensor, bad

wiring, or sensor configured incorrectly.

OAQ Sensor Alarm

oaq_alarm

co2_hi

Automatic

High Carbon Dioxide

Level

Supply Fan Runtime

Alarm

Compressor 1 Runtime

Alarm

Compressor 2 Runtime

Alarm

Alarm Generated

CO2 reading is above 1200ppm.

clear the

timer

clear the

timer

clear the

timer

sf_rntm

Supply fan run time exceeded user defined limit.

Compressor run time limit is exceeded.

dx1_rntm

dx2_rntm

Misconfigured Analog Input

Alarms

This occurs if more than one analog input (inputs 1 & 2)

is configured for the same sensor. When this happens the

two inputs will be disabled as inputs. This alarm will

automatically be cleared when configuration is corrected.

An example of this would be: Input 1 = IAQ Sensor, input

2 = IAQ Sensor; the alarm would be active, unit would

run, but the IAQ Sensor (inputs 1 & 2) will be interpreted

as “No Function.”

Alarms can be checked through the network and/or the

local access. All the alarms are listed in Table 23 with

name, object name, action taken by control, reset method,

and probable cause. There are help screens for each alarm

on the local access display and listed in RTU-MP

Controls, Start-Up, Operation, and Troubleshooting

Instructions (Form 48-50H-T-2T), Appendix A: Help

Screens. Some alarms are explained in detail below.

Safety Chain Alarm

Third Party Networking

This alarm occurs immediately if the supply-fan internal

overload trips or if an electric-heat limit switch trips. The

Unit Status will be Shutdown and the System Mode will

be Disable. When this happens LCTB (R terminal) will

not have 24 VAC, but the RTU-MP board will still be

powered. All unit operations stop immediately and will

not restart until the alarm automatically clears. There are

no configurations for this alarm; it is all based on internal

wiring. This alarm will never occur if Fire Shutdown

Alarm is active.

Third

party

communication

and

networking

troubleshooting should be done by or with assistance from

the front end 3rd party technician. A Module Status

Report (Modstat) can be run from the BACview⁶, see

Table 24 to perform. This lists information about the

board status and networking state. For basic

troubleshooting, see Table 25. Refer to the RTU-MP 3rd

Party Integration Guide for additional information.

BACnet MS/TP

1. Verify that the BAS and controller are both set to

speak the BACnet MS/TP protocol. The protocol of

the controller is set via SW3 (switches 3, 4, 5, and 6).

The protocol can also be verified by getting a Modstat

of the controller through the BACview. Hit the “FN”

key and the ’.’ key at the same time to pull up a

Modstat. Scroll to the bottom of the page and there is

a section entitled “Network Communications.” The

active protocol and baud rate will be shown in this

section.

2. Verify that the BAS and controller are set for the

same baud rate. The baud rate of the controller is set

via SW3 (switches 1 and 2). The baud rate can also

be verified via the BACview by obtaining a Modstat.

(See Fig. 70.)

Fire Shutdown Alarm

This alarm occurs immediately when the smoke detector

senses smoke. The Unit Status will be Shutdown and the

System Mode will be Disable. All unit operations stop

immediately and will not restart until the alarm

automatically clears. If there is not a smoke detector

installed or the smoke detector did not trip, check input

configurations.

Space Temp Sensor Failure

This alarm occurs if the space sensor wired to the

RTU-MP is disconnected or shorted for more then 10

seconds. When this occurs the Unit Status will be

Shutdown and the System Mode will be Run. Sensor,

sensor connections, wiring, board connection, and

configurations should be checked for faults or errors.

Alarm will reset automatically when cause is fixed.

3. Verify that the BAS is configured to speak 2-wire

EIA-485 to the controller. The BAS may have to

configure jumper or DIP switches on their end.

SAT Sensor Alarm

This alarm occurs immediately when the supply air

temperature sensor wired to the RTU-MP is disconnected

or shorted. When this occurs the Unit Status will be

Shutdown and the System Mode will be Run. Sensor,

sensor connections, wiring, board connection, and

configurations should be checked for faults or errors.

Alarm will reset automatically when cause is fixed.

4. Verify that the BAS and the controller have the same

communication settings (8 data bits, No Parity, and 1

stop bit).

5. Verify that the controller has a unique MAC address

on the MS/TP bus. The controller’s MS/TP MAC

address is set by its rotary address switches.

6. Verify proper wiring between the BAS and the

controller.

Switch Configuration Alarm

This occurs if more than one binary input (inputs 3, 5, 8,

and 9) is configured for the same function. When this

happens the two inputs (or more) configured wrong will

be disabled as an inputs. This alarm will automatically be

cleared when configuration is corrected.

7. Verify that the BAS is reading or writing to the proper

BACnet objects in the controller. Download the latest

points list for the controller to verify.

8. Verify that the BAS is sending his requests to the

proper MS/TP MAC address of our controller.

An example of this would be: Input 3 = Compressor

Safety, input 5 = Fan Status, input 8 = Fan Status, and

input 9 = Humidistat; the alarm would be active, unit

would run, compressor safety and humidistat would

function normally, and Fan Status (inputs 5 & 8) will be

interpreted as “No Function.”

9. Present the BAS company with a copy of our

controller’s BACnet PICS so that they know which

BACnet commands are supported. See below.

Device Instance: 0160001

1 PRGs loaded. 1 PRGs running.

Module status:

Firmware sections validated in flash memory

============================================

Boot16-H

- v2.06:001 Jun 19 2007

- v2.09:050 Jun 26 2007

RTU-MP DRIVER

Reset counters:

11 Power failures

0 Brownouts

18 Commanded warm boots

22 Commanded cold boots

0 System errors

0 Watchdog timeouts

System error message history:

Warning message history:

Type Specific

Information message history:

POWERUP: BACnet reinitialize warmstart

Menu file not found.

06/29/07 10:49:40

06/29/07 10:48:35

ARC156 reconfigurations during the last hour (cleared upon reset):

Total ....................... 0

Initiated by this node ...... 0

Core board hardware:

Type=147, board=34, manufactured on 05/14/2007, S/N 21A740188N

RAM: 1024 kBytes;

FLASH: 1024 kBytes, type = 3

Base board hardware:

Type=147, board=71, manufactured on 05/14/2007, S/N RMP750037N

Largest free heap space = 65536.

Database size = 742082 , used = 352162, free = 389920.

Raw physical switches: 0x01280000

Module Communications:

Network Protocol=BACnet MSTP Master

Network Baud Rate=9600 bps

C07195

Fig. 70 - Module Status Report (Modstat) Example

10. In certain situations, it may be necessary to tweak the

MS/TP Protocol timing settings through the

BACview⁶. There are two settings that may be

tweaked:

S MaxInfo Frames: This property defines the maximum

number of responses that will be sent when our controller

gets the token. A valid number is any positive integer.

The default is 10 and should be ideal for the majority of

applications. In cases where the controller is the target of

many requests, this number could be increased as high as

100 or 200.

NOTE: MS/TP networks can be comprised of both

Master and Slave nodes. Valid MAC addresses for Master

nodes are 0 - 127 and valid addresses for Slave nodes are

0 - 254.

S Max Masters: Defines the highest MS/TP Master MAC

address on this MS/TP network. For example, if there are

3 master nodes on an MS/TP network, and their MAC

addresses are 1, 8, and 16, then Max Masters would be set

to 16 (since this is the highest MS/TP MAC address on

the network). This property optimizes MS/TP network

communications by preventing token passes and “poll for

master” requests to non-existent Master nodes (i.e., in

the above example, MAC address 16 would know to pass

the token back to MAC address 1 instead of counting up

to MAC address 127).

NOTE: See RTU-MP 3rd Party Integration Guide (or

alternatively RTU-MP Controls, Start-Up, Operation, and

Troubleshooting Instructions (Form 48-50H-T-2T)

Appendix) for Protocol Maps.

Each MS/TP master node on the network must have their

Max Masters set to this same value. The default is 127.

Table 24 – Manufacture Date

When troubleshooting, you may need to know a control module’s manufacture date

Obtain the manufacture date from

a...

Notes

Module status report (modstat)

To obtain a modstat with BACview :

1. Press Function (FN) key and hold.

2. Then press period (.)

3. Release both buttons.

The report shows the date under Main board hardware.

Sticker on the back of the main control The serial numbers are unique and contain embedded information:

module board

”Serial No: RMPYMxxxxN”

(Bar Coded & Typed Number)

“RMP”

“YM”

---

These first three digits are unique to RTU---MP and are used as an identifier.

These two digits identify the last digit of the year and month (in hex, A=10/Oct)

of manufacture. ”74” would represent a date of manufacture of ”April 2007”.

These four digits represent the sequential number of units produced for a given

product for the mentioned manufacturing time period.

This final digit represents the decade and toggles between ”N” and ”M” every

ten years.

“xxxx”

---

“N”

Table 25 – Basic Protocol Troubleshooting

Problem

No communication with 3rd

party vendor

Possible cause

Incorrect settings on SW1, SW2 and SW3

Corrective action

Verify and correct switch settings. Cycle

power to RTU---MP after changing switch

settings.

RS485 Port has no voltage output

(check with RTU---MP disconnected from RS485

communication bus)

Verify RTU---MP has correct power supply

Possible bad driver on board.

Bacnet @ 9600/19.2K --- .01 to .045vdc

Check RS485 bus for external before

reconnecting to the bus

Bacnet @ 38.4K --- .06 to .09vdc

Bacnet @ 76.8K --- .1vdc

Voltage, shorts or grounding

before reconnecting to the bus

Modbus @ 9600 --- 76.8K --- .124vdc

N2 @ 9600 --- .124vdc

Verify devices are daisy chained and repeaters and bias

terminators are correctly installed

Check 3rd party vendor RS485

communication wiring guidelines and

troubleshooting procedures

Table 26 – Modbus Exception Codes that May be

Returned From This Controller

2. Verify that the BAS and controller are set for the

same baud rate. The baud rate of the controller is set

via SW3 (switches 1 and 2). The baud rate can also

be verified via the BACview by obtaining a Modstat

(see Fig. 70).

3. Verify that the BAS is configured to speak 2-wire

EIA-485 to the controller. The BAS may have to

configure jumper or DIP switches on their end.

4. Verify that the BAS and the controller have the same

communication settings (8 data bits, No Parity, and 1

stop bit).

5. Verify that the controller has a unique Modbus slave

address. The controller’s Modbus slave address is set

by its rotary address switches.

CODE

NAME

MEANING

The Modbus function code used

in the query is not supported by

the controller.

Illegal Function

The register address used in the

query is not supported by the

controller.

Illegal Data Address

Slave Device Failure

The Modbus Master has

attempted to write to a

non---existent register or a

read---only register in the

controller.

Modbus

6. Verify that the BAS is using the proper Modbus

function codes to access data from our controller.

Supported function codes are shown above.

7. Verify proper wiring between the BAS and the

controller.

8. Verify that the BAS is reading or writing to the proper

Modbus register numbers on the controller. Download

the latest points list for the controller to verify.

9. Verify that the BAS is sending his requests to the

proper slave address of our controller.

1. Verify that the BAS and controller are both set to

speak the Modbus RTU protocol. The protocol of the

controller is set via SW3 (switches 3, 4, 5, and 6).

The protocol can also be verified by getting a Modstat

of the controller through the BACview. Hit the ”FN”

key and the ’.’ key at the same time to pull up a

Modstat. Scroll to the bottom of the page and there is

a section entitled “Network Communications.” The

active protocol and baud rate will be shown in this

section.

NOTE: See RTU-MP 3rd Party Integration Guide (or

alternatively RTU-MP 3rd Party Integration Guide (or

alternatively RTU-MP Controls, Start-Up, Operation, and

Troubleshooting Instructions (Form 48-50H-T-2T),

Appendix) for Modbus Protocol Conformance Statement.

ECONOMI$ER SYSTEMS

The 48TC units may be equipped with a factory-installed

or accessory (field-installed) economizer system. Two

types are available: with

(EconoMi$er IV) and without

logic control system

control system

(EconoMi$er2, for use with external control systems such

as PremierLink). See Fig. 71 and Fig. 72 for component

locations on each type. See Fig. 73 and Fig. 74 for

economizer section wiring diagrams.

1. Verify that the BAS and controller are both set to

speak the N2 protocol. The protocol of the controller

is set via SW3 (switches 3, 4, 5, and 6). The protocol

can also be verified by getting a Modstat of the

controller through the BACview. Hit the “FN” key

and the ’.’ key at the same time to pull up a Modstat.

Scroll to the bottom of the page and there is a section

entitled ”Network Communications.” The active

protocol and baud rate will be shown in this section.

Both EconoMi$ers use direct-drive damper actuators.

ECONOMI$ER IV

CONTROLLER

WIRING

HARNESS

ACTUATOR

(HIDDEN)

2. Verify that the BAS and controller are set for 9600

baud. The baud rate of the controller is set via SW3

(switches 1 and 2). The baud rate can also be verified

via the BACview by obtaining a Modstat. (See Fig.

70.)

3. Verify that the BAS is configured to speak 2-wire

EIA-485 to the controller. The BAS may have to

configure jumper or DIP switches on their end.

LOW TEMPERATURE

COMPRESSOR

LOCKOUT SWITCH

OUTSIDE AIR

TEMPERATURE SENSOR

(OPERATING LOCATION)

C07367

Fig. 71 - EconoMi$er IV Component Locations

4. Verify that the BAS and the controller have the same

communication settings (8 data bits, No Parity, and 1

stop bit).

OUTDOOR

AIR HOOD

5. Verify that the controller has a unique N2 slave

address on the N2 bus. The controller’s N2 slave

address is set by its rotary address switches.

6. Verify proper wiring between the BAS and the

controller.

ECONOMI$ER2

HOOD

PLUG

SHIPPING

BRACKET

7. Verify that the BAS is reading or writing to the proper

network point addresses on the controller. Download

the latest points list for the controller to verify.

8. Verify that the BAS is sending his requests to the

proper slave address of our controller.

GEAR DRIVEN

DAMPER

BAROMETRIC

RELIEF

DAMPER

NOTE: See RTU-MP 3rd Party Integration Guide (or

alternatively RTU-MP 3rd Party Integration Guide (or

alternatively RTU-MP Controls, Start-Up, Operation, and

Troubleshooting Instructions (Form 48-50H-T-2T)

Appendix) for N2 Protocol Conformance Statement.

C06022

Fig. 72 - EconoMi$er2 Component Locations

C09023

Fig. 73 - EconoMi$er IV Wiring

BLACK

BLUE

TRANSFORMER

GROUND

500 OHM

RESISTOR

VIOLET

PINK

NOTE 1

NOTE 3

RUN

OAT SENSOR

RED

24 VAC

50HJ540573

ACTUATOR

ASSEMBLY

4-20 mA

WHITE

DIRECT DRIVE

ACTUATOR

TO J9 ON

PremierLink

BOARD

4-20mA SIGNAL

ECONOMISER2 PLUG

NOTES:

1. Switch on actuator must be in run position for economizer to operate.

2. PremierLink™ control requires that the standard 50HJ540569 outside-air sensor be replaced by either the CROASENR001A00 dry bulb sen

sor or HH57A077 enthalpy sensor.

3. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor.

C08310

Fig. 74 - EconoMi$er2 with 4 to 20 mA Control Wiring

Table 27 – EconoMi$er IV Input/Output Logic

INPUTS

OUTPUTS

N Terminal†

Enthalpy*

Compressor

Demand Control

Ventilation (DCV)

Y1 Y2

Occupied

Unoccupied

Closed

Stage Stage

Outdoor

Return

Low

Damper

On On

On Off

Off Off

Off

High

(Free Cooling LED

Off)

Minimum position

Below set

(DCV LED Off)

Modulating** (between

min. position and

full-open)

Modulating**

(between closed and

full-open)

On On

Off

Low

(Free Cooling LED

On)

High

On Off

Off Off

On On

Off

Minimum position

Closed

Modulating††

(between closed and

DCV

High

(Free Cooling LED

Off)

Modulating†† (between

min. position and DCV

maximum)

On Off

Off Off

On On

On Off

Off Off

Off

Low

Above set

(DCV LED On)

maximum)

Off

Low

(Free Cooling LED

On)

High

Modulating***

Modulating†††

†

For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint.

Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).

** Modulation is based on the supply-air sensor signal.

†† Modulation is based on the DCV signal.

*** Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV)

or fully open (supply-air signal).

††† Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully

open (supply-air signal).

C06053

Fig. 75 - EconoMi$er IV Functional View

EconoMi$er IV Standard Sensors

EconoMi$er IV

Outdoor Air Temperature (OAT) Sensor

Table 27 provides a summary of EconoMi$er IV.

Troubleshooting instructions are enclosed.

The outdoor air temperature sensor (HH57AC074) is a 10

to 20 mA device used to measure the outdoor-air

temperature. The outdoor-air temperature is used to

determine when the EconoMi$er IV can be used for free

cooling. The sensor is factory-installed on the

EconoMi$er IV in the outdoor airstream. (See Fig. 71.)

The operating range of temperature measurement is 40_ to

100_F (4_ to 38_C). (See Fig. 78.)

A functional view of the EconoMi$er is shown in Fig. 75.

Typical settings, sensor ranges, and jumper positions are

also shown. An EconoMi$er IV simulator program is

available from Carrier to help with EconoMi$er IV

training and troubleshooting.

Supply Air Temperature (SAT) Sensor

The scale on the potentiometer is A, B, C, and D. See Fig.

74 for the corresponding temperature changeover values.

The supply air temperature sensor is a 3 K thermistor

located at the inlet of the indoor fan. (See Fig. 76.) This

sensor is factory installed. The operating range of

temperature measurement is 0° to 158_F (-18_ to 70_C).

See Table 15 for sensor temperature/resistance values.

SUPPLY AIR

TEMPERATURE

SENSOR

MOUNTING

LOCATION

SUPPLY AIR

TEMPERATURE

SENSOR

C06033

C06034

Fig. 77 - EconoMi$er IV Controller Potentiometer

and LED Locations

Fig. 76 - Supply Air Sensor Location

The temperature sensor looks like an eyelet terminal with

wires running to it. The sensor is located in the “crimp

end” and is sealed from moisture.

LED ON

Outdoor Air Lockout Sensor

The EconoMi$er IV is equipped with an ambient

temperature lockout switch located in the outdoor

airstream which is used to lock out the compressors below

a 42_F (6_C) ambient temperature. (See Fig. 71.)

LED ON

LED OFF

LED ON

LED OFF

EconoMi$er IV Control Modes

LED ON

LED OFF

IMPORTANT: The optional EconoMi$er2 does not

include a controller. The EconoMi$er2 is operated by a 4

to 20 mA signal from an existing field-supplied controller

(such as PremierLink™ control). See Fig. 74 for wiring

information.

LED OFF

85 90

100

55 60

70 75

DEGREES FAHRENHEIT

40 45

C06035

Determine the EconoMi$er IV control mode before set up

of the control. Some modes of operation may require

different sensors. (See Table 27.) The EconoMi$er IV is

supplied from the factory with a supply-air temperature

sensor and an outdoor-air temperature sensor. This allows

for operation of the EconoMi$er IV with outdoor air dry

bulb changeover control. Additional accessories can be

added to allow for different types of changeover control

and operation of the EconoMi$er IV and unit.

Fig. 78 - Outside Air Temperature Changeover

Setpoints

Outdoor Dry Bulb Changeover

The standard controller is shipped from the factory

configured for outdoor dry bulb changeover control. The

outdoor air and supply air temperature sensors are

included as standard. For this control mode, the outdoor

temperature is compared to an adjustable setpoint selected

on the control. If the outdoor-air temperature is above the

setpoint, the EconoMi$er IV will adjust the outside air

dampers to minimum position. If the outdoor-air

temperature is below the setpoint, the position of the

outside air dampers will be controlled to provided free

cooling using outdoor air. When in this mode, the LED

next to the free cooling setpoint potentiometer will be on.

The changeover temperature setpoint is controlled by the

free cooling setpoint potentiometer located on the control.

(See Fig. 77.)

0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45 0.50

STATIC PRESSURE (in. wg)

C06031

Fig. 79 - Outdoor-Air Damper Leakage

Differential Dry Bulb Control

In this mode of operation, the outdoor-air temperature is

compared to the return-air temperature and the lower

temperature airstream is used for cooling. When using this

mode of changeover control, turn the enthalpy setpoint

potentiometer fully clockwise to the D setting. (See Fig.

77.)

For differential dry bulb control the standard outdoor dry

bulb sensor is used in conjunction with an additional

accessory

dry

bulb

sensor

(part

number

CRTEMPSN002A00). The accessory sensor must be

mounted in the return airstream. (See Fig. 80.) Wiring is

provided in the EconoMi$er IV wiring harness. (See Fig.

73.)

Outdoor Enthalpy Changeover

For enthalpy control, accessory enthalpy sensor (part

number HH57AC078) is required. Replace the standard

outdoor dry bulb temperature sensor with the accessory

enthalpy sensor in the same mounting location. (See Fig.

80.) When the outdoor air enthalpy rises above the

outdoor enthalpy changeover setpoint, the outdoor-air

damper moves to its minimum position. The outdoor

enthalpy changeover setpoint is set with the outdoor

enthalpy setpoint potentiometer on the EconoMi$er IV

controller. The setpoints are A, B, C, and D. (See Fig. 81.)

The factory-installed 620-ohm jumper must be in place

across terminals S_Rand SR+ on the EconoMi$er IV

controller.

ECONOMI$ERIV

CONTROLLER

ECONOMI$ERIV

GROMMET

RETURN AIR

SENSOR

RETURN DUCT

(FIELD-PROVIDED)

C07085

Fig. 80 - Return Air Temperature or Enthalpy Sensor

Mounting Location

95 100 105 110

(29) (32) (35) (38) (41) (43)

CONTROL CONTROL POINT

CURVE

APPROX. deg. F (deg. C)

AT 50% RH

(27)

73 (23)

70 (21)

67 (19)

63 (17)

(24)

(21)

(18)

(16)

(13)

(10)

(7)

(4)

(2)

HIGH LIMIT

CURVE

(2)

95 100 105 110

(4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)

APPROXIMATE DRY BULB TEMPERATURE--degrees F (degrees C)

C06037

Fig. 81 - Enthalpy Changeover Setpoints

Adjust the DCV potentiometers to correspond to the DCV

voltage output of the indoor air quality sensor at the

user-determined setpoint. (See Fig. 83.)

TR1

EXH

Set

10V

CO SENSOR MAX RANGE SETTING

EXH

Va c

HOT

24 Vac

COM

6000

5000

4000

3000

2000

1000

Min

Pos

Open

DCV

Max

10V

800 ppm

900 ppm

1000 ppm

1100 ppm

AQ1

SO+

SR+

DCV

Set

10V

Free

Cool

EF1

DAMPER VOLTAGE FOR MAX VENTILATION RATE

C06038

C06039

Fig. 82 - EconoMi$er IV Control

Differential Enthalpy Control

Fig. 83 - CO₂Sensor Maximum Range Settings

If a separate field-supplied transformer is used to power

the IAQ sensor, the sensor must not be grounded or the

EconoMi$er IV control board will be damaged.

When using demand ventilation, the minimum damper

position represents the minimum ventilation position for

For differential enthalpy control, the EconoMi$er IV

controller uses two enthalpy sensors (HH57AC078 and

CRENTDIF004A00), one in the outside air and one in the

return air duct. The EconoMi$er IV controller compares

the outdoor air enthalpy to the return air enthalpy to

determine EconoMi$er IV use. The controller selects the

lower enthalpy air (return or outdoor) for cooling. For

example, when the outdoor air has a lower enthalpy than

the return air, the EconoMi$er IV opens to bring in

outdoor air for free cooling.

Replace the standard outside air dry bulb temperature

sensor with the accessory enthalpy sensor in the same

mounting location. (See Fig. 71.) Mount the return air

enthalpy sensor in the return air duct. (See Fig. 80.)

Wiring is provided in the EconoMi$er IV wiring harness.

(See Fig. 73.) The outdoor enthalpy changeover setpoint is

set with the outdoor enthalpy setpoint potentiometer on

the EconoMi$er IV controller. When using this mode of

changeover control, turn the enthalpy setpoint

potentiometer fully clockwise to the D setting.

VOC (volatile

organic

compounds) ventilation

requirements. The maximum demand ventilation position

is used for fully occupied ventilation.

When demand ventilation control is not being used, the

minimum position potentiometer should be used to set the

occupied ventilation position. The maximum demand

ventilation position should be turned fully clockwise.

Exhaust Setpoint Adjustment

The exhaust setpoint will determine when the exhaust fan

runs based on damper position (if accessory power

exhaust is installed). The setpoint is modified with the

Exhaust Fan Setpoint (EXH SET) potentiometer. (See Fig.

77.) The setpoint represents the damper position above

which the exhaust fans will be turned on. When there is a

call for exhaust, the EconoMi$er IV controller provides a

45 ± 15 second delay before exhaust fan activation to

allow the dampers to open. This delay allows the damper

to reach the appropriate position to avoid unnecessary fan

overload.

Indoor Air Quality (IAQ) Sensor Input

The IAQ input can be used for demand control ventilation

control based on the level of CO₂measured in the space

or return air duct.

Minimum Position Control

There is both a factory-installed (FIOP) CO₂option

(sensor 8001B with no display, which is mounted on the

side of the EconoMi$er) and a field-installed CO₂option

(sensor 8002 with display, which is mounted on the return

air duct). While performing the same function, they differ

in their ability to be configured. The FIOP version is

preset and requires no changes in most applications. If a

configuration change is required, service kit #UIP2072

(software CD, cables, and instructions) and a laptop PC

are required. The field-installed version with display can

be configured stand-alone. (See section “CO₂Sensor

Configuration”.)

There is a minimum damper position potentiometer on the

EconoMi$er IV controller. (See Fig. 77.) The minimum

damper position maintains the minimum airflow into the

building during the occupied period.

When using demand ventilation, the minimum damper

position represents the minimum ventilation position for

VOC

(volatile

organic

compound)

ventilation

requirements. The maximum demand ventilation position

is used for fully occupied ventilation.

When demand ventilation control is not being used, the

minimum position potentiometer should be used to set the

occupied ventilation position. The maximum demand

ventilation position should be turned fully clockwise.

Mount the accessory IAQ sensor according to

manufacturer specifications. The IAQ sensor should be

wired to the AQ and AQ1 terminals of the controller.

Adjust the minimum position potentiometer to allow the

minimum amount of outdoor air, as required by local

codes, to enter the building. Make minimum position

adjustments with at least 10_F temperature difference

between the outdoor and return-air temperatures.

To determine the minimum position setting, perform the

following procedure:

Thermostats

The EconoMi$er IV control works with conventional

thermostats that have a Y1 (cool stage 1), Y2 (cool stage

2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The

EconoMi$er IV control does not support space

temperature sensors. Connections are made at the

thermostat terminal connection board located in the main

control box.

1. Calculate the appropriate mixed air temperature

using the following formula:

Demand Control Ventilation (DCV)

When using the EconoMi$er IV for demand controlled

ventilation, there are some equipment selection criteria

which should be considered. When selecting the heat

capacity and cool capacity of the equipment, the

maximum ventilation rate must be evaluated for design

conditions. The maximum damper position must be

calculated to provide the desired fresh air.

Typically the maximum ventilation rate will be about 5 to

10% more than the typical cfm required per person, using

normal outside air design criteria.

A proportional anticipatory strategy should be taken with

the following conditions: a zone with a large area, varied

occupancy, and equipment that cannot exceed the required

ventilation rate at design conditions. Exceeding the

required ventilation rate means the equipment can

condition air at a maximum ventilation rate that is greater

than the required ventilation rate for maximum

occupancy. A proportional-anticipatory strategy will cause

the fresh air supplied to increase as the room CO₂level

increases even though the CO₂setpoint has not been

reached. By the time the CO₂level reaches the setpoint,

the damper will be at maximum ventilation and should

maintain the setpoint.

100

+ (TR x

(T_{O x}

)

) =T_M

T_O= Outdoor-Air Temperature

OA = Percent of Outdoor Air

T_R= Return-Air Temperature

RA = Percent of Return Air

_M= Mixed-Air Temperature

As an example, if local codes require 10% outdoor

air during occupied conditions, outdoor-air

temperature is 60_F, and return-air temperature is

75_F.

(60 x .10) + (75 x .90) = 73.5_F

2. Disconnect the supply air sensor from terminals T

and T1.

3. Ensure that the factory-installed jumper is in place

across terminals P and P1. If remote damper

positioning is being used, make sure that the

terminals are wired according to Fig. 73 and that the

minimum position potentiometer is turned fully

clockwise.

4. Connect 24 vac across terminals TR and TR1.

In order to have the CO₂sensor control the economizer

damper in this manner, first determine the damper voltage

output for minimum or base ventilation. Base ventilation

is the ventilation required to remove contaminants during

unoccupied periods. The following equation may be used

to determine the percent of outside air entering the

building for a given damper position. For best results there

should be at least a 10 degree difference in outside and

return-air temperatures.

5. Carefully

adjust

the

minimum

position

potentiometer until the measured mixed air

temperature matches the calculated value.

6. Reconnect the supply air sensor to terminals T and

T1.

Remote control of the EconoMi$er IV damper is desirable

when requiring additional temporary ventilation. If a

field-supplied remote potentiometer (Honeywell part

number S963B1128) is wired to the EconoMi$er IV

controller, the minimum position of the damper can be

controlled from a remote location.

100

+ (TR x

(T_{O x}

)

) =T_M

To control the minimum damper position remotely,

remove the factory-installed jumper on the P and P1

terminals on the EconoMi$er IV controller. Wire the

field-supplied potentiometer to the P and P1 terminals on

the EconoMi$er IV controller. (See Fig. 73.)

T_O= Outdoor-Air Temperature

OA = Percent of Outdoor Air

T_R= Return-Air Temperature

RA = Percent of Return Air

Damper Movement

_M= Mixed-Air Temperature

Once base ventilation has been determined, set the

minimum damper position potentiometer to the correct

position.

Damper movement from full open to full closed (or vice

versa) takes 2-¹/₂minutes.

The same equation can be used to determine the occupied

or maximum ventilation rate to the building. For example,

an output of 3.6 volts to the actuator provides a base

ventilation rate of 5% and an output of 6.7 volts provides

the maximum ventilation rate of 20% (or base plus 15 cfm

per person). Use Fig. 83 to determine the maximum

setting of the CO₂sensor. For example, an 1100 ppm

setpoint relates to a 15 cfm per person design. Use the

1100 ppm curve on Fig. 83 to find the point when the CO₂

sensor output will be 6.7 volts. Line up the point on the

graph with the left side of the chart to determine that the

range configuration for the CO₂sensor should be 1800

ppm. The EconoMi$er IV controller will output the 6.7

volts from the CO₂sensor to the actuator when the CO₂

concentration in the space is at 1100 ppm. The DCV

setpoint may be left at 2 volts since the CO₂sensor

voltage will be ignored by the EconoMi$er IV controller

until it rises above the 3.6 volt setting of the minimum

position potentiometer.

Once the fully occupied damper position has been

determined, set the maximum damper demand control

ventilation potentiometer to this position. Do not set to the

maximum position as this can result in over-ventilation to

the space and potential high humidity levels.

CO₂Sensor Configuration

The CO₂sensor has preset standard voltage settings that

can be selected anytime after the sensor is powered up.

(See Table 28.)

Use setting 1 or 2 for Carrier equipment. (See Table 28.)

1. Press Clear and Mode buttons. Hold at least 5

seconds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

Table 28 – CO₂Sensor Standard Settings

VENTILATION

OPTIONAL

RELAY

ANALOG

OUTPUT

CONTROL

RANGE

(ppm)

RATE

RELAY SETPOINT HYSTERESIS

SETTING

EQUIPMENT

OUTPUT

(cmf/Person)

(ppm)

1000

1100

900

(ppm)

0 --- 1 0 V

4 --- 2 0 m A

Proportional

Exponential

Proportional

Exponential

Proportional

Any

0---2000

0---1100

0 --- 9 0 0

2 --- 1 0 V

7 --- 2 0 m A

Interface w/Standard

Building Control System

0 --- 1 0 V

4 --- 2 0 m A

0 --- 1 0 V

4 --- 2 0 m A

0 --- 1 0 V

4 --- 2 0 m A

Economizer

0 --- 1 0 V

0---1100

0 --- 9 0 0

1100

900

4 --- 2 0 m A

0 --- 1 0 V

4 --- 2 0 m A

0 --- 1 0 V

4 --- 2 0 m A

Health & Safety

—

0---9999

0---2000

5000

700

500

Parking/Air Intakes/

Loading Docks

0 --- 1 0 V

4 --- 2 0 m A

—

Table 29 – EconoMi$er IV Sensor Usage

1. Disconnect power at TR and TR1. All LEDs should

be off. Exhaust fan contacts should be open.

2. Disconnect device at P and P1.

3. Jumper P to P1.

4. Disconnect wires at T and T1. Place 5.6 kilo-ohm

resistor across T and T1.

5. Jumper TR to 1.

6. Jumper TR to N.

7. If connected, remove sensor from terminals SO and +.

Connect 1.2 kilo-ohm 4074EJM checkout resistor

across terminals SO and +.

8. Put 620-ohm resistor across terminals SR and +.

9. Set minimum position, DCV setpoint, and exhaust

potentiometers fully CCW (counterclockwise).

ECONOMI$ER IV WITH OUTDOOR AIR DRY

BULB SENSOR

Accessories Required

None. The outdoor air dry bulb sensor is

factory installed.

APPLICATION

Outdoor Air

Dry Bulb

Differential

CRTEMPSN002A00*

HH57AC078

Dry Bulb

Single Enthalpy

Differential

Enthalpy

HH57AC078 and CRENTDIF004A00*

CO for DCV

Control using a

Wall-Mounted

CO Sensor

33ZCSENCO2

CO for DCV

33ZCSENCO2† and

33ZCASPCO2**

Control using a

Duct-Mounted

CRCBDIOX005A00††

CO Sensor

10. Set DCV maximum position potentiometer fully CW

(clockwise).

11. Set enthalpy potentiometer to D.

12. Apply power (24 vac) to terminals TR and TR1.

Differential Enthalpy

CRENTDIF004A00 and CRTEMPSN002A00 accessories are

used on many different base units. As such, these kits may

contain parts that will not be needed for installation.

†

33ZCSENCO2 is an accessory CO sensor.

** 33ZCASPCO2 is an accessory aspirator box required for

duct-mounted applications.

†† CRCBDIOX005A00 is an accessory that contains both

33ZCSENCO2 and 33ZCASPCO2 accessories.

To check differential enthalpy:

1. Make sure EconoMi$er IV preparation procedure has

been performed.

3. Use the Up/Down button to select the preset

number. (See Table 28.)

4. Press Enter to lock in the selection.

2. Place 620-ohm resistor across SO and +.

3. Place 1.2 kilo-ohm resistor across SR and +. The

Free Cool LED should be lit.

5. Press Mode to exit and resume normal operation.

4. Remove 620-ohm resistor across SO and +. The Free

Cool LED should turn off.

5. Return EconoMi$er IV settings and wiring to normal

after completing troubleshooting.

The custom settings of the CO₂sensor can be changed

anytime after the sensor is energized. Follow the steps

below to change the non-standard settings:

1. Press Clear and Mode buttons. Hold at least 5

seconds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

Single Enthalpy

To check single enthalpy:

1. Make sure EconoMi$er IV preparation procedure has

been performed.

2. Set the enthalpy potentiometer to A (fully CCW). The

Free Cool LED should be lit.

3. Set the enthalpy potentiometer to D (fully CW). The

Free Cool LED should turn off.

4. Return EconoMi$er IV settings and wiring to normal

after completing troubleshooting.

3. Use the Up/Down button to toggle to the NONSTD

menu and press Enter.

4. Use the Up/Down button to toggle through each of

the nine variables, starting with Altitude, until the

desired setting is reached.

5. Press Mode to move through the variables.

6. Press Enter to lock in the selection, then press Mode

to continue to the next variable.

DCV (Demand Controlled Ventilation) and Power

Exhaust

Dehumidification of Fresh Air with DCV (Demand

Controlled Ventilation) Control

To check DCV and Power Exhaust:

If normal rooftop heating and cooling operation is not

adequate for the outdoor humidity level, an energy

recovery unit and/or a dehumidification option should be

considered.

1. Make sure EconoMi$er IV preparation procedure has

been performed.

2. Ensure terminals AQ and AQ1 are open. The LED for

both DCV and Exhaust should be off. The actuator

should be fully closed.

3. Connect a 9-v battery to AQ (positive node) and AQ1

(negative node). The LED for both DCV and Exhaust

should turn on. The actuator should drive to between

90 and 95% open.

4. Turn the Exhaust potentiometer CW until the Exhaust

LED turns off. The LED should turn off when the

potentiometer is approximately 90%. The actuator

should remain in position.

EconoMi$er IV Preparation

This procedure is used to prepare the EconoMi$er IV for

troubleshooting. No troubleshooting or testing is done by

performing the following procedure.

NOTE: This procedure requires a 9-v battery, 1.2

kilo-ohm resistor, and a 5.6 kilo-ohm resistor which are

not supplied with the EconoMi$er IV.

IMPORTANT: Be sure to record the positions of all

potentiometers before starting troubleshooting.

5. Turn the DCV setpoint potentiometer CW until the

DCV LED turns off. The DCV LED should turn off

when the potentiometer is approximately 9-v. The

actuator should drive fully closed.

6. Turn the DCV and Exhaust potentiometers CCW until

the Exhaust LED turns on. The exhaust contacts will

close 30 to 120 seconds after the Exhaust LED turns

on.

2. Set the Enthalpy potentiometer to A. The Free Cool

LED turns on. The actuator should drive to between

20 and 80% open.

3. Remove the 5.6 kilo-ohm resistor and jumper T to

T1. The actuator should drive fully open.

4. Remove the jumper across T and T1. The actuator

should drive fully closed.

5. Return EconoMi$er IV settings and wiring to normal

after completing troubleshooting.

7. Return EconoMi$er IV settings and wiring to normal

after completing troubleshooting.

EconoMi$er IV Troubleshooting Completion

DCV Minimum and Maximum Position

This procedure is used to return the EconoMi$er IV to

operation. No troubleshooting or testing is done by

performing the following procedure.

To check the DCV minimum and maximum position:

1. Make sure EconoMi$er IV preparation procedure has

been performed.

1. Disconnect power at TR and TR1.

2. Connect a 9-v battery to AQ (positive node) and AQ1

(negative node). The DCV LED should turn on. The

actuator should drive to between 90 and 95% open.

3. Turn the DCV Maximum Position potentiometer to

midpoint. The actuator should drive to between 20

and 80% open.

4. Turn the DCV Maximum Position potentiometer to

fully CCW. The actuator should drive fully closed.

5. Turn the Minimum Position potentiometer to

midpoint. The actuator should drive to between 20

and 80% open.

6. Turn the Minimum Position Potentiometer fully CW.

The actuator should drive fully open.

7. Remove the jumper from TR and N. The actuator

should drive fully closed.

8. Return EconoMi$er IV settings and wiring to normal

after completing troubleshooting.

2. Set enthalpy potentiometer to previous setting.

3. Set DCV maximum position potentiometer to

previous setting.

4. Set minimum position, DCV setpoint, and exhaust

potentiometers to previous settings.

5. Remove 620-ohm resistor from terminals SR and +.

6. Remove 1.2 kilo-ohm checkout resistor from

terminals SO and +. If used, reconnect sensor from

terminals SO and +.

7. Remove jumper from TR to N.

8. Remove jumper from TR to 1.

9. Remove 5.6 kilo-ohm resistor from T and T1.

Reconnect wires at T and T1.

10. Remove jumper from P to P1. Reconnect device at P

and P1.

11. Apply power (24 vac) to terminals TR and TR1.

Supply-Air Sensor Input

WIRING DIAGRAMS

To check supply-air sensor input:

See Fig. 84 and 85 for typical wiring diagrams.

1. Make sure EconoMi$er IV preparation procedure has

been performed.

C09156

Fig. 84 - 48TC Typical Unit Wiring Diagram - Power (D08, 208/230-3-60)

PRE--START--UP

WARNING

PERSONAL INJURY AND ENVIRONMENTAL

HAZARD

WARNING

PERSONAL INJURY HAZARD

Failure to follow this warning could result in personal

injury or death.

1. Follow recognized safety practices and wear

protective goggles when checking or servicing

refrigerant system.

Failure to follow this warning could result in personal

injury or death.

Relieve pressure and recover all refrigerant before

system repair or final unit disposal.

Wear safety glasses and gloves when handling

refrigerants.

2. Do not operate compressor or provide any electric

power to unit unless compressor terminal cover is

in place and secured.

Keep torches and other ignition sources away from

refrigerants and oils.

3. Do not remove compressor terminal cover until

all electrical sources are disconnected.

4. Relieve all pressure from system before touching

or disturbing anything inside terminal box if

refrigerant leak is suspected around compressor

terminals.

5. Never attempt to repair soldered connection while

refrigerant system is under pressure.

6. Do not use torch to remove any component.

System contains oil and refrigerant under

3. Make the following inspections:

a. Inspect for shipping and handling damages such

as broken lines, loose parts, or disconnected

wires, etc.

b. Inspect for oil at all refrigerant tubing

connections and on unit base. Detecting oil

generally indicates a refrigerant leak. Leak-test

all refrigerant tubing connections using

electronic leak detector, halide torch, or

liquid-soap solution.

pressure. To remove

component, wear

c. Inspect all field-wiring and factory-wiring

connections. Be sure that connections are

protective goggles and proceed as follows:

a. Shut off electrical power and then gas to unit.

b. Recover refrigerant to relieve all pressure from

system using both high-pressure and low

pressure ports.

c. Cut component connection tubing with tubing

cutter and remove component from unit.

completed and tight. Be sure that wires are not

in contact with refrigerant tubing or sharp edges.

d. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin

comb.

4. Verify the following conditions:

d. Carefully unsweat remaining tubing stubs

when necessary. Oil can ignite when exposed

to torch flame.

a. Make sure that condenser-fan blade are correctly

positioned in fan orifice. See Condenser-Fan

Adjustment section for more details.

b. Make sure that air filter(s) is in place.

c. Make sure that condensate drain trap is filled

with water to ensure proper drainage.

d. Make sure that all tools and miscellaneous loose

parts have been removed.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal

injury or death.

START--UP, GENERAL

Unit Preparation

The unit must be electrically grounded in accordance

with local codes and NEC ANSI/NFPA 70 (American

National Standards Institute/National Fire Protection

Association.)

Make sure that unit has been installed in accordance with

installation instructions and applicable codes.

Proceed as follows to inspect and prepare the unit for

initial start-up:

Gas Piping

Check gas piping for leaks.

1. Remove all access panels.

2. Read and follow instructions on all WARNING,

CAUTION, and INFORMATION labels attached to,

or shipped with, unit.

NOTE: When the compressor is rotating in the wrong

direction, the unit will make an elevated level of noise

and will not provide cooling.

WARNING

UNIT OPERATION AND SAFETY HAZARD

Cooling

Failure to follow this warning could result in personal

injury or death.

Set space thermostat to OFF position. To start unit, turn on

main power supply. Set system selector switch at COOL

position and fan switch at AUTO. position. Adjust

thermostat to a setting approximately 5_F (3_C) below

room temperature. Both compressors start on closure of

contactors.

Disconnect gas piping from unit when leak testing at

pressure greater than 1/2 psig. Pressures greater than

1/2 psig will cause gas valve damage resulting in

hazardous condition. If gas valve is subjected to

pressure greater than 1/2 psig, it must be replaced

before use. When pressure testing field-supplied gas

piping at pressures of 1/2 psig or less, a unit connected

to such piping must be isolated by manually closing

the gas valve.

Check unit charge. Refer to Refrigerant Charge section.

Reset thermostat at a position above room temperature.

Both compressors will shut off. Evaporator fan will shut

off immediately.

Return--Air Filters

To shut off unit, set system selector switch at OFF

position. Resetting thermostat at a position above room

temperature shuts unit off temporarily until space

temperature exceeds thermostat setting.

Make sure correct filters are installed in unit (see

Appendix II - Physical Data). Do not operate unit without

return-air filters.

Main Burners

Outdoor--Air Inlet Screens

Main burners are factory set and should require no

adjustment.

Outdoor-air inlet screen must be in place before operating

unit.

To check ignition of main burners and heating controls,

move thermostat setpoint above room temperature and

verify that the burners light and evaporator fan is

energized. Check heating effect, then lower the thermostat

setting below the room temperature and verify that the

burners and evaporator fan turn off.

Compressor Mounting

Compressors are internally spring mounted. Do not loosen

or remove compressor hold down bolts.

Internal Wiring

Check all factory and field electrical connections for

tightness. Tighten as required.

Refer to Table 11 for the correct orifice to use at high

altitudes.

Refrigerant Service Ports

Heating

Each unit system has two 1/4” SAE flare (with check

valves) service ports: one on the suction line, and one on

the compressor discharge line. Be sure that caps on the

ports are tight.

1. Purge gas supply line of air by opening union ahead

of the gas valve. If gas odor is detected, tighten union

and wait 5 minutes before proceeding.

2. Turn on electrical supply and manual gas valve.

Compressor Rotation

3. Set system switch selector at HEAT position and fan

switch at AUTO. or ON position. Set heating

temperature lever above room temperature.

On 3-phase units with scroll compressors, it is important

to be certain compressor is rotating in the proper

direction. To determine whether or not compressor is

rotating in the proper direction:

4. The induced-draft motor will start.

5. After a call for heating, the main burners should light

within 5 seconds. If the burner does not light, then

there is a 22-second delay before another 5-second

try. If the burner still does not light, the time delay is

repeated. If the burner does not light within 15

minutes, there is a lockout. To reset the control, break

the 24 v power to W1.

1. Connect service gauges to suction and discharge

pressure fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge

pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge

pressure does not rise to normal levels:

6. The evaporator-fan motor will turn on 45 seconds

after burner ignition.

4. Note that the evaporator fan is probably also rotating

in the wrong direction.

7. The evaporator-fan motor will turn off in 45 seconds

after the thermostat temperature is satisfied.

5. Turn off power to the unit and install lockout tag.

6. Reverse any two of the unit power leads.

8. Adjust airflow to obtain a temperature rise within the

range specified on the unit nameplate.

7. Re-energize to the compressor. Check pressures.

The suction and discharge pressure levels should now

move to their normal start-up levels.

START

-UP, RTU-MP CONTROL

NOTE: The default value for the evaporator-fan motor

on/off delay is 45 seconds. The Integrated Gas Unit

Controller (IGC) modifies this value when abnormal limit

switch cycles occur. Based upon unit operating conditions,

the on delay can be reduced to 0 seconds and the off delay

can be extended to 180 seconds.

2. At the unit, check fan and system controls for proper

operation.

3. At the unit, check electrical system and connections

of any optional electric reheat coil.

4. Check to be sure the area around the unit is clear of

construction dirt and debris.

5. Check that final filters are installed in the unit. Dust

and debris can adversely affect system operation.

6. Verify that the PremierLink controls are properly

connected to the CCN bus.

If the limit switch trips at the start of the heating cycle

during the evaporator on delay, the time period of the on

delay for the next cycle will be 5 seconds less than the

time at which the switch tripped. (Example: If the limit

switch trips at 30 seconds, the evaporator-fan on delay for

the next cycle will occur at 25 seconds.) To prevent

short-cycling, a 5-second reduction will only occur if a

minimum of 10 minutes has elapsed since the last call for

heating.

Initial Operation and Test

Perform the following procedure:

1. Apply 24 vac power to the control.

2. Connect the service tool to the phone jack service

port of the controller.

3. Using the Service Tool, upload the controller from

address 0, 31 at 9600 baud rate. The address may be

set at this time. Make sure that Service Tool is

connected to only one unit when changing the

address.

The evaporator-fan off delay can also be modified. Once

the call for heating has ended, there is a 10-minute period

during which the modification can occur. If the limit

switch trips during this period, the evaporator-fan off

delay will increase by 15 seconds. A maximum of 9 trips

can occur, extending the evaporator-fan off delay to 180

seconds.

Memory Reset

To restore the original default value, reset the power to the

unit.

DIP switch 4 causes an E-squared memory reset to

factory defaults after the switch has been moved from

position 0 to position 1 and the power has been restored.

To enable the feature again, the switch must be put back

to the 0 position and power must be restored; this prevents

subsequent resets to factory defaults if the switch is left at

position 1.

To shut off unit, set system selector switch at OFF

position. Resetting heating selector lever below room

temperature will temporarily shut unit off until space

temperature falls below thermostat setting.

Ventilation (Continuous Fan)

To cause a reset of the non-volatile memory (to factory

defaults), turn the controller power off if it is on, move the

switch from position 1 to position 0, and then apply power

to the controller for a minimum of 5 seconds. At this

point, no action occurs, but the controller is now ready for

the memory to reset. Remove power to the controller

again and move the switch from position 0 to position 1.

This time, when power is applied, the memory will reset

to factory defaults. The controller address will return to

bus 0 element 31, indicating that memory reset occurred.

Set fan and system selector switches at ON and OFF

positions, respectively. Evaporator fan operates

continuously to provide constant air circulation. When the

evaporator-fan selector switch is turned to the OFF

position, there is a 30-second delay before the fan turns

off.

START--UP, PREMIERLINKt CONTROLS

Use the Carrier network communication software to start

up and configure the PremierLink controller.

Refer to Rooftop PremierLink Installation, Start-Up, and

Configuration Instructions (Form 33CS-58SI) for full

discussion on configuring the PremierLink control system.

Changes can be made using the ComfortWORKSr

software, ComfortVIEWt software, Network Service

Tool, System Pilott device, or Touch Pilott device. The

System Pilot and Touch Pilot are portable interface

devices that allow the user to change system set-up and

setpoints from a zone sensor or terminal control module.

During start-up, the Carrier software can also be used to

verify communication with PremierLink controller.

Field Service Test, explained below, will assist in proper

start-up. Configuration of unit parameters, scheduling

options, and operation are also discussed in this section.

Field Service Test

The Field Service Test function can be used to verify

proper operation of compressors, heating stages, indoor

NOTE: All set-up and setpoint configurations are factory

set and field-adjustable.

For specific operating instructions, refer to the literature

provided with user interface software.

fan,

power

exhaust

fans,

economizer,

and

dehumidification. Use of Field Service Test is

recommended at initial system start up and during

troubleshooting. See RTU-MP Controls, Start-Up,

Operation, and Troubleshooting Instructions (Form

48-50H-T-2T), Appendix A for Field Service Test Mode

table.

Perform System Check--Out

1. Check correctness and tightness of all power and

communication connections.

Field Service Test mode has the following changes from

normal operation:

S Outdoor air temperature limits for cooling circuits,

Filter Service Hours

This refers to the timer set for the Dirty Filter Alarm.

After the number of runtime hours set on this point is

exceeded the corresponding alarm will be generated, and

must be manually cleared on the alarm reset screen after

the maintenance has been completed. The timer will then

begin counting its runtime again for the next maintenance

interval.

Factory Default = 600 hr

NOTE: Setting this configuration timer to 0, disables the

alarm.

economizer, and heating are ignored.

S Normal compressor time guards and other staging delays

are ignored.

S The status of Alarms (except Fire and Safety chain) is

ignored but all alerts and alarms are still broadcasted on

the network.

Field Service Test can be turned ON/OFF at the unit

display or from the network. Once turned ON, other

entries may be made with the display or through the

network. To turn Field Service Test on, change the value

of Test Mode to ON, to turn Field Service Test off, change

the value of Test Mode to OFF.

NOTE: Service Test mode is password protected when

accessing from the display. Depending on the unit model,

factory-installed options, and field-installed accessories,

some of the Field Service Test functions may not apply.

Supply Fan Service Hours

This refers to the timer set for the Supply Fan Runtime

Alarm. After the number of runtime hours set on this point

is exceeded the corresponding alarm will be generated,

and must be manually cleared on the alarm reset screen

after the maintenance has been completed. The timer will

then begin counting its runtime again for the next

maintenance interval.

The independent outputs (IndpOutputs) submenu is used

to change output status for the supply fan, economizer,

and Power Exhaust. These independent outputs can

operate simultaneously with other Field Service Test

modes. All outputs return to normal operation when Field

Service Test is turned off.

The Cooling submenu is used to change output status for

the individual compressors and the dehumidification relay.

Compressor starts are not staggered. The fans and heating

service test outputs are reset to OFF for the cooling

service test. Indoor fans and outdoor fans are controlled

normally to maintain proper unit operation. All normal

cooling alarms and alerts are functional.

NOTE: Circuit A is always operated with Circuit B due

to outdoor fan control on Circuit A. Always test Circuit A

first, and leave it on to test other Circuits.

The Heating submenu is used to change output status for

the individual heat stages, gas or electric. The fans and

cooling service test outputs are reset to OFF for the

heating service test. All normal heating alarms and alerts

are functional.

Factory Default = 0 hr

NOTE: Setting this configuration timer to 0, disables the

alarm.

Compressor1 Service Hours

This refers to the timer set for the Compressor 1 Runtime

Alarm. After the number of runtime hours set on this point

is exceeded the corresponding alarm will be generated,

and must be manually cleared on the alarm reset screen

after the maintenance has been completed. The timer will

then begin counting its runtime again for the next

maintenance interval.

NOTE: Setting this configuration timer to 0, disables the

Factory Default = 0 hr

alarm.

Compressor2 Service Hours

This refers to the timer set for the Compressor 2 Runtime

Alarm. After the number of hours set on this point is

exceeded the corresponding alarm will be generated, and

must be manually cleared on the alarm rest screen after

the maintenance has been completed. The timer will then

begin counting its runtime again for the next maintenance

interval

Configuration

Factory Default = 0 hr

NOTE: Setting this configuration timer to 0, disables the

The RTU-MP controller configuration points affect the

unit operation and/or control. Review and understand the

meaning and purpose of each configuration point before

changing it from the factory default value. The submenus

containing configuration points are as follows: Unit,

Cooling, Heating, Inputs, Economizer, IAQ, Clock-Set,

and User Password (USERPW). Each configuration point

is described below under its according submenu. See

alarm.

Cooling

Number of Compressor Stages

This refers to the number of mechanical cooling stages

available on a specific unit. Set this point to “One Stage”

if there is one compressor in the specific unit, set to “Two

Stage” if there are two compressors in the unit, and set to

“None” if economizer cooling ONLY is desired.

RTU-MP

Controls,

Start-Up,

Operation,

and

Troubleshooting Instructions (Form 48-50H-T-2T),

Appendix for display tables.

Factory Default = One Stage for 1 compressor units

Two Stage for 2 compressor units

Unit

Start Delay

This refers to the time delay the unit will wait after power

up before it pursues any specific operation.

Factory Default = 5 sec

Range = 0-600 sec

Cooling/Econ SAT Low Setpt

Input 5

The supply air temperature must remain above this value

to allow cooling with the economizer and/or compressors.

There is 5_F plus and minus deadband to this point. If the

SAT falls below this value during cooling, all compressors

will be staged off. The economizer will start to ramp

down to minimum position when the SAT = this

configuration +5_F.

This input is a discrete input and can be configured to be

one of five different inputs: No Function, Fire Shutdown,

Fan Status, Filter Status, or Remote Occupancy. This

input can also be configured to be either Normally Open

(N/O) or Normally Closed (N/C). Input 5 is factory wired

to pin J1-10. Field accessories get wired to its parallel pin

J5-3. Do not connect inputs to both locations, one

function per input.

Factory Default = 50_F

Range = 45-75_F

Factory Default = Fire Shutdown and N/C

NOTE: Fire Shutdown input comes from TB4-7. J1-10

is always factory wired to TB4-7. Only change input 5s

function if absolutely needed.

Cooling Lockout Temp

This defines the minimum outdoor air temperature that

cooling mode can be enabled and run. If the OAT falls

below this threshold during cooling, then compressor

cooling will not be allowed.

Input 8

This input is a discrete input and can be configured to be

one of five different inputs: No Function, Enthalpy

Switch, Fan Status, Filter Status, or Remote Occupancy.

This input can also be configured to be either Normally

Open (N/O) or Normally Closed (N/C). Input 8 is factory

wired to pin J2-6. Field accessories get wired to its

parallel pin J5-1. Do not connect inputs to both locations,

one function per input.

Factory Default = 45_F

Range = 0-65_F

Heating

Heating SAT High Setpt

The supply air temperature must remain below this value

to allow heating. There is 5_F plus and minus deadband to

this point. If the SAT rises above this value during heating

the heat stages will begin to decrease until the SAT has

dropped below this value.

Factory Default = No Function and N/O

Input 9

This input is a discrete input and can be configured to be

one of five different inputs: No Function, Humidistat, Fan

Status, Filter Status, or Remote Occupancy. This input can

also be configured to be either Normally Open (N/O) or

Normally Closed (N/C). Input 9 is factory and field wired

to pin J5-7. Do not connect inputs to both locations, one

function per input.

Factory Default = 120_F

Range = 95-150_F

Heating Lockout Temp

This defines the maximum outdoor air temperature that

heating mode can be enabled and run. If the OAT rises

above this threshold during heating, then heating will not

be allowed.

Factory Default = Humidistat and N/O

Factory Default = 65_F

Range = 49-95_F

Space Sensor Type

This tells the controller what type of space sensor is

installed to run the unit. The three types that can be used

are the T55 space sensor, the T56 space sensor, or the RS

space sensor.

Inputs

NOTE: For installation of inputs and field installed

accessories, refer to the appropriate sections.

Input 3

Factory Default = T55 Type

This input is a discrete input and can be configured to be

one of five different inputs: No Function, Compressor

Safety, Fan Status, Filter Status, or Remote Occupancy.

This input can also be configured to be either Normally

Open (N/O) or Normally Closed (N/C). Input 3 is factory

wired to pin J1-2. Field accessories get wired to its

parallel pin J5-5. Do not connect inputs to both locations,

one function per input.

Input 1 Function

This input is an analog input and can be configured to be

one of five different inputs: No Sensor, IAQ Sensor, OAQ

Sensor, Space RH Sensor, or Outdoor RH Sensor. Input 1

is wired to pin J4-5.

Factory Default = No Sensor

Input 2 Function

This input is an analog input and can be configured to be

one of five different inputs: No Sensor, IAQ Sensor, OAQ

Sensor, Space RH Sensor, or Outdoor RH Sensor. Input 2

is wired to pin J4-2.

Factory Default = Compressor Safety and N/O

NOTE: Compressor Safety input comes from the CLO

board. J1-2 is always factory wired to TB1-8 (X) terminal

on the unit. If the unit has a CLO board, do not configure

input 3 for anything but Compressor Safety.

Factory Default = No Sensor

Setpoint Slider Range

This sets the slider range of the space sensor (with this

built in function). The slider is used to offset the current

control setpoint.

Factory Default = 5 n_F

Range = 0-15 n_F

T55/56 Override Duration

Power Exhaust Setpt

This sets the occupancy override duration when the

override button is pushed on the space sensor.

When the economizer damper position opens above this

point the power exhaust operation will begin. When the

damper position falls 10% below the setpoint, the power

exhaust will shutdown.

Factory Default = 1 hr

Range = 0-24 hr

Factory Default = 50%

Range = 20-90 %

NOTE: This point is only used when Continuous Occ

IAQ Low Reference @ 4mA

This is used when an IAQ sensor is installed on Input 1 or

2. This value is displayed and used when 4mA is seen at

the input.

Exhaust = NO

Continuous Occ Exhaust

Factory Default = 0 PPM

Range = 0-400 PPM

This point tells the controller when to run the power

exhaust if equipped on the unit. If set to YES, the power

exhaust will be on all the time when in occupied mode

and will be off when in unoccupied mode. If set to NO the

power exhaust will be controlled by the Power Exhaust

Setpoint.

IAQ High Reference @ 20mA

This is used when an IAQ sensor is installed on Input 1 or

2. This value is displayed and used when 20mA is seen at

the input.

Factory Default = 2000 PPM

Range = 0-5000 PPM

NOTE: IAQ low Reference @ 4mA and IAQ High

Reference @ 20mA are used to set the linear curve of mA

vs. PPM.

Factory Default = NO

IAQ

Max Differential CO₂Setpt

If the difference between indoor an outdoor air quality

becomes greater then this value the damper position will

stay at the IAQ Greatest Min Dmpr Pos. configuration

point

OAQ Low Reference @ 4mA

This is used when an OAQ sensor is installed on Input 1

or 2. This value is displayed and used when 4mA is seen

at the input.

Factory Default = 650 PPM

Range = 300-950 PPM

Factory Default = 0 PPM

Range = 0-400 PPM

IAQ Greatest Min Dmpr Pos.

This is the greatest minimum position the economizer will

open to while trying to control the indoor air quality, CO₂

differential.

OAQ High Reference @ 20mA

This is used when an OAQ sensor is installed on Input 1

or 2. This value is displayed and used when 20mA is seen

at the input.

Factory Default = 50% open

Range = 10-60% open

Factory Default = 2000 PPM

Range = 0-5000 PPM

Clockset

This submenu screen allows you to set the date and time

manually. The Daylight Savings Time (DST) can also be

changed here. The date and time is automatically set when

ever software is downloaded. The clock is a 24 hour clock

and not am/pm. The time should be verified (and maybe

changed) according to unit location and time zone.

NOTE: OAQ low Reference @ 4mA and OAQ High

Reference @ 20mA are used to set the linear curve of mA

vs. PPM.

Economizer

Economizer Exists

This point tells the controller if there is an economizer

installed on the unit.

Factory Default = Eastern Standard Time

USERPW

Factory Default = NO if no economizer

YES if there is an economizer installed

This submenu screen allows you to change the user

password to a four number password of choice. The User

password change screen is only accessible with the

Administrator Password (1111). The ADMIN password

will always override the user password.

Economizer Minimum Position

This defines the lowest economizer position when the

indoor fan is running and the building is occupied.

Factory Default = 20%

Range = 0-100 %

Economizer High OAT Lockout

If the outdoor air temperature rises above this value,

economizer cooling will be disabled and dampers will

return and stay at minimum position.

Factory Default = 75_F

Range = 55-80_F

When free cooling is available as determined by the

appropriate changeover command (dry bulb, outdoor

enthalpy, differential dry bulb or differential enthalpy), a

call for cooling (Y1 closes at the thermostat) will cause

the economizer control to modulate the dampers open and

closed to maintain the unit supply air temperature at 50 to

55_F. Compressor will not run.

OPERATING SEQUENCES

Base Unit Controls

Cooling, Units Without Economizer

When thermostat calls for Stage 1 cooling, terminals G

and Y1 are energized. The indoor-fan contactor (IFC),

outdoor fan contactor (OFC) and Compressor 1 contactor

(C1) are energized and indoor-fan motor, outdoor fan and

During free cooling operation, a supply air temperature

(SAT) above 50_F will cause the dampers to modulate

between Minimum Position setpoint and 100% open. With

SAT from 50_F to 45_F, the dampers will maintain at the

Minimum Position setting. With SAT below 45_F, the

outside air dampers will be closed. When SAT rises to

48_F, the dampers will re-open to Minimum Position

setting.

Compressor

start. The outdoor fan motor runs

continuously while unit is in Stage 1 or Stage 2 cooling.

(D08 and D12 units have two outdoor fans; both run while

unit is in Stage 1 or Stage 2 cooling.)

If Stage 1 cooling does not satisfy the space load , the

space temperature will rise until thermostat calls for Stage

2 cooling (Y2 closes). Compressor 2 contactor (C2) is

energized; Compressor 2 starts and runs.

Should 100% outside air not be capable of satisfying the

space temperature, space temperature will rise until Y2 is

closed. The economizer control will call for compressor

operation. Dampers will modulate to maintain SAT at 50

to 55_F concurrent with Compressor 1 operation. The

Low Ambient Lockout Thermostat will block compressor

operation with economizer operation below 42_F outside

air temperature.

Heating, Units Without Economizer

When the thermostat calls for heating, terminal W1 is

energized. To prevent thermostat short-cycling, the unit is

locked into the Heating mode for at least 1 minute when

W1 is energized. The induced-draft motor is energized

and the burner ignition sequence begins. The indoor

(evaporator) fan motor (IFM) is energized 45 seconds

after a flame is ignited.

When space temperature demand is satisfied (thermostat

Y1 opens), the dampers will return to Minimum Damper

position if indoor fan is running or fully closed if fan is

off.

If Stage 1 heating does not satisfy the space load, the

space temperature will fall until thermostat calls for Stage

2 heating (W2 closes). Terminal W2 is energized and the

high-fire solenoid on the main gas valve (MGV) is

energized. Firing rate increases to high-fire. When space

load is partially satisfied, terminal W2 is deenergized; the

high-fire solenoid is deenergized and heating operation

continues on low-fire.

If accessory power exhaust is installed, the power exhaust

fan motors will be energized by the economizer control as

the dampers open above the PE-On setpoint and will be

de- -energized as the dampers close below the PE-On

setpoint.

Damper movement from full closed to full open (or vice

versa) will take between 1-1/2 and 2-1/2 minutes.

When the space heating load is fully satisfied, thermostat

terminal W1 is also deenergized. All heating operations

cease. The IFM stops after a 45-second time off delay.

Heating With EconoMi$er IV

During Occupied mode operation, indoor fan operation

will be accompanied by economizer dampers moving to

Minimum Position setpoint for ventilation. If indoor fan is

off, dampers will close. During Unoccupied mode

operation, dampers will remain closed unless a DCV

demand is received.

Cooling, Unit With EconoMi$er IV

For Occupied mode operation of EconoMi$er IV, there

must be a 24-v signal at terminals TR and N (provided

through PL6-3 from the unit’s IFC coil). Removing the

signal at N places the EconoMi$er IV control in

Unoccupied mode.

When the room temperature calls for heat (W1 closes), the

heating controls are energized as described in Heating,

Unit Without Economizer above.

During Occupied mode operation, indoor fan operation

will be accompanied by economizer dampers moving to

Minimum Position setpoint for ventilation. If indoor fan is

off, dampers will close. During Unoccupied mode

operation, dampers will remain closed unless a Cooling

(by free cooling) or DCV demand is received.

Demand Controlled Ventilation

If a field-installed CO2 sensor is connected to the

Economize IV control, a Demand Controlled Ventilation

strategy will operate automatically. As the CO2 level in

the space increases above the setpoint (on the EconoMi$er

IV controller), the minimum position of the dampers will

be increased proportionally, until the Maximum

Ventilation setting is reached. As the space CO2 level

decreases because of the increase in fresh air, the

outdoor-damper will follow the higher demand condition

from the DCV mode or from the free-cooling mode.

When free cooling using outside air is not available, the

unit cooling sequence will be controlled directly by the

space thermostat as described above as Cooling, Unit

Without Economizer. Outside air damper position will be

closed or Minimum Position as determined by occupancy

mode and fan signal.

DCV operation is available in Occupied and Unoccupied

periods with EconoMi$er IV. However, control

modification will be required on the 48TC unit to

implement the Unoccupied period function.

Cooling — For cooling operation, there must be 24 vac

present on G. When G is active, the PremierLink

controller will then determine if outdoor conditions are

suitable for economizer cooling when an economizer

damper is available. A valid OAT, SPT (CCN space

temperature) and SAT (supply air temperature) sensor

MUST be installed for proper economizer operation. It

recommended that an outdoor or differential enthalpy

sensor also be installed. If one is not present, then a

jumper is needed on the ENTH input on J4, which will

indicate that the enthalpy will always be low. Economizer

operation will be based only on outdoor air dry bulb

temperature. The conditions are suitable when: enthalpy is

low, OAT is less than OATL High Lockout for TSTAT,

and OAT is less than OATMAX, the high setpoint for free

cooling. The default for OATL is 65_F. The default for

OATMAX is 75_F.

Supplemental Controls

Compressor Lockout Relay (CLO) - The CLO is available

as a factory-installed option or as a field-installed

accessory. Each compressor has a CLO. The CLO

compares the demand for compressor operation (via a

24-v input from Y at CLO terminal 2) to operation of the

compressor (determined via compressor current signal

input at the CLO’s current transformer loop); if the

compressor current signal is lost while the demand input

still exists, the CLO will trip open and prevent the

compressor from restarting until the CLO has been

manually reset. In the lockout condition, 24-v will be

available at terminal X. Reset is accomplished by

removing the input signal at terminal 2; open the

thermostat briefly or cycle the main power to the unit.

When all of the above conditions are satisfied and all the

required sensors are installed, the PremierLink controller

will use the economizer for cooling. One of three different

control routines will be used depending on the

temperature of the outside air. The routines use a PID loop

to control the SAT to a supply air setpoint (SASP) based

on the error from setpoint (SASPSAT). The SASP is

determined by the routine.

Phase Monitor Relay (PMR) - The PMR protects the unit

in the event of a loss of a phase or a reversal of power line

phase in the three-phase unit power supply. In normal

operation, the relay K1 is energized (contact set closed)

and red LED indicator is on steady. If the PMR detects a

loss of a phase or a phase sequence reversal, the relay K1

is energized, its contact set is opened and unit operation is

stopped; red LED indicator will blink during lockout

condition. Reset of the PMR is automatic when all phases

are restored and phase sequence is correct. If no 24-v

control power is available to the PMR, the red LED will

be off. Smoke Detectors - Factory-installed smoke

detectors are discussed in detail starting on page 17.

If an economizer is not available or the conditions are not

met for the following economizer routines below, the

compressors 1 and 2 will be cycled based on Y1 and Y2

inputs respectively.

Any time the compressors are running, the PremierLink

controller will lock out the compressors if the SAT

becomes too low. These user configurable settings are

found in the SERVICE configuration table:

PremierLinkt Control

Compressor 1 Lockout at SAT < SATLO1 (50 to 65_F)

(default is 55_F)

THERMOSTAT MODE — If the PremierLink controller

is configured for Thermostat mode (TSTAT), it will

control only to the thermostat inputs on J4. These inputs

can be overridden through CCN communication via the

CV_TSTAT points display table. When in this mode, the

fire safety shutdown (FSD) input cannot be used, so any

fire/life safety shutdown must be physically wired to

disable the 24 vac control circuit to the unit.

Compressor 2 Lockout at SAT < SATLO2 (45 to 55_F)

(default is 50_F)

After a compressor is locked out, it may be started again

after a normal time-guard period and the supply-air

temperature has increased at least 8_F above the lockout

setpoint.

Indoor Fan — The indoor fan output will be energized

whenever there is 24 vac present on the G input. The

indoor fan will be turned on without any delay and the

economizer damper will open to its minimum position if

the unit has a damper connected to the controller. This

will also occur if the PremierLink controller has been

configured for electric heat or heat pump operation.

Routine No. 1: If the OAT ≤ DXLOCK (OAT DX lockout

temperature) and DX Cooling Lockout is enabled when

Y1 input is energized, the economizer will be modulated

to maintain SAT at the Supply Air Setpoint (SASP) =

SATLO1 + 3_F (Supply Air Low Temp lockout for

compressor 1). When Y2 is energized, the economizer

will be modulated to control to a lower SASP = SATLO2

+ 3_F (Supply Air Low Temp lockout for compressor no.

2). Mechanical cooling is locked out and will not be

energized.

Routine No. 2: If DXLOCK (or DX Cooling Lockout is

disabled) < OAT ≤ 68_F when Y1 input is energized, the

economizer will be modulated to maintain SAT at SASP =

SATLO1 + 3_F. If the SAT > SASP + 5_F and the

economizer position > 85% then the economizer will

close the to minimum position for three minutes or until

the SAT > 68_F. The economizer integrator will then be

reset and begin modulating to maintain the SASP after

stage one has been energized for 90 seconds.

As air quality within the space changes, the minimum

position of the economizer damper will be changed also

thus allowing more or less outdoor air into the space

depending on the relationship of the IAQI to the IAQS.

The IAQ algorithm runs every 30 seconds and calculates

IAQ minimum position value using a PID loop on the

IAQI deviation from the IAQS. The IAQ minimum

position is then compared against the user configured

minimum position (MDP) and the greatest value becomes

the final minimum damper position (IQMP). If the

calculated IAQ Minimum Position is greater than the IAQ

maximum damper position (IAQMAXP) decision in the

SERVICE configuration table, then it will be clamped to

IAQMAXP value.

When Y2 is energized, the economizer will be modulated

to control to a lower supply air setpoint SASP= SATLO2

+ 3_F If the SAT > SASP + 5_F it will close the

economizer to minimum position for 3 minutes, reset the

integrator for the economizer, then start modulating the

economizer to maintain the SASP after the stage two has

been on for 90 seconds. This provides protection for the

compressor against flooded starts and allow refrigerant

flow to stabilize before modulating the economizer again.

By using return air across the evaporator coil just after the

compressor has started allows for increased refrigerant

flow rates providing better oil return of any oil washed out

during compressor start-up.

If IAQ is configured for low priority, the positioning of

the economizer damper can be overridden by comfort

requirements. If the SAT < SASP -8_F and both stages of

heat are on for more then 4 minutes or the SAT > SASP +

5_F and both stages of cooling on for more then 4 minutes

then the IAQ minimum damper position will become 0

and the IQMP = MDP. IAQ mode will resume when the

SAT > SASP -8_F in heating or the SAT < SASP + 5_F in

cooling.

Routine No. 3: If the OAT > 68_F and the enthalpy is low

and the OAT < SPT then the economizer will open to

100% and compressors 1 and 2 will be cycled based on

Y1 and Y2 inputs respectively. If any of these conditions

are not met the economizer will go to minimum position.

If the PremierLink controller is configured for 1 stage of

heat and cool or is only using a single stage thermostat

input, this function will not work as it requires the both

Y1 and Y2 or W1 and W2 inputs to be active. In this

application, it is recommended that the user configure

IAQ priority for high.

If there is no call for heating or cooling, the economizer,

if available, will maintain the SASP at 70_F.

If IAQ is configured for high priority and the OAT < 55_F

and the SAT < (SPT -10_F), the algorithm will enable the

heat stages to maintain the SAT between the SPT and the

SPT + 10_F.

Heating — For gas or electric heat, HS1 and HS2 outputs

will follow W1 and W2 inputs respectively. The fan will

also be turned on if it is configured for electric heat.

Heating may also be energized when an IAQ sensor

installed and has overridden the minimum economizer

damper position. If the OAT < 55_F and an IAQ sensor is

installed and the IAQ minimum position > minimum

damper position causing the SAT to decrease below the

SPT - 10_F, then the heat stages will be cycled to temper

the SAT to maintain a temperature between the SPT and

the SPT + 10_F.

CCN SENSOR MODE — When the PremierLink

controller is configured for CCN control, it will control

the compressor, economizer and heating outputs based its

own space temperature input and setpoints or those

received from Linkage. An optional CO₂IAQ sensor

mounted in the space or received through communications

can also influence the economizer and heating outputs.

The PremierLink controller does not have a hardware

clock so it must have another device on the CCN

communication bus broadcasting time. The controller will

maintain its own time once it has received time as long as

it has power and will send a request for time once a

minute until it receives time when it has lost power and

power is restored. The controller will control to

unoccupied setpoints until it has received a valid time.

The controller must have valid time in order to perform

any broadcast function, follow an occupancy schedule,

perform IAQ pre-occupancy purge and many other

functions as well. The following sections describe the

operation for the functions of the PremierLink controller.

Auxiliary Relay configured for Exhaust Fan — If the

Auxiliary Relay is configured for exhaust fan (AUXOUT

= 1) in the CONFIG configuration table and Continuous

Power Exhaust (MODPE) is enable in the SERVICE

configuration table then the output (HS3) will be

energized whenever the G input is on. If the MODPE is

disabled then output will be energized based on the Power

Exhaust Setpoint (PES) in the SETPOINT table.

Indoor Air Quality — If the optional indoor air quality

(IAQI) sensor is installed, the PremierLink controller will

maintain indoor air quality within the space at the

user-configured differential setpoint (IAQD) in the

CONFIG configuration table. The setpoint is the

difference between the IAQI and an optional outdoor air

quality sensor (OAQ). If the OAQ is not present then a

fixed value of 400 ppm is used. The actual space IAQ

setpoint (IAQS) is calculated as follows:

IAQS = IAQD + OAQ (OAQ = 400 ppm if not present)

Indoor Fan — The indoor fan will be turned on whenever

any one of the following conditions are met:

Cooling — The compressors are controlled by the Cooling

Control Loop that is used to calculate the desired SAT

needed to satisfy the space. It will compare the SPT to the

Occupied Cool Setpoint (OCSP) + the T56 slider offset

(STO) when occupied and the Unoccupied Cool Setpoint

(UCSP + Unoccupied Cooling Deadband) if unoccupied

to calculate a Cooling Submaster Reference (CCSR) that

is then used by the staging algorithm (Cooling submaster

loop) to calculate the required number of cooling stages.

The economizer, if available, will be used as the first

stage of cooling in addition to the compressors. This loop

runs every minute. The following conditions must be met

in order for this algorithm to run:

S If the PremierLink controller is in the occupied mode and

ASHRAE 90.1 Supply Fan is configured for Yes in the

CONFIG table. This will be determined by its own

internal occupancy schedule if it is programmed to

follow its local schedule or broadcast its local schedule as

a global schedule, or following a global schedule

broadcast by another device.

S If PremierLink controller is in the occupied mode and

ASHRAE 90.1 Supply Fan is configured for No and there

is a heat or cool demand (fan auto mode)

S If the PremierLink controller is in the occupied mode and

ASHRAE 90.1 Supply Fan is configured for Yes when

Linkage is active and the Linkage Coordinator device is

sending an occupied mode flag

S indoor fan has been ON for at least 30 seconds

S heat mode is not active and the time guard between

modes equals zero.

S mode is occupied or the Temperature Compensated Start

or Cool mode is active

S When Temperature Compensated Start is active

S When Free Cool is active

S SPT reading is available and > (OCSP + STO)

S When Pre-Occupancy Purge is active

S If mode is unoccupied and the SPT > (UCSP +

Unoccupied Cooling Deadband). The indoor fan will be

turned on by the staging algorithm.

S Whenever there is a demand for cooling or heating in the

unoccupied mode

S Whenever the Remote Contact input is configured for

Remote Contact (RC_DC=1 in SERVICE table) and it is

closed or the point is forced Closed via communications

in the STATUS01 points display table (remote contact

closed = occupied, remote contact open = unoccupied)

S OAT > DXLOCK or OAT DX Lockout is disabled

If all of the above conditions are met, the CCSR will be

calculated, otherwise it is set to its maximum value and

DX stages is set to 0. If only the last condition is not true

and an economizer is available, it will be used to cool the

space.

S Whenever the H3_EX_RV point is configured for

Dehumidification (AUXOUT=5 in CONFIG table) and it

is in the unoccupied mode and the indoor RH exceeds the

unoccupied humidity setpoint

The submaster loop uses the CCSR compared to the actual

SAT to determine the required number of capacity stages

to satisfy the load. There is a programmable minimum

internal time delay of 3 to 5 minutes on and 2 to 5 minutes

off for the compressors to prevent short cycling. There is

also a 3-minute time delay before bringing on the second

stage compressor. If the PremierLink controller is

configured for Heat Pump and AUXOUT is configured for

Reversing Valve Cool, the H3_EX_RV output will

energize 2 seconds after the first compressor is energized

and stay energized until there is a demand for heat. If

AUXOUT is configured for Reversing Valve Heat, then

the H3_EX_RV contact will be deenergized when there is

a demand for cooling. An internal 5 to 10-minute

user-programmable time guard between modes prevents

rapid cycling between modes when used in a single zone

application. The Time Guard is lowered to 3 minutes

when Linkage is active to allow the 3Vt linkage

coordinator to have better control of the PremierLink

controller when used as the air source for the 3V control

system.

S Whenever the Supply Fan Relay point is forced On in the

STATUS01 points display table

The fan will also continue to run as long as compressors

are on when transitioning from occupied to unoccupied

with the exception of Fire Shutdown mode. If the Fire

Shutdown input point is closed or forced in the

STATUS01 points display table, the fan will be shutdown

immediately regardless of the occupancy state or demand.

The PremierLink controller has an optional Supply Fan

Status input to provide proof of airflow. If this is enabled,

the point will look for a contact closure whenever the

Supply Fan Relay is on. If the input is not enabled, then it

will always be the same state as the Supply Fan Relay.

The cooling, economizer and heating routines will use this

input point for fan status.

Table 30 indicates the number of stages available. The

staging algorithm looks at the number of stages available

based the number of cool stages configured in the

SERVICE configuration table. The algorithm will skip the

economizer if it is not available and turn on a compressor.

Table 30 – Available Cooling Stages

Economizer — The economizer dampers are used to

provide free cooling and indoor air quality if optional CO₂

sensor is installed and when the outside conditions are

suitable. Temperature control is accomplished by

controlling the SAT to a certain level determined by the

Economizer PID Loop by calculating a submaster

reference (ECONSR) value. This algorithm will calculate

the submaster reference temperature (ECONSR) based on

OAT and enthalpy conditions and cooling requirements.

The ECONSR value is then passed to the Economizer

Submaster Loop, which will modulate dampers to

maintain SAT at ECONSR level.

NUMBER OF

STAGES

(ECONOMIZER*)

Compressor 1

Compressor 2

Off

If conditions are suitable for economizer operation.

Any time the compressors are running, the PremierLink

controller will lockout the compressors if the SAT

becomes too low. These user configurable settings are

found in the SERVICE configuration table:

Compressor 1 Lockout at SAT < SATLO1 (50 to 65_F)

(default is 55_F)

The following conditions are required to determine if

economizer cooling is possible:

Compressor 2 Lockout at SAT < SATLO2 (45 to 55_F)

(default is 50_F)

S Indoor fan has been on for at least 30 seconds

S Enthalpy is low

After a compressor is locked out, it may be started again

after a normal time-guard period and the supply air

temperature has increased at least 8_F above the lockout

setpoint.

S SAT reading is available

S OAT reading is available

S SPT reading is available

S OAT ≤ SPT

Dehumidification — The PremierLink controller will

provide occupied and unoccupied dehumidification

control when AUXOUT = 5 in the CONFIG table and is

installed on HVAC units that are equipped with additional

controls and accessories to accomplish this function. This

function also requires a space relative humidity sensor be

installed on the OAQ/IRH input.

S OAT < OATMAX (OATMAX default is 75_F)

S Economizer position is NOT forced

If any of the above conditions are not met, the ECONSR

will be set to its MAX limit of 120_F and the damper will

go to its configured minimum position. The minimum

damper position can be overridden by the IAQ routine

described later in this section.

When in the occupied mode and the indoor relative

humidity is greater then the Occupied High Humidity

setpoint, then the H3_EX_RV output point will be

energized. When in the unoccupied mode and indoor

relative humidity is greater then the Unoccupied High

Humidity setpoint, then the H3_EX_RV output point and

supply fan output will be energized. There is a fixed 5%

hysteresis that the indoor relative humidity must drop

below the active setpoint to end the dehumidification

mode and deenergize the H3_EX_RV output. If the

PremierLink controller is in the unoccupied mode, then

the fan relay will deenergize if there is no other mode

requiring to the fan to be on. This function will not

energize mechanical cooling as a result of the indoor

relative humidity exceeding either setpoint.

The calculation for ECONSR is as follows:

ECONSR = PID function on (setpoint - SPT), where:

setpoint = ((OCSP+STO) + (OHSP+STO))/2 when

NTLO (Unoccupied Free Cool OAT Lockout) < OAT <

68_F

setpoint = (OCSP+STO) - 1 when OAT ≤ NTLO

setpoint = (OHSP+STO) + 1 when OAT ≥ 68_F

The actual damper position (ECONPOS) is the result of

the following calculation. Values represented in the right

side of the equation can be found in the SERVICE

configuration table descriptions in this manual. Note that

that the OAT is taken into consideration to avoid large

changes in damper position when the OAT is cold:

A high humidity alarm will be generated if the indoor

relative humidity exceeds the high humidity setpoint by

the amount configured in the Control Humidity Hysteresis

in the ALARMS table for 20 minutes. The alarm will

return to normal when the indoor relative humidity drops

3% below the active humidity setpoint.

ECONPOS = SubGain x (ECONSR-SAT) + CTRVAL

where SubGain = (OAT - TEMPBAND) / (ESG + 1)

If the OAT < DXLOCK (DX Cool Lockout setpoint) then

the damper will be modulated to maintain the SAT at the

ECONSR value.

If the OAT is between DXLOCK and 68_F (DXLOCK <

OAT < 68_F) and additional cooling is required, the

economizer will close the to minimum position for three

minutes, the economizer integrator will then be reset to 0

and begin modulating to maintain the SASP after the stage

has been energized for about 90 seconds. This will allow

the economizer to calculate a new ECONSR that takes

into account the cooling effect that has just been turned on

and not return to the value require before the cooling was

added. This will prevent the economizer from causing

premature off cycles of compressors while maintaining the

low SAT temperature setpoint for the number of stages

active. In addition to preventing compressor short cycling,

by using return air across the evaporator coil just after the

compressor has started allows for increased refrigerant

flow rates providing for better oil return of any oil washed

out during compressor start-up.

The Staged Heat Submaster Reference (SHSR) is

calculated as follows:

SHSR = Heating PID function on (error) where error =

(OHSP + STO) - Space Temperature

The Maximum SHSR is determined by the SATHI

configuration. If the supply-air temperature exceeds the

SATHI configuration value, then the heat stages will turn

off. Heat staging will resume after a delay to allow the

supply-air temperature to drop below the SATHI value.

The maximum number of stages available is dependent on

the type of heat and the number of stages programmed in

the CONFIG and SERVICE configuration tables. Staging

will occur as follows for gas electric units, Carrier heat

pumps with a defrost board, or cooling units with electric

heat:

For Heating PID STAGES = 2

If the OAT > 68_F and OAT < SPT and the number of DX

stages requested is > 0 by the staging algorithm, then

ECONSR is set to its minimum value 48_F and the

damper will go to 100% open.

HEAT STAGES = 1 (50% capacity) - energize HS1.

HEAT STAGES = 2 (100% capacity) - energize HS2.

For Heating PID STAGES = 3 and AUXOUT = HS3

HEAT STAGES = 1 (33% capacity if) - energize HS1

HEAT STAGES = 2 (66% capacity) - energize HS2

HEAT STAGES = 3 (100% capacity) - energize HS3

If the Auxiliary Relay is configured for exhaust fan

(AUXOUT = 1) in the CONFIG configuration table and

Continuous Power Exhaust (MODPE) is Enable in the

SERVICE configuration table, then the AUXO output

(HS3) will be energized whenever the PremierLink

controller is in the occupied mode. If the MODPE is

disabled then AUXO output will be energized based on

the Power Exhaust Setpoint (PES) in the SETPOINT

table.

Staging will occur as follows For heat pump units with

AUXOUT configured as reversing valve:

For Heating PID STAGES = 2 and AUXOUT = Reversing

Valve Heat (the H3_EX_RV output will stay energized

until there is a cool demand) HEAT STAGES = 1 (50%

capacity) shall energize CMP1, CMP2, RVS.

Heating — The heat stages are controlled by the Heating

Control Loop, which is used to calculate the desired SAT

needed to satisfy the space. It will compare the SPT to the

Occupied Heat Setpoint (OHSP) + the T56 slider offset

(STO) when occupied and the Unoccupied Heat Setpoint

(UHSP - Unoccupied Heating Deadband) if unoccupied to

calculate a Staged Heat Submaster Reference (SHSR).

The heat staging algorithm compares the SHSR to the

actual SAT to calculate the required number of heating

stages to satisfy the load. This loop runs every 40 seconds.

The following conditions must be met in order for this

algorithm to run:

HEAT STAGES = 2 (100% capacity) shall energize HS1

and HS2.

Heating PID STAGES = 3 and AUXOUT = Reversing

Valve Heat (the H3_EX_RV output will stay energized

until there is a cool demand)

HEAT STAGES = 1 (33% capacity if) shall energize

CMP1, CMP2, RVS

HEAT STAGES = 2 (66% capacity) shall energize HS1

HEAT STAGES = 3 (100% capacity) shall energize HS2

S Indoor fan has been ON for at least 30 seconds.

If AUXOUT is configured for Reversing Valve Cool, then

the H3_EX_RV contact will be deenergized when there is

a demand for heating. The heat stages will be cycled to

temper the SAT so that it will be between the SPT and the

SPT + 10_F (SPT < SAT < (SPT + 10_F)) if:

S Cool mode is not active and the time guard between

modes equals zero.

S Mode is occupied or the Temperature Compensated Start

or Heat mode is active.

S SPT reading is available and < (OHSP + STO).

S the number of heat stages calculated is zero

S the OAT < 55_F

S If it is unoccupied and the SPT < (UHSP - Unoccupied

Heating Deadband). The indoor fan will be turn on by the

staging algorithm.

S an IAQ sensor is installed

S the IAQ Minimum Damper Position > minimum damper

When all of the above conditions are met, the SHSR is

calculated and up to 3 stages of heat will turned on and off

to satisfy to maintain the SAT = SHSR. If any of the

above conditions are not met, the SHSR is set to its

minimum value of 35_F.

position

S and the SAT < SPT -10_F.

There is also a SAT tempering routine that will act as SAT

low limit safety to prevent the SAT from becoming too

cold should the economizer fail to close. One stage of

heating will be energized if it is not in the Cooling or Free

Cooling mode and the OAT is below 55_F and the SAT is

below 40_F. It will deenergize when the SAT > (SPT +

10_F).

S OAT Reading is available

If all of the above conditions are met, the economizer

damper IQMP is temporarily overridden by the

pre-occupancy damper position (PURGEMP). The

PURGEMP will be set to one of the following conditions

based on atmospheric conditions and the space

temperature:

Indoor Air Quality — If the optional indoor air quality

(IAQI) sensor is installed, the PremierLink controller will

maintain indoor air quality within the space at the user

configured differential setpoint (IAQD) in the CONFIG

configuration table. The setpoint is the difference between

the IAQI and an optional outdoor air quality sensor

(OAQ). If the OAQ is not present then a fixed value of

400 ppm is used. The actual space IAQ setpoint (IAQS) is

calculated as follows:

S If the OAT ≥ NTLO (Unoccupied OAT Lockout

Temperature) and OAT < 65_F and OAT is less than or

equal to OCSP and Enthalpy = Low then PURGEMP =

100%.

S If the OAT < NTLO then PURGEMP = LTMP (Low

Temperature Minimum Position - defaults to 10%)

S If the OAT > 65_F or (OAT ≥ NTLO and OAT > OCSP)

or Enthalpy = High then PURGEMP = HTMP (High

Temperature Minimum Position defaults to 35%).

IAQS = IAQD + OAQ (OAQ = 400 ppm if not present)

The LTMP and HTMP are user adjustable values from 0

to 100% in the SETPOINT table. Whenever PURGEMP

As air quality within the space changes, the minimum

position of the economizer damper will be changed also

thus allowing more or less outdoor air into the space

depending on the relationship of the IAQI to the IAQS.

The IAQ algorithm runs every 30 seconds and calculates

IAQ minimum position value using a PID loop on the

IAQI deviation from the IAQS. The IAQ minimum

position is then compared against the user configured

minimum position (MDP) and the greatest value becomes

the final minimum damper position (IQMP). If the

calculated IAQ minimum position is greater than the IAQ

maximum damper position (IAQMAXP) decision in the

SERVICE configuration table, then it will be clamped to

IAQMAXP value.

results in

number greater than 0%, the IAQ

pre-occupancy purge mode will be enabled turning on the

Indoor Fan Relay and setting the economizer IQMP to the

PURGEMP value. When IAQ pre-occupancy mode is not

active PURGEMP = 0%.

Unoccupied Free Cooling — Unoccupied free cool

function will start the indoor fan during unoccupied times

in order to cool the space with outside air. This function is

performed to delay the need for mechanical cooling when

the system enters the occupied period. Depending on how

Unoccupied Free Cooling is configured, unoccupied mode

can occur at any time in the unoccupied time period or 2

to 6 hours prior to the next occupied time. Once the space

has been sufficiently cooled during this cycle, the fan will

be stopped. In order to perform unoccupied free cooling

all of the following conditions must be met:

If IAQ is configured for low priority, the positioning of

the economizer damper can be overridden by comfort

requirements. If the SPT > OCSP + 2.5 or the SPT <

OHSP - 2.5 then IAQ minimum position becomes 0 and

the IQMP = MDP. The IAQ mode will resume when the

SPT ≤ OCSP + 1.0 and SPT ≥ OHSP - 1.0.

S NTEN option is enabled in the CONFIG configuration

table

S Unit is in unoccupied state

S Current time of day is valid

S Temperature Compensated Start mode is not active

S COOL mode is not active

S HEAT mode is not active

S SPT reading is available

If IAQ is configured for high priority and the OAT < 55_F

and the SAT < (SPT - 10_F), the algorithm will enable the

heat stages to maintain the SAT between the SPT and the

SPT + 10_F.

IAQ Pre-Occupancy Purge — This function is designed to

purge the space of airborne contaminants that may have

accumulated 2 hours prior to the beginning of the next

occupied period. The maximum damper position that will

be used is temperature compensated for cold whether

conditions and can be pre-empted by Temperature

Compensated Start function. For pre-occupancy to occur,

the following conditions must be met:

S OAT reading is available

S Enthalpy is low

S OAT > NTLO (with 1_F hysteresis) and < Max Free Cool

setpoint

If any of the above conditions are not met, Unoccupied

Free Cool mode will be stopped, otherwise, the mode will

be controlled as follows:

S IAQ Pre -Occupancy Purge option is enabled in the

CONFIG configuration table

The NTFC setpoint (NTSP) is determined as NTSP =

(OCSP + OHSP) / 2

S Unit is in the unoccupied state

S Current Time is valid

The Unoccupied Free Cool mode will be started when:

SPT > (NTSP + 2_F) and SPT > (OAT + 8_F)

The Unoccupied Free Cool mode will be stopped when:

SPT < NTSP or SPT < (OAT + 3_F)

S Next Occupied Time is valid

S Time is within 2 hours of next Occupied period

S Time is within Purge Duration (user-defined 5 to 60

minutes in the CONFIG configuration table)

Temperature Compensated Start — This function will run

when the controller is in unoccupied state and will

calculate early start bias time (SBT) based on space

temperature deviation from occupied setpoints in minutes

per degree. The following conditions will be met for the

function to run:

This function can also be used to monitor a high

condensate level switch when installed on a water source

heat pump to disable mechanic cooling in case of a

plugged evaporator condensate pan drain.

Linkage — The Linkage function in the PremierLink

controller is available for applications using a Linkage

thermostat or the 3V control system. If using the Linkage

thermostat, both the PremierLink controller and the stat

must be on the same CCN bus. When used as the air

source for a 3V control system, the PremierLink controller

is not required to be on the same CCN bus but it is

recommended. Linkage will be active when it is initiated

from the Linkage thermostat or the 3V Linkage

Coordinator through CCN communications and requires

no configuration. Only one device can be linked to the

PremierLink controller.

S Unit is in unoccupied state

S Next occupied time is valid

S Current time of day is valid

S Valid space temperature reading is available (from sensor

or linkage thermostat)

S Cool Start Bias (KCOOL) and Heat Bias Start (KHEAT)

> 0 in the CONFIG configuration table

The SBT is calculated by one of the following formulas

depending on temperature demand:

Once Linkage is active, the PremierLink controller’s own

SPT, temperature setpoints, and occupancy are ignored

and the controller will use the information provided by the

remote linkage device. The following information will be

received from the remote linked device and can be viewed

in the maintenance display table:

If SPT > OCSP then SBT = (SPT - OCSP) * KCOOL

If SPT < OHSP then SPT = (OHSP - SPT) * KHEAT.

The calculated start bias time can range from 0 to 255

minutes. When SBT is greater than 0 the function will

subtract the SBT from the next occupied time to calculate

a new start time. When a new start time is reached, the

Temperature Compensated Start mode is started. This

mode energizes the fan and the unit will operate as though

it is in occupied state. Once set, Temperature

Compensated Start mode will stay on until the unit returns

to occupied state. If either Unoccupied Free Cool or IAQ

Pre-Occupancy mode is active when Temperature

Compensated Start begins, their mode will end.

S Supervisory Element

S Supervisory Bus

S Supervisory Block

S Average Occupied Heat Setpoint

S Average Occupied Cool Setpoint

S Average Unoccupied Heat Setpoint

S Average Unoccupied Cool Setpoint

S Average Zone Temp

Door Switch — The Door Switch function is designed to

disable mechanical heating and cooling outputs when the

REMOCC contact input is closed (in the ON state) after a

programmed time delay. The fan will continue to operate

based on the current mode and the ASHRAE 90.1 Supply

Fan setting. The delay is programmable from 2 to 20

minutes by setting the Remote Cont/Door Switch decision

in the SERVICE table to a value equal to the number of

minutes desired. When the contact is open (in the OFF

state), the PremierLink controller will resume normal

temperature control.

S Average Occupied Zone Temp

S Occupancy Status

In return, the PremierLink controller will provide its SAT

and operating mode to the linked device.

It will convert its operating modes to Linkage modes. See

Table 31.

Table 31 – Linkage Modes

ROOFTOP MODE

Demand Limit

Heat

Cool or Free Cooling

IAQ Control

VALUE

N/A

LINKAGE MODE

N/A

This application is designed for use in schools or other

public places where a door switch can be installed to

monitor the opening of a door for an extended period of

time. The controller will disable mechanical cooling and

heating when the door is open for a programmed amount

of time.

Heating

Cooling

N/A

Temp. Compensated

Start Heat

Warm ---up

Temp. Compensated

Start Cool

IAQ Purge

Occupied

(Indoor Fan ON)

Cooling

Pressurization

Cooling

Unoccupied Free

Cool

Unoccupied Free

Cooling

Fire Shutdown

Factory/Field Test

Off

Evac

Off

The PremierLinkt controller will generate a Linkage

Communication Failure alarm if a failure occurs for 5

consecutive minutes once a Linkage has previously been

established. It will then revert back to its own SPT,

setpoints and occupancy schedule for control. For this

reason, Carrier strongly recommends that an SPT be

installed in the space on open plenum systems or in the

return air duct of ducted return air systems to provide

RTU--MP Sequence of Operation

The RTU-MP will control the compressor, economizer

and heating outputs based on its own space temperature

input and setpoints. An optional CO₂IAQ sensor mounted

in the space can influence the economizer minimum

position. The RTU-MP has its own hardware clock that is

set automatically when the software is installed on the

board. The RTU-MP’s default is to control to occupied

setpoints all the time, until a type of occupancy control is

set. Occupancy types are described in the scheduling

section. The following sections describe the operation for

the functions of the RTU-MP. All point objects that are

referred to in this sequence will be in reference to the

objects as viewed in BACview⁶Handheld.

continued

backup

operation.

When

Linkage

communication is restored, the controller will generate a

return to normal.

For more information on how the PremierLink controller

is used in conjunction with the Carrier 3V control system,

contact your CCN controls representative.

Scheduling

IMPORTANT: The PremierLink controller should not be

used as a linked air source in a ComfortIDt VAV system.

The ComfortID VAV system will NOT function correctly

when applied with a PremierLink controller as the air

source, resulting in poor comfort control and possible

equipment malfunction.

NOTE: The PremierLink controller can be used as an air

source in a 3V Pressure Independent (PI) System (a 3V

Linkage Coordinator with ComfortID PI Zone

Controllers), but it should not be used as an air source

with ComfortID controllers unless a 3V zone controller is

used as the Linkage Coordinator. Contact your Carrier

CCN controls representative for assistance.

Scheduling is used to start heating or cooling (become

occupied) based upon a day of week and a time period and

control to the occupied heating or cooling setpoints.

Scheduling functions are located under occupancy

determination and the schedule menu accessed by the

Menu softkey (see Appendix - for menu structure). Your

local time and date should be set for these functions to

operate properly. Five scheduling functions are available

by changing the Occupancy Source to one of the

following selections:

Always Occupied (Default Occupancy)

The unit will run continuously. RTU-MP ships from the

factory with this setting.

Demand Limit — If the demand limit option is enabled,

the control will receive and accept Redline Alert and

Loadshed commands from the CCN loadshed controller.

When a redline alert is received, the control will set the

maximum stage of capacity equal to the stage of capacity

that the unit is operating at when the redline alert was

initiated.

Local Schedule

The unit will operate according to the schedule configured

and stored in the unit. The local schedule is made up of

three hierarchy levels that consist of two Override

schedules, twelve Holiday and four Daily schedules, and

are only accessible by the BACview screen (handheld or

virtual).

When loadshed command is received the control will

reduce capacity as shown in Table 32.

The Daily schedule is the lowest schedule in the hierarchy

and is overridden by both the Holiday and Override

schedule. It consists of a start time, a stop time (both in 24

hour mode) and the seven days of the week, starting with

Monday and ending in Sunday. To select a daily schedule

scroll to the Schedules menu off of the Menu selection.

Enter the User password and change the Occupancy

Source to Local Schedule. Scroll down and over to the

Daily menu and press enter. Choose one of the four Daily

schedules by pressing the Next softkey and change the

Use? point from NO to YES by selecting the point and

pressing the INCR or DECR softkey. Press the OK softkey

and scroll to the start and stop times. Edit these times

following the same steps as the Use? point. Finally scroll

down to the Days: section and highlight the days required

for the Daily schedule by INCR or DECR softkeys and

press OK softkey.

Table 32 – Loadshed Command — Gas and Electric

Heat Units

CURRENT CAPACITY

CMP1

NEW CAPACITY

DX Cooling OFF

CMP1

CMP1+CMP2

HS1

Heat OFF

HS1+HS2 (+HS3)

HS1

The controller will have a maximum demand limit timer

of 1 hour that prevents the unit from staying in load shed

or redline alert longer than 1 hour in the event the

controller loses communication with the network load

shed module. Should the maximum demand limit timer

expire prior to receiving the loadshed device command

from CCN, the control will stop demand limit mode and

return to normal operation.

The Holiday schedule is created to override the Daily

schedule and identify a specific day and month of the year

to start and stop the unit and change control to the

unoccupied heating and cooling setpoints. Follow the

same steps to turn on one of the twelve Holiday schedules

and start and stop times. Next, select one out of the twelve

months and one out of the thirty-one days of that month.

The RTU-MP will now ignore the Daily schedule for the

specific day and time you selected and follow the Holiday

Schedule for this period.

The Override schedules primary purpose is to provide a

temporary change in the occupied heating and cooling

setpoints and force the unit to control to the unoccupied

heating and cooling setpoints. This would occur on a set

day in a particular month and last during the start and stop

time configured. The Override schedule is enabled by

following the same steps to create the Holiday schedule.

When transitioning from unoccupied to occupied, there

will be a configured time delay of 5 to 600 seconds before

starting the fan. The fan will continue to run as long as

compressors, heating stages, or the dehumidification

relays are on when transitioning from occupied to

unoccupied with the exception of Shutdown mode. If Fire

Shutdown, safety chain, SAT alarm or SPT alarm are

active; the fan will be shutdown immediately regardless of

the occupancy state or demand.

The RTU-MP has an optional Supply Fan Status input to

provide proof of airflow. If this is enabled, the point will

look for a contact closure whenever the Supply Fan Relay

is on. If it is not enabled then it will always be the same

state as the Supply Fan Relay. The cooling, economizer,

heating, dehumidification, CO₂and power exhaust

routines will use this input point for fan status.

Cooling

NOTE: Push button override is only available when

running a local or BACnet Schedule.

The compressor outputs are controlled by the Cooling

Control PID Loop and Cooling Stages Capacity algorithm.

They will be used to calculate the desired number of

stages needed to satisfy the space by comparing the Space

Temperature (SPT) to the Occupied Cool Setpoint plus the

T56 slider offset when occupied and the Unoccupied Cool

Setpoint (UCSP) plus the T56 slider offset, if unoccupied.

The economizer, if available, will be used for cooling in

addition to the compressors. The following conditions

must be true in order for this algorithm to run:

BACnet Schedule

For use with a Building Automation System that supports

native BACnet scheduling is scheduling the unit. With the

Occupancy Source set to BACnet schedule the BAS will

control the unit through network communication and it’s

own scheduling function.

BAS On/Off

The Building Automation System is scheduling the unit

via an On/Off command to the BAS ON/OFF software

point. The Building Automation System can be speaking

BACnet, Modbus, or N2 and is writing to the BAS On/Off

point in the open protocol point map.

S Indoor Fan has been ON for at least 30 seconds.

S Heat mode is not active and the time guard between

modes equals zero.

S If occupied and the SPT >(occupied cool setpoint plus

the T56 slider offset).

NOTE:

If the BAS supports NATIVE BACnet

S Space Temperature reading is available.

scheduling, then set the Occupancy Source to BACnet

schedule. If the BAS is BACnet but does NOT support

NATIVE BACnet scheduling, then set the Occupancy

Source to BAS On/Off.

S If it is unoccupied and the SPT > (unoccupied cool

setpoint plus the T56 slider offset). The indoor fan will be

turned on by the staging algorithm.

DI On/Off

S If economizer is available and active and economizer

open > 85% and SAT > (SAT low limit + 5_F) and SPT >

effective setpoint + 0.5_F.

A hard-wired input on the RTU-MP will command the

unit to start/stop. Inputs 3, 5, 8, and 9 on plug J5 can be

hard-wired to command the unit to start/stop.

NOTE: Scheduling can either be controlled via the unit

or the BAS, but NOT both.

Economizer is available, but not active

Economizer is not available

Indoor Fan

S OAT > DX Lockout temperature.

The indoor fan will be turned on whenever any one of the

following conditions is true:

S It is in the occupied mode. This will be determined by its

If all of the above conditions are met, the compressors

will be energized as required, otherwise they will be

de-energized.

There is a fixed 3-minute minimum on time and a

5-minute off time for each compressor output and a

3-minute minimum time delay between staging up or

down.

Any time the compressors are running the RTU-MP will

stage down the compressors if the SAT becomes less than

the cooling low supply air setpoint.

own internal occupancy schedule.

S Whenever there is a demand for cooling or heating in the

unoccupied mode.

S Whenever the remote occupancy switch is closed during

DI On/Off schedule type or if occupancy is forced

occupied by the BAS during BAS On/Off schedule type.

After a compressor is staged off, it may be started again

after a normal time-guard period and the supply air

temperature has increased above the low supply air

setpoint.

Economizer

S If occupied and SPT <(occupied heat setpoint plus T56

slider offset)

The Economizer dampers are used to provide free cooling

and Indoor Air Quality, if optional CO₂sensor is installed,

when the outside conditions are suitable.

The following conditions must be true for economizer

operation:

S SPT reading is available

S If it is unoccupied and the SPT < (unoccupied heat

setpoint plus T56 slider offset). The indoor fan will be

turned on by the staging algorithm.

S Indoor Fan has been on for at least 30 seconds.

S Enthalpy is Low if the Enthalpy input is enabled.

S SAT reading is available.

S OAT < High OAT lockout temperature.

If all of the above conditions are met, the heating outputs

will be energized as required, otherwise they will be

de-energized. If the SAT begins to exceed the high supply

air setpoint, a ramping function will cause the Heat Stages

Capacity algorithm to decrease the number of stages until

the SAT has dropped below the setpoint.

S OAT reading is available.

S SPT reading is available.

S OAT <= High OAT economizer lockout configuration

(default = 75).

There is a fixed one minute minimum on time and a one

minute off time for each heat output. Heat staging has a 3

minute stage up and 30 second stage down delay.

S OAT <= SPT

If any of the mentioned conditions are not true, the

economizer will be set to its configured minimum

position. The minimum damper position can be

overridden by the IAQ routine described later in this

section.

If the above conditions are true, the Economizer Control

Master Loop will calculate a damper position value based

on the following calculation:

Damper Position = minimum position + PID (SPT - econ

setpoint). Econ setpoint is half way between the effective

cool and heat setpoints. If the SAT drops below the

cooling low supply air setpoint (+ 5_F), the economizer

will ramp down to minimum position.

Indoor Air Quality

If the optional indoor air quality sensor is installed, the

RTU-MP will maintain indoor air quality within the space

at the user configured differential setpoint. The setpoint is

the difference between the indoor air quality and an

optional outdoor air quality sensor. If the outdoor air

quality is not present then a fixed value of 400ppm is

used. The following conditions must be true in order for

this algorithm to run:

S The mode is occupied.

S Indoor Fan has been ON for at least 30 seconds.

S Indoor Air Quality sensor has a valid reading

Power Exhaust

As air quality within the space changes, the minimum

position of the economizer damper will be changed thus

allowing more or less outdoor air into the space depending

on the relationship of the indoor air quality to the

differential setpoint. If all the above conditions are true,

the IAQ algorithm will run and calculates an IAQ

minimum position value using a PID loop. The IAQ

minimum damper position is then compared against the

user configured economizer minimum position and the

greatest value becomes the final minimum damper

position of the economizer output.

If RTU-MP is also controlling an exhaust fan, it can be

enabled based on damper position or by occupancy. If

configured for continuous occupied operation, it will be

energized whenever the controller is in the occupied mode

and disabled when in the unoccupied mode. If configured

for damper position control, it will be energized whenever

the economizer exceeds the power exhaust setpoint and

disabled when the economizer drops below the setpoint by

a fixed hysteresis of 10%.

Heating

If the calculated IAQ minimum position is greater than

the IAQ maximum damper position configuration then it

will be clamped to the configured value.

The heating outputs are controlled by the Heating Control

PID Loop and Heating Stages Capacity algorithm. They

will be used to calculate the desired number of stages

needed to satisfy the space by comparing the SPT to the

Occupied Heat Setpoint plus the T56 slider offset when

occupied and the Unoccupied Heat Setpoint plus the T56

slider offset if unoccupied. The following conditions must

be true in order for this algorithm to run:

Demand Limit

If the RTU-MP receives a level 1 (one degree offset), 2

(two degree offset), or a 3 (4 degree offset) to the BACnet

demand limit variable, the controller will expand the

heating and cooling setpoints by the configured demand

limit setpoint value and remain in effect until the BACnet

demand limit variable receives a 0 value.

S Indoor Fan has been ON for at least 30 seconds.

S Cool mode is not active and the time guard between

modes equals zero.

FASTENER TORQUE VALUES

See Table 33 for torque values.

Table 33 – Torque Values

Supply fan motor mounting

Supply fan motor adjustment plate

Motor pulley setscrew

120 ¦ 12 in---lbs

13.5 ¦ 1.4 Nm

8.1 ¦ 0.6 Nm

120 ¦ 12 in---lbs

72 ¦ 5 in --- lb s

Fan pulley setscrew

Blower wheel hub setscrew

72 ¦ 5 in --- lb s

65 to70 in---lbs

65 to75 in---lbs

8.1 ¦ 0.6 Nm

7.3 to 7.9 Nm

Bearing locking collar setscrew

Compressor mounting bolts

Condenser fan motor mounting bolts

Condenser fan hub setscrew

20 ¦ 2 in --- lb s

84 ¦ 12 in --- lb s

2.3 ¦ 0.2 Nm

9.5 ¦ 1.4 Nm

APPENDIX I. MODEL NUMBER SIGNIFICANCE

Model Number Nomenclature

10 11 12 13 14 15 16 17 18

C D D

____

Unit Heat Type

48 = Cooling/Gas Heat RTU

Brand / Packaging

0 = Standard

1 = LTL

Tier / Model

TC = Entry tier (with PuronR refrigerant)

Electrical Options

A = None

Heat Size

D = Low heat

E = Medium heat

C = N o n --- f u se d d isc

D = Thru the base

F = Non---fused & thru the base

F = High heat

S = Stainless steel, low heat

R = Stainless steel, medium heat

T = Stainless steel, high heat

Service Options

0 = None

1 = Unpowered convenience outlet

2 = Powered convenience outlet

Intake / Exhaust Options

A = None

Refrig. System Options

D = 2---stg. cooling comp. w/NOVATIONt coil

B = Temp econo w/ baro relief

F = Enthalpy econo w/ baro relief

K = 2 --- Po sit io n d a m p e r

Base Unit Controls

0 = Electromechanical

1 = PremierLink DDC controller

2 = RTU---MP multi protocol controller

Cooling Tons

08 = 7.5 Ton

12 = 10 Ton

14 = 12.5 Ton

Design Rev

Factory assigned

Sensor Options

A = None

Voltage

B = RA smoke detector

C = SA smoke detector

D = RA & SA smoke detector

1 = 575/3/60

5 = 208---230/3/60

6 = 460/3/60

E = CO sensor

F = RA smoke detector & CO

G = SA smoke detector & CO

H = RA & SA smoke detector & CO

2 --- S t a g e C o o l i n g C o i l O p t i o n s ( O u t d o o r --- I n d o o r )

G = Al/Al --- Al/Cu

T = A l/ A l --- A l/ C u --- L o u v e r e d H a il G u a r d s

Indoor Fan Options

1 = Standard static option

2 = Medium static option

3 = High static option

Serial Number Format

POSITION NUMBER

TYPICAL

POSITION

1---2

DESIGNATES

Week of manufacture (fiscal calendar)

Year of manufacture (“08” = 2008)

3---4

Manufacturing location (G = ETP, Texas, USA)

Sequential number

6---10

APPENDIX II. PHYSICAL DATA

(Cooling)

Physical Data

7.5 -- 12.5TONS

48TC*D08

48TC*D12

48TC*D14

Refrigeration System

# Circuits / # Comp. / Type

2 / 2 / Scroll

4 --- 6 / 4 --- 6

2 / 2 / Scroll

6 --- 0 / 6 --- 0

2 / 2 / Scroll

7 --- 6 / 8 --- 0

PuronR refrig. (R---410A) charge per

c i r c u i t A / B ( lb s --- o z )

Oil A/B (oz)

Metering Device

High---press. Trip / Reset (psig)

Low---press. Trip / Reset (psig)

42 / 42

Accutrol

630 / 505

54 / 117

42 / 42

Accutrol

630 / 505

54 / 117

56 / 56

Accutrol

630 / 505

54 / 117

Evaporator Coil

Material

Coil type

Cu / Al

3/8” RTPF

3 / 15

Cu / Al

3/8” RTPF

4 / 15

Cu / Al

3/8” RTPF

4 / 15

Rows / FPI

Total Face Area (ft )

8.9

11.1

Condensate Drain Conn. Size

3/4”

Evaporator Fan and Motor

1 / Belt

2.4

1 / Belt

2.9*

Motor Qty / Drive Type

Max BHP

1 / Belt

1.7

RPM Range

489---747

1 / Centrifugal

15 x 15

591---838

1 / Centrifugal

15 x 15

652---843

1 / Centrifugal

15 x 15

Motor Frame Size

Fan Qty / Type

Fan Diameter (in)

Motor Qty / Drive Type

Max BHP

1 / Belt

2.9*

733---949

1 / Centrifugal

15 x 15

1 / Belt

3.7

838---1084

1 / Centrifugal

15 x 15

1 / Belt

3.7

838---1084

1 / Centrifugal

15 x 15

RPM Range

Motor Frame Size

Fan Qty / Type

Fan Diameter (in)

Motor Qty / Drive Type

Max BHP

1 / Belt

4.7

1 / Belt

4.7

1 / Belt

4.7

RPM Range

909---1102

145TY

1 / Centrifugal

15 x 15

1022---1240

145TY

1 / Centrifugal

15 x 15

1022---1240

145TY

1 / Centrifugal

15 x 15

Motor Frame Size

Fan Qty / Type

Fan Diameter (in)

Condenser Coil

Material

Coil type

Al / Al

NOVATION ™

1 / 20

Al / Al

NOVATION ™

1 / 20

Al / Al

NOVATION ™

2 / 20

Rows / FPI

Total Face Area (ft )

20.5

25.1

Condenser fan / motor

Filters

Qty / Motor Drive Type

Motor HP / RPM

2/ Direct

1/4 / 1100

2 / Direct

1/4 / 1100

1/ Direct

1 / 1175

Fan diameter (in)

RA Filter # / Size (in)

4 / 16 x 20 x 2

1 / 20 x 24 x 1

4 / 20 x 20 x 2

1 / 20 x 24 x 1

4 / 20 x 20 x 2

1 / 20 x 24 x 1

OA inlet screen # / Size (in)

AI / AI: Aluminum Tube / Aluminum Fin

Cu / AI: Copper Tube / Aluminum Fin

RTPF: Round Tube / Plate Fin

* 575V motor utilizes 3.7 BHP

APPENDIX II. PHYSICAL DATA (cont.)

(Heating)

Physical Data

7.5 -- 12.5TONS

48TC**08

48TC**12

48TC**14

Gas Connection

# of Gas Valves

Nat. gas supply line press (in. w.g.)/(PSIG)

LP supply line press (in. w.g.)/(PSIG)

4 --- 1 3 / 0 . 1 8 --- 0 . 4 7

11---13 / 0.40---0.47

4 --- 1 3 / 0 . 1 8 --- 0 . 4 7

11---13 / 0.40---0.47

4 --- 1 3 / 0 . 1 8 --- 0 . 4 7

11---13 / 0.40---0.47

Heat Anticipator Setting (Amps)

1st stage

0.14

2nd stage

Natural Gas Heat, Liquid Propane Heat

# of stages / # of burners (total)

Connection size

1 / 3

2 / 4

1/2” NPT

195 / 115

20 --- 50

3/4” NPT

195 / 115

25 --- 65

3/4” NPT

195 / 115

25 --- 65

Rollout switch opens / Closes

Temperature rise (min/max)

# of stages / # of burners (total)

Connection size

2 / 4

2 / 5

3/4” NPT

195 / 115

35 --- 65

3/4” NPT

195 / 115

30 --- 65

3/4” NPT

195 / 115

25 --- 65

Rollout switch opens / Closes

Temperature rise (min/max)

# of stages / # of burners (total)

Connection Size

2 / 5

3/4” NPT

195 / 115

45 --- 75

3/4” NPT

195 / 115

35 --- 70

3/4” NPT

195 / 115

35 --- 70

Rollout switch opens / Closes

Temperature rise (min/max)

APPENDIX III. FAN PERFORMANCE

48TC**08

3 PHASE

7.5 TON HORIZONTAL SUPPLY

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2

0.4

0.6

0.8

1.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Standard Static Option

Medium Static Option

2250

2438

2625

2813

3000

3188

3375

3563

3750

505

533

562

591

621

652

682

713

745

0.52

0.62

0.74

0.88

1.03

1.21

1.40

1.61

1.85

586

610

635

661

688

715

743

772

801

0.73

0.85

0.98

1.13

1.29

1.48

1.68

1.91

2.15

657

679

701

725

749

774

800

826

853

0.97

1.09

1.23

1.39

1.57

1.77

1.98

2.22

2.48

722

742

762

783

806

829

853

878

903

1.22

1.36

1.51

1.68

1.87

2.07

2.30

2.55

2.82

782

800

819

839

859

881

903

927

951

1.50

1.65

1.81

1.98

2.18

2.40

2.63

2.89

3.18

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

1.2

2.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Medium Static Option

High Static Option

2250

2438

2625

2813

3000

3188

3375

3563

3750

838

854

872

890

910

930

951

973

996

1.81

1.96

2.12

2.31

2.51

2.74

2.99

3.26

3.55

891

906

922

940

958

977

997

1018

1040

2.12

2.28

2.46

2.65

2.86

3.10

3.35

3.63

3.93

941

955

970

2.46

2.63

2.81

3.01

3.23

3.47

3.74

4.02

4.34

988

1001

1016

1031

1048

1065

1083

1103

2.82

2.99

3.17

3.38

3.61

3.86

4.13

4.43

1033

1046

1060

1074

1090

1107

1124

3.19

3.37

3.56

3.77

4.01

4.26

4.54

986

1004

1022

1041

1061

1082

NOTE: For more information, see General Fan Performance Notes on page 87.

Boldface indicates field -supplied drive is required.

1. Recommend using field -supplied fan pulley (part no. KR11AZ002) and belt (part no. KR29AF054).

48TC**08

3 PHASE

7.5 TON VERTICAL SUPPLY

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.4 0.6 0.8

0.2

1.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Standard Static Option

Medium Static Option

2250

2438

2625

2813

3000

3188

3375

3563

3750

513

541

570

600

629

660

690

721

752

0.54

0.65

0.77

0.91

1.07

1.25

1.45

1.67

1.91

595

620

645

672

699

726

754

783

812

0.76

0.89

1.02

1.18

1.35

1.54

1.75

1.98

2.24

665

688

712

736

761

787

813

840

867

1.01

1.14

1.29

1.46

1.64

1.85

2.07

2.32

2.59

728

750

772

794

818

842

867

892

918

1.27

1.42

1.58

1.76

1.95

2.17

2.41

2.67

2.95

786

806

827

848

871

894

917

941

966

1.56

1.71

1.88

2.07

2.28

2.51

2.76

3.03

3.32

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

1.2

2.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Medium Static Option

High Static Option

2250

2438

2625

2813

3000

3188

3375

3563

3750

839

858

878

899

920

942

964

988

1011

1.86

2.02

2.20

2.40

2.62

2.86

3.12

3.41

3.71

889

907

926

946

966

987

1009

1032

1054

2.18

2.35

2.54

2.75

2.98

3.23

3.50

3.80

4.11

935

953

972

2.52

2.70

2.89

3.11

3.35

3.61

3.89

4.20

4.53

980

997

2.87

3.06

3.26

3.49

3.74

4.01

4.30

4.61

1022

1039

1056

1074

1093

1112

3.23

3.43

3.64

3.88

4.14

4.42

---

1015

1033

1052

1072

1093

1114

991

1010

1031

1052

1074

1096

---

NOTE: For more information, see General Fan Performance Notes on page 87.

Boldface indicates field -supplied drive is required.

1. Recommend using field -supplied fan pulley (part no. KR11AZ002) and belt (part no. KR29AF054).

FAN PERFORMANCE (cont.)

48TC**12

3 PHASE

10 TON HORIZONTAL SUPPLY

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.4 0.6 0.8

0.2

1.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

F i e l d --- S u p p l i e d D r i v e

Standard Static Option

Medium Static Option

3000

3250

3500

3750

4000

4250

4500

4750

5000

579

613

648

683

719

756

792

830

867

0.70

0.85

1.03

1.23

1.45

1.71

1.99

2.31

2.66

660

690

721

753

786

819

853

888

923

0.89

1.06

1.25

1.47

1.71

1.98

2.28

2.62

2.98

732

760

788

817

848

879

910

943

976

1.09

1.27

1.48

1.71

1.97

2.26

2.57

2.92

3.30

799

823

850

877

905

934

964

995

1026

1.29

1.49

1.71

1.96

2.23

2.53

2.87

3.23

3.63

860

883

907

933

959

1.50

1.71

1.95

2.21

2.50

2.81

3.16

3.54

3.95

987

1015

1044

1074

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

1.2

2.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Medium Static Option

High Static Option

3000

3250

3500

3750

4000

4250

4500

4750

5000

917

938

961

1.70

1.93

2.18

2.46

2.76

3.09

3.46

3.85

4.28

970

991

1.91

2.16

2.42

2.71

3.03

3.38

3.76

4.16

4.61

1021

1041

1062

1083

1106

1130

1155

1180

2.13

2.38

2.66

2.97

3.30

3.66

4.06

4.48

1070

1089

1108

1129

1151

1174

1198

2.34

2.61

2.91

3.23

3.58

3.95

4.36

1117

1134

1153

1173

1194

1216

1239

2.56

2.85

3.15

3.49

3.85

4.24

4.66

1013

1035

1059

1084

1110

1137

1164

985

1011

1037

1064

1091

1120

---

NOTE: For more information, see General Fan Performance Notes on page 87.

Boldface indicates field -supplied drive is required.

1. Recommend using field -supplied fan pulley (part no. KR11AD912) and belt (part no. KR29AF051).

2. Recommend using field -supplied motor pulley (part no. KR11HY410).

48TC**12

3 PHASE

10 TON VERTICAL SUPPLY

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.4 0.6 0.8

0.2

1.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Standard Static Option

Medium Static Option

3000

3250

3500

3750

4000

4250

4500

4750

5000

616

655

695

736

777

818

860

902

944

0.79

0.96

1.17

1.41

1.68

1.98

2.32

2.69

3.11

689

724

760

797

834

873

912

951

991

0.97

1.16

1.38

1.63

1.91

2.23

2.58

2.97

3.40

757

788

821

855

889

925

962

999

1037

1.16

1.37

1.60

1.86

2.16

2.49

2.85

3.26

3.70

821

849

879

910

942

1.36

1.58

1.83

2.10

2.41

2.75

3.13

3.55

4.00

882

907

934

963

993

1025

1057

1091

1125

1.57

1.80

2.06

2.35

2.67

3.02

3.41

3.84

4.31

976

1010

1046

1082

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

1.2

2.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Medium Static Option

High Static Option

3000

3250

3500

3750

4000

4250

4500

4750

5000

939

962

987

1014

1042

1072

1103

1135

1167

1.79

2.03

2.30

2.60

2.93

3.30

3.70

4.14

4.63

994

1015

1038

1063

1090

1118

1147

1177

2.01

2.26

2.54

2.86

3.20

3.58

4.00

4.45

1047

1066

1088

1111

1136

1162

1190

2.24

2.50

2.80

3.12

3.48

3.87

4.29

1098

1115

1135

1157

1180

1205

1232

2.47

2.75

3.05

3.39

3.76

4.16

4.60

1147

1163

1181

1202

1224

---

2.71

3.00

3.32

3.66

4.04

---

NOTE: For more information, see General Fan Performance Notes on page 87.

Boldface indicates field -supplied drive is required.

1. Recommend using field -supplied motor pulley (part no. KR11HY410).

48TC**14

3 PHASE

12.5 TON HORIZONTAL SUPPLY

Available External Static Pressure (in. wg)

0.6

0.2

0.4

0.8

1.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Standard Static Option

Medium Static Option

3438

3750

4063

4375

4688

5000

5313

5625

5938

6250

639

683

728

774

820

867

914

962

1009

0.98

1.23

1.52

1.85

2.23

2.66

3.15

3.69

4.30

713

753

794

836

879

923

967

1012

1058

1.20

1.47

1.78

2.13

2.53

2.98

3.49

4.05

4.68

781

817

855

894

935

976

1018

1061

1.43

1.71

2.04

2.41

2.83

3.30

3.83

4.42

843

877

912

949

987

1026

1066

1.65

1.96

2.31

2.70

3.14

3.63

4.17

901

933

966

1001

1037

1074

1112

1.88

2.21

2.57

2.98

3.44

3.95

4.52

Available External Static Pressure (in. wg)

1.6

1.2

1.4

1.8

2.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Medium Static Option

High Static Option

3438

3750

4063

4375

4688

5000

5313

5625

5938

6250

955

985

1017

1050

1084

2.12

2.46

2.84

3.27

3.75

1007

1035

1066

1097

1130

2.35

2.71

3.12

3.56

4.06

1056

1083

1112

1142

2.59

2.97

3.39

3.86

1103

1129

1157

1186

1216

1248

2.83

3.23

3.67

4.15

4.68

5.27

1148

1173

1200

1228

1257

1288

3.08

3.49

3.95

4.45

5.00

5.60

1174

4.37

1120

4.28

1164

4.61

NOTE: For more information, see General Fan Performance Notes on page 87.

Boldface indicates field -supplied drive is required.

48TC**14

3 PHASE

12.5 TON VERTICAL SUPPLY

Available External Static Pressure (in. wg)

0.6

0.2

0.4

0.8

1.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Standard Static Option

Medium Static Option

3438

3750

4063

4375

4688

5000

5313

5625

5938

6250

685

736

787

839

891

944

997

1051

1.12

1.41

1.75

2.14

2.60

3.11

3.69

4.34

751

797

844

892

941

991

1042

1093

1.32

1.63

1.99

2.40

2.87

3.40

4.00

4.67

813

855

898

943

990

1037

1085

1.54

1.86

2.24

2.67

3.15

3.70

4.32

871

910

951

993

1037

1082

1128

1.76

2.10

2.49

2.94

3.44

4.00

4.64

927

963

1001

1041

1082

1125

1.99

2.35

2.75

3.21

3.73

4.31

Available External Static Pressure (in. wg)

1.6

1.2

1.4

1.8

2.0

CFM

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

RPM

BHP

Medium Static Option

High Static Option

3438

3750

4063

4375

4688

5000

5313

5625

5938

6250

981

1014

1049

1087

1126

1167

2.23

2.60

3.02

3.49

4.03

4.63

1032

1063

1097

1132

2.47

2.86

3.29

3.78

1082

1111

1142

1176

2.72

3.12

3.57

4.08

1130

1157

1186

1218

2.97

3.39

3.85

4.37

1177

1202

1230

1260

3.23

3.66

4.14

4.68

1169

4.33

1211

4.64

NOTE: For more information, see General Fan Performance Notes on page 87.

Boldface indicates field -supplied drive is required.

APPENDIX III. FAN PERFORMANCE (cont.)

Pulley Adjustment

MOTOR PULLEY TURNS OPEN

MOTOR/DRIVE

UNIT

COMBO

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

Standard Static

747

721

695

670

644

618

592

566

541

515

489

Medium Static

High Static

949

1102

838

927

1083

813

906

1063

789

884

1044

764

863

1025

739

841

1006

715

819

986

798

967

776

948

755

928

733

909

Standard Static

Medium Static

High Static

690

665

640

616

591

1084

1240

838

1059

1218

813

1035

1196

789

1010

1175

764

986

961

936

912

887

863

838

1153

739

1131

715

1109

690

1087

665

1066

640

1044

616

1022

591

Standard Static

Medium Static

High Static

1084

1240

1059

1218

1035

1196

1010

1175

986

961

936

912

887

863

838

1153

1131

1109

1087

1066

1044

1022

NOTE: Do not adjust pulley further than 5 turns open.

- Factory settings

ELECTRICAL INFORMATION

48TC*D08

V --- P h --- H z

2---Stage Cooling

7.5 Tons

VOLTAGE

RANGE

COMP (Cir 1)

COMP (Cir 2)

OFM (ea)

IFM

Max

RLA

LRA

RLA

LRA

WATTS

FLA

TYPE

EFF at Full Load FLA

MIN MAX

WATTS AMP Draw

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

1448

2278

4400

1448

2278

4400

1448

2278

4400

1379

3775

4400

5.5

7.9

15.0

5.5

7.9

15.0

2.7

3.6

7.4

2.5

2.9

5.9

80%

81%

80%

81%

80%

81%

80%

81%

5.2

7.5

15.0

5.2

7.5

15.0

2.6

3.4

7.4

2.4

2.8

5.6

2 0 8 --- 3 --- 6 0 187 253 13.6

2 3 0 --- 3 --- 6 0 187 253 13.6

4 6 0 --- 3 --- 6 0 414 506 6.1

13.6

325

1.5

13.6

6.1

1.5

0.8

0.6

5 7 5 --- 3 --- 6 0 518 633 4.2

4.2

48TC*D12

2---Stage Cooling

COMP (Cir 2) OFM (ea)

10 Tons

VOLTAGE

RANGE

COMP (Cir 1)

IFM

V --- P h --- H z

Max

RLA

LRA

RLA

LRA

WATTS

FLA

TYPE

EFF at Full Load FLA

MIN MAX

WATTS AMP Draw

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

2120

3775

4400

2120

3775

4400

2120

3775

4400

1390

3775

4400

5.5

10.5

15.0

5.5

10.5

15.0

2.7

4.6

7.4

2.1

2.9

80%

81%

80%

81%

80%

81%

80%

81%

5.2

10.0

15.0

5.2

10.0

15.0

2.6

4.4

7.4

2.0

2.8

2 0 8 --- 3 --- 6 0 187 253 15.6

2 3 0 --- 3 --- 6 0 187 253 15.6

4 6 0 --- 3 --- 6 0 414 506 7.7

110

15.9

110

325

1.5

110

15.9

7.7

110

1.5

0.8

0.6

5 7 5 --- 3 --- 6 0 518 633 5.8

5.7

5.9

5.6

48TC*D14

2---Stage Cooling

COMP (Cir 2) OFM (ea)

12.5 Tons

VOLTAGE

RANGE

COMP (Cir 1)

IFM

V --- P h --- H z

Max

RLA

LRA

RLA

LRA

WATTS

FLA

TYPE

EFF at Full Load FLA

MIN MAX

WATTS AMP Draw

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

2615

3775

4400

2615

3775

4400

2615

3775

4400

3775

4400

7.9

10.5

15.0

7.9

10.5

15.0

3.6

4.6

7.4

2.9

81%

7.5

10.0

15.0

7.5

10.0

15.0

3.4

4.4

7.4

2.8

2 0 8 --- 3 --- 6 0 187 253 19.0

2 3 0 --- 3 --- 6 0 187 253 19.0

4 6 0 --- 3 --- 6 0 414 506 9.7

5 7 5 --- 3 --- 6 0 518 633 7.4

123

22.4

149

1288

6.2

123

22.4

10.6

7.7

149

6.2

3.1

2.5

5.9

5.6

MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O.

NO C.O. or UNPWRD C.O.

w/ P.E. (pwrd fr/ unit)

COMBUSTION

FAN MOTOR

FLA

POWER

EXHAUST

FLA

NO P.E.

NOM.

V --- P h --- H z

IFM

TYPE

DISC. SIZE

FLA LRA

DISC. SIZE

FLA LRA

MCA

MOCP

MCA

MOCP

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

STD

MED

HIGH

STD

43.6

45.9

53.8

20.1

20.9

25.3

14.8

15.2

18.3

48.5

53.3

58.3

23.7

25.5

28.5

17.9

18.7

21.5

65.5

68.0

198

235

261

116

129

47.4

49.7

57.6

21.9

22.7

27.1

18.6

19.0

22.1

52.3

57.1

62.1

25.5

27.3

30.3

21.7

22.5

25.3

69.3

71.8

202

239

265

118

131

208/230---3---60

4 6 0 --- 3 --- 6 0

0.48

0.25

0.24

0.48

0.25

3.8

1.8

3.8

1.8

5 7 5 --- 3 --- 6 0

108

263

306

315

125

147

151

106

120

365

382

112

267

310

319

127

149

153

110

124

369

386

208/230---3---60

4 6 0 --- 3 --- 6 0

5 7 5 --- 3 --- 6 0

0.24

0.48

3.8

MED

208/230---3---60

4 6 0 --- 3 --- 6 0

HIGH Model not available due to high amperage draw.

STD

MED

HIGH

STD

MED

HIGH

31.7

32.7

35.7

24.0

26.8

183

192

196

144

158

33.5

34.5

37.5

27.8

30.6

185

194

198

148

162

0.25

0.24

1.8

3.8

5 7 5 --- 3 --- 6 0

Example: Supply voltage is 230-3-60

LEGEND:

DISC

FLA

IFM

LRA

MCA

MOCP

P E

AB = 224 v

BC = 231 v

AC = 226 v

--- Convenient outlet

--- Disconnect

--- Full load amps

--- Indoor fan motor

--- Locked rotor amps

--- Minimum circuit amps

--- Maximum over current protection

--- Po w e r e x h a u st

(224 + 231 + 226)

681

Average Voltage =

UNPWRD CO --- Unpowered convenient outlet

NOTES:

227

1. In compliance with NEC requirements for multimotor and

combination load equipment (refer to NEC Articles 430 and

440), the overcurrent protective device for the unit shall be

fuse or HACR breaker. Canadian units may be fuse or circuit

breaker.

Determine maximum deviation from average voltage.

(AB) 227 – 224 = 3 v

(BC) 231 – 227 = 4 v

(AC) 227 – 226 = 1 v

Maximum deviation is 4 v.

2. Unbalanced 3-Phase Supply Voltage

Determine percent of voltage imbalance.

Never operate a motor where a phase imbalance in supply

voltage is greater than 2%. Use the following formula to

determine the percentage of voltage imbalance.

% Voltage Imbalance

= 100 x

= 1.76%

227

max voltage deviation from average voltage

% Voltage Imbalance = 100 x

This amount of phase imbalance is satisfactory as it is below the

maximum allowable 2%.

average voltage

IMPORTANT: If the supply voltage phase imbalance is more than

2%, contact your local electric utility company immediately.

APPENDIX IV. WIRING DIAGRAM LIST

Wiring Diagrams

48TC

SIZE

VOLTAGE

208/230---3---60

460---3---60

575---3---60

208/230---3---60

460---3---60

575---3---60

208/230---3---60

460---3---60

575---3---60

PremierLink*

RTU---MP*

CONTROL

48TM501325

48TM501379

48TM500984

48TM500988

POWER

48TM501326

48TM501327

48TM501326

48TM501327

48TM501380

48TM501381

D08

D12

D14

All

NOTE: Component arrangement on Control; Legend on Power Schematic

PremierLink and RTU -MP control labels overlay a portion of the base unit control label. The base unit label drawing and the control option drawing are

required to provide a complete unit control diagram.

APPENDIX V. MOTORMASTER SENSOR LOCATIONS

C09158

Fig. 86 - 48TC*D08-D12 Outdoor Circuiting

NOTE: The low ambient kit for the 12.5 ton unit utilizes a pressure transducer, and therefore there is no Motormaster

temperature sensor location for this unit.

Catalog No: 48TC-3SM

Printed in U.S.A.

Edition Date: 7/09

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Replaces: NEW

UNIT START-UP CHECKLIST

I. PRELIMINARY INFORMATION:

MODEL NO.:

SERIAL NO: _____________________________________

TECHNICIAN: ___________________________________

BUILDING LOCATION:____________________________

DATE:

______________

II. PRE-START-UP (insert check mark in box as each item is completed):

VERIFY THAT ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT

VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS

VERIFY THAT FLUE HOOD IS INSTALLED

CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS

CHECK TO ENSURE NO WIRES ARE TOUCHING REFRIGERANT TUBING OR SHARP EDGES

CHECK GAS PIPING FOR LEAKS

CHECK THAT RETURN--AIR FILTER IS CLEAN AND IN PLACE

VERIFY THAT UNIT INSTALLATION IS LEVEL

CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND VERIFY SETSCREW IS TIGHT

VERIFY PULLEY ALIGNMENT AND BELT TENSION ARE CORRECT

III. START-UP

ELECTRICAL

SUPPLY VOLTAGE

COMPRESSOR 1

COMPRESSOR 2

INDOOR FAN AMPS

L1-L2

L2-L3

L3-L1

TEMPERATURES

OUTDOOR-AIR TEMPERATURE

RETURN-AIR TEMPERATURE

COOLING SUPPLY AIR

GAS HEAT SUPPLY AIR

PRESSURES

GAS INLET PRESSURE

IN. WG

GAS MANIFOLD PRESSURE

REFRIGERANT SUCTION

IN. WG (LOW FIRE)

IN. WG (HI FIRE)

TEMP _F

CIR 1

CIR 2

CIR 1

CIR 2

PSIG

TEMP _F

REFRIGERANT DISCHARGE

TEMP _F

VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS

VERIFY THAT 3--PHASE SCROLL COMPRESSORS ARE ROTATING IN CORRECT DIRECTION

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