Carrier GEMINI 38APS025 050 User Manual

GEMINI™ SELECT

38APS025-050,38APD025-100

Commercial Air-Cooled Condensing Units

with COMFORTLINK™ Controls

50/60 Hz

Controls, Start-Up, Operation,

Service, and Troubleshooting

CONTENTS

Page

Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Actual Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Operating Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

• AMBIENT LIMITATIONS

Page

SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . .1,2

GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Conventions Used in This Manual. . . . . . . . . . . . . . . . 2

Display Module Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 17

• SCROLLING MARQUEE DISPLAY

• ACCESSORY NAVIGATOR™ DISPLAY MODULE

Main Base Board (MBB). . . . . . . . . . . . . . . . . . . . . . . . . 18

Current Sensor Board (CSB) . . . . . . . . . . . . . . . . . . . . 18

Energy Management Module (EMM) . . . . . . . . . . . . . 18

Compressor Expansion Module (CXB) . . . . . . . . . . 19

AUX Board (AUX). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Enable/Off/Remote Contact Switch. . . . . . . . . . . . . . 19

Emergency On/Off Switch. . . . . . . . . . . . . . . . . . . . . . . 19

Board Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Control Module Communication. . . . . . . . . . . . . . . . . 19

Carrier Comfort Network^®(CCN) Interface. . . . . . . 20

OPERATING DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-33

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

• RETURN AIR TEMPERATURE (RAT) ACCESSORY

• SUPPLY AIR TEMPERATURE (SAT) ACCESSORY

• COMPRESSOR RETURN GAS TEMPERATURE

SENSOR (RGT)

• VOLTAGE (ALL UNITS)

Operation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49-59

Electronic Components . . . . . . . . . . . . . . . . . . . . . . . . . 49

• CONTROL COMPONENTS

Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Pressure Transducers. . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Condenser Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Motormaster^®V Controller . . . . . . . . . . . . . . . . . . . . . . 54

• GENERAL OPERATION

• CONFIGURATION

• DRIVE PROGRAMMING

• EPM CHIP

• LOSS OF CCN COMMUNICATIONS

• TROUBLESHOOTING

• REPLACING DEFECTIVE MODULES

Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59,60

Recommended Maintenance Schedule. . . . . . . . . . 59

Microchannel Heat Exchanger (MCHX) Condenser

Coil Maintenance and Cleaning

• OUTDOOR-AIR TEMPERATURE SENSOR (OAT)

• DISCHARGE TEMPERATURE THERMISTOR (DTT)

• SPACE TEMPERATURE SENSOR (SPT)

Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 60-66

Complete Unit Stoppage and Restart. . . . . . . . . . . . 60

• GENERAL POWER FAILURE

• UNIT ENABLE-OFF-REMOTE CONTACT SWITCH

IS OFF

• FAN STATUS INPUT OPEN

• OPEN 24-V CONTROL CIRCUIT BREAKER(S)

• COOLING LOAD SATISFIED

• THERMISTOR FAILURE

• COMPRESSOR SAFETIES

Alarms and Alerts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

APPENDIX A — DISPLAY TABLES . . . . . . . . . . . 67-78

APPENDIX B — CCN TABLES . . . . . . . . . . . . . . . . 79-84

START-UP CHECKLIST FOR 38AP SPLIT SYSTEM

CONDENSING UNIT. . . . . . . . . . . . . . . . . . . .CL-1-CL-5

Fan Status Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Thermostat Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Pressure Transducer Inputs. . . . . . . . . . . . . . . . . . . . . 23

Energy Management Module . . . . . . . . . . . . . . . . . . . . 23

Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Service Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Operation of Machine Based on Control

Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Set Point Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

• DEMAND LIMIT (2-Stage Switch Controlled)

• EXTERNALLY POWERED DEMAND LIMIT

(4 to 20 mA Controlled)

• DEMAND LIMIT (CCN Loadshed Controlled)

SAFETY CONSIDERATIONS

Cooling Set Point (4 to 20 mA) . . . . . . . . . . . . . . . . . . 32

Digital Scroll Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

System Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-49

Preliminary Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Adjust Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . 34

Check Compressor Oil Level . . . . . . . . . . . . . . . . . . . . 47

Final Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Installing, starting up, and servicing this equipment can be

hazardous due to system pressures, electrical components, and

equipment location (roof, elevated structures, mechanical

rooms, etc.). Only trained, qualified installers and service

mechanics should install, start up, and service this equipment.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53380003-01 Printed in U.S.A. Form 38AP-1T Pg 1 210 11-09 Replaces: New

LEGEND

AUX

—

Auxiliary

—

Contactor

Circuit Breaker

CCHR

CSB

EMM

EQUIP GND

Crankcase Heater Relay

Current Sensor Board

Energy Management Module

Equipment Ground

Fuse Block

Fan Contactor

LON

MBB

Local Operating Network

Main Base Board

Switch

Terminal Block

TRAN

UPC

Transformer

Unitary Protocol Converter

Fig. 1 — Component Arrangement — Unit Sizes 025-030

LEGEND

AUX

—

Auxiliary

Contactor

Circuit Breaker

CCH

CSB

EMM

EQUIP GND

Crankcase Heater Relay

Current Sensor Board

Energy Management Module

Equipment Ground

Fan Contactor

FCB

LON

MBB

Fan Circuit Breaker

Local Operating Network

Main Base Board

Motormaster^®

Switch

Terminal Block

TRAN

UPC

Transformer

Unitary Protocol Converter

Fig. 2 — Component Arrangement — Unit Sizes 040-060

LEGEND

AUX

—

Auxiliary

Contactor

Circuit Breaker

CCH

CSB

CXB

EMM

EQUIP GND

FCB

LON

MBB

TRAN

UPC

Crankcase Heater Relay

Current Sensor Board

Compressor Expansion Board

Energy Management Module

Equipment Ground

Fan Contactor

Fan Circuit Breaker

Local Operating Network

Main Base Board

Switch

Terminal Block

Transformer

Unitary Protocol Converter

Fig. 3 — Component Arrangement — Unit Sizes 070-100

Fig. 4 — Power Wiring Schematic — 38APS,APD025-030

Fig. 5 — Power Wiring Schematic — 38APS040,050

Fig. 6 — Power Wiring Schematic — 38APD040-060

Fig. 7 — Power Wiring Schematic — 38APD070-100

Fig. 8 — Control Wiring Schematic — 38APS025-050

Fig. 9 — Control Wiring Schematic — 38APD025-060

Fig. 10 — Control Wiring Schematic — 38APD070-100

Legend and Notes for Fig. 4-10

LEGEND

NOTES:

1. Factory wiring is in accordance with UL (Underwriters Labora-

ACCSY

ALM

AMPS

AUX

— Accessory

tories) 1995 standards. Any field modifications or additions

must be in compliance with all applicable codes.

2. Use 75 C minimum wire for field power supply.

3. All field interlock contacts must have a minimum rating of

2 amps at 24-vac sealed. See field interlock wiring.

4. Compressor and fan motors are thermally protected. Three-

phase motors protected against single-phase conditions.

5. Terminals 13 and 14 of LVT are for field connection of remote

on-off. The contact must be rated for dry circuit application

capable of handling a 5-vdc, 1 mA to 20 mA load.

6. For 500 series unit operation at 208-3-60 line voltage, TRAN1

primary connections must be moved to terminals H3 and H4.

7. For 575-3-60 units, fan circuit breakers FCB1 and FCB2 are

replaced with fuse blocks FB1 and FB2.

— Alarm

— Amperes

— Auxiliary

— Contactor

— Circuit Breaker

CCB

CCH

— Compressor Circuit Breaker

— Crankcase Heater Relay

— Crankcase Heater

— Compressor

COMP

CSB

CXB

DGS

DPT

DTT

DUS

EMM

— Current Sensor Board

— Compressor Expansion Module

— Digital Scroll

— Discharge Pressure Transducer

— Discharge Temperature Thermistor

— Digital Unloaded Solenoid

— Energy Management Module

8. For units with low ambient Motormaster^®V factory-installed

option or field-installed acessory, fan contactors FC1 and FC2

are replaced with fan relays FR1 and FR2.

9. MP-A1 not used in the following units:

070-100: 400-v, 460-v units without digital scroll

10. MP-A2 not used in the following units:

070-100: 400-v, 460-v

EQUIP GND — Equipment Ground

— Fuse Block

— Fan Contactor

FCB

FIOP

— Fan Circuit Breaker

— Factory-Installed Option

— Fan Relay

11. MP-B1 not used in the following units:

070: all units

— Fan Status

080-100: 400-v, 460-v

— Fuse

12. MP-B2 not used in the following units:

070: all units

GND

HPS

LLSV

LVT

MBB

MLV

— Ground

— High Pressure Switch

— Liquid Line Solenoid Valve

— Low Voltage Terminal

— Main Base Board

— Minimum Load Valve

— Motormaster

080-100: 400-v, 460-v

13. MP-A3 not used in the following units:

090,100: 400-v, 460-v

14. MP-B3 not used in the following units:

070: all units

080-100: 400-v, 460-v

— Modular Motor Protector

— National Electrical Code

— Outdoor Air Thermistor

— Outdoor Fan Motor

— Option

15. Jumper plug required when modular motor protector is not

used.

NEC

OAT

OFM

OPT

— Plug

RAT

RGT

RLY

SAT

SEN

SET

SPT

— Return Air Temperature

— Return Gas Temperature

— Relay

— Supply Air Temperature

— Sensor Terminal Block

— Set Point Terminal Block

— Suction Pressure Transducer

— Switch

— Terminal Block

TEMP

TRAN

UPC

— Temperature

— Transformer

— Unitary Protocol Converter

— Cool Stage

a38-7122

LEGEND

b. Incoming wire size range for terminal block with MCA from 175.1 amps to

420 amps is 2 AWG to 600 kcmil.

EQUIP GND

NEC

—

Equipment Ground

National Electrical Code

c. Incoming wire size range for non-fused disconnect with MCA up to

100 amps is 14 AWG to 1/0.

d. Incoming wire size range for non-fused disconnect with MCA from

100.1 amp to 200 amps is 6 AWG to 350 kcmil.

NOTES:

1. Factory wiring is in accordance with UL 1995 standards. Field modifications

or additions must be in compliance with all applicable codes.

2. All units or modules have single point primary power connection. Main

power must be supplied from a field or factory-supplied disconnect.

3. Wiring for main field supply must be rated 75 C. Use copper conductors only.

a. Incoming wire size range for terminal block with MCA (minimum circuit

amps) up to 175 amps is 14 AWG (American Wire Gage) to 2/0.

e. Incoming wire size range for non-fused disconnect with MCA from

200.1 amp to 450 amps is 3/0 to 500 kcmil.

4. Refer to certified dimensional drawings for exact locations of the main power

and control power entrance locations.

Fig. 11 — Field Power Wiring

RETURN

AIR

a38-7133

MAT/RAT

FS1*

SAT

OUTSIDE

AIR

DUCT

SUPPLY

FAN

LEGEND

FS1 — Fan Status Switch (24-v)

EVAPORATOR

COIL

MAT — Mixed Air Temperature Sensor

RAT — Return Air Temperature Sensor

SAT — Supply Air Temperature Sensor

*FS1 can be pressure differential switch (shown), motor current detection, or sail switch.

Fig. 12 — MAT/RAT and SAT Sensor Layout

LVT

TERMINAL

STRIP

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

REMOTE

ON/OFF

ALM

COOL 2

COOL 1

a38-7125

*Not required for single circuit units.

Fig. 13 — Constant Volume Application Wiring Diagram 2-Stage Thermostat Control, Sizes 025-030 —

without Digital Scroll Option

LVT

TERMINAL

STRIP

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

REMOTE

ON/OFF

ALM

COOL2

COOL 1

a38-7126

*See Fig. 12 for MAT/RAT and SAT location.

†Not required for single circuit units.

Fig. 14 — Constant Volume Application Wiring Diagram 2-Stage Thermostat Control —

with Digital Scroll Option, Sizes 025-030 or All Sizes 040-100

LVT

TERMINAL

STRIP

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

REMOTE

ON/OFF

ALM

SAT

a38-7127

*See Fig. 12 for MAT/RAT and SAT location.

†Not required for single circuit units.

Fig. 15 — Constant Volume Application Wiring Diagram Space Temperature Sensor Control, Sizes 025-100

LVT

TERMINAL

STRIP

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

REMOTE

ON/OFF

ALM

SAT

a38-7128

*See Fig. 12 for MAT/RAT and SAT location.

†Not required for single circuit units.

Fig. 16 — Variable Air Volume Application Wiring Diagram, Sizes 025-100

LVT

TERMINAL

STRIP

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

a38-7129

Fig. 17 — Optional Energy Management Module Wiring

Legend and Notes for Fig. 13-17

LEGEND

a. Incoming wire size range for terminal block with MCA (mini-

mum circuit amps) up to 175 amps is 14 AWG (American

Wire Gage) to 2/0.

ALM R

COOL1

COOL2

FS1

— Alarm Relay (24-v), 5-va Maximum

— Thermostat Stage 1 (24-v)

— Thermostat Stage 2 (24-v)

— Fan Status Switch (24-v)

b. Incoming wire size range for terminal block with MCA from

175.1 amps to 420 amps is 2 AWG to 600 kcmil.

c. Incoming wire size range for non-fused disconnect with MCA

up to 100 amps is 14 AWG to 1/0.

d. Incoming wire size range for non-fused disconnect with MCA

from 100.1 amp to 200 amps is 6 AWG to 350 kcmil.

e. Incoming wire size range for non-fused disconnect with MCA

from 200.1 amp to 450 amps is 3/0 to 500 kcmil.

LLSV

LVT

— Liquid Line Solenoid Valve

— Low Voltage Terminal

MAT

— Mixed Air Temperature Sensor

— Return Air Temperature Sensor

— Set Point Adjustment (T-56, T-59)

— Supply Air Temperature Sensor

— Space Temperature Sensor (T-55, T-56, T-59)

Field Control Wiring

RAT

SAT

4. Terminals 1 and 2 of the LVT are for the alarm relay. The maxi-

mum load allowed for the alarm relay is 5-va sealed and 10-va

inrush at 24-v. Field power supply is not required.

SPT

5. Refer to certified dimensional drawings for exact locations of

the main power and control power entrance locations.

6. Terminals 24, 25, and 2 of the LVT are for the control of the

field-supplied LLSV. The maximum load allowed for the LLSV

is 15-va sealed and 30-va inrush at 24-v. Field power supply is

not required.

7. LLSV (24-v) should be 15-va maximum per valve as required.

8. Installation of fan status switch (FS1) is recommended.

9. The contacts for remote ON/OFF, fan status, and demand limit

options must be rated for dry circuit application capable of han-

dling a 24-vac load up to 50 mA.

NOTES:

1. Factory wiring is in accordance with UL 1995 standards. Field

modifications or additions must be in compliance with all appli-

cable codes.

2. All units or modules have single point primary power connec-

tion. Main power must be supplied from a field or factory-

supplied disconnect.

3. Wiring for main field supply must be rated 75 C. Use copper

conductors only.

Display Module Usage

Comf

SCROLLING MARQUEE DISPLAY — This device is the

keypad interface used for accessing unit information, reading

sensor values, and testing the unit. See Fig. 18. The scrolling

marquee display is a 4-key, 4-character, 16-segment LED

(light-emitting diode) display. Eleven mode LEDs are located

on the display as well as an Alarm Status LED. See Appendix

A — Display Tables for further details.

Link

Alar

Status

vic

res

ints

tpo

Inp

tpu

MODE

Run Status

Service Test

Temperature

nfig

tio

tin

Pressures

Setpoints

TER

Alarm Status

Inputs

Outputs

Configuration

Time Clock

Operating Modes

Alarms

ESCAPE ENTER

Fig. 18 — Scrolling Marquee Display

Fig. 19 — Accessory Navigator Display Module

The scrolling marquee display module provides the user in-

terface to the ComfortLink™ control system. The display has

Once within a Mode or sub-mode, a “>” indicates the cur-

rently selected item on the display screen. Pressing the

up and down arrow keys, an

key, and an

ENTER

ESCAPE

key. These keys are used to navigate through the different lev-

els of the display structure. See Table 2. Press the

and

keys simultaneously will put the Nav-

ESCAPE

ENTER

igator module into expanded text mode where the full meaning

of all sub-modes, items and their values can be displayed. Press-

ESCAPE

key until the display is blank to move through the top 11 mode

levels indicated by LEDs on the left side of the display.

ing the

and

keys when the display says

ESCAPE

ENTER

‘Select Menu Item’ (Mode LED level) will return the Navigator

module to its default menu of rotating display items (those items

in Run StatusVIEW). In addition, the password will be dis-

abled, requiring that it be entered again before changes can be

Pressing the

and

keys simultaneously

ENTER

ESCAPE

will scroll a clear language text description across the display

indicating the full meaning of each display acronym. Pressing

the

and

keys when the display is blank

ENTER

ESCAPE

made to password protected items. Press the

exit out of the expanded text mode.

key to

ESCAPE

(Mode LED level) will return the scrolling marquee display to

its default menu of rotating display items. In addition, the pass-

word will be disabled requiring that it be entered again before

changes can be made to password protected items. Clear lan-

guage descriptions will be displayed in English.

NOTE: When the Language Selection (Configuration

DISPLANG), variable is changed, all appropriate display

expansions will immediately change to the new language. No

power-off or control reset is required when reconfiguring

languages.

When a specific item is located, the item name appears on the

left of the display, the value will appear near the middle of the

display and the units (if any) will appear on the far right of the

When a specific item is located, the display will flash show-

ing the operator, the item, followed by the item value and then

followed by the item units (if any). Press the

stop the display at the item value. Items in the Configuration

and Service Test modes are password protected. The display

will flash PASS and WORD when required. Use the

key to

ENTER

display. Press the

key at a changeable item and the val-

ENTER

ue will begin to flash. Use the up and down arrow keys to change

the value, and confirm the value by pressing the key.

ENTER

and arrow keys to enter the 4 digits of the password. The

ENTER

default password is 1111.

Changing item values or testing outputs is accomplished in

the same manner. Locate and display the desired item. Press

so that the item value flashes. Use the arrow keys to

ENTER

Changing item values or testing outputs is accomplished in

the same manner. Locate and display the desired item. Press

change the value or state and press the

it. Press the

structure. Repeat the process as required for other items.

key to accept

to stop the display at the item value. Press the

ENTER

key to return to the next higher level of

ESCAPE

key again so that the item value flashes. Use the

ENTER

arrow keys to change the value or state of an item and press the

key to accept it. Press the key and the

ENTER

ESCAPE

Items in the Configuration and Service Test modes are pass-

word protected. The words Enter Password will be displayed

when required, with 1111 also being displayed. The default

password is 0111. Use the arrow keys to change the number

item, value, or units display will resume. Repeat the process as

required for other items.

ACCESSORY NAVIGATOR™ DISPLAY MODULE —

The Navigator module provides a mobile user interface to the

ComfortLink™ control system, which is only available as a

and press

to enter the digit. Continue with the re-

ENTER

maining digits of the password. The password can only be

changed through CCN operator interface software such as

ComfortWORKS^®, ComfortVIEW™ and Service Tool.

field-installed accessory. The display has up and down arrow

keys, an

key, and an

key. These keys are

ESCAPE

used to navigate through the different levels of the display

structure. Press the key until ‘Select a Menu Item’

ENTER

ESCAPE

is displayed to move through the top 11 mode levels indicated

by LEDs on the left side of the display. See Fig. 19.

Adjusting the Contrast — The contrast of the display can be

adjusted to suit ambient conditions. To adjust the contrast of

view screen. Pressing the up and down arrow keys simultane-

ously allows the user to adjust the display brightness. Use the

up or down arrow keys to adjust screen brightness. Press

the Navigator module, press the

key until the dis-

ESCAPE

play reads, “Select a menu item.” Using the arrow keys move

to accept the change. The Navigator module will

ENTER

to the Configuration mode. Press

this mode. The display will read:

to obtain access to

keep this setting as long as it is plugged in to the LEN bus.

ENTER

Main Base Board (MBB) — See Fig. 20. The MBB is

the heart of the ComfortLink control system. It contains the

major portion of operating software and controls the operation

of the machine. The MBB continuously monitors input/output

channel information received from its inputs and from all other

modules. The MBB receives inputs from the discharge and

suction pressure transducers, current sensor boards (CSB) and

thermistors. See Table 3. The MBB also receives the discrete

inputs from the thermostat contacts and other status switches.

See Table 4. The MBB also controls several outputs. Informa-

tion is transmitted between modules via a 3-wire communica-

tion bus or LEN (Local Equipment Network). The CCN (Car-

rier Comfort Network^®) bus is also supported. Connections to

both LEN and CCN buses are made at the LVT (low voltage

terminal) terminal strip.

> TEST OFF

METR OFF

LANG ENGLISH

Pressing

will cause the “OFF” to flash. Use the up

ENTER

or down arrow to change “OFF” to “ON”. Pressing

ENTER

will illuminate all LEDs and display all pixels in the view

screen. Pressing and simultaneously

ESCAPE

ENTER

allows the user to adjust the display contrast. Use the up or

down arrows to adjust the contrast. The screen’s contrast will

change with the adjustment. Press

change. The Navigator module will keep this setting as long as

it is plugged in to the LEN bus.

to accept the

ENTER

Adjusting the Backlight Brightness — The backlight of the

display can be adjusted to suit ambient conditions. The factory

default is set to the highest level. To adjust the backlight of the

Current Sensor Board (CSB) — The CSB is used to

monitor the status of the compressors by measuring current and

providing an analog input to the main base board (MBB) or

compressor expansion module (CXB).

Navigator module, press the

key until the display

ESCAPE

reads, “Select a menu item.” Using the arrow keys move to the

Energy Management Module (EMM) — The EMM

module is available as a factory-installed option or as a field-

installed accessory. The EMM module receives 4 to 20 mA

inputs for the percent capacity, temperature reset, cooling set

point, and demand limit functions. The EMM module also re-

ceives the switch inputs for the field-installed 2-stage demand

limit and when two thermostats are used for one unit. The

EMM module communicates the status of all inputs with the

MBB, and the MBB adjusts the control point, capacity limit,

and other functions according to the inputs received.

Configuration mode. Press

mode. The display will read:

> TEST OFF

to obtain access to this

ENTER

METR OFF

LANG ENGLISH

will cause the “OFF” to flash. Use the up

Pressing

ENTER

or down arrow keys to change “OFF” to “ON”. Pressing

will illuminate all LEDs and display all pixels in the

ENTER

Table 2 — Scrolling Marquee Display Menu Structure*

RUN

STATUS

SERVICE

TEST

SET

POINTS

TIME

CLOCK

OPERATING

MODES

MODE

TEMPERATURES PRESSURES

INPUTS OUTPUTS CONFIGURATION

ALARMS

Manual

Mode

On/Off

(TEST)

Auto

Display

(VIEW)

Unit

Temperatures

(UNIT)

Ckt A

Pressures

(PRC.A)

Unit

Discrete

(GEN.I)

Unit

Discrete

(GEN.O)

Cooling

(COOL)

Display

(DISP)

Unit Time

(TIME)

Modes

(MODE)

Current

(CRNT)

Machine

Hours/Starts

(RUN)

Unit

Outputs

(OUTS)

Ckt A

Temperatures

(CIR.A)

Ckt B

Pressures

(PRC.B)

Head

Pressure

(HEAD)

Reset

Alarms

(RCRN)

Ckt A/B

(CRCT)

Ckt A

(CIR.A)

Unit Configuration

(UNIT)

Unit Date

(DATE)

Task State

(TSKS)

Daylight

Saving

Time

Compressor Ckt A Comp

Ckt B

Temperatures

(CIR.B)

Unit

Analog

(4-20)

Alarm

History

(HIST)

Ckt B

(CIR.B)

CCN Network

(CCN)

Run Hours

(HOUR)

Tests

(CMPA)

(DST)

Local

Holiday

Schedules

(HOL.L)

Compressor Ckt B Comp

Options 1

(OPT1)

Starts

Tests

(STRT)

(CMPB)

Preventive

Maintenance

(PM)

Schedule

Number

(SCH.N)

Options 2

(OPT2)

SUB-MODE

Local

Software

Version

(VERS)

Motormaster

(M.MST)

Schedule

Number

(SCH.L)

Reset Cool

Temperature

(RSET)

Schedule

Overide

(OVR)

Set Point Select

(SLCT)

Service

Configuration

(SERV)

Broadcast

Configuration

(BCST)

LEGEND

Ckt

—

Circuit

*Throughout this text, the location of items in the menu structure will be described in

the following format:

^{Item Expansion (Mode Name}^{Sub-mode Name}^ITEM)

RED LED - STATUS

GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

YELLOW LED -

CCN (CARRIER COMFORT NETWORK)

INSTANCE JUMPER

CEPL130346-01

K11

K10

STATUS

J10

LEN

CCN

Fig. 20 — Main Base Board

Table 3 — Thermistor Designations

positions, the unit is allowed to operate and respond to the

scheduling configuration, CCN configuration and set point

data. See Fig. 21.

THERMISTOR INPUT

Return Air (Accessory)

PIN CONNECTION POINT

MBB J8-11,12; LVT 19,20

MBB J8-12,13; LVT 11,19

Supply Air (Accessory)

Emergency On/Off Switch — The Emergency On/Off

switch should only be used when it is required to shut the

unit off immediately. Power to the MBB, CXB, AUX, EMM,

and scrolling marquee display is interrupted when this switch is

off and all outputs from these modules will be turned off.

Compressor Return Gas

Temperature A

MBB J8-1,2

Compressor Return Gas

Temperature B

MBB J8-3,4

MBB J8-7,8

Outdoor Air Temperature

Discharge Temperature

(Digital Option Only)

AUX J6-1,2

Board Addresses — The main base board (MBB) has a

3-position Instance jumper that must be set to ‘1.’ All other

boards have 4-position DIP switches. All switches are set to

‘On’ for all boards.

Space Temperature (Accessory)

MBB J8-5,6; LVT 21,22

Table 4 — Switch Inputs

SWITCH INPUT

Thermostat Y1 (Accessory)

Thermostat Y2 (Accessory)

Fan Status 1 (Accessory)

Fan Status 2 (Accessory)

Remote On/Off

PIN CONNECTION POINT

LVT 12,18

Control Module Communication

RED LED — Proper operation of the control boards can be

visually checked by looking at the red status LEDs

(light-emitting diodes). When operating correctly, the red status

LEDs should be blinking in unison at a rate of once every

2 seconds. If the red LEDs are not blinking in unison, verify

that correct power is being supplied to all modules. Be sure that

the main base board (MBB) is supplied with the current soft-

ware. If necessary, reload current software. If the problem still

persists, replace the MBB. A red LED that is lit continuously or

blinking at a rate of once per second or faster indicates that the

board should be replaced.

LVT 15,18

LVT 16,18

LVT 17,18

LVT 13,14

High Pressure Switch A

High Pressure Switch B

MBB J6-4

MBB J6-6

Compressor Expansion Module (CXB) — The

CXB is only used on unit sizes 070-100 to provide additional

inputs and outputs for fans and compressors when the unit has

more than 4 compressors.

AUX Board (AUX) — The AUX is used with the digital

scroll option and the low ambient head pressure option. It pro-

vides additional inputs and outputs for digital scroll control

along with analog outputs to control head pressure control fan

speeds.

GREEN LED — The MBB has one green LED. The Local

Equipment Network (LEN) LED should always be blinking

whenever power is on. All other boards have a LEN LED

which should be blinking whenever power is on. Check LEN

connections for potential communication errors at the board J3

and/or J4 connectors. Communication between modules is

accomplished by a 3-wire sensor bus. These 3 wires run in

parallel from module to module. The J4 connector on the MBB

provides both power and communication directly to the

marquee display only.

Enable/Off/Remote Contact Switch — The Enable/

Off/Remote Contact switch is a 3-position switch used to

control the unit. When switched to the Enable position, the unit

is under its own control. Move the switch to the Off position to

shut the unit down. Move the switch to the Remote Contact po-

sition and a field-installed dry contact can be used to start the

unit. The contacts must be capable of handling a 24 vac, 50 mA

load. In the Enable and Remote Contact (dry contacts closed)

YELLOW LED — The MBB has one yellow LED. The

Carrier Comfort Network (CCN) LED will blink during times

of network communication.

SCROLLING MARQUEE

DISPLAY

CB1

CB2

CB3

REMOTE

CONTROL

OFF

SW1 OFF

ENABLE

SW2

LEGEND

CB — Circuit Breaker

SW — Switch

ENABLE/OFF/REMOTE

CONTACT SWITCH

EMERGENCY

ON-OFF SWITCH

Fig. 21 — Scrolling Marquee, Enable/Off/Remote Contact Switch, and Emergency On/Off Switch Locations

4. The RJ14 CCN connector on LVT can also be used, but is

Carrier Comfort Network^®(CCN) Interface —

only intended for temporary connection (for example, a

The 38AP units can be connected to the CCN if desired. The

laptop computer running Service Tool).

communication bus wiring is a shielded, 3-conductor cable

with drain wire and is supplied and installed in the field. See

IMPORTANT: A shorted CCN bus cable will prevent some

Table 5. The system elements are connected to the communi-

routines from running and may prevent the unit from start-

cation bus in a daisy chain arrangement. The positive pin of

ing. If abnormal conditions occur, unplug the connector. If

each system element communication connector must be wired

conditions return to normal, check the CCN connector and

to the positive pins of the system elements on either side of it.

cable. Run new cable if necessary. A short in one section of

This is also required for the negative and signal ground pins of

the bus can cause problems with all system elements on the

each system element. Wiring connections for CCN should be

bus.

made at LVT. Consult the CCN Contractor’s Manual for fur-

ther information.

NOTE: Conductors and drain wire must be 20 AWG (Ameri-

can Wire Gage) minimum stranded, 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. Wire manufactured by Alpha (2413

or 5463), American (A22503), Belden (8772), or Columbia

(02525) meets the above mentioned requirements.

Table 5 — CCN Communication Bus Wiring

PART NO.

Regular Wiring

1895

MANUFACTURER

Plenum Wiring

Alpha

—

A48301

884421

—

M64430

—

American

Belden

Columbia

Manhattan

Quabik

A21451

8205

D6451

M13402

6130

It is important when connecting to a CCN communication

bus that a color coding scheme be used for the entire network

to simplify the installation. It is recommended that red be used

for the signal positive, black for the signal negative, and white

for the signal ground. Use a similar scheme for cables contain-

ing different colored wires.

At each system element, the shields of its communication

bus cables must be tied together. If the communication bus is

entirely within one building, the resulting continuous shield

must be connected to a ground at one point only. If the commu-

nication bus cable exits from one building and enters another,

the shields must be connected to grounds at the lightning

suppressor in each building where the cable enters or exits the

building (one point per building only). To connect the unit to

the network:

OPERATING DATA

Sensors — The electronic control uses 3 to 7 thermistors to

sense temperatures for controlling unit operation. See Table 3.

These sensors are outlined below. Three different thermistor

curves are utilized depending on the thermistor and the config-

uration of the input. The three different types are 5 kat 77 F

(25 C), 10 kat 77 F (25 C), and 86 k at 77 F (25 C). See

Thermistors section on page 49 for additional information.

RETURN AIR TEMPERATURE (RAT) ACCESSORY

(Part No. 33ZCSENSAT) — A return air temperature sensor

is required for unit sizes 040-100 and all units equipped with

the digital scroll option. The sensor is field installed in the

indoor unit and wired to the LVT of the unit to measure the air

temperature entering the evaporator coil. The sensor should be

located directly in front of the evaporator coil after an outside

air intake.

1. Turn off power to the control box.

2. Cut the CCN wire and strip the ends of the red (+), white

(ground), and black (–) conductors. (Substitute appropri-

ate colors for different colored cables.)

3. Connect the red wire to (+) terminal on LVT of the plug,

the white wire to COM terminal, and the black wire to the

(–) terminal.

The RAT sensor consists of a thermistor encased within a

stainless steel probe. See Fig. 22. The sensor probe is 6 in.

nominal length with 114 in. of unshielded, 2-conductor

18 AWG twisted-pair cables. The sensor temperature range is

–40 to 245 F with a nominal resistance of 10,000 ohms at 77 F.

The sensor has with an accuracy of ±0.36 F.

3.90

3.00

RED(+)

.175 DIA

x .600

WHT(GND)

CCN COM

BLK(-)

SEN

.08

SW1

.39

BRN (GND)

BLU (SPT)

SENSOR WIRING

FOAM GASKET

.40'' O.D.

.250 .01 Dia

5.5 .5

NOTE: All dimensions

shown in inches.

PLENUM RATED CABLE

114''

Fig. 23 — Space Temperature Sensor

Typical Wiring (33ZCT55SPT)

Fig. 22 — 33ZCSENSAT Sensor

SUPPLY AIR TEMPERATURE (SAT) ACCESSORY

(33ZCSENSAT) — A supply air temperature sensor is

required for unit sizes 040-100 and all units equipped with the

digital scroll option. The SAT sensor consists of a thermistor

encased within a stainless steel probe. See Fig. 22. The SAT

sensor probe is 6 in. nominal length with 114 in. of unshielded,

2-conductor 18 AWG twisted-pair cables. The sensor tempera-

ture range is –40 to 245 F with a nominal resistance of

10,000 ohms at 77 F. The sensor has an accuracy of ±0.36 F.

RED(+)

WHT(GND)

CCN COM

BLK(-)

SET

SEN

NOTE: The sensor must be mounted in the discharge of the

unit, downstream of the cooling coil and before any heating

coil or heat exchanger if reheat is utilized. Be sure the probe tip

does not come in contact with any of the unit surfaces.

SW1

BLK

(T56)

BRN (GND)

BLU (SPT)

SENSOR WIRING

JUMPER

TERMINALS

AS SHOWN

COMPRESSOR RETURN GAS TEMPERATURE SEN-

SOR (RGT) — These sensors are factory installed in a fric-

tion fit well located in the suction line of each circuit. They are

a 5 k thermistor connected to the main base board.

OUTDOOR-AIR TEMPERATURE SENSOR (OAT) —

This sensor is factory installed on a bracket which is inserted

through the base pan of the unit on the unit sizes 025-060 and

mounted to the back of the control box on the unit sizes 070-

100. This sensor is a 5 k thermistor connected to the main

base board.

Cool

Warm

Fig. 24 — Space Temperature Sensor

Typical Wiring (33ZCT56SPT)

The sensor should be mounted approximately 5 ft from the

floor in an area representing the average temperature in the

space. Allow at least 4 ft between the sensor and any corner.

Mount the sensor at least 2 ft from an open doorway.

DISCHARGE

TEMPERATURE

THERMISTOR

(DTT) — This sensor is only used on units with a digital

compressor. The sensor is mounted on the discharge line close

to the discharge of the digital compressor. It attaches to the dis-

charge line using a spring clip and protects the system from

high discharge gas temperature when the digital compressor is

used. This sensor is a 86 k thermistor connected to the AUX

board.

To connect the space temperature sensor (Fig. 25):

1. Use a 20 gage 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 set

point adjustment connections. The standard CCN

communication cable may be used. If the set point

adjustment (slidebar) is not required, then an unshielded,

18 or 20 gage, two-conductor, twisted pair cable may be

used. Connect one wire of the twisted pair to one SEN

terminal and connect the other wire to the other SEN ter-

minal located under the cover of the space temperature

sensor.

SPACE TEMPERATURE SENSOR (SPT) — The space

temperature sensors are used to measure the interior

temperature of a building. The following three types of SPT

sensors are available:

• Space temperature sensor (33ZCT55SPT) with timed

override button (see Fig. 23)

• Space temperature sensor (33ZCT56SPT) with timed

override button and set point adjustment (see Fig. 24)

• Space temperature sensor (33ZCT59SPT) with occu-

pancy override button, set point adjustment slidebar, and

LCD (liquid crystal display) display

2. Connect the other ends of the wires to terminals 21 and

22 on LVT located in the unit control box.

3. Connect the T56 set point adjustment between the SET

terminal and LVT terminal 23.

Units on the CCN can be monitored from the space using

the RJ11 connector provided with the space sensor, if desired.

To wire the RJ11 connector into the CCN (Fig. 26):

SPT

SENSOR

IMPORTANT: The cable selected for the RJ11 connector

wiring MUST be identical to the CCN communication bus

wire used for the entire network. Refer to Table 5 for

acceptable wiring.

LVT

SEN

SET

1. Cut the CCN wire and strip ends of the red (+), white

(ground), and black (–) conductors. (If another wire color

scheme is used, strip ends of appropriate wires.)

2. Insert and secure the red (+) wire to terminal 5 of the

space temperature sensor terminal block.

3. Insert and secure the white (ground) wire to terminal 4 of

the space temperature sensor.

4. Insert and secure the black (–) wire to terminal 2 of the

space temperature sensor.

Fig. 25 — Typical SPT Wiring

T-55 SPACE

SENSOR

5. Connect the other end of the communication bus cable to

the remainder of the CCN communication bus.

NOTE: See Fig. 27 for space temperature averaging.

CCN+

TO CCN

CCN GND

COMM 1

BUS (PLUG)

AT UNIT

CCN-

Fig. 26 — CCN Communications Bus Wiring to

Optimal Space Sensor RJ11 Connector

RED

BLK

RED

BLK

RED

BLK

RED

BLK

RED

BLK

SENSOR 1

SENSOR 2

SENSOR 3

SENSOR 4

SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION

RED

BLK

RED

BLK

RED

BLK

SENSOR 3

SENSOR 1

SENSOR 2

RED

BLK

RED

BLK

SENSOR 6

SENSOR 4

SENSOR 5

RED

BLK

RED

BLK

LEGEND

Factory Wiring

Field Wiring

SENSOR 8

SENSOR 9

SENSOR 7

SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION

Fig. 27 — Space Temperature Averaging

See VAV Supply Air Temperature Reset and Demand Limit

sections on pages 29 and 31 for further details.

Fan Status Input — A proof-of-fan operation is recom-

mended and needs to be field installed in the indoor unit. Sev-

eral different types of switches can be utilized, such as a differ-

ential pressure switch located across the indoor fan or auxiliary

contacts on an indoor fan contactor.

CAUTION

Care should be taken when interfacing with other manufac-

turer’s control systems due to possible power supply

differences, full wave bridge versus half wave rectification.

The two different power supplies cannot be mixed.

ComfortLink™ controls use half wave rectification. A

signal isolation device should be utilized if a full wave

bridge signal generating device is used.

Thermostat Input — A two-stage thermostat can be

used for constant volume applications to provide Y1 and Y2

cooling inputs.

Pressure Transducer Inputs — Each refrigerant cir-

cuit is equipped with a suction and discharge pressure trans-

ducer. The suction pressure transducers have a yellow body

with a pressure range of -6.7 to 420 psig while the discharge

transducers have a red body with a pressure range of 14.5 to

667 psig. These inputs connect to the MBB (main base board)

and are used to monitor the status of the unit and to ensure the

unit operates within the compressor envelope. The transducers

are used to protect the compressor from operating at too low or

too high of a pressure condition. In some cases, the unit may

not be able to run at full capacity. The MBB will automatically

reduce the capacity of a circuit as needed to maintain specified

maximum/minimum operating pressures.

Control — When mechanical cooling is required, the MBB

has the capability to control the unit capacity by staging multi-

ple scroll compressors and controlling the digital scroll com-

pressor operation. The control also checks on various other op-

eration parameters in the unit to make sure that safeties are not

exceeded and the compressors are reliably operated.

The ComfortLink™ control system offers two basic control

approaches to mechanical cooling; constant volume operation

for 2 stages of cooling or VAV operation for multiple stages

of cooling. In addition to these methods of control, the

ComfortLink control offers the ability to run multiple stages of

cooling for either a space temperature sensor or thermostat

control by controlling the unit to either a low or high cool set

point. The control type ConfigurationOPT2C.TYP de-

termines the selection of the type of cooling control as well as

the method for selecting a cooling mode.

Energy Management Module (Fig. 28) — The

energy management module (EMM) is a factory-installed op-

tion (FIOP) or field-installed accessory used for the following

types of temperature reset, demand limit, and capacity control

features:

•

4 to 20 mA temperature reset

4 to 20 mA cooling set point

SETTING UP THE SYSTEM

4 to 20 mA desired capacity set point

4 to 20 mA demand limit

Machine Control Type (ConfigurationOPT2 C.TYP)

— The most important cooling control configuration is located

under Configuration OPT2. This configuration defines the

method and control source responsible for selecting a cooling

mode. The configuration also determines the method by which

compressors are staged. Control types are:

Discrete inputs for 2-step demand limit (requires field-

supplied dry contacts capable of handling a 24 vac,

50 mA load)

•

Discrete inputs for units with dual thermostats

NOTE: A field-supplied 4 to 20 mA signal generator is re-

quired for use with the EMM.

• C.TYP = 1 (VAV-RAT) configuration refers to standard

VAV operation.

CEBD430351-0396-01C

LEN

STATUS

TEST 2

GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

ADDRESS

DIP SWITCH

RED LED - STATUS

Fig. 28 — Energy Management Module

• C.TYP = 3 (TSTAT-MULTI) configuration will force

the MBB to monitor the thermostat inputs to make a

determination of mode. Unlike traditional 2-stage ther-

mostat control, the unit is allowed to use multiple stages

of cooling control and perform VAV style operation. The

control will be able to call out a low set point or a high

set point to maintain supply air temperature. (Required

for 025-030 units with digital scroll option and 040-100

units with two-stage thermostat control.)

supply air depending on space temperature vs space

temperature set point. The control uses SPS.P, LC.ON,

HC.ON, and LC.OF to determine the leaving set point.

LC.ON and HC.ON are added to the space temperature

set point to determine when cooling mode will begin and

when CSP1 and CSP2 will be used for leaving set point.

Based on LC.OF, the control point transitions between

CSP1 and CSP2. LC.OF is used to calculate the space tem-

perature at which control point is raised based on space tem-

perature vs space temperature set point (SPS.P) plus

LC.ON minus LC.OF. The control point transition from

CSP2 to CSP1 occurs when space temperature is below

LC.OF divided by 2.

• C.TYP = 4 (TSTAT-2STG) configuration will force the

MBB to monitor the thermostat inputs to make a deter-

mination of mode.

• C.TYP = 5 (SPT-MULTI) configuration will force the

MBB to monitor a space temperature sensor to make a

determination of mode. Unlike traditional 2-stage space

temperature control, the unit is allowed to use multiple

stages of cooling control and perform VAV style opera-

tion. The control will be able to call out a low set point or

a high set point to maintain supply air temperature.

• C.TYP = 7 (% CAPACITY) configuration will force the

MBB to monitor the 4-20 cooling demand CL.MA input

and translate this into desired % capacity for the unit.

• C.TYP = 9 (VAV-SETPOINT) configuration will force

the MBB to monitor the 4-20 cooling demand CL.MA

input. This value will be translated into a desired leav-

ing-air set point ranging from 40 to 80 F. The control will

translate the input linearly with 4 ma equal to 40 F set

point and 20 mA equal to 80 F set point.

For example (see Fig. 29):

Given: SPS.P = 72 F, LC.ON = 1, HC.ON = 3,

LC.OF = 2 F, CSP1 = 60 F, and CSP2 = 55 F

If space temperature equals 73 F (72+1) (Low Cool)

cooling will begin and control set point equals 60 F

(CSP1).

If space temperature is greater than 76 F (72+1+3 = 76)

(High Cool), control point set point would equal 55 F

(CSP2).

If space temperature falls below 72 F (73-2/2) (Low

Cool minus LC.OF/2), control point transitions back to

60 F CSP1 if space continues to fall below 71 F (73-2)

(Low Cool minus LC.OF), the unit is shut off.

Unit Capacity Control Based on Unit Type — The MBB

uses several set points to control capacity depending on unit

type. The set points are located in the set point area of the dis-

play SetPointsCOOL. Refer to Table 6 and the following

descriptions.

76 F

Hi Cool Start

H.C.ON

73 F

Lo Cool Start

Table 6 — Unit Capacity Control

L.C. OF L.C. OF/2

ITEM

DESCRIPTION

RANGE UNITS DEFAULT

L.C.ON

CSP1 Cooling Set Point 1

CSP2 Cooling Set Point 2

40-80

65-80

72 F

Hi Cool End 72 F

A48-7701

SPS.P Space Temperature Cooling Set

Point

Cooling Setpoint

L.C.ON Demand Level Low Cool On

H.C.ON Demand Level (+) High Cool On 0.5-20.0

L.C.OF Demand Level (–) Low Cool Off 0.5-2

–1-2

1.5

0.5

Lo Cool End 71 F

• C.TYP = 1 (VAV-RAT) is a capacity control routine that

controls compressor capacity to supply air temperature.

The MBB will attempt to control leaving temperature to

the control point (CTPT) which equals CSP1 plus any

reset which is being applied.

• C.TYP = 3 (TSTAT-MULTI) configuration will force the

MBB to monitor the thermostat inputs to make a deter-

mination of control point (CTPT). The control will vary

the control point based on Y1 and Y2 inputs. When Y1 is

closed CSP1 will be used and when Y2 is closed CSP2

will be used as the supply air temperature set point.

CSP1 should be greater than CSP2.

• C.TYP = 4 (TSTAT-2STG) configuration will force the

MBB to monitor the thermostat inputs to make a deter-

mination of mode and capacity. If Y1 input is closed,

50% of the unit capacity will be energized and if Y2 is

closed, 100% of the unit capacity will be energized.

Fig. 29 — Space Temperature vs.

Space Temperature Set Point

• C.TYP = 7 (% CAPACITY) configuration will force the

MBB to monitor the input 4-20 cooling demand CL.MA

and translate this into desired % capacity for the unit.

The control will attempt to match the desired capacity

insuring the unit operates the compressor within com-

pressor safeties and timeguards. (Requires the EMM

option or accessory.)

• C.TYP = 9 (VAV-SETPOINT) configuration will force

the MBB to operate as a VAV unit and control capacity to

meet supply air temperature. The control point is devel-

oped from the 4-20 cooling demand CL.MA input value.

The 4 to 20 mA input will be translated into a desired

control point ranging from 40 to 80 F. The control will

translate the input linearly with 4 mA equal to 40 F set

point and 20 mA equal to 80 F set point. (Requires the

EMM option or accessory.)

NOTE: This is not a preferred method of control for units

with greater than 2 stages of capacity

• C.TYP = 5 (SPT-MULTI) configuration will force the

MBB to monitor the thermostat inputs to determine

mode and cooling set point as the unit is controlled by

space temperature vs space temperature set point SPS.P.

Unlike traditional 2-stage thermostat control, the unit is

allowed to use multiple stages of cooling control and per-

form VAV style operation. The control will be able to call

out a low set point (CSP1) or high set point (CSP2) for

Capacity Control Logic when Control is Controlling to Sup-

ply Temperature — The control system cycles compressors,

hot gas bypass and the digital compressor to maintain the sup-

ply temperature at or close to the control point of the unit. The

SAT and RAT sensors are used by the main base board (MBB)

to determine the temperature drop across the evaporator and

are used in determining the optimum time to add or subtract ca-

pacity stages. The CSP set points can be automatically reset by

the return temperature, space, or outdoor-air temperature reset

features. It can also be reset from an external 4 to 20 mA signal

(requires energy management module factory-installed option

or field-installed accessory).

The control has an automatic lead-lag feature built in which

determines the wear factor (combination of starts and run

hours) for each compressor. If all compressors are off and less

than 30 minutes has elapsed since the last compressor was

turned off, the wear factor is used to determine which compres-

sor to start next. As additional stages of compression are re-

quired, the processor control will add them. If a circuit is to be

stopped, the compressor with the lowest wear factor will be

shut off first. See Table 7 for compressor size information and

Table 8 for compressor loading sequence.

The capacity control algorithm runs every 30 seconds. The

algorithm attempts to maintain the control point at the desired

set point. Each time it runs, the control reads the entering and

leaving temperatures. The control determines the rate at which

conditions are changing and calculates 2 variables based on

these conditions. Next, a capacity ratio is calculated using the

2 variables to determine whether or not to make any changes to

the current stages of capacity. This ratio value ranges from

–100 to +100%. If the next stage of capacity is a compressor,

the control starts (stops) a compressor when the ratio reaches

+100% (-100%). A delay of 90 seconds occurs after each ca-

pacity step change. Refer to Table 8.

Table 7 — Compressor Size Information

CIRCUIT A (Nominal hp)

CIRCUIT B (Nominal hp)

UNIT SIZE

Compressor A1

Compressor A2

Compressor A3

Compressor B1

Compressor B2

Compressor B3

38APS025

38APD025

38APS027

38APD027

38APS030

38APD030

38APS040

38APD040

38APS050

38APD050

38APD060

38APD070

38APD080

38APD090

38APD100

—

Table 8 — Part Load Data Percent

LOADING SEQUENCE A

LOADING SEQUENCE B

CONTROL

STEPS

38AP UNIT SIZE

% Displacement

Compressor

% Displacement

Compressor

—

38APS025-030

38APD025-030

100

A1,A2

100

A1, B1

100

A1,B1

—

38APS040,050

38APD040

A1,A2

100

A1,A2,A3

A1,B1

A1,A2,B1

A1,A2,B1,B2

A1,B1

A1,B1,B2

A1,A2,B1,B2

100

A1,B1

38APD050,060

38APD070

A1,A2,B1

A1,A2,B1,B2

A1,B1,B2

A1,A2,B1,B2

100

A1,B1

A1,A2,B1

A1,B1,B2

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,A2,B1,B2

A1,A2,B1,B2,B3

100

A1,B1

38APD080

38APD090

A1,A2,B1

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,B1,B2

A1,A2,B1,B2

A1,A2,B1,B2,B3

100

A1,B1

A1,A2,B1

A1,B1,B2

A1,A2,B1,B2

A1,A2,A3,B1,B2,B3

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,A2,A3,B1,B2,B3

100

A1,B1

A1,A2,B1

A1,B1,B2

38APD100

A1,A2,B1,B2

A1,A2,A3,B1,B2

A1,A2,A3,B1,B2,B3

A1,A2,B1,B2

A1,A2,B1,B2,B3

A1,A2,A3,B1,B2,B3

100

NOTES:

2. When unit is equiped with digital scroll option, sequence A is always

used.

1. These capacity steps may vary due to different capacity staging

sequences.

MINUTES LEFT FOR START — This value is displayed

only in the network display tables (using Service Tool,

ComfortVIEW™ or ComfortWORKS^®software) and

represents the amount of time to elapse before the unit will start

its initialization routine. This value can be zero without the

machine running in many situations. This can include being

unoccupied, ENABLE/OFF/REMOTE CONTACT switch in

the OFF position, CCN not allowing unit to start, Demand

Limit in effect, no call for cooling due to no load, and alarm or

alert conditions present. If the machine should be running and

none of the above are true, a minimum off time (DELY, see

below) may be in effect. The machine should start normally

once the time limit has expired.

close to the set point (within an adjustable deadband) and mov-

ing toward the set point.

Ramp Loading — The ramp loading control (Configuration

SLCTCRMP) limits the rate of change of supply temper-

ature. If the unit is in a Cooling mode and configured for Ramp

Loading, the control makes 2 comparisons before deciding to

change stages of capacity. The control calculates a temperature

difference between the control point and supply temperature. If

the difference is greater than 4° F (2.2° C) and the rate of

change (°F or °C per minute) is more than the configured Cool-

ing Ramp Loading value (CRMP), the control does not allow

any changes to the current stage of capacity.

Minimum Load Control — If equipped, the minimum load

control valve is energized only when one compressor on the

circuit is running and the unit is unloading.

Low Saturated Suction Protection — The control will try to

prevent shutting a circuit down due to low saturated suction

conditions by removing stages of capacity. See Alerts section.

MINUTES

OFF

TIME

(ConfigurationOPT2

DELY) — This user-configurable time period is used by

the control to determine how long unit operation is delayed

after power is applied/restored to the unit. Typically, this time

period is configured when multiple machines are located on a

single site. For example, this gives the user the ability to pre-

vent all the units from restarting at once after a power failure.

A value of zero for this variable does not mean that the unit

should be running.

Head Pressure Control — The main base board

(MBB) controls the condenser fans to maintain the lowest

condensing temperature possible, and thus the highest unit

efficiency. The MBB uses the saturated condensing tempera-

ture input from the discharge pressure transducer and outside

air temperature sensor to control the fans. If OAT is greater

than 70 F before a circuit is starting, then all condenser fan

stages will be energized. A fan stage is increased based on

SCT. When the highest SCT of both circuits is greater than fan

on set point, then an additional stage of fan will be added to the

current fan stage. Fan On Set Point (F.ON) equals Head Set

Point ON (115 F) except after a fan stage increase when Head

Set Point is increased by Fan Stage Delta (10 F). A fan stage is

decreased when the SCTs of both circuits are less than fan off

set point for two minutes. Fan Off Set Point (F.OFF) equals

Head Set Point OFF (–72 F). Table 9 shows the number of fan

stages, contactors energized and the fans that are on during the

fan stage. Unit sizes 025 to 060 have common fan control. Unit

sizes 070 to 100 have some fans that are common and some

that are controlled individually. Figure 30 shows the location

of each fan and compressor within the unit.

MOTORMASTER^®V OPTION — For low-ambient opera-

tion, the first stage of fans is equipped with the Motormaster V

head pressure controller option or accessory. For units with

common fans, the control will control the Head Pressure Set-

point (–10 F) and the highest SCT to try to maintain it at 100 F.

Unit sizes 070 to 100 have one Motormaster V for each circuit

and the control tries to maintain SCT at 100 F for the circuit.

The controller is given an ON command with the first stage of

fan and adjusts fan speed.

NOTE: If the unit has digital scroll or hot gas bypass, circuit A

is always lead.

LEAD/LAG DETERMINATION — This is a configurable

choice and is factory set to be automatic for all units. The value

can be changed to Circuit A or Circuit B leading as desired. Set

at automatic, the control will sum the current number of logged

circuit starts and one-quarter of the current operating hours for

each circuit. The circuit with the lowest sum is started first.

Changes to which circuit is the lead circuit and which is the lag

are also made when total machine capacity is at 100% or when

there is a change in the direction of capacity (increase or

decrease) and each circuit’s capacity is equal.

CAPACITY CONTROL OVERRIDES — The following over-

rides will modify the normal operation of the routine.

Deadband Multiplier — The user configurable deadband mul-

tiplier (ConfigurationSLCTZ.GN) has a default value of

1.0. The range is from 1.0 to 4.0. When set to other than 1.0,

this factor is applied to the capacity Load/Unload Factor. The

larger this value is set, the longer the control will delay between

adding or removing stages of capacity.

First Stage Override — If the current capacity stage is zero,

the control will modify the routine with a 1.2 factor on adding

the first stage to reduce cycling. This factor is also applied

when the control is attempting to remove the last stage of

capacity.

Slow Change Override — This control prevents the capacity

stages from being changed when the supply temperature is

Table 9 — Fan Stages

CIRCUIT A STAGES/COMMON FAN STAGES

CIRCUIT B FAN STAGES

Contactor Energized

38AP UNIT SIZE

Fan Stage

Contactor Energized

Fans Operating

Fan Stage

Fans Operating

Stage 1

Stage 2

Stage 1

Stage 2

Stage 3

Stage 1

Stage 2

Stage 3

Stage 4

FC1

OFM1

025-030

040,050

—

FC1,2

OFM1,2

FC1

FC2

FC1,2

FC1

FC2

FC1,2

FC1,2,3

OFM3

OFM1,2

OFM1,2,3

OFM3

OFM1,2

OFM1,2,3

OFM1,2,3,4

—

060

—

Stage 1*

Stage 2

Stage 3

Stage 1

Stage 2

FC2,4

FC1

OFM1,2

OFM3

Stage 1*

Stage 2

Stage 3

Stage 1

Stage 2

Stage 3

FC1,3

FC2

OFM3,4

OFM1

070

080

FC1,3

OFM3,4

FC2,4

OFM1,2

FC1

FC1,3

OFM5

OFM5,6,(2)

FC4

OFM3

OFM3,2,(6)

OFM3,1,2,(6)

FC3,4

FC2,3,4

Stage 1

Stage 2

Stage 3

Stage 4

Stage 5

Stage 6

FC4

FC1

FC4,1

FC4,3

FC1,3

FC4,1,3

OFM3

OFM5

Stage 1

Stage 2

Stage 3

Stage 4

Stage 5

Stage 6

FC4

FC2

FC4,2

FC4,3

FC2,3

FC4,2,3

OFM3

OFM1

OFM3,5

OFM3,1

090,100

OFM3,(2),4,6

OFM5,(2),4,6

OFM3,5,(2),4,6

OFM3,2,4,(6)

OFM1,2,4,(6)

OFM3,1,2,4,(6)

* Fan Stage 1 on unit size 070 is used only when ambient temperature is less than 32 F.

Outdoor Fan Layout – Top View

OFM1

OFM2

OFM1

OFM2

OFM3

OFM2

OFM4

Sizes 025-030

OFM1

Sizes 040, 050

OFM5

Sizes 060, 070

OFM1

OFM2

OFM3

OFM5

OFM3

OFM2

OFM6

OFM4

OFM6

Size 080

Sizes 090, 100

Compressor Layout Dual Circuit – Top View

Sizes 040-060

Sizes 025-030

Sizes 070, 080

Sizes 090, 100

Compressor Layout Single Circuit – Top View

Sizes 025-030

Sizes 040, 050

Fig. 30 — Compressor and Fan Location

demand limit control option. Because of this limitation, the unit

may not be able to produce the desired supply fluid tempera-

ture. Demand limit can be controlled by switch inputs or a 4 to

20 mA signal.

LOW TEMPERATURE COOLING (MD17) — Unit is in

Cooling mode and the rate of change of the supply fluid is neg-

ative and decreasing faster than -0.5° F per minute. Error be-

tween supply fluid and control point exceeds fixed amount.

Control will automatically unload the unit if necessary.

HIGH TEMPERATURE COOLING (MD18) — Unit is in

Cooling mode and the rate of change of the supply fluid is pos-

itive and increasing. Error between supply fluid and control

point exceeds fixed amount. Control will automatically load

the unit if necessary to better match the increasing load.

TIME GUARD ACTIVE (MDTG) — Compressor time

guard is active, preventing the compressor from starting.

HIGH SCT CIRCUIT A (MD21) — Unit is in a Cooling

mode and the saturated condensing temperature (SCT) is great-

er than the calculated maximum limit. No additional stages of

capacity will be added. Unit capacity may be reduced if SCT

continues to rise to avoid high-pressure switch trips by reduc-

ing condensing temperature.

HIGH SCT CIRCUIT B (MD22) — Unit is in a Cooling

mode and the saturated condensing temperature (SCT) is great-

er than the calculated maximum limit. No additional stages of

capacity will be added. Unit capacity may be reduced if SCT

continues to rise to avoid high-pressure switch trips by reduc-

ing condensing temperature.

Service Test — Both main power and control circuit

power must be on.

The Service Test function should be used to verify proper

operation of condenser fan(s), compressors, minimum load

valve solenoid (if installed), liquid line solenoid valve (if

installed), and remote alarm relay. To use the Service Test

mode, the Enable/Off/Remote Contact switch must be in the

OFF position. Use the display keys and Service Test Mode and

Sub-Mode Directory table in Appendix A to enter the mode

and display TEST. Press

twice so that OFF flashes.

ENTER

Enter the password if required. Use either arrow key to change

the TEST value to the ON position and press . Place

ENTER

the Enable/Off/Remote Contact switch in the ENABLE posi-

tion. The Service Test mode is now enabled. Press

ESCAPE

down key to enter the OUTS, COMPA or COMPB

and the

sub-mode.

Test the condenser fans, liquid line solenoid and alarm re-

lay by changing the item values from OFF to ON. These dis-

crete outputs are then turned off if there is no keypad activity

for 10 minutes. When testing the digital output the display can

be changed from 1 to 15 by using either the up or down arrow;

the number represents the cycle rate out of a 15 second duty cy-

cle that the output will be energized. If the cycle is set for 7, the

output will be energized 7 seconds out of every 15 seconds.

Test the compressor and minimum load valve solenoid (if in-

stalled) outputs in a similar manner. The minimum load valve

solenoids will be turned off if there is no keypad activity for

10 minutes. Compressors will stay on until they are turned off

by the operator. The Service Test mode will remain enabled for

as long as there is one or more compressors running. All safe-

ties are monitored during this test and they will turn a compres-

sor, circuit or the machine off if required. Any other mode or

sub-mode can be accessed, viewed, or changed during the

TEST mode. The STAT item (Run/StatusVIEW) will dis-

play "0" as long as the Service mode is enabled. The TEST

sub-mode value must be changed back to OFF before the unit

can be switched to Enable or Remote contact for normal

operation.

MINIMUM COMP ON TIME (MD23) — Cooling load

may be satisfied, however control continues to operate com-

pressor to ensure proper oil return. This may be an indication of

oversized application, low fluid flow rate or low loop volume.

LOW SOUND MODE (MD25) — Not applicable.

Operation of Machine Based on Control

Method — Machine On/Off control is determined by

the

configuration

the

control

method

(ConfigurationOPT2CTRL). With the control method

set to 0, simply switching the Enable/Off/Remote Contact

switch to the Enable or Remote Contact position (external con-

tacts closed) will put the unit in an occupied state. The control

mode (Operating ModesMODE) will be 1 (OFF LOCAL)

when the switch is Off and will be 5 (ON LOCAL) when in the

Enable position or Remote Contact position with external con-

tacts closed.

Operating Modes

RAMP LOAD LIMITED (MD05) — Ramp load (pull-

down) limiting is in effect. In this mode, the rate at which sup-

ply fluid temperature is dropped is limited to a predetermined

value to prevent compressor overloading. See Cooling Ramp

Loading (ConfigurationSLCTCRMP). The pull-down

limit can be modified, if desired, to any rate from 0.2 to 2° F

(0.1 to 1° C) per minute.

TIMED OVERRIDE IN EFFECT (MD06) — Timed over-

ride is in effect. This is a 1 to 4 hour temporary override of the

programmed schedule, forcing unit to Occupied mode. Over-

ride can be implemented with unit under Local (Enable) or

CCN (Carrier Comfort Network^®) control. Override expires af-

ter each use.

SLOW CHANGE OVERRIDE (MD09) — Slow change

override is in effect. The supply fluid temperature is close to

and moving towards the control point.

MINIMUM OFF TIME ACTIVE (MD10) — Unit is being

held off by Minutes Off Time (Configuration

OPT2DELY).

Two other control methods are available for Machine On/

Off control:

OCCUPANCY SCHEDULE (CTRL=2) — The main base

board will use the operating schedules as defined under the

Time Clock mode in the scrolling marquee display. These

schedules are identical. The schedule number must be set to 1

for local schedule.

The schedule number can be set anywhere from 65 to 99

for operation under a CCN global schedule. The Enable/Off/

Remote Contact must be in the Enable or Remote Contact posi-

tion. The control mode (Operating ModesMODE) will be 1

when the switch is Off. The control mode will be 3 when the

Enable/Off/Remote Contact switch input is On and the time of

day is during an unoccupied period. Similarly, the control

mode will be 7 when the time of day is during an occupied

period.

TEMPERATURE RESET (MD14) — Temperature reset is

in effect. In this mode, unit is using temperature reset to adjust

supply fluid set point upward and is currently controlling to the

modified set point. The set point can be modified based on re-

turn fluid, outdoor-air-temperature, space temperature, or 4 to

20 mA signal.

CCN SCHEDULE (CTRL=3) — An external CCN device

controls the On/Off state of the machine. This CCN device

forces the variable 'CHIL_S_S' between Start/Stop to control

the unit. The control mode (Operating ModesMODE) will

be 1 when the switch is Off. The control mode will be 2 when

the Enable/Off/Remote Contact switch input is On and the

DEMAND LIMITED (MD15) — Demand limit is in effect.

This indicates that the capacity of the unit is being limited by

CHIL_S_S variable is 'Stop.' Similarly, the control mode will

be 6 when the CHIL_S_S variable is 'Start.'

be set to the temperature difference where the maximum reset

should occur. The variable RM.DG should be set to the

maximum amount of reset desired. To verify that reset is func-

tioning correctly proceed to Run Status mode, sub-mode

VIEW, and subtract the active set point (SETP) from the con-

trol point (CTPT) to determine the degrees reset. Under normal

operation, the unit will maintain a constant leaving temperature

approximately equal to the cooling set point. As the unit load

varies, the return air temperature will change in proportion to

the load. Usually the unit size and supply air temperature set

point are selected based on a full-load condition. At part load,

the air temperature set point may be colder than required. If the

leaving air temperature was allowed to increase at part load, the

efficiency of the machine would increase.

Set Point Adjustment

CV SET POINT ADJUSTMENT — If the unit is configured

for control type SPT MULTI (C.TYP =5) and the Space Tem-

perature Offset Sensor is enabled. (SP.O.S) set to enable

[ConfigurationOPT1]. Space temperature offset corre-

sponds to a slider on a T56 sensor that allows the occupant to

adjust the space temperature by a configured range during an

occupied period. The space temperature offset range (SP.O.R)

value is either added or subtracted from the space temperature

cool set point. Example SPS.P equals 72 F and SP.O.R equals

5 then the cooling set point can be adjusted from 68 to 77 F by

adjusting the T56 slider.

Return temperature reset allows for the leaving temperature

set point to be reset upward as a function of the return air tem-

perature or, in effect, the building load.

Figures 31 and 32 are examples of outdoor air and space

temperature reset.

ITEM

EXPANSION

RANGE

UNITS

CCN POINT

Space Temp

Offset Sensor

Enable/

Disable

SP.O.S

SPTOSENS

Space Temp

Offset Range

SP.O.R

1-10

SPTO_RNG

17.8

16.7

15.6

14.4

13.3

12.2

11.1

VAV SUPPLY AIR TEMPERATURE RESET — The con-

trol system is capable of changing the controlling set point

based on several different methods. The methods are return

temperature, space temperature (SPT), outside air temperature

(OAT) and from an externally powered 4 to 20 mA signal. Re-

turn air is a measure of the building load. The return tempera-

ture reset is in effect an average building load reset method. An

accessory sensor must be used for SPT reset; either a T55, T56,

or T59 sensor can be used. The energy management module

(EMM) must be used for temperature reset using a 4 to 20 mA

signal. To use 4 to 20 mA reset, one variable must be config-

ured MA.DG, which is the amount of reset desired with a

20 mA signal. The control will interpolate between 0 degrees

reset at 4 mA and the value entered for MA.DG at 20 mA. See

Table 10 for an example of 4 to 20 mA reset.

CHANGE IN

RESET TEMPERATURE

CHANGE

IN SAT

SET POINT

MAXIMUM RESET

CHILLED SET POINT

RESET SET POINT

50 55 60 65 70 75

85 90

OUTSIDE TEMPERATURE (F)

4.4 7.2 10.0 12.8 15.6 18.3 21.1 23.9 26.7 29.4 32.2

OUTSIDE TEMPERATURE (C)

LEGEND

SAT — Supply Air Temperature

CAUTION

Care should be taken when interfacing with other control

systems due to possible power supply differences; full

wave bridge versus half wave rectification. Connection of

control devices with different power supplies may result in

permanent equipment damage. ComfortLink™ controls

incorporate power supplies with half wave rectification. A

signal isolation device should be utilized if the signal gen-

erator incorporates a full wave bridge rectifier.

Fig. 31 — Outdoor-Air Temperature Reset

17.8

16.7

15.6

14.4

13.3

12.2

11.1

CHANGE IN

RESET TEMPERATURE

CHANGE

IN SAT

SET POINT

MAXIMUM RESET

To use Outdoor Air or Space Temperature reset, four vari-

ables must be configured. In the Configuration mode under the

sub-mode RSET, items CRST, RM.NO, RM.F and RT.DG

must be properly set. See Table 11. The outdoor air reset exam-

ple provides 0° F (0° C) reset to the active set point at 85 F

(29.4 C) outdoor-air temperature and 6 F (3.3 C) reset at 55 F

(12.8 C) outdoor-air temperature. See Fig 31. The space tem-

perature reset example provides 0° F (0° C) reset to the active

set point at 72 F (22.2 C) space temperature and 6 F (3.3 C) re-

set at 68 F (20.0 C) space temperature. See Fig 32. The variable

CRST should be configured for the type of reset desired. The

variable RM.NO should be set to the temperature that no reset

should occur. The variable RM.F should be set to the tempera-

ture that maximum reset is to occur. The variable RM.DG

should be set to the maximum amount of reset desired.

CHILLED SET POINT

RESET SET POINT

66 67 68 69 70 71

SPACE TEMPERATURE (F)

73 74

18.3 18.9 19.4 20.0 20.6 21.1 21.7 22.2 22.8 23.3

SPACE TEMPERATURE (C)

LEGEND

SAT — Supply Air Temperature

Fig. 32 — Space Temperature Reset

To use Return reset, four variables must be configured. In

the Configuration mode under the sub-mode RSET, items

CRST, RT.NO, RT.F and RT.DG must be properly set. See

Table 12.

This example provides 5 F (2.8 C) active set point reset at

2 F (1.1 C) T and 0° F (0° C) reset at 10 F (5.6 C) T. The

variable RT.NO should be set to the air temperature difference

(T) where no reset should occur. The variable RT.F should

Table 10 — 4 to 20 mA Reset

KEYPAD

ENTRY

ITEM

DISPLAY

SUB-MODE

RSET

ITEM

COMMENT

EXPANSION

0 = no reset

1 = 4 to 20 mA Input

2 = Outdoor Air Temp

3 = Return Fluid

COOLING RESET

ENTER

CRST

TYPE

4 = Space Temperature

5.0 F

Default: 0° F (0° C) Reset at 20 mA

Range: –30 to 30 F (–16.7 to 16.7 C)

MA.DG

4-20 mA DEGREES RESET

(2.8 C)

NOTE: The example above shows how to configure the unit for 4 to

20 mA reset. No reset will occur at 4.0 mA input, and a 5.0 F reset

will occur at 20.0 mA. An energy management module is required.

Table 11 — Configuring Outdoor Air and Space Temperature Reset

DISPLAY

MODE

(RED LED)

KEYPAD

ENTRY

SUB-

MODE

KEYPAD

ENTRY

ITEM

EXPANSION

ITEM

COMMENT

Outdoor

Space

Air

ENTER

DISP

UNIT

OPT1

OPT2

M.MST

2 = Outdoor-Air Temperature

4 = Space Temperature

(Connect to LTV-21,22)

ENTER

COOLING RESET

TYPE

CONFIGURATION

RSET

CRST

RM.NO*

RM.F

Default: 125.0 F (51.7 C)

Range: 0° to125 F

(-17.7 to 51.7 C)

REMOTE - NO

RESET TEMP

85 °F

55 °F

15 °F

72 °F

68 °F

6 °F

Default: 0.0° F (-17.7 C)

Range: 0° to 125 F

(-17.7 to 51.7 C)

REMOTE - FULL

RESET TEMP

Default: 0° F (0° C)

Range: –30 to 30 F

(–34.4 to -1.1 °C)

REMOTE - DEGREES

RESET

RM.DG

*1 item skipped in this example.

Table 12 — Configuring Return Temperature Reset

MODE

(RED LED)

KEYPAD

ENTRY

KEYPAD

ENTRY

ITEM

EXPANSION

SUB-MODE

DISP

ITEM DISPLAY

COMMENT

ENTER

UNIT

CNN

OPT1

OPT2

M.MST

CONFIGURATION

0 = No Reset

1 = 4 to 20 mA Input (EMM required)

2 = Outdoor-Air Temperature

3 = Return Air Temperature

4 = Space Temperature

COOLING

RESET TYPE

ENTER

RSET

CRST*

RETURN - NO

RESET TEMP

Default: 10° F (5.6° C)

RT.NO*

RT.F

10° F

0° F

5° F

Range: 0° to 30 F T (-17.7 to 16.7 C)

RETURN - FULL

RESET TEMP

Default: 0° F (–17.8° C)

Range: 0° to 10 F T (-17.7 to –12.2 C)

RETURN - DEGREES Default: 0° F (0° C)

RESET Range: –30 to 30°F (–16.7 to 16.7 C)

RT.DG

*4 items skipped in this example.

from exceeding the capacity entered as Demand Limit Switch

2 set point. The demand limit stage that is set to the lowest

demand takes priority if both demand limit inputs are closed. If

the demand limit percentage does not match unit staging, the

unit will limit capacity to the closest capacity stage.

To disable demand limit, configure the DMDC to 0. See

Table 13.

EXTERNALLY POWERED DEMAND LIMIT (4 to

20 mA Controlled) — To configure Demand Limit for 4 to

20 mA control, set the Demand Limit Select (Configura-

tionRSETDMDC) to 2. Then configure the Demand

Limit at 20 mA (ConfigurationRSETDM20) to the

maximum loadshed value desired. Connect the output from an

externally powered 4 to 20 mA signal to terminal block LVT

strip terminals 7 and 8. Refer to the unit wiring diagram for

these connections to the optional/accessory energy manage-

ment module and terminal block. The control will reduce al-

lowable capacity to this level for the 20 mA signal. See Table

13 and Fig. 33.

Demand Limit — Demand Limit is a feature that allows

the unit capacity to be limited during periods of peak energy

usage. There are 3 types of demand limiting that can be

configured. The first type is through 2-stage switch control,

which will reduce the maximum capacity to 2 user-configu-

rable percentages. The second type is by 4 to 20 mA signal in-

put which will reduce the maximum capacity linearly between

100% at a 4 mA input signal (no reduction) down to the user-

configurable level at a 20 mA input signal. The third type uses

the CCN loadshed module and has the ability to limit the cur-

rent operating capacity to maximum and further reduce the ca-

pacity if required.

NOTE: The 2-stage switch control and 4 to 20 mA input signal

types of demand limiting require the energy management

module (EMM).

To use Demand Limit, select the type of demand limiting to

use. Then configure the Demand Limit set points based on the

type selected.

DEMAND LIMIT (2-Stage Switch Controlled) — To con-

figure Demand Limit for 2-stage switch control, set the Demand

Limit Select (ConfigurationRSETDMDC) to 1. Then

CAUTION

configure the

Demand Limit Switch points

Care should be taken when interfacing with other manufac-

turer’s control systems, due to possible power supply dif-

ferences, full wave bridge versus half wave rectification.

The two different power supplies cannot be mixed. Com-

fortLink™ controls use half wave rectification. A signal

isolation device should be utilized if a full wave bridge

signal generating device is used. Failure to comply could

result in possible equipment damage.

(ConfigurationRSETDLS1 and DLS2) to the desired ca-

pacity limit. See Table 13. Capacity steps are controlled by 2 re-

lay switch inputs field wired to low voltage terminal (LVT) strip

terminal 3-6. Refer to the unit wiring diagram for these connec-

tions.

For Demand Limit by 2-stage switch control, closing the

first stage demand limit contact will put the unit on the first de-

mand limit level. The unit will not exceed the percentage of ca-

pacity entered as Demand Limit Switch 1 set point. Closing

contacts on the second demand limit switch prevents the unit

Table 13 — Configuring Demand Limit

KEYPAD

ENTRY

KEYPAD

ENTRY

MODE

SUB-MODE

DISP

ITEM

DISPLAY

ITEM EXPANSION

COMMENT

CONFIGURATION

ENTER

UNIT

CCN

OPT1

OPT2

M.MST

RSET

ENTER

CRST

Cooling Reset Type

Demand Limit Select

Default: 0

0 = None

DMDC*

1 = Switch

2 = 4 to 20 mA Input

3 = CCN Loadshed

Default: 100%

DM20

SHNM

SHDL

SHTM

DLS1

DLS2

XXX %

XXX

Demand Limit at 20 mA

Loadshed Group Number

Loadshed Demand Delta

Maximum Loadshed Time

Demand Limit Switch 1

Demand Limit Switch 2

Range: 0 to 100

Default: 0

Range: 0 to 99

Default: 0%

Range: 0 to 60%

XXX%

XXX MIN

XXX %

Default: 60 min.

Range: 0 to 120 min.

Default: 80%

Range: 0 to 100%

Default: 50%

Range: 0 to 100%

*Seven items skipped in this example.

100

50% CAPACITY AT 20 mA

DM20 = 50

100% CAPACITY AT 4mA

75% CAPACITY AT 12 mA

50% CAPACITY AT 12 mA

DM20 = 0

DEMAND LIMIT SIGNAL – 4 - 20 mA INPUT

Fig. 33 — 4 to 20 mA Demand Limiting — Demand Limit Select (DMDC = 2)

DEMAND LIMIT (CCN Loadshed Controlled) — To con-

figure Demand Limit for CCN Loadshed control, set the De-

mand Limit Select (ConfigurationRSETDMDC) to 3.

Then configure the Loadshed Group Number (Configura-

tionRSETSHNM), Loadshed Demand Delta (Configu-

rationRSETSHDL), and Maximum Loadshed Time

(ConfigurationRSETSHTM). See Table 13.

The Loadshed Group number is established by the CCN

system designer. The ComfortLink controls will respond to a

Redline command from the Loadshed control. When the Red-

line command is received, the current stage of capacity is set to

the maximum stages available. Should the loadshed control

send a Loadshed command, the ComfortLink controls will re-

duce the current stages by the value entered for Loadshed De-

mand delta. The maximum loadshed time is the maximum

length of time that a loadshed condition is allowed to exist. The

control will disable the Redline/Loadshed command if no Can-

cel command has been received within the configured maxi-

mum loadshed time limit.

compressor is always installed in the A1 compressor location.

When a digital compressor is installed, a digital unloader sole-

noid (DUS) is used on the digital compressor.

DIGITAL SCROLL OPERATION — A digital scroll oper-

ates in two stages - the "loaded state" when the solenoid valve

is normally closed and the "unloaded state" when the solenoid

valve is open. During the loaded state, the compressor operates

like a standard scroll and delivers full capacity and mass flow.

However, during the unloaded state, there is no capacity

and no mass flow through the compressor. The capacity of the

system is varied by varying the time the compressor operates

in an unloaded and loaded state during a 15-second period. If

the DUS is energized for 7.5 seconds, the compressor will be

operating at 50% capacity. If the DUS is energized for 11 sec-

onds, the compressor will be operating at approximately 25%

of its capacity. Capacity is the time averaged summation of

loaded and unloaded states, and its range is continuous from

10% to 100%. Regardless of capacity, the compressor always

rotates with constant speed. As the compressor transitions from

a loaded to unloaded state, the discharge and suction pressures

will fluctuate and the compressor sound will change.

The ComfortLink controller controls and integrates the op-

eration of the DUS into the compressor staging routine to

maintain temperature control. When a digital compressor is in-

stalled, an additional discharge gas thermistor (DTT) is in-

stalled along with the AUX board for control of the DUS.

DIGITAL COMPRESSOR CONFIGURATION — When a

digital compressor is installed, the configuration parameter

ConfigurationUnitA1.TY is configured to YES. There is

also a maximum unload time configuration, Configuration

UnitMAX.T, that is set to 7 seconds, which indicates the

maximum unloading for the digital compressor is 50%. This is

done to optimize efficiency of the system.

Cooling Set Point (4 to 20 mA) — A field supplied

and generated, externally powered 4 to 20 mA signal can be

used to provide the leaving temperature set point. The energy

management module (EMM) must be used for cooling set

point control using a 4 to 20 mA signal. To use the 4 to 20 mA

set point, the unit type must be configured for control type VAV

set point (ConfigurationOPT2C.TYP = 9). Once config-

ured, the control will translate the input linearly with 4 mA

equal to 40 F set point and 20 mA equal to 80 F set point. Con-

nect the signal to LVT strip terminal 10,8 (+,-). See Table 14

for instructions to enable the function. Figure 34 shows how

the 4 to 20 mA signal is linearly calculated.

Digital Scroll Option — The 38AP units have

factory-installed option for a digital scroll compressor which

provides additional stages of unloading for the unit. The digital

Table 14 — Configuration VAV 4 to 20 mA Set Point

MODE

KEYPAD

ENTRY

KEYPAD

ENTRY

SUB-MODE

DISP

ITEM

DISPLAY

ITEM EXPANSION

COMMENT

(RED LED)

CONFIGURATION

ENTER

UNIT

CCN

OPT1

ENTER

OPT2

C.TYP

Unit Options 2 Controls

Machine Control Type

1 = VAV

3 = Tstat Multi

4 = Tstat 2 Stage

5 = SPT Multi

7 = PCT CAP

8 = Dual Stat

9 = VAV Set Point

32.2 90

26.7 80

21.1 70

15.6 60

10.0 50

4.4 40

-1.1 30

-6.7 20

-12.2 10

-17.8

SETPOINT SIGNAL – 4-20 mA INPUT

Fig. 34 — 4 to 20 mA Supply Set Point

With the unit in deep vacuum (500 microns or less), isolate

the vacuum pump from the system. Observe the rate-of-rise of

the vacuum in the system. If the vacuum rises by more than

50 microns in a 30-minute time period, then continue the dehy-

dration process. Maintain a vacuum on the system until the

standing vacuum requirement is met. This will ensure a dry

system.

PRE-START-UP

IMPORTANT: Before beginning Pre-Start-Up or Start-Up,

review Start-Up Checklist at the back of this publication.

The checklist assures proper start-up of a unit and provides

a record of unit condition, application requirements, system

information, and operation at initial start-up.

By following these evacuation and dehydration procedures,

the amount of moisture present in the system will be mini-

mized. It is required that liquid line filter driers be installed

between the condenser(s) and the expansion devices to capture

any foreign debris and provide additional moisture removal

capacity.

Do not attempt to start the air-conditioning system until the

following checks have been completed.

System Check

1. Check all system components, including the air-handling

equipment. Consult manufacturer's instructions. If the

unit has field-installed accessories, be sure all are proper-

ly installed and wired correctly. Refer to unit wiring

diagrams.

2. Open liquid line and suction line service valves.

3. Check tightness of all electrical connections.

4. Oil should be visible in the compressor sight glasses. An

acceptable oil level in the compressor is from ¹/₈to ³/₈of

sight glass. Adjust the oil level as required. No oil should

be removed unless the crankcase heater has been ener-

gized for at least 24 hours. See Add Oil section on

page 47, for Carrier-approved oils.

5. Electrical power source must agree with unit nameplate.

6. Crankcase heaters must be firmly attached to compres-

sors, and must be on for 24 hours prior to start-up.

7. Fan motors are 3-phase. Check rotation of fans during

first start-up check.

START-UP

IMPORTANT: Before beginning Pre-Start-Up or Start-Up,

review Start-Up Checklist at the back of this publication.

The checklist assures proper start-up of a unit and provides

a record of unit condition, application requirements, system

information, and operation at initial start-up.

CAUTION

Crankcase heaters on all units are wired into the control cir-

cuit, so they are always operable as long as the main power

supply disconnect is on (closed), even if any safety device

is open. Compressor heaters must be on for 24 hours prior

to the start-up of any compressor. Equipment damage

could result if heaters are not energized for at least 24 hours

prior to compressor start-up.

EVACUATION AND DEHYDRATION — Because the

38AP systems use polyolester (POE) oil, which can absorb

moisture, it is important to minimize the amount of time that

the system interior is left exposed to the atmosphere. Minimiz-

ing the exposure time of the oil to the atmosphere will mini-

mize the amount of moisture that needs to be removed during

evacuation.

Once all of the piping connections are complete, leak test

the unit and then pull a deep dehydration vacuum. Connect the

vacuum pump to the charging valve in the suction line and to

the liquid line service valve. For best results, it is recommended

that a vacuum of at least 500 microns (0.5 mm Hg) be ob-

tained. Afterwards, to ensure that no moisture is present in the

system, perform a standing vacuum-rise test.

Compressor crankcase heaters must be on for 24 hours be-

fore start-up. To energize the crankcase heaters, close the field

disconnect and turn on the fan circuit breakers. Leave the com-

pressor circuit breakers off/open. The crankcase heaters are

now energized.

Preliminary Charge — Refer to GTAC II (General

Training Air Conditioning), Module 5, Charging, Recovery,

Recycling, and Reclamation for charging procedures. Using

the liquid charging method and charging by weight procedure,

charge each circuit with the amount of Puron^®refrigerant

(R-410A) listed in Table 15.

Table 15 — Preliminary Puron Refrigerant (R-410A)

Charge, lb (kg)

CAUTION

38AP UNIT SIZE

38APS025

38APD025

38APS027

38APD027

38APS030

38APD030

38APS040

38APD040

38APS050

38APD050

38APD060

38APD070

38APD080

38APD090

38APD100

CIRCUIT A

24 (10.9)

12 (5.6)

CIRCUIT B

—

Charging procedures for MCHX (microchannel heat

exchanger) units require very accurate measurement tech-

niques. Charge should be added in small increments. Using

cooling charging charts provided, add or remove refriger-

ant until conditions of the chart are met. As conditions get

close to the point on the chart, add or remove charge in

¹/₄lb increments until complete. Ensure that all fans are on

and all compressors are running when using charging

charts. Failure to comply may result in equipment damage.

12 (5.6)

—

26 (11.6)

13 (6.0)

—

29 (12.9)

14 (6.5)

—

39 (17.7)

21 (9.5)

17 (7.8)

—

48 (21.5)

22 (9.9)

26 (11.6)

29 (12.9)

33 (15.1)

46 (20.7)

Due to the compact design of microchannel heat exchang-

ers, refrigerant charge is reduced significantly. As a result,

charging procedures for MCHX units require very accurate

measurement techniques. Charge should be added in small

increments. Using cooling charging charts provided, add or

remove refrigerant until conditions of the chart are met. As

conditions get close to the point on the chart, add or remove

charge in ¹/₄lb increments until complete. Ensure that all fans

are on and all compressors are running when using charging

charts. If charging at low outdoor ambient, the condenser coil

can be partially blocked in order to increase head pressure.

With all fans operating and all compressors on the circuit

being serviced operating at full capacity, adjust the refrigerant

charge in accordance with the unit charging charts in Fig. 35-

56. Charge vapor into compressor low-side service port located

on the suction service valve. Measure pressure at the liquid line

service valve, making sure a Schrader depressor is used. Also,

measure liquid line temperature as close to the liquid service

valve as possible. Add charge until the pressure and tempera-

ture conditions of the charging chart curve are met. If liquid

pressure and temperature point fall above curve, add charge. If

liquid pressure and temperature point fall below curve, reduce

the charge until the conditions match the curve.

27 (12.1)

29 (12.9)

39 (17.7)

46 (20.7)

NOTES:

1. Preliminary charge is based on 25 ft (7.6 m) of interconnecting liquid line

piping between indoor and outdoor units.

2. For liquid line piping longer than 25 ft (7.6 m), use the following

information:

¹/₂in. (12.7 mm) liquid line — 0.6 lb per 10 linear ft (0.27 kg per 3 m)

⁵/₈in. (15.9 mm) liquid line — 1.0 lb per 10 linear ft (0.45 kg per 3 m)

⁷/₈in. (22.2 mm) liquid line — 2.0 lb per 10 linear ft (0.91 kg per 3 m)

1¹/₈in. (28.6 mm) liquid line — 3.5 lb per 10 linear ft (1.59 kg per 3 m)

Adjust Refrigerant Charge

CAUTION

Never charge liquid into the low pressure side of system.

Do not overcharge. During charging or removal of refriger-

ation, be sure indoor fan system is operating. Failure

to comply could result in personal injury or equipment

damage.

If the sight glass is cloudy, check refrigerant charge again.

See Fig. 57 and 58. Ensure all fans and compressors on the cir-

cuit being serviced are operating. Also ensure maximum allow-

able liquid lift has not been exceeded. If the sight glass is

cloudy, a restriction could exist in the liquid line. Check for a

plugged filter drier or partially open solenoid valve. Replace or

repair, as needed.

Circuit A or B

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7169

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 35 — Charging Chart — 38APD025, 50/60 Hz

Single Circuit

130

50 SST

40 SST

120

110

100

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7170

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

Saturated Suction Temperature

4000

2000

2500

3000

3500

LEGEND

SST

—

LIQUID PRESSURE AT LIQUID VALVE (kPag)

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 36 — Charging Chart — 38APS025, 50/60 Hz

Circuit A or B

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7171

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 37 — Charging Chart — 38APD027, 50/60 Hz

Single Circuit

130

50 SST

40 SST

120

110

100

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7172

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

SST

—

LIQUID PRESSURE AT LIQUID VALVE (kPag)

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 38 — Charging Chart — 38APS027, 50/60 Hz

Circuit A or B

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

a38-7173

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 39 — Charging Chart — 38APD030, 50/60 Hz

Single Circuit

130

50 SST

40 SST

30 SST

120

110

100

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7174

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 40 — Charging Chart — 38APS030, 50/60 Hz

Circuit A

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

a38-7175

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 41 — Charging Chart — 38APD040 — Circuit A, 50/60 Hz

Circuit B

130

50 SST

40 SST

30 SST

120

110

100

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

a38-7176

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 42 — Charging Chart — 38APD040 — Circuit B, 50/60 Hz

Single Circuit

130.0

120.0

110.0

100.0

90.0

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

80.0

70.0

a38-7177

60.0

200.0

250.0

300.0

350.0

400.0

450.0

500.0

550.0

600.0

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

LEGEND

Saturated Suction Temperature

2000

2500

3000

3500

SST

—

LIQUID PRESSURE AT LIQUID VALVE (kPag)

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 43 — Charging Chart — 38APS040, 50/60 Hz

Circuit A

130

50 SST

40 SST

30 SST

120

110

100

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7178

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

LEGEND

Saturated Suction Temperature

1500

4000

2000

2500

3000

3500

SST

—

LIQUID PRESSURE AT LIQUID VALVE (kPag)

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 44 — Charging Chart — 38APD050 — Circuit A, 50/60 Hz

Circuit B

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

a38-7179

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

SST

—

LIQUID PRESSURE AT LIQUID VALVE (kPag)

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 45 — Charging Chart — 38APD050 — Circuit B, 50/60 Hz

Single Circuit

130

50 SST

40 SST

30 SST

120

110

100

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7180

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 46 — Charging Chart — 38APS050, 50/60 Hz

Circuit A

130.0

120.0

110.0

100.0

90.0

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

80.0

70.0

60.0

200.0

250.0

300.0

350.0

400.0

450.0

500.0

550.0

600.0

a38-7181

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

LEGEND

Saturated Suction Temperature

2000

2500

3000

3500

SST

—

LIQUID PRESSURE AT LIQUID VALVE (kPag)

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 47 — Charging Chart — 38APD060 — Circuit A, 50/60 Hz

Circuit B

130.0

50 SST

40 SST

120.0

110.0

100.0

90.0

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

80.0

70.0

60.0

200.0

250.0

300.0

350.0

400.0

450.0

500.0

550.0

600.0

a38-7182

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

LEGEND

Saturated Suction Temperature

1500

4000

2000

2500

3000

3500

SST

—

LIQUID PRESSURE AT LIQUID VALVE (kPag)

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 48 — Charging Chart — 38APD060 — Circuit B, 50/60 Hz

Circuit A

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

a38-7183

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 49 — Charging Chart — 38APD070 — Circuit A, 50/60 Hz

Circuit B

130

50 SST

40 SST

120

110

100

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7184

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

Saturated Suction Temperature

4000

2000

2500

3000

3500

LEGEND

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 50 — Charging Chart — 38APD070 — Circuit B, 50/60 Hz

Circuit A

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7185

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 51 — Charging Chart — 38APD080 — Circuit A, 50/60 Hz

Circuit B

130

50 SST

40 SST

30 SST

120

110

100

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7186

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 52 — Charging Chart — 38APD080 — Circuit B, 50/60 Hz

Circuit A

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

a38-7187

1500

4000

2000

2500

3000

3500

LEGEND

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

Saturated Suction Temperature

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 53 — Charging Chart — 38APD090 — Circuit A, 50/60 Hz

Circuit B

130

50 SST

40 SST

30 SST

120

110

100

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7188

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 54 — Charging Chart — 38APD090 — Circuit B, 50/60 Hz

Circuit A

130

120

110

100

50 SST

40 SST

30 SST

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

a38-7189

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 55 — Charging Chart — 38APD100 — Circuit A, 50/60 Hz

Circuit B

130

50 SST

40 SST

30 SST

120

110

100

ADD CHARGE IF ABOVE CURVE

REDUCE CHARGE IF BELOW CURVE

200

250

300

350

400

450

500

550

600

a38-7190

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

1500

4000

2000

2500

3000

3500

LEGEND

Saturated Suction Temperature

LIQUID PRESSURE AT LIQUID VALVE (kPag)

SST

—

NOTE: Charging procedures for MCHX units require very accurate measurement techniques. Charge should be added in small increments. Using cooling

charging charts provided, add or remove refrigerant until conditions of the chart are met. As conditions get close to the point on the chart, add or remove charge in

1/4 lb increments until complete. Ensure that all fans are on and all compressors are running when using charging charts.

Fig. 56 — Charging Chart — 38APD100 — Circuit B, 50/60 Hz

a38-7117

†

LEGEND

LLS — Liquid Line Solenoid

TXV — Thermostatic Expansion Valve

*Field-supplied.

†Field-supplied when required. Must be controlled by 38AP unit control.

Fig. 57 — Required Location of Solenoid Valves and Recommended Filter Drier and

Sight Glass Locations for 38APD025-100 Dual-Circuit Units

a38-7118

SECTION 1

LIQUID

LINE

SECTION 2

SOLENOID VALVE†

SECTION 1

LIQUID

LINE

SECTION 2

SOLENOID VALVE†

*Field-supplied.

†Field-supplied when required. Must be controlled by 38AP unit control.

Fig. 58 — Required Location of Solenoid Valves and Recommended Filter Drier and

Sight Glass Locations for 38APS025-050 Single-Circuit Units

SUCTION

SCHRADER B

RGT B SPT B

Check Compressor Oil Level — After adjusting the

refrigerant charge, allow each circuit to run fully loaded for

20 minutes. Stop the compressors and check the oil level. Oil

level should be ¹/₈to ³/₈up on the sight glass.

SPT A

RGT A

SUCTION

SCHRADER A

IMPORTANT: Oil level should only be checked when the

compressors are off.

Add oil only if necessary to bring the oil into view in the

sight glass. If oil is added, run the circuit for an additional

10 minutes, then stop and check oil level. If the level remains

low, check the piping system for proper design for oil return;

also, check the system for leaks. If checking the oil level with

unit running in part load, let unit run one hour, then run at full

load for 10 minutes. If oil does not return to acceptable sight

glass levels, check for correct suction piping and line sizing.

HPS A

DPT A

HPS B

DPT B

DTT A

Final Checks — Ensure all safety controls are operating,

control panel covers are on, and the service panels are in place.

Oil Charge

CAUTION

OIL SIGHT

GLASS

LEGEND

The compressor in a Puron^®refigerant (R-410A) system

uses a polyol ester (POE) oil. This is extremely hygro-

scopic, meaning it absorbs water readily. POE oils can

absorb 15 times as much water as other oils designed for

HCFC and CFC refrigerants. Take all necessary precau-

tions to avoid exposure of the oil to the atmosphere. Failure

to do so could result in possible equipment damage.

DPT

DTT

HPS

RGT

SPT

—

Discharge Pressure Transducer

Discharge Temperature Thermistor

High Pressure Switch

Return Gas Temperature Sensor

Space Temperature Sensor

Fig. 59 — Typical Tandem Compressor Assembly

RGT A

SPT A

Puron systems use a polyol ester (POE) oil. Use only Carri-

er approved compressor oil. Oil should be visible in compres-

sor oil sight glass. An acceptable oil level is from ¹/₈to ³/₈of

sight glass. All compressors must be off when checking oil lev-

el. Recommended oil level adjustment method is as follows:

SUCTION

SCHRADER A

ADD OIL — Recover charge from the outdoor section of the

unit and isolate the condensing unit using the liquid and suction

service valves. Add oil to suction line Schrader valve on tan-

dem compressors sets and the compressor Schrader on the trio

and single compressor circuits. (See Fig. 59 and 60.) When oil

can be seen at the bottom of the sight glass, add oil in 5 oz in-

crements which is approximately ¹/₈in oil level. Run all com-

pressors for 20 minutes then shut off to check oil level. Repeat

procedure until acceptable oil level is present.

HPS A

DPT A

DTT A

OIL ADD

LOCATION

NOTE: Use only Carrier approved compressor oil. Approved

sources are:

Totaline . . . . . . . . . . . . . . . . . . . . . . .3MAF POE P903-1601

Mobil. . . . . . . . . . . . . . . . . . . . . . . . . . .EAL Arctic 32-3MA

Uniqema . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RL32-3MAF

OIL SIGHT

GLASS

Do not reuse oil that has been drained out, or oil that has

been exposed to atmosphere.

Actual Start-Up

NOTE: Refer to Start-Up Checklist on pages CL-1 to CL-5.

Actual start-up should be done only under supervision of a

qualified refrigeration mechanic.

LEGEND

DPT

DTT

HPS

RGT

SPT

—

Discharge Pressure Transducer

Discharge Temperature Thermistor

High Pressure Switch

Return Gas Temperature Sensor

Space Temperature Sensor

VAV APPLICATIONS — C.TYP = 1 and 9

1. Start indoor fan motor.

Fig. 60 — Typical Trio Compressor Assembly

2. Fan status switch input should close. Note the unit will

not start unless the Fan Status input is closed.

3. Unit C.TYP = 1: Using the scrolling marquee display,

set leaving set point (Set PointCOOLCSP.1). Unit

C.TYP = 9: Using the 4 to 20mA input, set the control

point (Run StatusVIEWCTPT) for leaving set

point.

4. Turn ENABLE/OFF/REMOTE CONTACT switch to

ENABLE position.

5. If supply air temperature is greater than the control point

the unit will start to stage up.

CV APPLICATION — C.TYP = 4

1. Start indoor fan motor.

2. Fan status switch input should close. Note the unit will

not start unless the fan status input is closed.

3. Close Y1 input unit will stage up to 50 % capacity with

1 minute between stages.

4. Close Y2 input the unit will stage up to 100% capacity

with 1 minute between stages.

CV APPLICATION — C.TYP = 3

The maximum voltage deviation is the largest difference

between a voltage measurement across 2 legs and the average

across all 3 legs.

Example: Supply voltage is 240-3-60.

AB = 243 v

BC = 236 v

AC = 238 v

1. Start indoor fan motor.

2. Fan status switch input should close. Note the unit will

not start unless the fan status input is closed.

1. Determine average voltage:

3. Close Y1 input unit. The control will control supply-air

243 + 236 + 238

Averagevoltage =

temperature to CSP1 and stage capacity as required.

4. Close Y2 input. The unit will control supply-air tempera-

717

ture to CSP2 and stage capacity as required.

CV APPLICATION — C.TYP = 5

= 239

1. Start indoor fan motor.

2. Determine maximum deviation from average voltage:

2. Fan status switch input should close. Note the unit will

not start unless the fan status input is closed.

3. The control will use space temperature (Temperatures

SPT) vs space temperature set point (Set Point

COOLSPS.P) to decide to whether to control supply-

air temperature to CSP1 or CSP2, and will stage capacity

as required.

(AB) 243 – 239 = 4 v

(BC) 239 – 236 = 3 v

(AC) 239 – 238 = 1 v

Maximum deviation is 4 v.

3. Determine percent voltage imbalance:

% Voltage Imbalance = 100 x

239

% CAPACITY INPUT — C.TYP = 7

1. Start indoor fan motor.

2. Fan status switch input should close. Note the unit will

not start unless the fan status input is closed.

= 1.7%

This voltage imbalance is satisfactory as it is below the

maximum allowable of 2%.

3. The control will adjust unit capacity based on the 4 to

20mA Cool mA (INPUTS4-20CL.MA).

4. Actual capacity and desired capacity may be different due

to unit diagnostics.

IMPORTANT: If the supply voltage phase imbalance is

more than 2%, contact your local electric utility company

immediately. Do not operate unit until imbalance condition

is corrected.

OPERATION

Operating Limitations

AMBIENT LMITATIONS — See Table 16 for ambient

limitations.

Control Circuit Power — Power for the control circuit is

supplied from the main incoming power through a factory-

installed control power transformer (TRAN1) for all models.

Field wiring connections are made to LVT terminal board.

Table 16 — 38AP Unit Ambient Limitations

Single Circuit

Operation Sequence — During unit off cycle, if power

is maintained to the unit and the EMERGENCY ON/OFF

switch is left in the OFF position, the compressor crankcase

heaters will be energized.

38APS

UNIT

SIZE

MINIMUM LOW

AMBIENT

(Standard Unit)

MINIMUM LOW AMBIENT

MOTORMASTER^®

CONTROL*

MAXIMUM

AMBIENT†

The unit is started by putting the ENABLE/OFF/REMOTE

CONTACT switch in the ENABLE or REMOTE CONTACT

position. When the unit receives a call to run (either from the

internal control, or CCN network command or remote contact

closure), the unit stages up in capacity to maintain either supply

air temperature or space temperature. The first compressor

starts 1¹/₂to 3 minutes after the call for cooling.

The lead circuit can be specifically designated on all models

or selected based on compressor run hours and starts depend-

ing on field configuration. The unit control will override this

selection under certain starting conditions to properly maintain

oil return to the compressors. The MBB controls fan stages to

maintain the head pressure set point and will automatically ad-

just unit capacity as required to keep compressors from operat-

ing outside of the specified envelope. There are no pumpout or

pumpdown sequences on these units.

025-050

45 F (7.2 C)

–20 F (–28.9 C)

122 F (50 C)

Dual Circuit

38APD

UNIT

SIZE

025-040

050-060

070-100

MINIMUM LOW

AMBIENT

(Standard Unit)

32 F (0 C)

25 F (–3.9 C)

32 F (0 C)

MINIMUM LOW AMBIENT

MOTORMASTER

CONTROL*

MAXIMUM

AMBIENT†

–20 F (–28.9 C)

–20 F(–28.9 C)

122 F (50 C)

* Factory-installed option or field-installed accessory.

†Operation above listed temperature depends on the saturated suction tem-

perature the unit is operating at. Refer to ECAT for exact limitations.

VOLTAGE (ALL UNITS)

Main Power Supply — Minimum and maximum acceptable

supply voltages are listed in the Installation Instructions.

Unbalanced 3-Phase Supply Voltage — Never operate a motor

where a phase imbalance between phases is greater than 2%.

To determine percent voltage imbalance:

The liquid line solenoid valve is energized anytime a com-

pressor is operating in the circuit and also when the circuit is

OFF and the OAT is less than the SST. The liquid line solenoid

valve is de-energized 5 seconds after the circuit stops and also

when the circuit is OFF and the OAT is greater than the SST

plus 2° F. Each circuit operates independently.

max voltage deviation

from avg voltage

% Voltage Imbalance = 100 x

average voltage

For all units, if temperature reset is used, the unit controls to

a higher leaving temperature as the building load reduces. If

demand limit is used, the unit may temporarily be unable to

maintain the desired leaving-air temperature because of im-

posed power limitations. Loading sequence for compressors is

shown in Table 8.

(SPT), supply air temperature (SAT) and return air temperature

(RAT/EAT) thermistors.

SPACE TEMPERATURE THERMISTOR (SPT) — This

sensor is a field-supplied accessory and is part of the T55 or

T56 sensor package that can be used to control space tempera-

ture on constant volume (CV) units. The sensor is connected to

the LVT. The SPT has a 10 k input channel and has a differ-

ent set of temperature vs. resistance and voltage drop perfor-

mance than the 5 k thermistors.

SERVICE

WARNING

SUPPLY AIR THERMISTOR (SAT) — This sensor is field

supplied and is used to measure the supply air temperature of

the unit. The SAT thermistor is configurable to be either a 5 k

or 10 k thermistor. Care should be taken to ensure the config-

uration matches the type of thermistor which is installed. This

is configured under the Configuration menu OPT1, SAT.T and

by selecting 0 for 5 k or 1 for 10 k or 2 for none. The proper

temperature vs. resistance and voltage drop performance tables

should be followed based on the configuration.

ELECTRIC SHOCK HAZARD: Turn off all power to unit

before servicing. The ENABLE/OFF/REMOTE CON-

TACT switch on control panel does not shut off control

power; use field disconnect. Failure to do so could result in

personal injury.

Electronic Components

RETURN AIR OR EVAPORATOR AIR THERMISTOR

(RAT) — This sensor is field supplied and should be located

directly upstream of the evaporator. The RAT is used to mea-

sure the evaporator entering or return air temperature of the

unit. The RAT thermistor is configurable to be either a 5 k

or 10 k thermistor. Care should be taken to ensure the

configuration matches the type of thermistor which is installed.

This is configured under the Configuration menu OPT1,

RAT.T and by selecting 0 for 5 k or 1 for 10 k or 2 for none.

The proper temperature vs. resistance and voltage drop perfor-

mance tables should be followed based on configuration.

CONTROL COMPONENTS — Unit uses an advanced elec-

tronic control system that normally does not require service.

For details on controls refer to Operating Data section.

Access to the compressors is through latched panels from

beneath the control box on the unit sizes 025-060 and on each

end of the unit on sizes 070-100. The front door(s) provide

access to the compressor(s) and all components of the

refrigeration system. For unit sizes 025-030, access to the

controls is through the upper latched outer door above the com-

pressor access door. Similarly, the upper center latched door on

sizes 040-060 gives access to the controls. Inner panels are se-

cured in place and should not be removed unless all power to

the unit is off.

See Table 3 for thermistor pin connection points.

THERMISTOR/TEMPERATURE SENSOR CHECK — A

high quality digital volt-ohmmeter is required to perform this

check.

1. Connect the digital voltmeter across the appropriate the-

mistor terminals at the J8 terminal strip on the main base

board (see Fig. 61).

Thermistors — Electronic control uses up to 7 thermistors

to sense temperatures used to control operation of the unit. The

standard unit comes with return gas temperature (RGT) and

outside air temperature (OAT) thermistors. These thermistors

are 5 k thermistors, identical in their temperature and voltage

drop performance. Resistance at various temperatures is listed

in Tables 17-21.

2. Using the voltage reading obtained, read the sensor tem-

perature from Tables 17-21.

3. To check thermistor accuracy, measure temperature at

probe location with an accurate thermocouple-type tem-

perature measuring instrument. Insulate thermocouple to

avoid ambient temperatures from influencing reading.

Temperature measured by thermocouple and temperature

determined from thermistor voltage reading should be

close, ± 5° F (3° C) if care was taken in applying thermo-

couple and taking readings.

DISCHARGE

TEMPERATURE

THERMISTOR

(DTT) — This sensor is only used on units with a digital

compressor. The sensor is mounted on the discharge line close

to the discharge of the digital compressor. It attaches to the dis-

charge line using a spring clip and protects the system from

high discharge gas temperature when the digital compressor is

used. This sensor is a 86 k thermistor connected to the AUX

board.

If a more accurate check is required, unit must be shut down

and thermistor removed and checked at a known temperature

(freezing point or boiling point of water) using either voltage

drop measured across thermistor at the J8 terminal, by deter-

mining the resistance with unit shut down and thermistor

disconnected from J8. Compare the values determined with the

value read by the control in the Temperatures mode using the

scrolling marquee display.

RETURN GAS THERMISTORS (RGTA,B) — The

RGTA,B thermistors are located in the suction line of the re-

spective circuits and are used to monitor superheat entering the

compressor and generate low superheat alarms.

OUTSIDE AIR THERMISTOR (OAT) — The OAT is lo-

cated inside the base rail on unit sizes 025-060 and on the back

of the control box on sizes 070-100. It is used to control fan cy-

cling on the unit.

REPLACING

RETURN

GAS

THERMISTORS

The remaining thermistors are installed in either the space,

ductwork or air handler. These include the space temperature

(RGTA,B) — Add a small amount of thermal conductive

grease to the thermistor well and end of probe. Tighten the re-

taining nut ¹/₄turn past finger tight.

Table 17 — 5K Thermistor Temperatures (°F) vs. Resistance/Voltage Drop

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

1.982

1.956

1.930

1.905

1.879

1.854

1.829

1.804

1.779

1.754

1.729

1.705

1.681

1.656

1.632

1.609

1.585

1.562

1.538

1.516

1.493

1.470

1.448

1.426

1.404

1.382

1.361

1.340

1.319

1.298

1.278

1.257

1.237

1.217

1.198

1.179

1.160

1.141

1.122

1.104

1.086

1.068

1.051

1.033

1.016

0.999

0.983

0.966

0.950

0.934

0.918

0.903

0.888

0.873

0.858

0.843

0.829

0.815

0.801

0.787

0.774

0.761

0.748

0.735

0.723

0.710

0.698

0.686

0.674

0.663

0.651

0.640

0.629

0.618

0.608

0.597

0.587

0.577

0.567

0.557

0.548

0.538

0.529

0.520

7,686

7,665

7,468

7,277

7,091

6,911

6,735

6,564

6,399

6,238

6,081

5,929

5,781

5,637

5,497

5,361

5,229

5,101

4,976

4,855

4,737

4,622

4,511

4,403

4,298

4,196

4,096

4,000

3,906

3,814

3,726

3,640

3,556

3,474

3,395

3,318

3,243

3,170

3,099

3,031

2,964

2,898

2,835

2,773

2,713

2,655

2,597

2,542

2,488

2,436

2,385

2,335

2,286

2,239

2,192

2,147

2,103

2,060

2,018

1,977

1,937

1,898

1,860

1,822

1,786

1,750

1,715

1,680

1,647

1,614

1,582

1,550

1,519

1,489

1,459

1,430

1,401

1,373

1,345

1,318

1,291

1,265

1,240

1,214

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

0.511

0.502

0.494

0.485

0.477

0.469

0.461

0.453

0.445

0.438

0.430

0.423

0.416

0.408

0.402

0.395

0.388

0.381

0.375

0.369

0.362

0.356

0.350

0.344

0.339

0.333

0.327

0.322

0.317

0.311

0.306

0.301

0.296

0.291

0.286

0.282

0.277

0.272

0.268

0.264

0.259

0.255

0.251

0.247

0.243

0.239

0.235

0.231

0.228

0.224

0.220

0.217

0.213

0.210

0.206

0.203

0.200

0.197

0.194

0.191

0.188

0.185

0.182

0.179

0.176

0.173

0.171

0.168

0.165

0.163

0.160

0.158

0.155

0.153

0.151

0.148

0.146

0.144

0.142

0.140

0.138

0.135

0.133

1,190

1,165

1,141

1,118

1,095

1,072

1,050

1,029

1,007

986

965

945

925

906

887

868

850

832

815

798

782

765

750

734

719

705

690

677

663

650

638

626

614

602

591

581

570

561

551

542

533

524

516

508

501

494

487

480

473

467

461

456

450

445

439

434

429

424

419

415

410

405

401

396

391

386

382

377

372

367

361

356

350

344

338

332

325

318

311

304

297

289

282

–25

–24

–23

–22

–21

–20

–19

–18

–17

–16

–15

–14

–13

–12

–11

–10

–9

–8

–7

–6

–5

–4

–3

–2

–1

3.699

3.689

3.679

3.668

3.658

3.647

3.636

3.624

3.613

3.601

3.588

3.576

3.563

3.550

3.536

3.523

3.509

3.494

3.480

3.465

3.450

3.434

3.418

3.402

3.386

3.369

3.352

3.335

3.317

3.299

3.281

3.262

3.243

3.224

3.205

3.185

3.165

3.145

3.124

3.103

3.082

3.060

3.038

3.016

2.994

2.972

2.949

2.926

2.903

2.879

2.856

2.832

2.808

2.784

2.759

2.735

2.710

2.685

2.660

2.634

2.609

2.583

2.558

2.532

2.506

2.480

2.454

2.428

2.402

2.376

2.349

2.323

2.296

2.270

2.244

2.217

2.191

2.165

2.138

2.112

2.086

2.060

2.034

2.008

98,010

94,707

91,522

88,449

85,486

82,627

79,871

77,212

74,648

72,175

69,790

67,490

65,272

63,133

61,070

59,081

57,162

55,311

53,526

51,804

50,143

48,541

46,996

45,505

44,066

42,679

41,339

40,047

38,800

37,596

36,435

35,313

34,231

33,185

32,176

31,202

30,260

29,351

28,473

27,624

26,804

26,011

25,245

24,505

23,789

23,096

22,427

21,779

21,153

20,547

19,960

19,393

18,843

18,311

17,796

17,297

16,814

16,346

15,892

15,453

15,027

14,614

14,214

13,826

13,449

13,084

12,730

12,387

12,053

11,730

11,416

11,112

10,816

10,529

10,250

9,979

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

9,717

9,461

9,213

8,973

8,739

8,511

8,291

8,076

Table 18 — 5K Thermistor Temperatures (°C) vs. Resistance/Voltage Drop

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

TEMP

(C)

RESISTANCE

(Ohms)

TEMP

(C)

RESISTANCE

(Ohms)

TEMP

(C)

RESISTANCE

(Ohms)

1.982

1.935

1.889

1.844

1.799

1.754

1.710

1.666

1.623

1.580

1.538

1.497

1.457

1.417

1.378

1.340

1.302

1.265

1.229

1.194

1.160

1.126

1.093

1.061

1.030

0.999

0.969

0.940

0.912

0.885

0.858

0.832

0.807

0.782

0.758

0.735

0.713

0.691

0.669

0.649

0.629

0.610

0.591

0.573

0.555

0.538

0.522

7,855

7,499

7,161

6,840

6,536

6,246

5,971

5,710

5,461

5,225

5,000

4,786

4,583

4,389

4,204

4,028

3,861

3,701

3,549

3,404

3,266

3,134

3,008

2,888

2,773

2,663

2,559

2,459

2,363

2,272

2,184

2,101

2,021

1,944

1,871

1,801

1,734

1,670

1,609

1,550

1,493

1,439

1,387

1,337

1,290

1,244

1,200

100

101

102

103

104

105

106

107

0.506

0.490

0.475

0.461

0.447

0.433

0.420

0.407

0.395

0.383

0.371

0.360

0.349

0.339

0.329

0.319

0.309

0.300

0.291

0.283

0.274

0.266

0.258

0.251

0.244

0.237

0.230

0.223

0.217

0.211

0.204

0.199

0.193

0.188

0.182

0.177

0.172

0.168

0.163

0.158

0.154

0.150

0.146

0.142

0.138

0.134

1,158

1,118

1,079

1,041

1,006

971

938

906

876

836

805

775

747

719

693

669

645

623

602

583

564

547

531

516

502

489

477

466

456

446

436

427

419

410

402

393

385

376

367

357

346

335

324

312

299

285

–32

3.705

3.687

3.668

3.649

3.629

3.608

3.586

3.563

3.539

3.514

3.489

3.462

3.434

3.406

3.376

3.345

3.313

3.281

3.247

3.212

3.177

3.140

3.103

3.065

3.025

2.985

2.945

2.903

2.860

2.817

2.774

2.730

2.685

2.639

2.593

2.547

2.500

2.454

2.407

2.360

2.312

2.265

2.217

2.170

2.123

2.076

2.029

100,260

94,165

88,480

83,170

78,125

73,580

69,250

65,205

61,420

57,875

54,555

51,450

48,536

45,807

43,247

40,845

38,592

38,476

34,489

32,621

30,866

29,216

27,633

26,202

24,827

23,532

22,313

21,163

20,079

19,058

18,094

17,184

16,325

15,515

14,749

14,026

13,342

12,696

12,085

11,506

10,959

10,441

9,949

–31

–30

–29

–28

–27

–26

–25

–24

–23

–22

–21

–20

–19

–18

–17

–16

–15

–14

–13

–12

–11

–10

–9

–8

–7

–6

–5

–4

–3

–2

–1

9,485

9,044

8,627

8,231

Table 19 — 10K Thermistor Temperature (°F) vs. Resistance/Voltage Drop

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(F)

RESISTANCE

(Ohms)

–25

–24

–23

–22

–21

–20

–19

–18

–17

–16

–15

–14

–13

–12

–11

–10

–9

–8

–7

–6

–5

–4

–3

–2

–1

4.758

4.750

4.741

4.733

4.724

4.715

4.705

4.696

4.686

4.676

4.665

4.655

4.644

4.633

4.621

4.609

4.597

4.585

4.572

4.560

4.546

4.533

4.519

4.505

4.490

4.476

4.461

4.445

4.429

4.413

4.397

4.380

4.363

4.346

4.328

4.310

4.292

4.273

4.254

4.235

4.215

4.195

4.174

4.153

4.132

4.111

4.089

4.067

4.044

4.021

3.998

3.975

3.951

3.927

3.903

3.878

3.853

3.828

3.802

3.776

3.750

3.723

3.697

3.670

3.654

3.615

3.587

3.559

3.531

3.503

3.474

3.445

3.416

3.387

3.357

3.328

3.298

3.268

3.238

3.208

3.178

3.147

3.117

3.086

3.056

3.025

196,453

189,692

183,300

177,000

171,079

165,238

159,717

154,344

149,194

144,250

139,443

134,891

130,402

126,183

122,018

118,076

114,236

110,549

107,006

103,558

100,287

97,060

94,020

91,019

88,171

85,396

82,729

80,162

77,662

75,286

72,940

70,727

68,542

66,465

64,439

62,491

60,612

58,781

57,039

55,319

53,693

52,086

50,557

49,065

47,627

46,240

44,888

43,598

42,324

41,118

39,926

38,790

37,681

36,610

35,577

34,569

33,606

32,654

31,752

30,860

30,009

29,177

28,373

27,597

26,838

26,113

25,396

24,715

24,042

23,399

22,770

22,161

21,573

20,998

20,447

19,903

19,386

18,874

18,384

17,904

17,441

16,991

16,552

16,131

15,714

15,317

2.994

2.963

2.932

2.901

2.870

2.839

2.808

2.777

2.746

2.715

2.684

2.653

2.622

2.592

2.561

2.530

2.500

2.470

2.439

2.409

2.379

2.349

2.319

2.290

2.260

2.231

2.202

2.173

2.144

2.115

2.087

2.059

2.030

2.003

1.975

1.948

1.921

1.894

1.867

1.841

1.815

1.789

1.763

1.738

1.713

1.688

1.663

1.639

1.615

1.591

1.567

1.544

1.521

1.498

1.475

1.453

1.431

1.409

1.387

1.366

1.345

1.324

1.304

1.284

1.264

1.244

1.225

1.206

1.187

1.168

1.150

1.132

1.114

1.096

1.079

1.062

1.045

1.028

1.012

0.996

0.980

0.965

0.949

0.934

0.919

0.905

14,925

14,549

14,180

13,824

13,478

13,139

12,814

12,493

12,187

11,884

11,593

11,308

11,031

10,764

10,501

10,249

10,000

9,762

9,526

9,300

9,078

8,862

8,653

8,448

8,251

8,056

7,869

7,685

7,507

7,333

7,165

6,999

6,838

6,683

6,530

6,383

6,238

6,098

5,961

5,827

5,698

5,571

5,449

5,327

5,210

5,095

4,984

4,876

4,769

4,666

4,564

4,467

4,370

4,277

4,185

4,096

4,008

3,923

3,840

3,759

3,681

3,603

3,529

3,455

3,383

3,313

3,244

3,178

3,112

3,049

2,986

2,926

2,866

2,809

2,752

2,697

2,643

2,590

2,539

2,488

2,439

2,391

2,343

2,297

2,253

2,209

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

0.890

0.876

0.862

0.848

0.835

0.821

0.808

0.795

0.782

0.770

0.758

0.745

0.733

0.722

0.710

0.699

0.687

0.676

0.666

0.655

0.645

0.634

0.624

0.614

0.604

0.595

0.585

0.576

0.567

0.558

0.549

0.540

0.532

0.523

0.515

0.507

0.499

0.491

0.483

0.476

0.468

0.461

0.454

0.447

0.440

0.433

0.426

0.419

0.413

0.407

0.400

0.394

0.388

0.382

0.376

0.370

0.365

0.359

0.354

0.349

0.343

0.338

0.333

0.328

0.323

0.318

0.314

0.309

0.305

0.300

0.296

0.292

0.288

0.284

0.279

0.275

0.272

0.268

0.264

2,166

2,124

2,083

2,043

2,003

1,966

1,928

1,891

1,855

1,820

1,786

1,752

1,719

1,687

1,656

1,625

1,594

1,565

1,536

1,508

1,480

1,453

1,426

1,400

1,375

1,350

1,326

1,302

1,278

1,255

1,233

1,211

1,190

1,169

1,148

1,128

1,108

1,089

1,070

1,052

1,033

1,016

998

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

981

964

947

931

915

900

885

870

855

841

827

814

800

787

774

762

749

737

725

714

702

691

680

670

659

649

639

629

620

610

601

592

583

574

566

557

Table 20 — 10K Thermistor Temperature (°C) vs. Resistance/Voltage Drop

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

VOLTAGE

DROP

(V)

TEMP

(C)

RESISTANCE

(Ohms)

TEMP

(C)

RESISTANCE

(Ohms)

TEMP

(C)

RESISTANCE

(Ohms)

–32

–31

–30

–29

–28

–27

–26

–25

–24

–23

–22

–21

–20

–19

–18

–17

–16

–15

–14

–13

–12

–11

–10

–9

4.762

4.748

4.733

4.716

4.700

4.682

4.663

4.644

4.624

4.602

4.580

4.557

4.533

4.508

4.482

4.455

4.426

4.397

4.367

4.335

4.303

4.269

4.235

4.199

4.162

4.124

4.085

4.044

4.003

3.961

3.917

3.873

3.828

3.781

3.734

3.686

3.637

3.587

3.537

3.485

3.433

3.381

3.328

3.274

3.220

3.165

3.111

200,510

188,340

177,000

166,342

156,404

147,134

138,482

130,402

122,807

115,710

109,075

102,868

97,060

91,588

86,463

81,662

77,162

72,940

68,957

65,219

61,711

58,415

55,319

52,392

49,640

47,052

44,617

42,324

40,153

38,109

36,182

34,367

32,654

31,030

29,498

28,052

26,686

25,396

24,171

23,013

21,918

20,883

19,903

18,972

18,090

17,255

16,464

3.056

3.000

2.944

2.889

2.833

2.777

2.721

2.666

2.610

2.555

2.500

2.445

2.391

2.337

2.284

2.231

2.178

2.127

2.075

2.025

1.975

1.926

1.878

1.830

1.784

1.738

1.692

1.648

1.605

1.562

1.521

1.480

1.439

1.400

1.362

1.324

1.288

1.252

1.217

1.183

1.150

1.117

1.086

1.055

1.025

0.996

0.968

15,714

15,000

14,323

13,681

13,071

12,493

11,942

11,418

10,921

10,449

10,000

9,571

9,164

8,776

8,407

8,056

7,720

7,401

7,096

6,806

6,530

6,266

6,014

5,774

5,546

5,327

5,117

4,918

4,727

4,544

4,370

4,203

4,042

3,889

3,743

3,603

3,469

3,340

3,217

3,099

2,986

2,878

2,774

2,675

2,579

2,488

2,400

100

101

102

103

104

105

106

107

0.940

0.913

0.887

0.862

0.837

0.813

0.790

0.767

0.745

0.724

0.703

0.683

0.663

0.645

0.626

0.608

0.591

0.574

0.558

0.542

0.527

0.512

0.497

0.483

0.470

0.457

0.444

0.431

0.419

0.408

0.396

0.386

0.375

0.365

0.355

0.345

0.336

0.327

0.318

0.310

0.302

0.294

0.287

0.279

0.272

0.265

2,315

2,235

2,157

2,083

2,011

1,943

1,876

1,813

1,752

1,693

1,637

1,582

1,530

1,480

1,431

1,385

1,340

1,297

1,255

1,215

1,177

1,140

1,104

1,070

1,037

1,005

974

–8

–7

–6

–5

944

–4

915

–3

889

–2

861

–1

836

811

787

764

742

721

700

680

661

643

626

609

592

576

561

Table 21 — 86K Thermistor vs Resistance (DTT)

TEMP

(C)

TEMP

(F)

RESISTANCE

(Ohms)

TEMP

(C)

TEMP

(F)

RESISTANCE

(Ohms)

-40

-31

-22

-13

-4

2,889,600

2,087,220

1,522,200

1,121,440

834,720

627,280

475,740

363,990

280,820

218,410

171,170

135,140

107,440

86,000

167

176

185

194

203

212

221

230

239

248

257

266

275

284

293

302

311

320

329

338

347

356

12,730

10,790

9,200

7,870

6,770

5,850

5,090

4,450

3,870

3,350

2,920

2,580

2,280

2,020

1,800

1,590

1,390

1,250

1,120

1,010

920

-35

-30

-25

-20

-15

-10

-5

100

105

110

115

120

125

130

135

140

145

150

155

160

165

170

175

180

69,280

56,160

104

113

122

131

140

158

45,810

37,580

30,990

25,680

21,400

15,070

830

Pressure Transducers — The suction and discharge

transducers are different part numbers and can be distinguished

by the color of the transducer body, suction (yellow) and dis-

charge (red). Figures 59 and 60 shows typical location of pres-

sure transducers on each circuit. No pressure transducer cali-

bration is required. The transducers operate on a 5 vdc supply,

which is generated by the main base board (MBB). See Fig. 61

for transducer connections to the J8 connector on the MBB.

fan height.eps in

job folder (WIP)

RGTA

RED

BLK

RED

Fig. 62 — Mounted Fan Position

RGTB

LVT

T55

BLK

BLU

RED

J12

IMPORTANT: Check for proper fan rotation (clockwise

when viewed from above). If necessary, switch any

2 power leads to reverse fan rotation.

T-55

ACCSY

SEN

OAT

SPACE TEMPERATURE

ACCESSORY OR

DUAL CHILLER LWT

LOW SOUND FAN — A shroud and a wire guard provide

protection from the rotating fan. The exposed end of the fan

motor shaft is protected from weather by grease. If fan motor

must be removed for service or replacement, be sure to re-

grease fan shaft and reinstall fan guard. The fan motor has a

step in the motor shaft. For proper performance, fan should be

positioned such that it is securely seated on this step. Tighten

the bolt to 15 ± 1 ft-lb (20 ± 1.3 N·m).

BLK

EVAPORATOR ENTERING

FLUID TEMP

RED

BLK

RED

EVAPORATOR LEAVING

FLUID TEMP

BLK

RED

IMPORTANT: Check for proper fan rotation (counter-

clockwise when viewed from above). If necessary, switch

any 2 power leads to reverse fan rotation.

DPTB

SPTB

DPTA

GRN

BLK

RED

transducer.eps

in job folder (WIP)

Motormaster^®V Controller — The optional or acces-

sory Motormaster V controller uses an input signal from the

AUX board. See Fig. 63. The controller is factory configured

and requires no field programming. If a situation arises where

the drive does not function properly, the information provided

below and in Table 22 can be used to troubleshoot the drive.

GRN

BLK

RED

GRN

BLK

RED

SPTA

GRN

BLK

WARNING

LEGEND

Hazard of electrical shock! Wait three minutes after discon-

necting incoming power before servicing drive. Capacitors

retain charge after power is removed. Drive assembly

includes externally mounted current limiting resistors. Use

extreme caution when servicing the drive. Failure to com-

ply could result in possible personal injury.

ACCSY

DPT

LVT

—

Accessory

Discharge Pressure Transducer

Low Voltage Terminal

LWT

OAT

Leaving Fluid Temperature

Outdoor Air Temperature Sensor

Return Gas Temperature Sensor

Sensor Terminal Block

RGT

SEN

SPT

Space Temperature Sensor

WARNING

Fig. 61 — Thermistor Connections to

Main Base Board, J8 Connector

When configured as shown below, this equipment is

designed to start when it receives line power. Ensure that

all personnel are clear of fans and guards are installed

before applying power. Failure to comply could result in

possible personal injury.

TROUBLESHOOTING — If a transducer is suspected of be-

ing faulty, first check supply voltage to the transducer. Supply

voltage should be 5 vdc ± 0.2 v. If supply voltage is correct,

compare pressure reading displayed on the scrolling marquee

display module against pressure shown on a calibrated pressure

gauge. Pressure readings should be within ± 15 psig. If the

two readings are not reasonably close, replace the pressure

transducer.

CAUTION

If input power has not been applied to the drive for a period

of time exceeding three years (due to storage, etc.), the

electrolytic DC bus capacitors within the drive can change

internally, resulting in excessive leakage current. This can

result in premature failure of the capacitors if the drive is

operated after such a long period of inactivity or storage. In

order to reform the capacitors and prepare the drive for

operation after a long period of inactivity, apply input

power to the drive for 8 hours prior to actually operating

the motor. Before attempting to operate the drive, motor,

and driven equipment, be sure all procedures pertaining to

installation and wiring have been properly followed. Fail-

ure to comply could result in equipment damage.

Condenser Fans — Each fan is supported by a formed

wire mount bolted to a fan deck and covered with a wire guard.

METAL FANS — The exposed end of fan motor shaft is pro-

tected from weather by grease and a rubber boot. If fan motor

must be removed for service or replacement, be sure to re-

grease fan shaft and reinstall fan guard. For proper perfor-

mance, fan web should be 0.32 in. (8 mm) below top of orifice

on the fan deck to top of the fan hub. (See Fig. 62.) Tighten set

screws to 15 ± 1 ft-lb (20 ± 1.3 N-m). Figure 62 shows the

proper position of mounted fan.

5. Press Mode to display present parameter number.

CAUTION

Upper right decimal point blinks.

Use the

and

buttons to scroll to the desired

DO NOT connect incoming AC power to output terminals

T1, T2, and T3! Severe damage to the drive will result. Do

not continuously cycle input power to the drive more than

once every two minutes. Damage to the drive will result.

parameter number.

Once the desired parameter number is found, press the

Mode button to display the present parameter setting. The up-

per right-hand decimal point will begin blinking, indicating

that the present parameter setting is being displayed, and that it

can be changed by using the up and down buttons. Use

GENERAL OPERATION — The speed varies in proportion

to a 4 to 20 mA signal produced by the ComfortLink™ con-

trols. The MMV output speed is displayed in Hz.

and

to change setting. Press Mode to store new setting.

The ComfortLink controls must be configured for MMV

operation in order for it to operate. This is configured under the

Configuration menu M.MASTMMR.S and selecting

“YES”. This configuration menu also contains the gains and

minimum speed for the motormaster control logic.

CONFIGURATION — The MMV is configured for 1 of 12

operation modes based on the inputs to the control terminal

block. The 38AP units use operating modes 5-8. In these con-

figurations, the MMV follows a 4 to 20 mA speed reference

signal present on terminals 25 (+) and 2 (-). One additional

jumper is required to configure the drive for 50/60 Hz opera-

tion and input voltage. See Table 23 for proper inputs. Once the

drive is powered, it will change to the mode selected according

to the inputs. See Fig. 64.

Pressing the Mode will store the new setting and also exit

the PROGRAM mode. To change another parameter, press the

Mode key again to re-enter the PROGRAM mode (the param-

eter menu will be accessed at the parameter that was last

viewed or changed before exiting). If the Mode key is pressed

within two minutes of exiting the PROGRAM mode, the pass-

word is not required to access the parameters. After two min-

utes, the password must be entered in order to access the pa-

rameters again.

To change password: first enter the current password then

change parameter P44 to the desired password.

To disable automatic control mode and enter manual speed

control mode:

1. Change P05 to ‘01- keypad’.

2. Push UP and DOWN arrow key to set manual speed.

DRIVE PROGRAMMING

3. Set P05 to ‘04 - 4-20mA control’ to restore 4 to 20 mA

control.

CAUTION

EPM CHIP — The drive uses a electronic programming mod-

ule (EPM) chip to store the program parameters. This is an

EEPROM memory chip and is accessible from the front of the

VFD. It should not be removed with power applied to the

VFD.

LOSS OF CCN COMMUNICATIONS — Carrier Comfort

Network^®(CCN) communications with external control

systems can be affected by high frequency electrical noise gen-

erated by the Motormaster V control. Ensure unit is well

grounded to eliminate ground currents along communication

lines.

If communications are lost only while Motormaster V con-

trol is in operation, order a signal isolator (CEAS420876-2)

and power supplies (CEAS221045-01, 2 required) for the CCN

communication line.

Fault Codes — The drive is programmed to automatically re-

start after a fault and will attempt to restart three times after a

fault (the drive will not restart after CF, cF, GF, F1, F2-F9, or

Fo faults). If all three restart attempts are unsuccessful, the

drive will trip into FAULT LOCKOUT (LC), which requires a

manual reset.

It is strongly recommended that the user NOT change any

programming without consulting Carrier service personnel.

Unit damage may occur from improper programming.

To enter password and change program values:

1. Press Mode.

2. Upper right decimal point blinks.

3. Display reads “00”. To enter the PROGRAM mode to ac-

cess the parameters, press the Mode button. This will ac-

tivate the PASSWORD prompt (if the password has not

been disabled). The display will read “00” and the upper

right-hand decimal point will be blinking. (See Fig. 63.)

4. Use the

and

buttons to scroll to the password

value (the factory default password is “111”) and press

the Mode button. Once the correct password value is

entered, the display will read “P01”, which indicates that

the PROGRAM mode has been accessed at the beginning

of the parameter menu (P01 is the first parameter).

NOTE: If the display flashes “Er”, the password was incorrect,

and the process to enter the password must be repeated.

Mode

DANGER

LEGEND

MMV

— Motormaster V Control

MMV

TERMINAL

BLOCK

B+

B-

DISPLAY

BUTTONS

Mode

Fig. 63 — Motormaster^®V Mode Buttons and Mode Display

Table 22 — Fault Codes

FAULT CODE

DESCRIPTION

SOLUTION

High Temperature Fault: Ambient temperature is too high; Cooling

fan has failed (if equipped).

Check cooling fan operation

Control Fault: A blank EPM, or an EPM with corrupted data has

been installed.

Perform a factory reset using Parameter 48 —

PROGRAM SELECTION.

Incompatibility Fault: An EPM with an incompatible parameter ver-

sion has been installed.

Either remove the EPM or perform a factory reset

(Parameter 48) to change the parameter version of

the EPM to match the parameter version of the drive.

CURRENT LIMIT: The output current has exceeded the CURRENT Check for loose electrical connections.

LIMIT setting (Parameter 25) and the drive is reducing the output

Check for faulty condenser fan motor.

frequency to reduce the output current. If the drive remains in CUR- Check Parameter P25 from Table 23 is set correctly.

RENT LIMIT too long, it can trip into a CURRENT OVERLOAD fault

(PF).

Data Fault: User data and OEM defaults in the EPM are corrupted. Restore factory defaults P48, see section above. If

that does not work, replace EPM.

High DC Bus Voltage Fault: Line voltage is too high; Deceleration

rate is too fast; Overhauling load.

Check line voltage — set P01 appropriately

Serial Fault: The watchdog timer has timed out, indicating that the

serial link has been lost.

Check serial connection (computer)

Check settings for PXX.

Check settings in communication software to match

PXX.

Low DC Bus Voltage Fault: Line voltage is too low.

Check line voltage — set P01 appropriately

Output Transistor Fault: Phase to phase or phase to ground short

Reduce boost or increase acceleration values. If

circuit on the output; Failed output transistor; Boost settings are too unsuccessful, replace drive.

high; Acceleration rate is too fast.

Check for incorrect wiring T1, T2, T3.

Current Overload Fault: VFD is undersized for the application;

Mechanical problem with the driven equipment.

Check line voltage — set P01 appropriately

Check for dirty coils

Check for motor bearing failure

Single-phase Fault: Single-phase input power has been applied to a Check input power phasing

three-phase drive.

EPM Fault: The EPM is missing or damaged.

F2-F9, Fo

Internal Faults: The control board has sensed a problem

Feedback signal is above set point

Consult factory

Drive display = 60.0 even though it is

cold outside and it should be running

slower

Check for proper set point

Check liquid line pressure

Drive display = ‘---’ even though drive

should be running

Start jumper is missing

Replace start jumper. See section above

Drive display = 8.0 even though fan

should be running faster

Feedback signal is below set point and fan is at minimum speed

Check for proper set point

Check liquid line pressure

VFD flashes 57 and LCS

Feedback or speed signal lost. Drive will operate at 57 Hz until reset In stand alone mode: Check transducer wiring and

or loss of start command. Resetting requires cycling start command feedback voltage. Feedback voltage displayed on

(or power).

P-69. Pin 6 should be 5 v output. Pin 5 (feedback)

should be somewhere between 0 and 5 v.

MOTORMASTER V TERMINAL BLOCK

13A

13B

13C

FR1

208/230, 460, 575 VOLT ONLY

208 VOLT ONLY

FR1

T ONL

400 V

LEGEND

Configuration Table

AUX — Auxiliary

CONTROL INPUT

(PINS 25, 2)

— Fuse Block

— Fan Relay

MODE

NOMINAL VOLTAGE

START JUMPER

MM — Motormaster

208/230/460/575*

208/380

External control 4-20 mA

TB1-TB2

TB13A-TB2

TB13B-TB2

TB13C-TB2

OFM — Outdoor Fan Motor

— Terminal Block

230

380/415

*208-v can run in mode 5 or 6.

Fig. 64 — Typical Motormaster^®Wiring

Table 23 — Motormaster^®V Program Parameters for Operating Modes

PARAMETER

P01

P02

P03

P04

P05

P06

P08

P09

P10

P11

P12

P13

P14

P15

P16

P17

P19

P20

P21

P22

P23

P24

P25

P26

P27

P28

P29

P30

P31

P32

P33

P34

P35

P36

P37

P38

P39

P40

P41

P42

P43

P44

P45

P46

P47

P48

P61

P62

P63

P64

P65

P66

P67

P68

DESCRIPTION

Line Voltage: 01 = low line, 02 = high line

Carrier Freq: 01 = 4 kHz, 02 = 6 kHz, 03=8 kHz

Start-up mode: flying restart

Stop mode: coast to stop

Standard Speed source: 04=4-20 mA, 05=R22, 06=R134a

TB-14 output: 01 = none

TB-30 output: 01 = none

MODE 5 MODE 6 MODE 7 MODE 8

TB-31 Output: 01 = none

TB-13A function sel: 01 = none

TB-13B function sel: 01 = none

TB-13C function sel: 01 = none

TB-15 output: 01 = none

Control: 01 = Terminal strip

Serial link: 02 = enabled 9600,8,N,2 with timer

Units editing: 02 = whole units

Rotation: 01 = forward only, 03 = reverse only

Acceleration time: 10 sec

Deceleration time: 10 sec

DC brake time: 0

DC BRAKE VOLTAGE 0%

Min freq = 8 Hz ~ 100 - 160 rpm

Max freq

Current limit:

Motor overload: 100

Base freq: 60 or 50 Hz

Fixed boost: 0.5% at low frequencies

Accel boost: 0%

Slip compensation: 0%

Preset spd #1: 0

Preset spd #2: 0

Preset spd #3: 0

125

100

0.5

125

100

0.5

110

100

0.5

110

100

0.5

Preset spd 4 default – R22 setpoint. TB12-2 open

Preset spd 5 default – R134a setpoint. TB12-2 closed

Preset spd 6 default

Preset spd 7 default

Skip bandwidth

18.0

12.6

18.0

12.6

18.0

12.6

18.0

12.6

Speed scaling

Frequency scaling 50 or 60 Hz

Load scaling: default (not used so NA)

Accel/decel #2: default (not used so NA)

Serial address

200

Password:111

111

Speed at min signal: 8 Hz used when PID disabled and 4-20 mA input

Speed at max feedback: 60 or 50 Hz. Used when PID disabled and 4-20 mA input

Clear history? 01 = maintain. (set to 00 to clear)

Program selection: Mode 1 – 12

PI Mode: 05= reverse, 0-5V, 01 = no PID

Min feedback = 0 (0V *10)

Max feedback = 50 (5V * 10)

Proportional gain = 4%

Integral gain = .2

PI accel/decel (setpoint change filter) = 5

Min alarm

Max alarm

LEGEND

NA — Not Applicable

PID — Proportional Integral Derivative

TB — Terminal Block

TROUBLESHOOTING — Troubleshooting the Motormas-

ter^®V control requires a combination of observing system op-

eration and VFD display information. The MMV should fol-

low the 4 to 20 mA signal from the ComfortLink™ controls.

The speed command from the ComfortLink controls can be

monitored in 2 ways:

5. Mount the new module in the unit’s control box using a

Phillips screwdriver and the screws saved in Step 2.

6. Reinstall all module connectors. For accessory Naviga-

tor™ device replacement, make sure the plug is installed

at LVT in the LEN connector.

7. Carefully check all wiring connections before restoring

power.

8. Verify the ENABLE/OFF/REMOTE CONTACT switch

is in the OFF position.

9. Restore control power. Verify that all module red LEDs

blink in unison. Verify that all green LEDs are blinking

and that the scrolling marquee or Navigator display is

communicating correctly.

10. Verify all configuration information, settings, set points

and schedules. Return the ENABLE/OFF/REMOTE

CONTACT switch to its previous position.

1. Variables VH.PA, VH.PB in the "outputs" submenu of

ComfortLink - given as a percentage of 4 to 20 mA range.

2. P56 in Motormaster V shows 4-20 mA input in percent of

maximum input.

Refer to Table 24 for the variable definitions of each

controller.

Table 24 — Controller Cross-Reference

4-20 mA

CONTROL

SIGNAL

VH.PA, VH.PB

(COMFORTLINK)

VFD SPEED

(MOTORMASTER V)

INPUT (P56,

MOTORMASTER V)

4 mA

12 mA

20 mA

50%

20%

60%

8 Hz

26 Hz

60 Hz

Table 25 — Replacement Modules

100%

REPLACEMENT PART NO.

MODULE

(with Software)

The MMV also provides real time monitoring of key in-

puts and outputs. The collective group is displayed through pa-

rameters 50-56 and all values are read only.

• P50: FAULT HISTORY — Last 8 faults

• P51: SOFTWARE version

• P52: DC BUS VOLTAGE — in percent of nominal.

Usually rated input voltage x 1.4.

• P54: LOAD — in percent of drives rated output current

rating

Main Base Board (MBB)

38AP501672

HK50AA031

Scrolling Marquee Display

Energy Management

Module (EMM)

30GT515218

Navigator Display

Compressor Expansion Board

Auxiliary Board

HK50AA033

HK50AA027

32GB500442EE

Compressors

• P55: VDC INPUT — in percent of maximum input: 50

will indicate full scale which is 5 v

• P56: 4-20 mA INPUT — in percent of maximum input:

20% = 4 mA, 100% = 20 mA

WARNING

Do not supply power to unit with compressor cover

removed. Failure to follow this warning can cause a fire,

resulting in personal injury or death.

REPLACING DEFECTIVE MODULES — The Comfort-

Link^™replacement modules are shown in Table 25. If the main

base board (MBB) has been replaced, verify that all configura-

tion data is correct. Follow the Configuration mode table and

verify that all items under sub-modes UNIT, OPT1 and OPT2

are correct. Any additional field-installed accessories or op-

tions (RSET, SLCT sub-modes) should also be verified as well

as any specific time and maintenance schedules.

Refer to the Start-Up Checklist for 38AP units (completed

at time of original start-up) found in the job folder. This infor-

mation is needed later in this procedure. If the checklist does

not exist, fill out the current information in the Configuration

mode on a new checklist. Tailor the various options and config-

urations as needed for this particular installation.

WARNING

Exercise extreme caution when reading compressor cur-

rents when high-voltage power is on. Correct any of the

problems described below before installing and running a

replacement compressor. Wear safety glasses and gloves

when handling refrigerants. Failure to follow this warning

can cause fire, resulting in personl injury or death.

CAUTION

Do not manually operate contactors. Serious damage to the

machine may result.

CAUTION

Electrical shock can cause personal injury. Disconnect all

electrical power before servicing.

COMPRESSOR REPLACEMENT — To change out

faulty compressor, refer to the compressor replacement proce-

dure included with the new compressor.

1. Check that all power to unit is off. Carefully disconnect

all wires from the defective module by unplugging its

connectors.

2. Remove the defective module by removing its mounting

screws with a Phillips screwdriver, and removing the

module from the control box. Save the screws for later

use.

3. Verify that the instance jumper (MBB) or address switch-

es (all other modules) exactly match the settings of the

defective module.

OIL CHARGE — Compressors are factory charged with

110 oz of POE oil. Refer to Oil Charge section page 47 for

proper oil and charge procedure.

MAINTENANCE

Recommended Maintenance Schedule — The fol-

lowing are only recommended guidelines. Jobsite conditions

may dictate that maintenance schedule is performed more often

than recommended.

NOTE: Handle boards by mounting standoffs only to avoid

electrostatic discharge.

4. Package the defective module in the carton of the new

module for return to Carrier.

Every month:

TROUBLESHOOTING

• Check condenser coils for debris, clean as necessary.

• Check moisture indicating sight glass for possible refrig-

erant loss and presence of moisture.

Complete Unit Stoppage and Restart — Possi-

ble causes for unit stoppage and reset methods are shown be-

low. (See Table 26 also.) Refer to Fig. 1-3 and 8-17 for compo-

nent arrangement and control wiring diagrams.

Every 3 months:

• Check refrigerant charge.

• Check all refrigerant joints and valves for refrigerant

leaks, repair as necessary.

• Check fan status switch operation.

• Check condenser coils for debris.

• Check all condenser fans for proper operation.

• Check compressor oil level.

GENERAL POWER FAILURE — After power is restored,

restart is automatic through normal MBB start-up.

UNIT ENABLE-OFF-REMOTE CONTACT SWITCH IS

OFF — When the switch is OFF, the unit will stop immediate-

ly. Place the switch in the ENABLE position for local switch

control or in the REMOTE CONTACT position for control

through remote contact closure.

FAN STATUS INPUT OPEN — After the problem causing

the fan status input to be open has been corrected, reset is auto-

matic by closing the fan status input.

OPEN 24-V CONTROL CIRCUIT BREAKER(S) — De-

termine the cause of the failure and correct. Reset circuit break-

er(s). Restart is automatic after MBB start-up cycle is

complete.

COOLING LOAD SATISFIED — Unit shuts down when

cooling load has been satisfied. Unit restarts when required to

satisfy set point.

THERMISTOR FAILURE — If a thermistor fails in either an

open or shorted condition, the unit will be shut down. Replace

SAT or RAT as required. Unit restarts automatically, but must

be reset manually by resetting the alarm with the scrolling mar-

quee as shown in Table 27.

• Check crankcase heater operation.

Every 12 months:

• Check all electrical connections, tighten as necessary.

• Inspect all contactors and relays, replace as necessary.

• Check accuracy of thermistors, replace if greater than

± 2° F (1.2° C) variance from calibrated thermometer.

• Obtain and test an oil sample. Change oil only if

necessary.

• Check refrigerant filter driers for excessive pressure

drop, replace as necessary.

• Check condition of condenser fan blades and ensure they

are securely fastened to the motor shaft.

• Perform service test to confirm operation of all

components.

Microchannel Heat Exchanger (MCHX) Con-

denser Coil Maintenance and Cleaning

Recommendations

CAUTION

If unit stoppage occurs more than once as a result of any of

the safety devices listed, determine and correct cause

before attempting another restart.

Do not apply any chemical cleaners to MCHX condenser

coils. These cleaners can accelerate corrosion and damage

the coil.

COMPRESSOR SAFETIES — The 38AP units with Com-

fortLink™ controls include a compressor protection board that

protects the operation of each of the compressors. Each board

senses the presence or absence of current to each compressor.

If there is a command for a compressor to run and there is

no current, then one of the following safeties or conditions

have turned the compressor off:

Compressor Overcurrent — All compressors have internal

line breaks or a motor protection device located in the com-

pressor electrical box.

Compressor Short Circuit — There will not be current if the

compressor circuit breaker that provides short circuit protection

has tripped.

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 steps should

be taken to clean MCHX condenser coils:

1. Remove any foreign objects or debris attached to the

coreface or trapped within the mounting frame and

brackets.

2. Put on personal protective equipment including safety-

glasses and/or face shield, waterproof clothing and

gloves. It is recommended to use full coverage clothing.

3. Start high pressure water sprayer and purge any soap or

industrial cleaners from sprayer before cleaning condens-

er coils. Only clean, potable water is authorized for clean-

ing condenser coils.

Compressor Motor Over Temperature — The internal line-

break or over temperature switch has opened.

High-Pressure Switch Trip — The high pressure switch has

opened. Below are the factory settings for the fixed high pres-

sure switch.

4. Clean condenser face by spraying the core steady and

uniformly from top to bottom while directing the spray

straight toward the core. Do not exceed 900 psig or 30 de-

gree angle. The nozzle must be at least 12 in. from the

core face. Reduce pressure and use caution to prevent

damage to air centers.

CUTOUT

CUT-IN

38AP UNIT

SIZE

psig

kPa

psig

kPa

025-100

650

4482

500

3447

ASTP Protection Trip — All non-digital Copeland compres-

sors are equipped with an advanced scroll temperature protec-

tion (ASTP). A label located above the terminal box identifies

models that contain this technology. See Fig. 65.

CAUTION

Excessive water pressure will fracture the braze between

air centers and refrigerant tubes.

Low Saturated Suction — Several conditions can lead to low

saturated suction alarms. The controls have several override

modes built in which will attempt to keep the unit from

shutting down. Low airflow, low refrigerant charge and

plugged filter driers are the main causes for this condition. To

avoid permanent damage, do NOT repeatedly reset these alert

and/or alarm conditions without identifying and correcting the

cause(s).

Alarms and Alerts — These are warnings of abnormal

or fault conditions, and may cause either one circuit or the

whole unit to shut down. They are assigned code numbers as

described in Table 26.

Automatic alarms will reset without operator intervention if

the condition corrects itself. The following method must be

used to reset manual alarms (refer to Table 27):

Before resetting any alarm, first determine the cause of the

alarm and correct it. After determining and correcting the cause

of the alarm, enter the Alarm mode indicated by the LED on

Fig. 65 — Advanced Scroll Temperature

Protection Label

Advanced scroll temperature protection is a form of internal

discharge temperature protection that unloads the scroll com-

pressor when the internal temperature reaches approximately

300 F. At this temperature, an internal bi-metal disk valve

opens and causes the scroll elements to separate, which stops

compression. Suction and discharge pressures balance while

the motor continues to run. The longer the compressor runs un-

loaded, the longer it must cool before the bi-metal disk resets.

See Fig. 66 for approximate reset times.

To manually reset ASTP, the compressor should be stopped

and allowed to cool. If the compressor is not stopped, the motor

will run until the motor protector trips, which occurs up to

90 minutes later. Advanced scroll temperature protection will

reset automatically before the motor protector resets, which

may take up to 2 hours.

the side of the scrolling marquee display. Press

and

ENTER

until the sub-menu item RCRN “RESET ALL CURRENT

ALARMS” is displayed. Press . The control will

ENTER

prompt the user for a password, by displaying PASS and

WORD. Press to display the default password, 1111.

ENTER

for each character. If the password has been

Press

ENTER

changed, use the arrow keys to change each individual charac-

ter. Toggle the display to “YES” and press

alarms will be reset.

. The

ENTER

Compressor Time Guards — For compressors, the control

will use a Compressor Minimum OFF Time of 2 minutes or a

Compressor Minimum ON Time of 3 minutes.

High Discharge Gas Temperature Protection — Units

equipped with digital compressors have an additional thermis-

tor located on the discharge line, If discharge temperature ex-

ceeds 265 F (129.4 C), the digital compressor will be shut off.

Alarms will also occur if the current sensor board malfunc-

tions or is not properly connected to its assigned digital input. If

the compressor is commanded OFF and the current sensor

reads ON, an alert is generated. This will indicate that a com-

pressor contactor has failed closed. In this case, a special mode,

Compressor Stuck on Control, will be enabled and all other

compressors will be turned off. An alarm will then be enabled

to indicate that service is required. Outdoor fans will continue

to operate. The first outdoor fan stage is turned on immediately.

The other stages of fan will be turned on as required by SCT.

DIAGNOSTIC ALERT CODES AND POSSIBLE

CAUSES

T048 (Circuit A Compressor Availability Alert)

T049 (Circuit B Compressor Availability Alert)

—

Alert

codes 048 and 049 are for circuits A and B respectively. These

alerts occur when two compressors are unavailable to run on a

3 compressor circuit. This alert can only occur on single circuit

unit sizes 040-060 and three compressor circuit unit sizes 70-

100. The control ensures proper oil return by insuring a circuit

does not operate with one compressor for longer than one hour

of cumulative run time.

COMPRESSOR FAILURE ALERTS

T051, T052, T053 (Circuit A Compresser Failures)

T055, T056, T057 (Circuit B Compressor Failures) — Alert

codes 051, 052, 053, 55, 56 and 057 are for compressors A1,

A2, A3, B1, B2, and B3 respectively. These alerts occur when

the current sensor (CS) does not detect compressor current dur-

ing compressor operation. When this occurs, the control turns

off the compressor.

120

110

100

If the current sensor board reads OFF while the compressor

relay has been commanded ON, an alert is generated.

POSSIBLE CAUSES

Compressor Overload — Either the compressor internal over-

load protector is open or the external overload protector (Kri-

wan module) has activated. The external overload protector

modules are mounted in the compressor wiring junction box.

Temperature sensors embedded in the compressor motor wind-

ings are the inputs to the module. The module is powered with

24 vac from the units main control box. The module output is a

normally closed contact that is wired in series with the com-

pressor contactor coil. In a compressor motor overload condi-

tion, contact opens, deenergizing the compressor contactor.

Low Refrigerant Charge — If the compressor operates for an

extended period of time with low refrigerant charge, the com-

pressor ASTP device will open, which will cause the compres-

sor to trip on its overload protection device.

Compressor Unloaded Run Time (Minutes)

*Times are approximate.

NOTE: Various factors, including high humidity, high ambient temperature,

and the presence of a sound blanket will increase cool-down times.

Fig. 66 — Recommended Minimum Cool Down

Time After Compressor is Stopped*

Circuit Breaker Trip — The compressors are protected from

short circuit by a breaker in the control box.

Wiring Error — A wiring error might not allow the compres-

sor to start.

control, the supply-air temperature must be updated every

3 minutes. If it is not updated, then the alarm will be generated.

Failure of this thermistor will shut down the entire unit.

To check out alerts T051-T057:

A061 (Return Air Thermistor Failure) — If the unit is re-

quired to use the return air thermistor input (C.TYP 1, 3, 5, and

9) and the sensor reading is outside the range of –40 to 245 F

(–40 to118 C) then the alarm will occur. The cause of the alarm

is usually a faulty thermistor, a shorted or open thermistor

caused by a wiring error, or a loose connection. If the return

temperature is being written to by CCN or a third party control,

the return-air temperature must be updated every 3 minutes. If

it is not updated, then the alarm will be generated. Failure of

this thermistor will shut down the entire unit.

T068, T69 (Circuit A,B Compressor Return Gas Tempera-

ture Thermistor Failure) — This alert occurs when the com-

pressor return gas temperature sensor is outside the range of

–40 to 245 F (–40 to 118 C). Failure of this thermistor will dis-

able any elements of the control which requires its use.

T073 (Outside Air Temperature Thermistor Failure) — This

alert occurs when the outside air temperature sensor is outside

the range of –40 to 245 F (–40 to 118 C). Failure of this therm-

istor will disable any elements of the control which requires its

use.

T074 (Space Temperature Thermistor Failure) — This alert

occurs when the space temperature sensor is outside the range

of –40 to 245 F (–40 to 118 C). Failure of this thermistor will

disable any elements of the control which requires its use. If the

unit is configured for SPT 2 stage or SPT multi-stage operation

and the sensor fails, no cooling mode may be chosen. The

cause of the alert is usually a faulty thermistor in the T55, T56,

or T58 device, a shorted or open thermistor caused by a wiring

error, or a loose connection.

1. Turn on the compressor in question using Service Test

mode. If the compressor does not start, then most likely

the problem is one of the following: HPS open, open in-

ternal protection, circuit breaker trip, incorrect safety wir-

ing, or incorrect compressor wiring.

2. If the compressor does start, verify it is rotating in the cor-

rect direction.

IMPORTANT: Prolonged operation in the wrong direction

can damage the compressor. Correct rotation can be veri-

fied by a gage set and looking for a differential pressure

rise on start-up.

IMPORTANT: If the CS is always detecting current, verify

that the compressor is on. If the compressor is on, check

the contactor and the relay on the MBB. If the compressor

is off and there is no current, verify the CS wiring and

replace if necessary.

IMPORTANT: Return to Normal mode and observe com-

pressor operation to verify that compressor current sensor

is working and condenser fans are energized.

COMPRESSOR STUCK ON FAILURE ALARMS

Circuit A A051, A052, A053

Circuit B A055, A056, A057 — Alarm codes 051, 052, 053,

055, 056 and 057 are for compressors A1, A2, A3, B1, B2 and

B3. These alarms occur when the current sensor (CS) detects

current when the compressor should be off. When this occurs,

the control turns off the compressor.

T090 (Circuit A Discharge Pressure Transducer Failure)

T091 (Circuit B Discharge Pressure Transducer Failure) —

Alert codes 090 and 091 are for circuits A and B respectively.

These alerts occur when the pressure is outside the range of 0.0

to 667.0 psig. A circuit cannot run when this alert is active. Use

the scrolling marquee to reset the alert. The cause of the alert is

usually a faulty transducer, faulty 5-v power supply, or a loose

connection.

If the current sensor board reads ON while the compressor

relay has been commanded OFF for a period of 4 continuous

seconds, an alarm is generated. These alarms are only moni-

tored for a period of 10 seconds after the compressor relay has

been commanded OFF. This is done to facilitate a service tech-

nician forcing a relay to test a compressor.

In addition, if a compressor stuck failure occurs and the cur-

rent sensor board reports the compressor and the request off,

certain diagnostics will take place as follows:

T092 (Circuit A Suction Pressure Transducer Failure)

T093 (Circuit B Suction Pressure Transducer Failure)

—

Alert codes 092 and 093 are for circuits A and B respectively.

These alerts occur when the pressure is outside the range of 0.0

to 420.0 psig. A circuit cannot run when this alert is active. Use

the scrolling marquee to reset the alert. The cause of the alert is

usually a faulty transducer, faulty 5-v power supply, or a loose

connection.

T094 (Discharge Gas Thermistor Failure) — This alert oc-

curs for units which have the digital compressor installed on

circuit A. If discharge gas temperature is open or shorted, the

circuit will be shutoff. The alert will reset itself when discharge

temperature is less than 250 F (121.1 C). The cause of the alert

is usually low refrigerant charge or a faulty thermistor.

1. If any of the compressors are diagnosed as stuck on and

the current sensor board is on and the request is off, the

control will command the condenser fans to maintain

normal head pressure.

2. The control will shut off all other compressors.

The possible causes include welded contactor or frozen

compressor relay on the MBB.

To check out alarms A051-A057:

1. Place the unit in Service Test mode. All compressors

should be off.

2. Verify that there is not 24-v at the contactor coil. If there

is 24 v at the contactor, check relay on MBB and wiring.

T110 (Circuit A Loss of Charge)

T111 (Circuit B Loss of Charge) — Alert codes 110 and 111

are for circuits A and B respectively. These alerts occur when

the compressor is OFF and the suction pressure is less than

26 psig.

3. Check for welded contactor.

4. Verify CS wiring.

5. Return to Normal mode and observe compressor opera-

tion to verify that compressor current sensor is working

and condenser fans are energized.

A060 (Supply Air Thermistor Failure) — If the unit is re-

quired to use the supply air thermistor input (C.TYP 1, 3, 5, and

9) and the sensor reading is outside the range of –40 to 245 F

(–40 to 118 C) then the alarm will occur. The cause of the

alarm is usually a faulty thermistor, a shorted or open thermis-

tor caused by a wiring error, or a loose connection. If the sup-

ply temperature is being written to by CCN or a third party

T112 (Circuit A High Saturated Suction Temperature)

T113 (Circuit B High Saturated Suction Temperature)

—

Alert codes 112 and 113 occur when compressors in a circuit

have been running for at least 5 minutes and the circuit saturat-

ed suction temperature is greater than 70 F (21.1 C). The high

saturated suction alert is generated and the circuit is shut down.

T114 (Circuit A Low Superheat)

continues to rise to greater than 150 F (65.6 C), the alert will

occur and the circuit's remaining compressor will shut down.

The cause of the alarm is usually an overcharged system, high

outdoor ambient temperature coupled with dirty outdoor coil,

plugged filter drier, or a faulty high-pressure switch.

T115 (Circuit B Low Superheat) — Alert codes 114 and 115

occur when the superheat of a circuit is less than 5 F (2.8 C) for

5 continuous minutes. The low superheat alert is generated and

the circuit is shut down.

T118 (High Discharge Gas Temperature Alert)

A118 (High Discharge Gas Temperature Alarm)

A140 (Reverse Rotation Detected) — A test is made once, on

power up, for suction pressure change on the first activated cir-

cuit. The unit control determines failure as follows:

1. The suction pressure of both circuits is sampled 5 seconds

before the compressor is brought on, right when the com-

pressor is brought on and 5 seconds afterwards.

2. The rate of suction pressure change from 5 seconds be-

fore the compressor is brought on to when the compres-

sor is brought on is calculated.

3. The rate of suction pressure change from when the

compressor is brought on to 5 seconds afterwards is

calculated.

—

This

alert or alarm occurs for units which have the digital compres-

sor installed on circuit A. If discharge gas temperature is great-

er than 268 F (131.1 C), the circuit will be shut off. The alert

will reset itself when discharge temperature is less than 250 F

(121.1 C). If this alert occurs 3 times within a day, the A118

alarm will be generated and the alarm must be reset manually.

The cause of the alert is usually low refrigerant charge or a

faulty thermistor.

P120 (Circuit A Low Saturated Suction Temperature —

Compressor Shutdown)

T120 (Circuit A Low Saturated Suction Temperature Alert)

4. With the above information, the test for reverse rotation is

made. If the suction pressure change 5 seconds after com-

pression is greater than the suction pressure change 5 sec-

onds before compression – 1.25, then there is a reverse

rotation error.

A120 (Circuit A Low Saturated Suction Temperature

Alarm)

P121 (Circuit B Low Saturated Suction Temperature —

Compressor B2 Shutdown)

This alarm will disable mechanical cooling and will require

manual reset. This alarm may be disabled once the reverse ro-

tation check has been verified by setting REV.R = Yes.

A150 (Unit is in Emergency Stop) — If the CCN emergency

stop command is received, the alarm is generated and the unit

will be immediately stopped.

T121 (Circuit B Low Saturated Suction Temperature Alert)

A121 (Circuit B Low Saturated Suction Temperature

Alarm) — This alert or alarm is used to keep the evaporator

from freezing and the saturated suction temperature above the

low limit for the compressors.

When SSTA or SSTB is less than 20 F (–6.7 C) for 4 min-

utes, less than 10 F (–12.2 C) for 2 minutes, less than 0° F

(–17.8 C) for 1 minute, or less than –20 F (–28.9 C) for 20 sec-

onds continuously, one compressor of the affected circuit will

be shut down with a local alert (P120, P121) and a 10-minute

time guard will be added to the compressor. If saturated suction

temperature continues to be less than 20 F (–6.7 C) for 4 min-

utes, less than 10 F (–12.2 C) for 2 minutes, less than 0° F

(–17.8 C) for 1 minute, or less than –20 F (–28.9 C) for 20 sec-

onds continuously, then another compressor will be shut down

until the last compressor on the circuit is shut down at which

time an alert or alarm will be issued (T120, T121, A120,

A121).

This failure follows a 3 strike methodology whereby the

first two times a circuit goes down entirely, an alert will be gen-

erated (T120, T121) which keeps the circuit off for 15 minutes

before allowing the circuit to try again. The third time this hap-

pens, an alarm (A120, A121) will be generated which will ne-

cessitate a manual reset to get the circuit back running.

To recover from these alerts, a 10-minute hold off timer

must elapse and the saturated suction temperature must rise

above 29.32 F (–1.5 C). If recovery occurs, staging will be al-

lowed on the circuit again. Therefore, it is possible that multi-

ple P120 or P121 alerts may be stored in the alarm.

If there are 1 or 2 strikes on the circuit and the circuit

recovers for a period of time, it is possible to clear out the

strikes thereby resetting the strike counter automatically. The

control must have saturated suction temperature greater than or

equal to 34 F (1.1 C) for 60 minutes in order to reset the strike

counters.

If the CCN point name "EMSTOP" in the system table is set

to emergency stop, the unit will shut down immediately and

broadcast an alarm back to the CCN, indicating that the unit is

down. This alarm will clear when the variable is set back to

"enable."

A151 (Illegal Configuration) — An A151 alarm indicates an

invalid configuration has been entered. The following are ille-

gal configurations.

• Invalid unit size has been entered.

• Dual thermostat configured for single-circuit unit.

• Dual thermostat and switch demand limit configure

• AUX board incorrect revision.

• Unit configuration set to invalid type.

A152 (Unit Down Due to Failure) — Both circuits are off

due to alerts and/or alarms. Reset is automatic when all alarms

are cleared. This alarm indicates the unit is at 0% capacity.

T153 (Real Time Clock Hardware Failure) — A problem

has been detected with MBB real time clock hardware. Try re-

setting the power and check the indicator lights. If the alarm

continues, the board should be replaced.

A154 (Serial EEPROM Hardware Failure) — A problem

has been detected with the EEPROM on the MBB. Try reset-

ting the power and check the indicator lights. If the alarm con-

tinues, the board should be replaced.

T155 (Serial EEPROM Storage Failure Error) — A problem

has been detected with the EEPROM storage on the MBB. Try

resetting the power and check the indicator lights. If the alert

continues, the board should be replaced.

A156 (Critical Serial EEPROM Storage Failure Error) — A

problem has been detected with the EEPROM storage on the

MBB. Try resetting the power and check the indicator lights. If

the alarm continues, the board should be replaced.

A157 (A/D Hardware Failure) — A problem has been detect-

ed with A/D conversion on the boards. Try resetting the power

and check the indicator lights. If the alarm continues, the board

should be replaced.

T122 (Circuit A High Pressure Trip)

T123 (Circuit B High Pressure Trip) — Alert codes 122 and

123 are for circuits A and B respectively.

T126 (Circuit A High Head Pressure)

T127 (Circuit B High Head Pressure) — Alert codes 126 and

127 are for circuits A and B respectively. These alerts occur

when the appropriate saturated condensing temperature is

greater than 150 F (65.6 C). Prior to the alert, the control will

shut down one compressor on a circuit if that circuit's saturated

condensing temperature is greater than 145 F (62.8 C). If SCT

A170 (Loss of Communication with the Compressor

Expansion Module) — This alarm indicates that there are

communications problems with the compressor expansion,

which is required for unit sizes 070 to 100. The alarm will auto-

matically reset.

A173 (Energy Management Module Communication Fail-

ure) — This alarm indicates that there are communications

problems with the energy management. All functions per-

formed by the EMM will stop, which can include demand lim-

it, reset and capacity input. The alarm will automatically reset.

T174 (4 to 20 mA Cooling Set point Input Failure) — This

alert indicates a problem has been detected with cooling set

point 4 to 20 mA input. The input value is either less than 2 mA

or greater than 22 mA.

T176 (4 to 20 mA Reset Input Failure) — This alert indi-

cates a problem has been detected with reset 4 to 20 mA input.

The input value is either less than 2 mA or greater than 22 mA.

The reset function will be disabled when this occurs.

greater than 22 mA. The reset function will be disabled when

this occurs.

A200 (Fan Status Switch 1 Failure)

T201 (Fan Status Switch 1 Failure)

T202 (Fan Status Switch 2 Failure) — This alarm or alert in-

dicates the fan status input 1 or 2 is open when the unit is ON.

The unit will be in an alert condition until the fan status switch

is closed. The alarm or alert is an automatic reset when the fan

status switch closes. The A200 alarm is for single circuit units.

T303 (Condenser Coil Maintenance Due) — Coil Service

Countdown (C.L.DN) expired. Complete condenser coil clean-

ing and enter ‘YES’ for Coil Maintenance Done (C.L.MN)

item.

T500, T501, T502 (Current Sensor Board Failure — A xx

Circuit A)

T503, T504, T505 (Current Sensor Board Failure — B xx

Circuit B) — Alert codes 500, 501, 502, 503, 504, and 505 are

for compressors A1, A2, A3, B1, B2, and B3 respectively.

These alerts occur when the output of the current sensor (CS) is

a constant high value. These alerts reset automatically. If the

problem cannot be resolved, the CS board must be replaced.

T177 (4 to 20 mA Demand Limit Input Failure)

—

This

alert indicates a problem has been detected with demand limit

4 to 20 mA input. The input value is either less than 2 mA or

Table 26 — Alarm and Alert Codes

ALARM/

ALARM OR

ALERT

ACTION TAKEN

BY CONTROL

RESET

DESCRIPTION

WHY WAS THIS ALARM GENERATED?

Two compressors on circuit failed

ALERT CODE

METHOD

Circuit A Compressor

Availability Alert

Circuit B Compressor

Availability Alert

T048

T049

Alert

Circuit shut down

Manual

Circuit A

Compressor A1,A2,A3

Failure

Circuit B

Compressor B1,B2,B3

Failure

Circuit A

Compressor A1,A2,A3

Failure

Circuit B

Compressor B1,B2,B3

Failure

Respective current sensor board (CSB)

feedback signal does not match relay state

Respective compressor shut

down in Circuit A.

T051, T052, T053

T055, T056, T057

A051, A052, A053

A055, A056, A057

Alert

Manual

Respective current sensor board (CSB)

feedback signal does not match relay state

Respective compressor shut

down in Circuit B.

Respective current sensor board (CSB)

feedback signal is ON when the compressor

should be off

Respective current sensor board (CSB)

feedback signal is ON when the compressor

should be off

Alarm

Unit shut down

Supply Air

Thermistor outside range of –40 to 245 F

(–40 to 118 C)

A060

A061

T068

T069

Alarm

Alert

Unit shut down

Circuit shut down

Automatic

Thermistor Failure

Supply Air Temperature

Update not received

Return Air

Thermistor Failure

Return Air Temperature

Update not received

Circuit A Return Gas

Thermistor Failure

Circuit B Return Gas

Thermistor Failure

Temperature not updated during 3 minutes

Thermistor outside range of –40 to 245 F

(–40 to 118 C)

Temperature not updated during 3 minutes

Thermistor is outside range of –40 to 245 F

(–40 to 118 C)

Thermistor is outside range of –40 to 245 F

(–40 to 118 C)

Alert

Temperature reset disabled.

Unit runs under normal

control/set points.

Temperature reset disabled.

Unit runs under normal

control/set points.

Outside Air

Thermistor outside range of –40 to 245 F

(–40 to 118 C)

T073

T074

Alert

Automatic

Thermistor Failure

Space Temperature

Thermistor Failure

Thermistor outside range of –40 to 245 F

(–40 to 118 C)

Circuit A Discharge Pres-

sure Transducer Failure

Circuit B Discharge Pres-

sure Transducer Failure

Circuit A Suction Pressure

Transducer Failure

Circuit B Suction Pressure

Transducer Failure

The pressure is outside the range of

0.0 to 667.0 psig

The pressure is outside the range of

0.0 to 667.0 psig

The pressure is outside the range of

0.0 to 420.0 psig

The pressure is outside the range of

0.0 to 420.0 psig

T090

T091

T092

T093

T094

Alert

Circuit A shut down

Circuit B shut down

Automatic

Circuit A shut down

Circuit B shut down

Discharge Gas

Thermistor Failure

Discharge thermistor (DTT) is

either open or shorted

Digital compressor shut down.

LEGEND

CCN

CSB

CXB

DTT

—

Carrier Comfort Network^®

LWT

MBB

SCT

SST

— Leaving Fluid Temperature

— Main Base Board

Current Sensor Board

Compressor Expansion Module

Discharge Temperature Thermistor

— Saturated Condensing Temperature

— Saturated Suction Temperature

EEPROM — Electrically Erasable Programmable

TSTAT — Thermostat

Read-Only Memory

EMM

—

Energy Management Module

Table 26 — Alarm and Alert Codes (cont)

ALARM/

ALERT CODE

ALARM OR

ALERT

ACTION TAKEN

BY CONTROL

RESET

METHOD

DESCRIPTION

WHY WAS THIS ALARM GENERATED?

If the compressors are off and discharge pressure

reading is less than 26 psig for 30 sec.

If the compressors are off and discharge pressure

reading is less than 26 psig for 30 sec.

Circuit is on and saturated suction temperature is

greater than 70 F (15.6 C) for 5 minutes

Circuit is on and saturated suction temperature is

greater than 70 F (15.6 C) for 5 minutes

T110

T111

T112

T113

Alert

Circuit A Loss of Charge

Circuit B Loss of Charge

Circuit not allowed to start.

Circuit shut down

Manual

Circuit A High Saturated

Suction Temperature

Circuit B High Saturated

Suction Temperature

Circuit shut down

Automatic after first

daily occurance,

manual

Circuit A Low Suction

Superheat

Suction superheat is less than 5 F (2.8 C)

for 5 minutes.

Circuit A is shut down after

pumpdown complete.

T114

T115

Alert

thereafter

Automatic after first

daily occurance,

manual

Circuit B Low Suction

Superheat

Suction superheat is less than 5 F (2.8 C)

for 5 minutes.

Circuit B is shut down after

pumpdown complete.

thereafter

High Discharge

Discharge Thermistor (DTT) reading is

greater than 250 F

3 Discharge Gas Temperature alarms

occur within a day

T118

A118

Alert

Compressor A1 shut down

Automatic

Manual

Gas Temperature

High Discharge

Gas Temperature

Alarm

SSTA is less than 20 F for 4 minutes, less than

10 F for 2 minutes, less than 0° F for 1 minute or

less than –20 F for 20 seconds continuously

SSTA is less than 20 F for 4 minutes, less than

10 F for 2 minutes, less than 0° F for 1 minute or

less than –20 F for 20 seconds continuously

SSTA is less than 20 F for 4 minutes, less than

10 F for 2 minutes, less than 0° F for 1 minute or

less than –20 F for 20 seconds continuously and

only one compressor running

SSTB is less than 20 F for 4 minutes, less than

10 F for 2 minutes, less than 0° F for 1 minute or

less than –20 F for 20 seconds continuously

SSTB is less than 20 F for 4 minutes, less than

10 F for 2 minutes, less than 0° F for 1 minute or

less than –20 F for 20 seconds continuously and

only one compressor running

SSTB is less than 20 F for 4 minutes, less than

10 F for 2 minutes, less than 0° F for 1 minute or

less than –20 F for 20 seconds continuously and

only one compressor running

Circuit A Low

Circuit A will remove one

compressor stage.

P120

T120

Alert

Automatic

Saturated Suction

Automatic

unless

3rd strike.

Circuit A Low

Saturated Suction

Circuit A shut down

Circuit A Low

Saturated Suction

A120

P121

T121

Alarm

Alert

Manual

Circuit A Low

Saturated Suction

Circuit B will remove one

compressor stage.

Automatic

unless

3rd strike.

Circuit B Low

Saturated Suction

Circuit B shut down

Circuit B Low

Saturated Suction

A121

Alarm

Manual

High Pressure Switch

Trip Circuit A

High Pressure Switch

Trip Circuit B

T122

T123

Alert

High Pressure A Switch Input opento MBB

High Pressure B Switch Input open to MBB

Circuit shut down

Manual

Automatic, only

after first 3 daily

occurrences.

Circuit A High

T126

A126

T127

Alert

Alarm

Alert

SCTA >150 F

SCTB >150 F

Circuit shut down

Discharge Pressure

Circuit A High

Discharge Pressure

Manual

Automatic, only

after first 3 daily

occurrences

Circuit B High

Discharge Pressure

Circuit B High

A127

A140

Alarm

SCTB >150 F

Circuit shut down

Unit shut down.

Manual

Discharge Pressure

Reverse Rotation Detected

Incoming unit power leads not phased correctly

Manual

Automatic once

Unit shutdown without going CCN command for

A150

A151

Alarm

Emergency Stop

CCN emergency stop command received

One or more illegal configurations exists.

through pumpdown.

EMSTOP returns

to normal

Manual once

Unit is not allowed to start. configuration errors

are corrected

Illegal Configuration

Automatic once

alarms/alerts are

cleared that prevent

the chiller from

starting.

A152

Alarm

Unit Down Due to Failure

LEGEND

Both circuits are down due to alarms/alerts.

Unit is unable to run.

CCN

CSB

CXB

DTT

—

Carrier Comfort Network^®

LWT

MBB

SCT

SST

— Leaving Fluid Temperature

— Main Base Board

Current Sensor Board

Compressor Expansion Module

Discharge Temperature Thermistor

— Saturated Condensing Temperature

— Saturated Suction Temperature

EEPROM — Electrically Erasable Programmable

TSTAT — Thermostat

Read-Only Memory

EMM

—

Energy Management Module

Table 26 — Alarm and Alert Codes (cont)

ALARM/

ALERT CODE

ALARM OR

ALERT

ACTION TAKEN

BY CONTROL

RESET

METHOD

DESCRIPTION

WHY WAS THIS ALARM GENERATED?

Occupancy schedule will not

be used. Unit defaults to

Local On mode.

Automatic when

correct clock

control restarts.

Real Time Clock

Hardware Failure

T153

Alert

Internal clock on MBB fails

Serial EEPROM

Hardware Failure

Serial EEPROM

Storage Failure

A154

T155

Alarm

Alert

Hardware failure with MBB

Unit is unable to run.

No action

Manual

Configuration/storage failure with MBB

Critical Serial EEPROM

Storage Failure

A/D Hardware Failure

Loss of Communication

with CXB

A156

A157

A170

Alarm

Configuration/storage failure with MBB

Hardware failure with peripheral device

MBB loses communication with CXB

Unit is not allowed to run.

CXB functions disabled

Manual

Automatic

4 to 20 mA temperature

reset disabled. Demand Limit

set to 100%. 4 to 20 mA

set point disabled.

Loss of Communication

with EMM

A173

Alarm

MBB loses communication with EMM

Automatic

4 to 20 mA Cooling Set

Point/Desired % Capacity

Input Failure

If configured with EMM and input less than

2 mA or greater than 22 mA

Set point function/%

T174

T176

Alert

Automatic

capacity function disabled.

Reset function disabled.

Unit returns to normal

set point control.

4 to 20 mA Temperature

Reset Input Failure

If configured with EMM and input less than

2 mA or greater than 22 mA

Demand limit function

disabled. Unit returns to

100% demand limit control.

4 to 20 mA Demand Limit

Input Failure

If configured with EMM and input less than

2 mA or greater than 22 mA

T177

A200

T201

Alert

Alarm

Alert

Automatic

Fan Status

Switch 1 Open

Fan Status Switch 1

is open with Dual TSTAT

configuration

Alarm is generated when fan status switch 1

is open when the unit is in an ON state

Unit not allowed to start

Alert is generated when fan status switch 1

is open when Y1 or Y2 are closed

Circuit A is not allowed to run

Fan Status Switch 2

is open with Dual TSTAT

configuration

Alert is generated when fan status switch 1

is open when Y3 or Y4 are closed

T202

T303

Alert

Circuit B is not allowed to run

None

Automatic

Coil Service Countdown (C.L.DN) expired.

Complete condenser coil cleaning and enter ‘YES’

for Coil Maintenance Done (C.L.MN) item.

Condenser Coil

Maintenance Due

Current Sensor Board

A1 Failure

Current Sensor Board

A2 Failure

Current Sensor Board

A3 Failure

Current Sensor Board

B1 Failure

Current Sensor Board

B2 Failure

Current Sensor Board

B3 Failure

Alert occurs when CSB output

is a constant high value

Alert occurs when CSB output

is a constant high value

Alert occurs when CSB output

is a constant high value

Alert occurs when CSB output

is a constant high value

Alert occurs when CSB output

is a constant high value

Alert occurs when CSB output

is a constant high value

T500

T501

T502

T503

T504

T505

Alert

Compressor A1 shut down

Compressor A2 shut down

Compressor A3 shut down

Compressor B1 shut down

Compressor B2 shut down

Compressor B3 shut down

Automatic

LEGEND

CCN

CSB

CXB

DTT

—

Carrier Comfort Network^®

LWT

MBB

SCT

SST

— Leaving Fluid Temperature

— Main Base Board

Current Sensor Board

Compressor Expansion Module

Discharge Temperature Thermistor

— Saturated Condensing Temperature

— Saturated Suction Temperature

EEPROM — Electrically Erasable Programmable

TSTAT — Thermostat

Read-Only Memory

EMM

—

Energy Management Module

Table 27 — Example of Reading and Clearing Alarms

KEYPAD

ENTRY

SUB-MODE

CRNT

ITEM

ITEM EXPANSION

COMMENT

ACTIVE ALARMS (AXXX) OR

ALERTS (TXXX) DISPLAYED.

ENTER

AXXX or TXXX

CURRENTLY ACTIVE ALARMS

ESCAPE

CRNT

Use to clear active alarms/alerts

NO Flashes

ENTER

RCRN

YES

Select YES

Alarms/alerts clear, YES changes to NO

APPENDIX A — DISPLAY TABLES

Run Status Mode and Sub-Mode Directory

SUB-MODE

VIEW

ITEM

RAT

SAT

SETP

CTPT

LOD.F

DISPLAY

xxx.x ºF

xxx

ITEM DESCRIPTION

COMMENT

Return Air Temperature

Supply Air Temperature

Active Set Point

Control Point

Load/Unload Factor

0=Service Test

1=Off Local

2=Off CCN

3=Off Time

4=Off Emrgcy

5=On Local

6=On CCN

7=On Time

STAT

Control Mode

0=COOL OFF

1=LO COOL

2=HI COOL

3=COOL ON

SPT.M

Space Temp Control Mode

OCC

MODE

CAP

STGE

ALRM

TIME

YES/NO

xxx

Occupied

Override Modes in Effect

Percent Total Capacity

Requested Stage

Current Alarms & Alerts

Time of Day

xx.xx

00:00-23:59

1 - 12 (1 = January,

2 = February, etc.)

MNTH

Month of Year

DATE

YEAR

Day of Month

Year of Century

01-31

UNIT RUN HOUR AND START

RUN

HRS.U

STR.U

xxxx HRS

XXXX

Machine Operating Hours

Machine Starts

CIRC AND COMP RUN HOURS

HRS.A

HRS.B

HR.A1

HR.A2

HR.A3

HR.B1

HR.B2

HR.B3

xxxx HRS

Circuit A Run Hours

Circuit B Run Hours

Compressor A1 Run Hours

Compressor A2 Run Hours

Compressor A3 Run Hours

Compressor B1 Run Hours

Compressor B2 Run Hours

Compressor B3 Run Hours

HOUR

APPENDIX A — DISPLAY TABLES (cont)

Run Status Mode and Sub-Mode Directory (cont)

SUB-MODE

STRT

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

COMPRESSOR STARTS

ST.A1

ST.A2

ST.A3

ST.B1

ST.B2

ST.B3

XXXX

Compressor A1 Starts

Compressor A2 Starts

Compressor A3 Starts

Compressor B1 Starts

Compressor B2 Starts

Compressor B3 Starts

PREVENTIVE MAINTENANCE

COIL

SI.CL

COIL MAINTENANCE

Coil Cleaning Srvc Int

Coil Service Countdown

Coil Cleaning Maint.Done

COIL MAINTENANCE DATES

MM/DD/YY HH:MM

xxxx HRS

YES/NO

C.L.DN

C.L.MN

CL.DT

C.L.M0

C.L.M1

C.L.M2

C.L.M3

C.L.M4

User Entry

MM/DD/YY HH:MM

SOFTWARE VERSION NUMBERS

CESR131279-XXXXX

MBB

AUX

CXB

EMM

MARQ

NAVI

CESR131333-XXXXX

CESR131173-XXXXX

CESR131174-XXXXX

CESR131171-XXXXX

CESR130227-XXXXX

VERS

Service Test Mode and Sub-Mode Directory

SUB-MODE

TEST

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

To enable Service Test mode, move

Enable/Off/Remote contact switch to

OFF. Change TEST to ON.

Service Test Mode

Move switch to ENABLE

OUTPUTS

Fan 1 Relay

Fan 2 Relay

Fan 3 Relay

Fan 4 Relay

FAN1

FAN2

FAN3

FAN4

FAN5

V.HPA

V.HPB

DIG.P

LSV.A

LSV.B

RMT.A

ON/OFF

Fan 5 Relay

OUTS

Var Head Press % Cir A

Var Head Press % Cir B

Comp A1 Load Percent

Liquid Line Solenoid A

Liquid Line Solenoid B

Remote Alarm Relay

CIRCUIT A COMPRESSOR TEST

Compressor A1 Relay

Comp A1 Unload Time

Compressor A2 Relay

Compressor A3 Relay

Minimum Load Valve Relay

CIRCUIT B COMPRESSOR TEST

Compressor B1 Relay

Compressor B2 Relay

Compressor B3 Relay

CC.A1

UL.TM

CC.A2

CC.A3

MLV

ON/OFF

CMPA

CMPB

CC.B1

CC.B2

CC.B3

ON/OFF

APPENDIX A — DISPLAY TABLES (cont)

Temperature Mode and Sub-Mode Directory

SUB-MODE

UNIT

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

ENTERING AND LEAVING UNIT TEMPERATURES

RAT

SAT

OAT

SPT

SCT.D

xxx.x °F

xxx.x ΔF

Return Air Temperature

Supply Air Temperature

Outside Air Temperature

Space Temperature

Circuit SCT Difference

TEMPERATURES CIRCUIT A

Saturated Condensing Tmp

Saturated Suction Temp

Compr Return Gas Temp

Discharge Gas Temp

Suction Superheat Temp

TEMPERATURES CIRCUIT B

Saturated Condensing Tmp

Saturated Suction Temp

Compr Return Gas Temp

Suction Superheat Temp

SCT.A

SST.A

RGT.A

D.GAS

SH.A

xxx.x °F

xxx.x ΔF

CIR.A

CIR.B

SCT.B

SST.B

RGT.B

SH.B

xxx.x °F

xxx.x ΔF

Pressures Mode and Sub-Mode Directory

SUB-MODE

PRC.A

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

PRESSURES CIRCUIT A

XXX.XPSIG

DP.A

SP.A

Discharge Pressure

Suction Pressure

PRESSURES CIRCUIT B

PRC.B

DP.B

SP.B

XXX.XPSIG

Discharge Pressure

Suction Pressure

Set Points Mode and Sub-Mode Directory

SUB-MODE

ITEM

DISPLAY

ITEM DESCRIPTION

COOLING SET POINTS

Cooling Set Point 1

RANGE

COMMENT

CSP.1

CSP.2

SPS.P

SPT.O

STP.O

P.CAP

LCON

HCON

LCOF

xxx.x °F

xx.x ΔF

xxx.x °F

XXX

xx.x ΔF

40 to 80

65 to 80

Default: 55 F

Default: 50 F

Default: 78 F

Cooling Set Point 2

Space T Cool Set Point

Space Temperature Offset

Space T SP Plus Offset

Percent CAP Requested

Lo Cool On Set Point

HI Cool On Set Point

Lo Cool Off Set Point

HEAD PRESSURE SET POINTS

Head Set Point ON

COOL

–1 to 2

0.5 to 20

0.5 to 2

Default: 1

Default: 3

Default: 0.5

H.SP

HSPF

F.ON

F.OFF

F.DLT

F.TME

xxx.x °F

XX.X

85 to 120

45 to 90

Default: 110 F

Default: 72 F

Head Set Point OFF

Fan On Set Point

Fan Off Set Point

Fan Stage Delta

Fan Delta Active Time

HEAD

0 to 50

0 to 300

XXX

APPENDIX A — DISPLAY TABLES (cont)

Inputs Mode and Sub-Mode Directory

SUB-MODE

GEN.I

ITEM

DISPLAY

ITEM DESCRIPTION

GENERAL INPUTS

Start/Stop Switch

COMMENT

STST

IDFA

Y.1

Y.2

IDFB

Y.3

Y.4

DLS1

DLS2

ON/OFF

Indoor Fan Status-CIRA

Y1 Thermostat Input

Y2 Thermostat Input

Indoor Fan Status-CIRB

Y3 Thermostat Input

Y4 Thermostat Input

Demand Limit Switch 1

Demand Limit Switch 2

CIRCUIT INPUTS

FKA1

FKA2

FKA3

HPSA

FKB1

FKB2

FKB3

HPSB

ON/OFF

Compressor A1 Feedback

Compressor A2 Feedback

Compressor A3 Feedback

High Pressure Switch A

Compressor B1 Feedback

Compressor B2 Feedback

Compressor B3 Feedback

High Pressure Switch B

CRCT

4-20

4-20 MA INPUTS

DMND

RSET

CL.MA

XX.X

4-20 ma Demand Signal

4-20 ma Reset Signal

4-20 Cooling Demand

Outputs Mode and Sub-Mode Directory

SUB-MODE

GEN.O

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

GENERAL OUTPUTS

FAN1

FAN2

FAN3

FAN4

FAN5

MLV.R

V.HPA

V.HPB

ON/OFF

XXX

Fan 1 Relay

Fan 2 Relay

Fan 3 Relay

Fan 4 Relay

Fan 5 Relay

Minimum Load Valve Relay

Var Head Press Out Cir A

Var Head Press Out Cir B

XXX

OUTPUTS CIRCUIT A

CC.A1

DPE.R

D.SOL

CC.A2

CC.A3

LSV.A

ON/OFF

XXX

ON/OFF

Compressor A1 Relay

Comp A1 Load Percent

Digital Scroll Solenoid

Compressor A2 Relay

Compressor A3 Relay

Liquid Line Solenoid A

CIR.A

CIR.B

OUTPUTS CIRCUIT B

CC.B1

CC.B2

CC.B3

LSV.B

ON/OFF

Compressor B1 Relay

Compressor B2 Relay

Compressor B3 Relay

Liquid Line Solenoid B

APPENDIX A — DISPLAY TABLES (cont)

Configuration Mode and Sub-Mode Directory

SUB-MODE

DISP

ITEM

DISPLAY

ITEM DESCRIPTION

DISPLAY CONFIGURATION

Test Display LEDs

COMMENT

TEST

METR

ON/OFF

Metric Display

Off = English On = Metric

Default: 0

0 = English

1 = Espanol

2 = Francais

3 = Portuguese

LANG

Language Selection

PAS.E

PASS

ENBL/DSBL

XXXX

Password Enable

Service Password

UNIT CONFIGURATION

Unit Size

SIZE

NCKT

SZ.A1

SZ.A2

SZ.A3

SZ.B1

SZ.B2

SZ.B3

FAN.S

A1.TY

MAX.T

YES/NO

Number of Refrigerant Circuits

Compressor A1 Size

Compressor A2 Size

Compressor A3 Size

Compressor B1 Size

Compressor B2 Size

Compressor B3 Size

Fan Sequence Number

Compressor A1 Digital

Maximum A1 Unload Time

CCN NETWORK CONFIGS

UNIT

Default: 1

CCNA

CCNB

XXX

CCN Address

Range: 0 to 239

Default: 1

Range: 0 to 239

CCN Bus Number

CCN

Default: 3

1 = 2400

2 = 4800

3 = 9600

4 =19,200

5 =38,400

BAUD

CCN Baud Rate

UNIT OPTIONS 1 HARDWARE

Minimum Load Valve Select

CSB Boards Enable

MLV.S

CSB.E

SPT.S

SPOS

SPOR

YES/NO

ENBL/DSBL

Space Temp Sensor

Space Temp Offset Enable

Space Temp Offset Range 1 to 10

Default: 0

0 = 5 K

1 = 10 K

2 = None

Default: 0

0 = 5 K

1 = 10 K

2 = None

OPT1

RAT.T

RAT Thermistor Type

SAT Thermistor Type

SAT.T

EMM

YES/NO

EMM Module installed

UNIT OPTIONS 2 CONTROLS

Default: 4

1 = VAV

2 = Invalid

3 = TSTAT MULTI

4 = TSTAT 2 STG

5 = SPT MULTI

6 = Invalid

C.TYP

Machine Control Type

7 = PCT CAP

8 = DUAL TSTAT

9 = VAV SETPOINT

Default: 0

0 = Enable/Off/Remote Switch

1 = Occupancy

OPT2

CTRL

LOAD

Control Method

2 = CCN Control

Default: 1

1 = Equal

2 = Staged

Loading Sequence Select

Default: 1

1 = Automatic

LLCS

DELY

Lead/Lag Circuit Select

Minutes Off Time

2 = Circuit A Leads

3 = Circuit B Leads

Default: 0

Range: 0 to 15 Minutes

APPENDIX A — DISPLAY TABLES (cont)

Configuration Mode and Sub-Mode Directory (cont)

SUB-MODE

M.MST

ITEM

DISPLAY

ITEM DESCRIPTION

MOTORMASTER

COMMENT

MMR.S

P.GAN

YES/NO

Motormaster Select

Default: 1

Range: 1 to 4

Default: 0.1

Range: -20 to 20

Head Pressure P Gain

I.GAN

XX.X

Head Pressure I Gain

Default: 0.0

Range: -20 to 20

D.GAN

MIN.S

XX.X

Head Pressure D Gain

Minimum Fan Speed

RESET COOL TEMP

Default: 0

0 = No Reset

1 = 4 to 20 mA Input

2 = Outdoor Air Temperature

3 = Return Temperature

4 = Space Temperature

CRST

Cooling Reset Type

Default: 0.0 ΔF

MA.DG

RM.NO

RM.F

XX.XΔF

XXX.X °F

XX.X °F

XXX.XΔF

XX.X °F

4-20 - Degrees Reset

Remote - No Reset Temp

Remote - Full Reset Temp

Remote - Degrees Reset

Return - No Reset Temp

Return - Full Reset Temp

Return - Degrees Reset

Range: -30 to 30 ΔF

Default: 125 F

Range: 0º to125 F

Default: 0 F

Range: 0º to125 F

Default: 0.0 ΔF

Range: -30 to 30 ΔF

Default: 10.0 ΔF

Range: 0º to125 F

Default: 0 ΔF

Range: 0º to125 F

Default: 0.0 ΔF

Range: -30 to 30 ΔF

RM.DG

RT.NO

RT.F

RSET

RT.DG

Default: 0

0 = None

DMDC

Demand Limit Select

1 = Switch

2 - 4 to 20 mA Input

3 = CCN Loadshed

Default: 100%

DM20

SHNM

SHDL

SHTM

DLS1

DLS2

XXX%

XXX

Demand Limit at 20 mA

Loadshed Group Number

Loadshed Demand Delta

Maximum Loadshed Time

Demand Limit Switch 1

Demand Limit Switch 2

Range: 0 to 100%

Default: 0

Range: 0 to 99

Default: 0%

Range: 0 to 60%

XXX%

XXX

Default: 60 minutes

Range: 0 to 120 minutes

Default: 80%

Range: 0 to 100%

Default: 50%

Range: 0 to 100%

XXX%

SETPOINT AND RAMP LOAD

Ramp Load Select

RL.S

ENBL/DSBL

Default: Enable

Default: 1.0

Range: 0.3 to 2

Default: 1

Range: 1 to 99

Default: 1

Range: 1 to 4

CRMP

Cooling Ramp Loading

Schedule Number

SLCT

SCHD

Z.GN

X.X

Deadband Multiplier

SERVICE CONFIGURATION

Enable Compressor A1

Enable Compressor A2

Enable Compressor A3

Enable Compressor B1

Enable Compressor B2

Enable Compressor B3

Enable Compressor FBack

Reverse Rotation Enable

EN.A1

EN.A2

EN.A3

EN.B1

EN.B2

EN.B3

EN.FB

REV.R

YES/NO

SERV

BCST

BROADCAST CONFIGURATION

CCN Time/Date Broadcast

CCN OAT Broadcast

T.D.B

OAT.B

G.S.B

BC.AK

ON/OFF

Global Schedule Broadcst

CCN Broadcast Ack'er

APPENDIX A — DISPLAY TABLES (cont)

Time Clock Mode and Sub-Mode Directory

SUB-MODE

TIME

ITEM

DISPLAY

ITEM DESCRIPTION

TIME OF DAY

Hour and Minute

COMMENT

HH.MM

XX.XX

Military (00:00 - 23:59)

MONTH, DATE, DAY, AND YEAR

1 - 12 (1 = January,

2 = February, etc.)

Range: 01 -31

1 - 7 (1 = Sunday,

2 = Monday, etc.)

MNTH

DOM

DAY

Month of Year

DATE

Day of Month

Day of Week

YEAR

XXXX

Year of Century

DAYLIGHT SAVINGS TIME

STR.M

STR.W

STR.D

MIN.A

STP.M

STP.W

STP.D

MIN.S

Month

Week

Day

Default: 4 Range 1- 12

Default: 1 Range 1- 5

Default: 7 Range 1- 7

Default: 60 Range 0 - 99

Default: 10 Range 1- 12

Default: 5 Range 1- 5

Default: 7 Range 1- 7

Default: 60 Range 0 - 99

DST

Minutes to Add

Month

Week

Day

Minutes to Subtract

HOL.L

HD.01

LOCAL HOLIDAY SCHEDULES

HOLIDAY SCHEDULE 01

MON

DAY

LEN

Holiday Start Month

Start Day

Duration (days)

HOLIDAY SCHEDULE 02

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

HD.02

HD.03

HD.04

HD.05

HD.06

HD.07

HD.08

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 03

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 04

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 05

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 06

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 07

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 08

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

01-31

APPENDIX A — DISPLAY TABLES (cont)

Time Clock Mode and Sub-Mode Directory (cont)

SUB-MODE

HD.09

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

HOLIDAY SCHEDULE 09

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

01-31

HOLIDAY SCHEDULE 10

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

HD.10

HD.11

HD.12

HD.13

HD.14

HD.15

HD.16

HD.17

HD.18

HD.19

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 11

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 12

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 13

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 14

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 15

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 16

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 17

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 18

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 19

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

01-31

APPENDIX A — DISPLAY TABLES (cont)

Time Clock Mode and Sub-Mode Directory (cont)

SUB-MODE

HD.20

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

HOLIDAY SCHEDULE 20

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

01-31

HOLIDAY SCHEDULE 21

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

HD.21

HD.22

HD.23

HD.24

HD.25

HD.26

HD.27

HD.28

HD.29

HD.30

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 22

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 23

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 24

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 25

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 26

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 27

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 28

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 29

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

HOLIDAY SCHEDULE 30

01-31

1 - 12 (1 = January,

2 = February, etc.)

MON

Holiday Start Month

DAY

LEN

Start Day

Duration (days)

01-31

APPENDIX A — DISPLAY TABLES (cont)

Time Clock Mode and Sub-Mode Directory (cont)

SUB-MODE

SCH.N

ITEM

DISPLAY

ITEM DESCRIPTION

Schedule Number 0

COMMENT

SCH.L

LOCAL OCCUPANCY SCHEDULE

OCCUPANCY PERIOD 1

OCC.1

UNC.1

MON.1

TUE.1

WED.1

THU.1

FRI.1

SAT.1

SUN.1

HOL.1

XX:XX

Period Occupied Time

Military (00:00 - 23:59)

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

YES/NO

PER.1

PER.2

PER.3

PER.4

PER.5

Saturday In Period

Sunday In Period

Holiday In Period

OCCUPANCY PERIOD 2

XX:XX

OCC.2

UNC.2

MON.2

TUE.2

WED.2

THU.2

FRI.2

SAT.2

SUN.2

HOL.2

Period Occupied Time

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

Military (00:00 - 23:59)

YES/NO

Saturday In Period

Sunday In Period

Holiday In Period

OCCUPANCY PERIOD 3

XX:XX

OCC.3

UNC.3

MON.3

TUE.3

WED.3

THU.3

FRI.3

SAT.3

SUN.3

HOL.3

Period Occupied Time

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

Military (00:00 - 23:59)

YES/NO

Saturday In Period

Sunday In Period

Holiday In Period

OCCUPANCY PERIOD 4

XX:XX

OCC.4

UNC.4

MON.4

TUE.4

WED.4

THU.4

FRI.4

SAT.4

SUN.4

HOL.4

Period Occupied Time

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

Military (00:00 - 23:59)

YES/NO

Saturday In Period

Sunday In Period

Holiday In Period

OCCUPANCY PERIOD 5

XX:XX

OCC.5

UNC.5

MON.5

TUE.5

WED.5

THU.5

FRI.5

SAT.5

SUN.5

HOL.5

Period Occupied Time

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

Military (00:00 - 23:59)

YES/NO

Saturday In Period

Sunday In Period

Holiday In Period

APPENDIX A — DISPLAY TABLES (cont)

Time Clock Mode and Sub-Mode Directory (cont)

SUB-MODE

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

OCCUPANCY PERIOD 6

OCC.6

UNC.6

MON.6

TUE.6

WED.6

THU.6

FRI.6

SAT.6

SUN.6

HOL.6

XX:XX

Period Occupied Time

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

Military (00:00 - 23:59)

YES/NO

PER.6

Saturday In Period

Sunday In Period

Holiday In Period

OCCUPANCY PERIOD 7

OCC.7

UNC.7

MON.7

TUE.7

WED.7

THU.7

FRI.7

SAT.7

SUN.7

HOL.7

XX:XX

Period Occupied Time

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

Military (00:00 - 23:59)

YES/NO

PER.7

Saturday In Period

Sunday In Period

Holiday In Period

OCCUPANCY PERIOD 8

OCC.8

UNC.8

MON.8

TUE.8

WED.8

THU.8

FRI.8

SAT.8

SUN.8

HOL.8

XX:XX

Period Occupied Time

Period Unoccupied Time

Monday In Period

Tuesday In Period

Wednesday In Period

Thursday In Period

Friday In Period

Military (00:00 - 23:59)

YES/NO

PER.8

Saturday In Period

Sunday In Period

Holiday In Period

SCHEDULE OVERRIDE

OVR.T

OVR.L

SPT.O

T.OVR

Timed Override Hours

Override Time Limit

Space Temperature Offset

Timed Override

Default: 0 Range 0-4 hours

OVR

XX.X

YES/NO

User Entry

APPENDIX A — DISPLAY TABLES (cont)

Operating Mode and Sub-Mode Directory

SUB-MODE

ITEM

DISPLAY

ITEM DESCRIPTION

MODES CONTROLLING UNIT

Ramp Load Limited

COMMENT

MD05

MD06

MD09

MD10

MD14

MD15

MD17

MD18

MDTG

MD21

MD22

MD23

MD25

ON/OFF

Timed Override in effect

Slow Change Override

Minimum OFF time active

Temperature Reset

Demand Limited

MODE

Low Temperature Cooling

High Temperature Cooling

Time Guard Active

High SCT Circuit A

High SCT Circuit B

Minimum Comp. On Time

Low Sound Mode

TASK STATES

0 = OFF

1 = ALLOW TO RUN

2 = PRE START

3 = STARTING

4 = RUNNING

TKCA

TKCB

Circuit A State

Circuit B State

5 = STOPPING

0 = OFF

1 = ALLOW TO RUN

2 = PRE START

3 = STARTING

4 = RUNNING

TSKS

5 = STOPPING

0 = OFF

1 = PRE-START DETERMINATION

2 = PRE START

TKFA

TKFB

Circuit A Fan State

Circuit B Fan State

3 = NORMAL

4 = STOPPING

0 = OFF

1 = PRE-START DETERMINATION

2 = PRE START

3 = NORMAL

4 = STOPPING

Alarms Mode and Sub-Mode Directory

SUB-MODE

CRNT

ITEM

DISPLAY

ITEM DESCRIPTION

COMMENT

CURRENTLY ACTIVE ALARMS

AXXX

TXXX

PXXX

Alarms are hown as AXXX

Alerts are shown as TXXX

Current Alarms 1-25

RCRN

YES/NO

Reset All Current Alarms

ALARM HISTORY

AXXX

TXXX

PXXX

HIST

Alarms are shown as AXXX

Alerts are shown as TXXX

Alarm History 1-20

APPENDIX B — CCN TABLES

Status Tables

DESCRIPTION

TSTAT_IN (Thermostat Input)

Indoor Fan Status-CIRA

Y1 Thermostat Input

VALUE

UNITS

POINT NAME

Off/On

IDFA_FS

IDFB_FS

Y2 Thermostat Input

Indoor Fan Status-CIRB

Y3 Thermostat Input

Y4 Thermostat Input

A_UNIT (General Unit Parameters)

Control Mode

10-char ASCII

STAT

SPTMODE

OCC

Space Temp Control Mode

Occupied

No/Yes

CCN Chiller

Alarm State

4-20 Cooling Demand

Active Demand Limit

Override Modes in Effect

Percent Total Capacity

Requested Stage

stop/start

6-char ASCII

NN.n

CHIL_S_S

ALM

COOL_MA

DEM_LIM

MODE

milliAmps

NNN

No/Yes

NNN

CAP_T

STAGE

Active Set Point

Control Point

Return Air Temperature

Supply Air Temperature

Emergency Stop

NNN.n

degF

CTRL_PNT

RETURN_T

SUPPLY_T

EMSTOP

MIN_LEFT

Enable/EMStop

5-char ASCII

Minutes Left for Start

CIRCA_AN (Circuit A Analog Parameters)

Percent Total Capacity

Percent Available Capacity

Discharge Pressure

NNN

CAPA_T

CAPA_A

DP_A

NNN.n

PSIG

degF

deltaF

Suction Pressure

Head Set Point ON

Head Set Point OFF

SP_A

HSP_ON

HSP_OFF

SCTA

SSTA

VHPA_ACT

RGTA

Saturated Condensing Temperature

Saturated Suction Temperature

Variable Head Press Out Circuit A

Compressor Return Gas Temperature

Discharge Gas Temperature

Suction Superheat Temperature

CIRCADIO (Circuit A Discrete Inputs/Outputs)

CIRC.A DISCRETE OUTPUTS

Compressor A1 Relay

DIGCMPDT

SH_A

Off/On

NNN.n

Off/On

K_A1_RLY

DIGITAL%

K_A2_RLY

K_A3_RLY

MLV_RLY

LLSV_A

Comp A1 Load Percent

Compressor A2 Relay

Compressor A3 Relay

Minimum Load Valve Relay

Liquid Line Solenoid A

CIRC.A DISCRETE INPUTS

Compressor A1 Feedback

Compressor A2 Feedback

Compressor A3 Feedback

High Pressure Switch A

Off/On

K_A1_FBK

K_A2_FBK

K_A3_FBK

HPSA

Open/Close

APPENDIX B — CCN TABLES (cont)

Status Tables (cont)

DESCRIPTION

CIRCB_AN (Circuit B Analog Parameters)

Percent Total Capacity

Percent Available Capacity

Discharge Pressure

VALUE

UNITS

POINT NAME

NNN

CAPB_T

CAPB_A

DP_B

SP_B

SCTB

SSTB

VHPB_ACT

RGTB

NNN.n

PSIG

degF

Suction Pressure

Saturated Condensing Temperature

Saturated Suction Temperature

Variable Head Press Out Circuit B

Compressor Return Gas Temperature

Suction Superheat Temperature

CIRCBDIO (Circuit B Discrete Inputs/Outputs)

CIRC.B DISCRETE OUTPUTS

Compressor B1 Relay

Compressor B2 Relay

Compressor B3 Relay

Minimum Load Valve Relay

Liquid Line Solenoid B

CIRC.B DISCRETE INPUTS

Compressor B1 Feedback

Compressor B2 Feedback

Compressor B3 Feedback

High Pressure Switch B

OPTIONS (Unit Parameters)

FANS

degF

deltaF

SH_B

Off/On

K_B1_RLY

K_B2_RLY

K_B3_RLY

MLV_RLY

LLSV_B

Off/On

K_B1_FBK

K_B2_FBK

K_B3_FBK

HPSB

Open/Close

Fan Stage Circuit A

Fan Stage Circuit B

NNN

FANSTGEA

FANSTGEB

FAN_1

FAN_2

FAN_3

Fan 1 Relay

Fan 2 Relay

Fan 3 Relay

Fan 4 Relay

Off/On

FAN_4

FAN_5

Fan 5 Relay

UNIT ANALOG VALUES

Return Air Temperature

Supply Air Temperature

Circuit SCT Difference

TEMPERATURE RESET

4-20 ma Reset Signal

NNN.n

degF

deltaF

RETURN_T

SUPPLY_T

SCTDELTA

NN.n

NNN.n

milliAmps

degF

RST_MA

OAT

SPT

Outside Air Temperature

Space Temperature

DEMAND LIMIT

4-20 ma Demand Signal

Demand Limit Switch 1

Demand Limit Switch 2

CCN Loadshed Signal

MISCELLANEOUS

NN.n

Off/On

milliAmps

LMT_MA

DMD_SW1

DMD_SW2

DL_STAT

Supply Air Set Point

NNN.n

degF

SAT_SP

APPENDIX B — CCN TABLES (cont)

CCN Configuration Tables

DESCRIPTION

UNIT (Unit Configuration)

VALUE

UNITS

POINT NAME

Unit Size

Number of Refrig Ckts

Compressor A1 Size

Compressor A2 Size

Compressor A3 Size

Compressor B1 Size

Compressor B2 Size

Compressor B3 Size

NNN

tons

SIZE

NUMCKTS

SIZE_A1

SIZE_A2

SIZE_A3

SIZE_B1

SIZE_B2

SIZE_B3

NNN

tons

Fan Sequence Number

Compressor A1 Digital

Maximum A1 Unload Time

OPTIONS1 (Options 1 Configuration)

Motormaster Select

FAN_TYPE

CPA1TYPE

MAXULTME

No/Yes

secs

No/Yes

Disable/Enable

MM_SLCT

MLV_FLG

CSB_ENA

SPTSENS

SPTOSENS

SPTO_RNG

RATTYPE

SATTYPE

EMM_BRD

Minimum Load Valve Select

CSB Boards Enable

Space Temperature Sensor

Space Temperature Offset Enable

Space Temperature Offset Range

RAT Thermistor Type

deltaF

SAT Thermistor Type

EMM Module Installed

No/Yes

OPTIONS2 (Options 2 Configuration)

Machine Control Type

CTRLTYPE

CONTROL

SEQ_TYPE

LEAD_TYP

RAMP_EBL

DELAY

Control Method

Loading Sequence Select

Lead/Lag Circuit Select

Ramp Load Select

Disable/Enable

Minutes Off Time

mins

Deadband Multiplier

N.n

Z_GAIN

SCHEDOVR (Timed Override Set Up)

Schedule Number

SCHEDNUM

OTL

OVR_EXT

TIMEOVER

Override Time Limit

Timed Override Hours

hours

Timed Override

No/Yes

RESETCON (Temperature Reset and Demand Limit)

COOLING RESET

Cooling Reset Type

4-20 MA RESET

4-20 - Degrees Reset

CRST_TYP

420_DEG

NNN.n

deltaF

REMOTE RESET

Remote - No Reset Temperature

Remote - Full Reset Temperature

Remote - Degrees Reset

RETURN TEMPERATURE RESET

Return - No Reset Temperature

Return - Full Reset Temperature

Return - Degrees Reset

DEMAND LIMIT

NNN.n

degF

deltaF

REM_NO

REM_FULL

REM_DEG

NNN.n

deltaF

RTN_NO

RTN_FULL

RTN_DEG

Demand Limit Select

NNN

DMD_CTRL

DMT20MA

SHED_NUM

SHED_DEL

SHED_TIM

DLSWSP1

DLSWSP2

Demand Limit at 20 mA

Loadshed Group Number

Loadshed Demand Delta

Maximum Loadshed Time

Demand Limit Switch 1

Demand Limit Switch 2

mins

NNN

APPENDIX B — CCN TABLES (cont)

CCN Configuration Tables (cont)

DESCRIPTION

DISPLAY (Marquee Display Set Up)

Service Password

VALUE

UNITS

POINT NAME

NNNN

Disable/Enable

Off/On

PASSWORD

PASS_EBL

DISPUNIT

Password Enable

Metric Display

Language Selection

HPA (Head Pressure)

SCT Delta for Compressor A1

SCT Delta for Compressor A2

HPB (Head Pressure)

SCT Delta for Comp B1

SCT Delta for Comp B2

SERVICE

LANGUAGE

NNN.n

deltaF

A1SCTDT

A2SCTDT

NNN.n

deltaF

B1SCTDT

B2SCTDT

Enable Compressor A1

Enable Compressor A2

Enable Compressor A3

Enable Compressor B1

Enable Compressor B2

Enable Compressor B3

SET POINT

Disable/Enable

ENABLEA1

ENABLEA2

ENABLEA3

ENABLEB1

ENABLEB2

ENABLEB3

COOLING

Cooling Set Point 1

Cooling Set Point 2

NNN.n

NN.n

degF

deltaF

degF

deltaF

CSP1

CSP2

SPT_SP

SPTO

SPSP_PO

DMDLCON

DMDHCON

DMDLCOFF

Space T Cool Set Point

Space Temperature Offset

Space T SP Plus Offset

Lo Cool On Set Point

HI Cool On Set Point

Lo Cool Off Set Point

RAMP LOADING

NN.n

Cooling Ramp Loading

Head Set Point ON

Head Set Point OFF

Fan On Set Point

Fan Off Set Point

Fan Stage Delta

Fan Delta Active Time

Unload Time Threshold

N.n

CRAMP

HSP_ON

NNN.n

NNN

degF

deltaF

secs

HSP_OFF

FANONSP

FANOFFSP

FSTGDLTA

FANDLTTM

UTTHRESH

secs

CCN Maintenance Tables

DESCRIPTION

STRTHOUR (Maintenance Display)

Machine Operating Hours

Machine Starts

VALUE

UNITS

POINT NAME

NNNNNN

NNNNNN.n

NNNNNN

NNNNNN.n

NNNNNN

hours

HR_MACH

CY_MACH

HR_CIRA

HR_A1

HR_A2

HR_A3

HR_CIRB

HR_B1

HR_B2

HR_B3

CY_CIRA

CY_A1

CY_A2

CY_A3

CY_CIRB

CY_B1

CY_B2

Circuit A Run Hours

hours

Compressor A1 Run Hours

Compressor A2 Run Hours

Compressor A3 Run Hours

Circuit B Run Hours

Compressor B1 Run Hours

Compressor B2 Run Hours

Compressor B3 Run Hours

Circuit A Starts

Compressor A1 Starts

Compressor A2 Starts

Compressor A3 Starts

Circuit B Starts

Compressor B1 Starts

Compressor B2 Starts

Compressor B3 Starts

CY_B3

APPENDIX B — CCN TABLES (cont)

CCN Maintenance Tables (cont)

DESCRIPTION

CURRMODS (Maintenance Display)

Ramp Load Limited

Timed Override in effect

Slow Change Override

Minimum OFF time active

Temperature Reset

Demand Limited

VALUE

UNITS

POINT NAME

Off/On

MODE_5

MODE_6

MODE_9

MODE_10

MODE_14

MODE_15

MODE_17

MODE_18

MODE_21

MODE_22

MODE_23

MODE_25

MODE_TG

Low Temperature Cooling

High Temperature Cooling

High SCT Circuit A

High SCT Circuit B

Minimum Comp. On Time

Low Sound Mode

Time Guard Active

Alarms (Maintenance Display)

Active Alarm #1

4-char ASCII

ALARM01C

ALARM02C

ALARM03C

ALARM04C

ALARM05C

ALARM06C

ALARM07C

ALARM08C

ALARM09C

ALARM10C

ALARM11C

ALARM12C

ALARM13C

ALARM14C

ALARM15C

ALARM16C

ALARM17C

ALARM18C

ALARM19C

ALARM20C

ALARM21C

ALARM22C

ALARM23C

ALARM24C

ALARM25C

Active Alarm #2

Active Alarm #3

Active Alarm #4

Active Alarm #5

Active Alarm #6

Active Alarm #7

Active Alarm #8

Active Alarm #9

Active Alarm #10

Active Alarm #11

Active Alarm #12

Active Alarm #13

Active Alarm #14

Active Alarm #15

Active Alarm #16

Active Alarm #17

Active Alarm #18

Active Alarm #19

Active Alarm #20

Active Alarm #21

Active Alarm #22

Active Alarm #23

Active Alarm #24

Active Alarm #25

Versions (Software Versions)

MBB CESR131279-

AUX CESR131333-

CXB CESR131173-

EMM CESR131174-

MARQUEE CESR131171-

NAVIGATOR CESR130227-

LOADFACT (Maintenance Display)

Load/Unload Factor

Control Point

Return Air Temperature

Supply Air Temperature

Ramp Load Limited

Slow Change Override

Low Temperature Cooling

High Temperature Cooling

Minimum Comp. On Time

LEARNFNS (Maintenance Display)

SCT Delta for Comp A1

SCT Delta for Comp A2

SCT Delta for Comp B1

SCT Delta for Comp B2

5-char ASCII

NNN

SMZ

NNN.n

Off/On

degF

CTRL_PNT

RETURN_T

SUPPLY_T

MODE_5

MODE_9

MODE_17

MODE_18

MODE_23

NNN.n

deltaF

A1SCTDT

A2SCTDT

B1SCTDT

B2SCTDT

APPENDIX B — CCN TABLES (cont)

CCN Maintenance Tables (cont)

DESCRIPTION

PM-COIL (Maintenance Display)

Coil Cleaning Srvc Inter

Coil Service Countdown

Coil Cleaning Maint.Done

Coil Cleaning Maint.Date

TESTMODE (Maintenance Display)

Service Test Mode

VALUE

UNITS

POINT NAME

NNNNN

No/Yes

15-char ASCII

hours

SI_COIL

CL_CDOWN

CL_MAINT

COIL_PM0

COIL_PM1

COIL_PM2

COIL_PM3

COIL_PM4

Off/On

NET_CTRL

S_A1_RLY

S_A2_RLY

S_A3_RLY

S_B1_RLY

S_B2_RLY

S_B3_RLY

S_FAN_1

S_FAN_2

S_FAN_3

S_FAN_4

S_FAN_5

S_LLSV_A

S_LLSV_B

S_A1ULTM

S_MLV

Compressor A1 Relay

Compressor A2 Relay

Compressor A3 Relay

Compressor B1 Relay

Compressor B2 Relay

Compressor B3 Relay

Fan 1 Relay

Fan 2 Relay

Fan 3 Relay

Fan 4 Relay

Fan 5 Relay

Liquid Line Solenoid A

Liquid Line Solenoid B

Comp A1 Unload Time

Minimum Load Valve Relay

Remote Alarm Relay

secs

Off/On

S_ALM

RUNTEST (Maintenance Display)

Percent Total Capacity

Percent Available Capacity

Discharge Pressure

NNN

CAPA_T

CAPA_A

DP_A

NNN.n

Off/On

NNN

PSIG

degF

deltaF

Suction Pressure

Head Set Point ON

Head Set Point OFF

SP_A

HSP_ON

HSP_OFF

SCTA

SSTA

RGTA

Saturated Condensing Temperature

Saturated Suction Temperature

Compr Return Gas Temperature

Discharge Gas Temperature

Suction Superheat Temperature

Compressor A1 Relay

Compressor A2 Relay

Compressor A3 Relay

Minimum Load Valve Relay

Compressor A1 Feedback

Compressor A2 Feedback

Compressor A3 Feedback

Percent Total Capacity

Percent Available Capacity

Discharge Pressure

DIGCMPDT

SH_A

K_A1_RLY

K_A2_RLY

K_A3_RLY

MLV_RLY

K_A1_FBK

K_A2_FBK

K_A3_FBK

CAPB_T

CAPB_A

DP_B

NNN

NNN.n

Off/On

PSIG

degF

deltaF

Suction Pressure

Head Set Point ON

Head Set Point OFF

SP_B

HSP_ON

HSP_OFF

SCTB

Saturated Condensing Temperature

Saturated Suction Temperature

Compr Return Gas Temperature

Suction Superheat Temperature

Compressor B1 Relay

Compressor B2 Relay

Compressor B3 Relay

Minimum Load Valve Relay

SSTB

RGTB

SH_B

K_B1_RLY

K_B2_RLY

K_B3_RLY

MLV_RLY

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53380003-01

Printed in U.S.A.

Form 38AP-1T

Pg 86

210

11-09

Replaces: New

START-UP CHECKLIST FOR 38AP SPLIT SYSTEM CONDENSING UNIT

(Remove and use for Job File)

I. Project Information

JOB NAME ______________________________________________________________________________

ADDRESS _______________________________________________________________________________

CITY ____________________________________________ STATE _______________ ZIP______________

INSTALLING CONTRACTOR ________________________________________________________________

SALES OFFICE ___________________________________________________________________________

START-UP PERFORMED BY ________________________________________________________________

Design Information

SUPPLY AIR

RETURN AIR

COIL SIZE

(sq ft)

COIL

CIRCUITING

CAPACITY

OAT

CFM

TEMPERATURE TEMPERATURE

ELEVATION DELTA

BETWEEN

INDOOR/OUTDOOR

SUCTION LINE

DIAMETER

LIQUID LINE

DIAMETER

DOUBLE RISER

CONTROL

TYPE (1-9)

LINE LENGTH

(Y/N)

CV/VAV

UNIT MODEL ______________________________ SERIAL ________________________________

II. Preliminary Equipment Check

IS THERE ANY PHYSICAL DAMAGE?

 YES  NO

DESCRIPTION ____________________________________________________________________________

________________________________________________________________________________________

1. UNIT IS INSTALLED LEVEL AS PER THE INSTALLATION INSTRUCTIONS.

2. POWER SUPPLY AGREES WITH THE UNIT NAMEPLATE.

3. ELECTRICAL POWER WIRING IS INSTALLED PROPERLY.

4. UNIT IS PROPERLY GROUNDED.

 YES  NO

5. ELECTRICAL CIRCUIT PROTECTION HAS BEEN SIZED AND INSTALLED PROPERLY.  YES  NO

6. ALL TERMINALS ARE TIGHT.

 YES  NO

7. ALL PLUG ASSEMBLIES ARE TIGHT.

8. ALL CABLES AND THERMISTORS HAVE BEEN INSPECTED FOR CROSSED WIRES.

9. ALL THERMISTORS ARE FULLY INSERTED INTO WELLS.

10. MOTORMASTER IS INSTALLED ON FAN 1.

11. SENSORS (RAT, SAT, SPT) FOR CONTROL TYPES 3, 4, AND 5 ARE INSTALLED.

12. LONG LINE OPTION KIT IS INSTALLED, IF NEED.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53380003-01 Printed in U.S.A. Form 38AP-1T Pg CL-1 210 11-09 Replaces: New

Refrigeration System Check

1. ALL SERVICE VALVES ARE OPEN.

 YES  NO

2. ONLY BLEED TXV(S) ARE INSTALLED.

3. ALL PIPING IS CONNECTED PROPERLY.

4. FILTER DRIERS AND SIGHT GLASSES ARE INSTALLED NEAR THE TXV(S).

5. THE SYSTEM HAS BEEN EVACUATED.

6. THE SYSTEM HAS BEEN CHARGED WITH THE APPROPRIATE INITIAL CHARGE.

7. EVAPORATOR FANS ARE TURNING IN THE CORRECT DIRECTION.

8. EVAPORATOR FAN STATUS SWITCH IS OPERATIONAL.

9. CRANKCASE HEATERS ARE OPERATIONAL AND HAVE BEEN ENERGIZED TO

REMOVE ANY LIQUID FROM THE COMPRESSORS.

 YES  NO

10. WATER HAS BEEN PLACED IN DRAIN PAN TO CONFIRM PROPER DRAINAGE.

11. THE PROPER FILTERS HAVE BEEN INSTALLED.

12. THE FAN AND MOTOR PULLEYS OF THE INDOOR FAN HAVE BEEN CHAECKED

FOR PROPER ALIGNMENT

 YES  NO

13. THE INDOOR FAN BELTS HAVE THE PROPER TENSION.

14. THE CORRECT FAN ROTATION ON BOTH INDOOR AND OUTDOOR UNITS

HAS BEEND VERIFIED.

 YES  NO

15. THE LIQUID SOLENOID VALVES, IF INSTALLED, ARE NEAR THE EVAPORATOR.

16. THE PIPING HAS BEEN CHECKED FOR LEAKS WITH A LEAK DETECTOR.

LOCATE, REPAIR, AND REPORT ANY LEAKS________________________________________________

17. OIL IS VISABLE APPROXIMATELY ¹/₂WAY IN THE SIGHT GLASS(ES)

OF THE COMPRESSOR.

 YES  NO

RECORD THE OIL LEVEL(S) ______________________________________________________________

III. Unit Start-Up

1. COMPRESSOR OIL LEVEL IS CORRECT.

 YES  NO

2. VERIFY COMPRESSOR MOUNTING BOLT TORQUE IS 10-14 FT-LB. (13.5-18.9 N-M).

3. LEAK CHECK UNIT. LOCATE, REPAIR AND REPORT ANY REFRIGERANT LEAKS.

4. VOLTAGE IS WITHIN UNIT NAMEPLATE RANGE.

5. CONTROL TRANSFORMER PRIMARY CONNECTION SET FOR PROPER VOLTAGE.

6. CONTROL TRANSFORMER SECONDARY VOLTAGE =

7. CHECK VOLTAGE IMBALANCE:

AVERAGE VOLTAGE =

A-B

A-C

(A-B + A-C + B-C)/3

B-C

MAXIMUM DEVIATION FROM AVERAGE VOLTAGE =

VOLTAGE IMBALANCE = ____________% (MAX. DEVIATION/AVERAGE VOLTAGE) X 100

VOLTAGE IMBALANCE LESS THAN 2%.

(DO NOT START UNIT IF VOLTAGE IMBALANCE IS GREATER THAN 2%.

CONTACT LOCAL UTILITY FOR ASSISTANCE.)

 YES  NO

8. VERIFY EVAPORATOR FAN CFM.

CL-2

Start and Operate Machine. Complete the Following:

1. COMPLETE COMPONENT TEST.

 YES  NO

2. CHECK REFRIGERANT AND OIL CHARGE.

3. FINISH CHARGING ACCORDING TO THE CHARGING CHART PROVIDED.

4. RECORD COMPRESSOR MOTOR CURRENT.

5. RECORD CONFIGURATION SETTINGS.

6. RECORD OPERATING TEMPERATURES AND PRESSURES.

7. PROVIDE OPERATING INSTRUCTIONS TO OWNER’S PERSONNEL.

Instruction Time ________ hours.

8. RECORD COMPRESSOR OIL LEVELS AFTER INITIAL RUN. ____________________________________

9. OIL LEVELS ARE STILL WITHIN SIGHT GLASS(ES).

 YES  NO

OPERATING DATA:

RECORD THE FOLLOWING INFORMATION FROM THE PRESSURES AND TEMPERATURES MODES WHEN

MACHINE IS IN A STABLE OPERATING CONDITION:

PRESSURE/TEMPERATURE

CIRCUIT A

CIRCUIT B

DISCHARGE PRESSURE

SUCTION PRESSURE

DP.A

DP.B

SP.A

SP.B

SATURATED CONDENSING TEMP

SATURATED SUCTION TEMP

LIQUID LINE TEMPERATURE*

LIQUID LINE PRESSURE

SCT.A

SST.A

SCT.B

SST.B

DISCHARGE LINE TEMPERATURE*

RETURN GAS TEMPERATURE

RETURN AIR TEMPERATURE*

SUPPLY AIR TEMPERATURE*

OUTDOOR-AIR TEMPERATURE

CONTROL POINT

RGT.A

RAT

RGT.B

SAT

OAT

CTPT

CAP.T

PERCENT TOTAL CAPACITY

*Readings taken with a digital thermometer.

CL-3

Compressor Running Current — All readings taken at full load.

COMPRESSOR MOTOR CURRENT

COMPRESSOR A1

COMPRESSOR A2

COMPRESSOR A3

COMPRESSOR B1

COMPRESSOR B2

COMPRESSOR B3

CONDENSER FAN MOTOR CURRENT

FAN MOTOR 1

FAN MOTOR 2

FAN MOTOR 3

FAN MOTOR 4

FAN MOTOR 5

FAN MOTOR 6

EVAPORATOR MOTOR CURRENT

Record Software Versions

MODE — RUN STATUS

SUB-MODE ITEM

DISPLAY

ITEM

EXPANSION

VERS

MBB

MARQ

EMM

NAVI

AUX

CESR-131279- _ _-_ _

CESR-131171- _ _-_ _

CESR-131174- _ _-_ _

CESR-131227- _ _-_ _

CESR-131333- _ _-_ _

CESR-131173- _ _-_ _

CXB

(PRESS ENTER & ESCAPE SIMULTANEOUSLY TO OBTAIN SOFTWARE VERSIONS)

CL-4

COMMENTS:

_________________________________________________________________________________________

SIGNATURES:

START-UP

CUSTOMER

TECHNICIAN ____________________________

REPRESENTATIVE ____________________________

DATE ___________________________________

DATE________________________________________

CL-5

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53380003-01

Printed in U.S.A.

Form 38AP-1T

Pg CL-6

210 11-09

Replaces: New

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