50TC
Single Package Rooftop, 50Hz
Cooling Only
Sizes 07, 08, 09, and 12
with Puronr (R---410A) Refrigerant
Installation Instructions
NOTE: This manual discusses only the mechanical
installation of this unit. Star-up procedures, operating
sequences and service instructions are included in a
separate Service/Maintenance manual which is not
included with this unit. Other manuals may be required
for specific factory-installed options.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agency, or your distributor or branch for
information or assistance. The qualified installer or
agency must use factory-authorized kits or accessories
when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Read through the entire installation instruction manual
before starting the installation, to familiarize yourself with
all steps and to identify additional reference materials
required.
Contact your local Carrier representative for additional
service reference materials.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes for special
requirements. In absence of local codes, it is
recommended that the USA standard ANSI/NFPA 70,
National Electrical Code (NEC), be followed.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Step 1 - Plan for Unit Location . . . . . . . . . . . . . . . . . . 6
Step 2 - Plan for Sequence of Unit Installation . . . . . . 7
Step 3 - Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 4 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 7
Step 5 - Field Fabricate Ductwork . . . . . . . . . . . . . . . 10
Step 6 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . 11
Step 7 - Convert to Horizontal & Connect Ductwork 11
Step 8 - Install Outside Air Hood . . . . . . . . . . . . . . . 11
Step 9 - Install External Condensate Trap and Line . 13
Step 10 - Make Electrical Connections . . . . . . . . . . . 13
Step 11 - Adjust Factory-Installed Options . . . . . . . . 35
Step 12 - Install Accessories . . . . . . . . . . . . . . . . . . . 35
It is important to recognize safety information. This is the
safety-alert symbol
. When you see this symbol on the
unit and in instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
safety-alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or
death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify
unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
Vertical Connections / Economizer
Horizontal Connections / Economizer
C09447
Fig. 1 - Unit Dimensional Drawing – 07 Size Units
3
C09448
Fig. 1 - Unit Dimensional Drawing – 07 Size Unit (cont.)
4
Vertical Connections / Economizer
Horizontal Connections / Economizer
C09450
Fig. 2 - Unit Dimensional Drawing – 08, 09 and 12 Size Units
5
C09451
Fig. 2 - Unit Dimensional Drawing – 08, 09 and 12 Size Units (cont.)
INSTALLATION
Jobsite Survey
457 [18"]1
Complete the following checks before installation.
1067 [42"]
1. Consult local building codes or the U.S.A. National
Electrical Code (Ref: ANSI/NFPA 70, [American
National Standards Institute/National Fire Protection
Association], latest revision) for special installation
requirements.
457 [18"]
1067 [42"]
2. Determine unit location (from project plans) or select
unit location.
1 Required bottom condensate drain connection.
Otherwise, 914mm [36"] for condensate connection.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
C09454
Fig. 3 - Service Clearance Dimensional Drawing
Select a location for the unit and its support system (curb
or other) that provides for the minimum clearances
required for safety. This includes the clearance to
combustible surfaces, unit performance and service access
below, around and above unit as specified in unit
drawings. See Fig. 3.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Select a unit mounting system that provides adequate
height to allow installation of condensate trap per
requirements. Refer to Step 9 — Install External
Condensate Trap and Line – for required trap dimensions.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on
approved roof-covering material when roof curb is used.
Roof mount —
Do not install unit in an indoor location. Do not locate air
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
inlets near exhaust vents or other sources of contaminated
air.
6
Table 1 – Operating Weights
50TC---
Component
Base Unit
UNITS KG (LB)
A07
D08
D09
D12
275 (607)
340.5 (750)
388.2 (855)
392.7 (865)
Economizer
Vertical
36 (80)
36 (80)
36 (80)
36 (80)
Horizontal
Curb
48 (105)
48 (105)
48 (105)
48 (105)
356 mm/14---in
610 mm/24---in
60 (133)
79 (174)
60 (133)
79 (174)
65 (143)
69 (153)
60 (133)
79 (174)
Step 2 — Plan for Sequence of Unit Installation
Step 4 — Provide Unit Support
Roof Curb Mount —
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example,
on curb-mounted units, some accessories must be
installed on the unit before the unit is placed on the curb.
Review the following for recommended sequences for
installation steps.
Accessory roof curb details and dimensions are shown in
Fig. 4 (size 07 units) and Fig. 5 (size 08 – 12 units).
Assemble and install accessory roof curb in accordance
with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install gasket supplied with
the roof curb as shown in Fig. 4 and Fig. 5. Improperly
applied gasket can also result in air leaks and poor unit
performance.
Curb-mounted installation —
Install curb
Install field-fabricated ductwork inside curb
Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are show in
Fig. 6. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru-the-base power
package must be installed before the unit is set on the roof
curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru-the-base service
connections to the basepan in accordance with the
accessory installation instructions.
Pad-mounted installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Slab Mount (Horizontal Units Only) —
Rig and place unit
Provide a level concrete slab that extends a minimum of
150 mm (6 in.) beyond unit cabinet. Install a gravel apron
in front of condenser coil air inlet to prevent grass and
foliage from obstructing airflow.
Convert unit to side duct connection arrangement
Install field-fabricated ductwork at unit duct openings
Install outdoor air hood
NOTE: Horizontal units may be installed on a roof curb
if required.
Install condensate line trap and piping
Make electrical connections
Install other accessories
Alternate Unit Support (In Lieu of Curb or Slab
Mount) —
Frame-mounted installation —
A non-combustible sleeper rail can be used in the unit
curb support area. If sleeper rails cannot be used, support
the long sides of the unit with a minimum of 3 equally
spaced 102 mm x 102 mm (4-in. x 4-in.) pads on each
side.
Frame-mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Step 3 — Inspect unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
7
D ALT
DRAIN
HOLE
CONNECTOR
PKG. ACCY.
ACCESSORY
POWER
ROOFCURB
ACCESSORY
B
C
POWER
3/4” [19] NPT
11/4” [31.7]
CONTROL
A
UNIT SIZE
1’-2”
[356]
CRBTMPWR003A01
CRBTMPWR004A01
CRRFCURB001A01
CRRFCURB002A01
1’-911
[551]
/
16
”
1’-4”
13/4”
[406] [44.5]
1/2” [12.7]
NPT
1/2” [12.7]
NPT
50TC-A07
2’-0”
[610]
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on curb).
6. Service clearance: 4 ft on each side.
7.
Direction of airflow.
C09452
Fig. 4 - Roof Curb Details – 07 Size Units
8
ROOFCURB
ACCESSORY
UNIT SIZE
1’ - 2”
[356]
2’ - 0”
[610]
CRRFCURB003A01
CRRFCURB004A01
50TC-**08 – 12
C09453
Fig. 5 - Roof Curb Details – 08 — 12 Size Units
9
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated and covered with a vapor barrier.
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with
applicable fire codes.
A-B
B-C
A-C
0.5” (13)
1.0” (25)
1.0” (25)
C06110
For units with accessory electric heaters: Horizontal
applications require a minimum clearance to combustible
surfaces of 25 mm (1-in) from duct for first 305 mm (12-in)
away from unit. Vertical applications do not require a
minimum clearance.
Fig. 6 - Unit Leveling Tolerances
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 87 Pa (0.35 in. wg) with economizer or
112 Pa (0.45 in. wg) without economizer.
Minimum clearance is not required around ductwork.
PLACE ALL SEAL STRIP
IN PLACE BEFORE PLACING
UNIT ON ROOF CURB
DETAIL A
914-1371
(36"-54")
“B”
DUCT END
SEE DETAIL “A”
“C”
FA
N
SIDE
“A”
C09458
DIMENSIONS
B
MAX WEIGHT
KG LB
A
C
UNIT
MM
IN
MM
965
IN
MM
850
IN
50TC-A07
50TC-D08
50TC-D09
50TC-D12
336
641
693
711
740
1890
2235
2235
2235
74.5
88.0
88.0
88.0
38.0
41.0
40.5
40.0
33.5
41.5
49.5
49.5
1410
1525
1565
1040
1030
1015
1055
1255
1255
NOTES:
1. Dimensions in ( ) are in inches.
2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the
unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.
Fig. 7 - Rigging Details
10
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used
to move unit across a roof. Level by using unit frame as a
reference. See Table 1 and Fig. 7 for additional information.
Lifting holes are provided in base rails as shown in Fig. 7.
Refer to rigging instructions on unit.
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
C06108
Fig. 8 - Horizontal Conversion Panels
Step 8 — Install Outside Air Hood
Before setting the unit onto the curb, recheck gasketing on
curb.
Economizer Hood Removal and Setup - Factory
Option
Positioning on Curb —
Position unit on roof curb so that the following clearances
are maintained: 6.4 mm (1/4 in.) clearance between the
roof curb and the base rail inside the front and back,
0.0 mm (0.0 in.). clearance between the roof curb and the
base rail inside on the duct end of the unit. This will result
in the distance between the roof curb and the base rail
inside on the condenser end of the unit being
approximately equal to section C-C in Figs. 4 and 5.
1. The hood is shipped in knock-down form and
located in the return air compartment. It is attached
to the economizer using two plastic tie-wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 9.)
3. Locate and cut the (2) plastic tie-wraps, being
careful to not damage any wiring. (See Fig. 10.)
4. Carefully lift the hood assembly through the filter
access opening and assemble per the steps outlined
in Economizer Hood and Two–Position Hood on
page 12.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove rigging skids and
shipping materials.
Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
FILTER ACCESS PANEL
Unit is shipped in the vertical duct configuration. Unit
without factory-installed economizer or return air smoke
detector option may be field-converted to horizontal ducted
configuration. To convert to horizontal configuration,
remove screws from side duct opening covers and remove
covers. Using the same screws, install covers on vertical
duct openings with the insulation-side down. Seals around
duct openings must be tight. See Fig. 8.
Field-supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.
INDOOR COIL ACCESS PANEL
C06023
Fig. 9 - Typical Access Panel Locations
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
11
Economizer Hood and Two-Position Hood—
1. The indoor coil access panel will be used as the top of
the hood. Remove the screws along the sides and bot-
tom of the indoor coil access panel. See Fig. 12.
Remove Hood Parts
Cut Plastic Ties
(2) Places
Economizer
TOP
PANEL
C08633
TOP
PANEL
Fig. 10 - Economizer Parts, Shipping Location
CAULK
HERE
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
Two Position Damper Hood Removal and Setup -
Factory Option
1. The hood is shipped in knock-down form and
assembled to a metal support tray using plastic
stretch wrap. Located in the return air compartment,
the assembly’s metal tray is attached to the basepan
and also attached to the damper using two plastic
tie-wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 9.)
3. Locate the (2) screws holding the metal tray to the
basepan and remove. Locate and cut the (2) plastic
tie-wraps securing the assembly to the damper. (See
Fig. 11.) Be careful to not damage any wiring or cut
tie-wraps securing any wiring.
C06025
Fig. 12 - Indoor Coil Access Panel Relocation
2. Swing out indoor coil access panel and insert the
hood sides under the panel (hood top). Use the screws
provided to attach the hood sides to the hood top. Use
screws provided to attach the hood sides to the unit.
See Fig. 13.
TOP
PANEL
4. Carefully lift the hood assembly (with metal tray)
through the filter access opening and assemble per
the steps outlined in the following procedure
Economizer Hood and Two–Position Hood.
INDOOR COIL
ACCESS PANEL
LEFT
HOOD
SIDE
SCREW
19 1/16”
B
(483mm)
Hood Parts
33 3/8”
(848mm)
HOOD DIVIDER
C06026
Plastic Tie Wrap
Qty (2)
Fig. 13 - Economizer Hood Construction
3. Remove the shipping tape holding the economizer ba-
rometric relief damper in place.
4. Insert the hood divider between the hood sides. See
Fig. 13 and 14. Secure hood divider with 2 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
Screws for Metal Tray
Qty (2)
C08639
Fig. 11 - Two-Position Damper, Shipping Location
12
5. Open the filter clips which are located underneath the
hood top. Insert the aluminum filter into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filter into place. See Fig. 14.
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 16.
MINIMUM PITCH
25 mm (1 in.) PER
3m (10 ft.) OF LINE
BASE RAIL
51 mm
(2 in.)
MIN
OPEN
VENT
TO ROOF
DRAIN
SEE NOTE
DIVIDER
OUTSIDE
AIR
ROOF
CURB
HOOD
DRAIN PLUG
CLEANABLE
ALUMINUM
FILTER
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 102 mm (4 in.) trap is recom. mended
FILTER
C09387
Fig. 16 - Condensate Drain Piping Details
BAROMETRIC
RELIEF
FILTER
CLIP
All units must have an external trap for condensate
drainage. Install a trap at least 102 mm (4-in.) deep and
protect against freeze-up. If drain line is installed
downstream from the external trap, pitch the line away
from the unit at 25 mm in 3 m (1-in. per 10 ft) of run. Do
not use a pipe size smaller than the unit connection of
19 mm (3/4-in.).
C08634
Fig. 14 - Economizer Filter Installation
6. Caulk the ends of the joint between the unit top panel
and the hood top.
7. Replace the filter access panel.
Step 9 — Install External Condensate Trap and
Line
Step 10 — Make Electrical Connections
The unit has one 19 mm (3/4-in.) condensate drain
connection on the end of the condensate pan and an
alternate connection on the bottom. See Fig. 15. Unit
airflow configuration does not determine which drain
connection to use. Either drain connection can be used
with vertical or horizontal applications.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit
cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of
personal injury if an electrical fault should occur. This
ground may consist of electrical wire connected to
unit ground lug in control compartment, or conduit
approved for electrical ground when installed in
accordance with local electrical codes or in absence
of local codes, it is recommended that the U.S.A.
standard ANSI/NFPA 70, National Electrical Code
(NEC), be followed.
When using the standard side drain connection, ensure the
red plug in the alternate bottom connection is tight. Do
this before setting the unit in place. The red drain pan can
be tightened with a 12.7 mm (1/2 -in.) square socket drive
extension.
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a 12 mm
[1/2 -in.] square socket drive extension) and install it in the
side drain connection.
NOTE: Check all factory and field electrical connections
for tightness. Field-supplied wiring shall conform with
the limitations of 33_C (63_F) rise.
Field power wires are connected to the unit at line-side
pressure lugs on compressor contactor C and indoor fan
contactor IFC (see wiring diagram label for control box
component arrangement) or at factory-installed option
non-fused disconnect switch. Use copper conductors only.
CONDENSATE PAN (SIDE VIEW)
ALTERNATE
BOTTOM DRAIN
STANDARD
SIDE DRAIN
DRAIN PLUG
NOTE: Make field power connections directly to line
(FACTORY-INSTALLED)
connection pressure lugs only.
C08021
Fig. 15 - Condensate Drain Pan (Side View)
13
The unit is factory wired for the voltage shown on ;the
nameplate. Refer to the unit label diagram for additional
information.
Units Without Disconnect Option
C
IFC
11
13
13
!
WARNING
Disconnect
L2
FIRE HAZARD
Failure to follow this warning could result in
intermittent operation or performance satisfaction.
L1
L3
Do not connect aluminum wire between disconnect
switch and air conditioning unit.. Use only copper
wire. (See Fig. 17.)
Units With Disconnect Option
Factory
Wiring
3
5
1
Optional
Disconnect
Switch
ELECTRIC
DISCONNECT
SWITCH
2
4
6
COPPER
WIRE ONLY
L1
L2
L3
Disconnect factory test leads; discard.
ALUMINUM
WIRE
C09411
Fig. 18 - Power Wiring Connections
A93033
Fig. 17 - Disconnect Switch and Unit
Table 2 – American/European Wire Conversions
AMERICAN
American
EUROPEAN
European
Units Without Factory-Installed Disconnect —
Industry
2
2
When installing units, provide a disconnect switch of
adequate size per local or national wiring code.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
Standard Size Conversion (mm ) Standard Size (mm )
20 AWG
18 AWG
16 AWG
14 AWG
0.52
0.82
1.30
2.08
0.5
1.0
1.5
2.5
Units with Factory-Installed Disconnect —
Thru-Base Connections —
This service connection kit consists of a 12.7 mm (1/2 - i n )
electrical bulkhead connector and a 31.75 mm (11/4 - i n )
electrical bulkhead connector, all factory-installed in the
embossed (raised) section of the unit basepan in the
condenser section. The 12.7 mm (1/2 -in) bulkhead
connector enables the low-voltage control wires to pass
through the basepan. The 31.75 mm (11/4 -in) electrical
bulkhead connector allows the high-voltage power wires
to pass through the basepan. See Fig. 19.
The factory-installed option disconnect switch is located
in a weatherproof enclosure located under the main
control box. The manual switch handle is accessible
through an opening in the access panel.
All units -
All field wiring must comply with all local codes. Size wire
based on MCA (Minimum Circuit Amps) on the unit
informative plate. See Fig. 18 for power wiring connections
to the unit power terminal block and equipment ground.
Provide a ground-fault and short-circuit over-current
protection device (fuse or breaker) per local code (or
U.S.A. NEC Article 440). Refer to unit informative data
plate for MOCP (Maximum Over-current Protection)
device size.
LOW VOLTAGE
CONDUIT
CONNECTOR
All field wiring must comply with the appropriate national
electrical codes and local requirements.
HIGH VOLTAGE
CONDUIT
CONNECTOR
C08637
Fig. 19 - Thru-Base Connection Fittings
14
Check tightness of connector lock nuts before connecting
electrical conduits.
installation instructions for additional features which
might require additional conductors in the cable.
Field-supplied and field-installed liquidtight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped)
or to the external disconnect (through unit side panel). A
hole must be field cut in the main control box bottom on
the left side so the 24-v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.
For wire runs up to 15 m (50 ft.), use no. 18 AWG
(American Wire Gage) insulated wire (35_C minimum).
For 15 to 23 m (50 to 75 ft.), use no. 16 AWG insulated
wire (35_C minimum). For over 23 m (75 ft.), use no. 14
AWG insulated wire (35_C minimum). All wire sizes
larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice
at the thermostat.
Central
Terminal
Board
Units without Thru-Base Connections —
Typical
Thermostat
Connections
1. Install power wiring conduit through side panel open-
ings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 18.
X
C
X
C
G
C
G
All Units —
G
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On
3-phase units, voltages between phases must be balanced
within 2% and the current within 10%. Use the following
formula to determine the percent of voltage imbalance.
W2
W2
W2
(Note 3)
(Note 2)
W1
Y2
Y1
R
W1
W1
O/B/Y2
(Note 1)
Y2
max voltage deviation from average voltage
% Voltage Imbalance = 100 x
average voltage
Y1
R
Y1
R
C09103
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate
any applicable Carrier warranty.
T–STAT
Note 1: Typical multi-function marking. Follow manufacturer’s configuration
instructions to select Y2.
Note 2: Y2 to Y2 connection required on single-stage cooling units when
integrated economizer function is desired
Field Control Wiring —
The 50TC unit requires an external temperature control
device. This device can be a thermostat (field-supplied)
or a PremierLink controller (available as factory-installed
option or as field-installed accessory, for use on a Carrier
Comfort Network or as a stand alone control) or the
RTU-MP Controller for Building Management Systems
using non-CCN protocols (RTU-MP is available as a
factory-installed option only).
Note 3: W2 connection not required on units with single-stage heating.
Field Wiring
C09459
Fig. 20 - Typical Low-Voltage Control Connections
Unit without thru-base connection kit —
Pass the thermostat control wires through the hole
provided in the end panel (see item “D” in the view
labeled “LEFT” in Fig. 1 and Fig. 2); then feed the wires
through the raceway built into the corner post to the
control box. Pull the wires over to the terminal strip on the
upper-left corner of the Central Terminal Board. (CTB)
See Fig. 21.
Thermostat —
Install a Carrier-approved accessory thermostat according to
installation instructions included with the accessory. For
complete economizer function, select a two-stage cooling
thermostat. Locate the thermostat accessory on a solid wall
in the conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
NOTE: If thru-the-bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
If the thermostat contains a logic circuit requiring 24-v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24-v source (no “C”
connection required), use a thermostat cable or equivalent
with minimum of six leads. Check the thermostat
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second-stage heating, when available.
15
Table 3 – Heater Model Number
Bare Heater Model Number
C
C
R
H
E
A
T
E
R
R
0
1
1
1
6
6
A
A
0
0
0
0
Heater Sales Package PNO
Includes:
Bare Heater
R
H
E
A
T
E
Carton and packing materials
Installation sheet
DISCONNECT MOUNTING
LOCATION
Electric Heaters
50TC units may be equipped with field-installed
accessory electric heaters. Each heater is a pre-assembled
module, with heater frames holding open coil resistance
wires strung through ceramic insulators, line-break limit
switches and two control contactors for two-stage heating
control.
The heater module is installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
compartment on tracks along the bottom of the heater
opening. See Fig. 22, Fig. 23 and Fig. 24. Refer to the
Electric Heater Kit Installation Instructions for complete
details.
INDOOR
ACCESS
PANEL
UNIT BLOCK-OFF
PANEL
OUTDOOR
ACCESS PANEL
C08133
Not all available heater modules may be used in every
unit. Use only those heater modules that are Carrier
approved for use in a specific size. Refer to the label on
the unit cabinet for the list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marked with
a corresponding heater Sales Package part number. See
Table 3 for correlation between heater Model Number and
Sales Package part number.
Fig. 22 - Typical Access Panel Location (3-6 Ton)
DISCONNECT EMT OR RIGID CONDUIT SINGLE
CENTER MANUAL RESET
MOUNTING
LOCATION
(FIELD-SUPPLIED)
POINT BOX POST
LIMIT SWITCH
HEATER
COVERS
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1) and a
bare heater model number (value is 0).
SINGLE POINT
RACEWAY
MAIN
BRACKET AND BOX
HEATER
MODULE
HEATER
MODULE
HEATER
CONTROL CONDUIT
MOUNTING
SCREW
MOUNTING
BOX
DRIP BOOT
(LOCATION 1) (LOCATION 2) BRACKET
CONTROL WIRE TERMINAL BLOCK
C08134
Fig. 23 - Typical Component Location
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 21 - Field Control Wiring Raceway
16
CONTROL
BOX
2
1
1
1
2
1
3
3
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
TRACK
POWER
WIRES
2 3
2 1
1 3
1 1
FOAM
BUSHING
LLIED
PA
CORP
.
MDEL
NO.
OD
EAL NO.
FLANGE
22.2
IED AIR
NTIONING
UACCESS
1
3
23
2-
46N
.
P
/
N
5610-4
REV
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
C08136
C08135
Fig. 25 - Typical Single Point Installation
Fig. 24 - Typical Module Installation
Low-Voltage Control Connections Pull the
—
Single Point Boxes and Supplementary Fuses — When
the unit MOCP device value exceeds 60-A, unit-mounted
supplementary fuses are required for each heater circuit.
These fuses are included in accessory Single Point Boxes,
with power distribution and fuse blocks. The single point
box will be installed directly under the unit control box,
just to the left of the partition separating the indoor
section (with electric heaters) from the outdoor section.
The Single Point Box has a hinged access cover. See
Fig. 25. The Single Point Box also includes a set of
power taps to complete the wiring between the Single
Point Box and the unit’s main control box terminals. Refer
to the accessory heater and Single Point Box installation
instructions for details on tap connections.
low-voltage control leads from the heater module(s) -
VIO and BRN (two of each if two modules are installed;
identify for Module #1) - to the 4-pole terminal board
TB4 located on the heater bulkhead to the left of Heater
#1. Connect the VIO lead from Heater #1 to terminal
TB4-1. For 2 stage heating, connect the VIO lead from
Heater #2 to terminal TB4-2. For 1 stage heating with 2
heater modules connect the VIO lead from both Heater #1
and #2 to terminal TB4-1. Connect both BRN leads to
terminal TB4-3. See Fig. 26.
CTB
CONTL
BOARD
All fuses on 50TC units are 60-A. (Note that all heaters
are qualified for use with a 60-A fuse, regardless of actual
heater ampacity, so only 60-A fuses are necessary.)
2
VIO
ORN
BRN
Single Point Boxes without Fuses — Unit heater
applications not requiring supplemental fuses require a
special Single Point Box without any fuses. The accessory
Single Point Boxes contain a set of power taps to
complete the wiring between the Single Point Box and the
unit’s main control box terminals. Refer to accessory
heater and Single Point Box installation instructions for
details on tap connections.
3
12
ORN
1
VIO
2
BRN
3
Plug
Assembly
Field
Connections
VIO
VIO
BRN BRN
Elec Htr
VIO
HR2
HR1
BRN
BRN
VIO
HR1: Heater contactor, first-stage
HR2: Heater contactor, second-stage
C09390
Fig. 26 - Accessory Electric Heater Control
Connections
17
PremierLinkt (Factory--Option) —
C08199
Fig. 27 - PremierLink Controller
The PremierLink controller (see Fig. 27) is compatible
with Carrier Comfort Networkr (CCN) devices. This
control is designed to allow users the access and ability to
change factory-defined settings, thus expanding the
function of the standard unit control board. CCN service
access tools include System Pilot (TM), Touch Pilot (TM)
and Service Tool. (Standard tier display tools Navigatort
and Scrolling Marquee are not suitable for use with latest
PremierLink controller (Version 2.x).)
The SAT is factory-wired. The SAT probe is wire-tied to
the supply-air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re-position the sensor in the flange of the supply-air
opening or in the supply air duct (as required by local
codes). Drill or punch a 12.7 mm (1/2 -in.) hole in the
flange or duct. Use two field-supplied, self-drilling
screws to secure the sensor probe in a horizontal
orientation. See Fig. 28.
The PremierLink control is factory-mounted in the 50TC
unit’s main control box to the left of the Central Terminal
Board (CTB). Factory wiring is completed through
harnesses connected to the CTB pin connectors. Field
connections are made at a 16-pole terminal block (TB1)
located on the bottom shelf of the unit control box in front
of the PremierLink controller. The factory-installed
PremierLink control includes the supply-air temperature
(SAT) sensor. The outdoor air temperature (OAT) sensor is
included in the FIOP/accessory EconoMi$ert2 package.
ROOF
CURB
SUPPLY AIR
TEMPERATURE
SENSOR
The PremierLink controller requires the use of a Carrier
electronic thermostat or a CCN connection for time
broadcast to initiate its internal timeclock. This is
necessary for broadcast of time of day functions
(occupied/unoccupied).
SUPPLY AIR
RETURN AIR
C09059
NOTE: PremierLink controller is shipped in Sensor
mode. To be used with a thermostat, the PremierLink
controller must be configured to Thermostat mode. Refer
to PremierLink Configuration instructions for Operating
Mode.
Fig. 28 - Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
NOTE:
Refer to Form 33CS-58SI for complete
PremierLink configuration, operating sequences and
troubleshooting information. Have a copy of this manual
available at unit start-up.
NOTE: The sensor must be mounted in the discharge
airstream downstream of the cooling coil and any heating
devices. Be sure the probe tip does not come in contact
with any of the unit’s heater surfaces.
Supply Air Temperature (SAT) Sensor
—
On
FIOP-equipped 50TC unit, the unit is supplied with a
supply-air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 152 mm
(6-inches) in length. It is a nominal 10-k ohm thermistor.
18
C09460
Fig. 29 - PremierLink Wiring Schematic
19
Outdoor Air Temperature (OAT) Sensor — The OAT is
factory-mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to
an eyelet mounting ring.
block (TB1) located on the control box bottom shelf in
front of the PremierLink control (See Fig. 29). Some input
devices also require a 24-vac signal source; connect at
CTB terminal R at “THERMOSTAT” connection strip for
this signal source. See connections figures on following
pages for field connection locations (and for continued
connections at the PremierLink board inputs).
EconoMi$er2 — The PremierLink control is used with
EconoMi$er2 (option or accessory) for outdoor air
management. The damper position is controlled directly
by the PremierLink control; EconoMi$er2 has no internal
logic device.
Table 5 provides a summary of field connections for units
equipped with Space Sensor. Table 6 provides a summary
of field connections for units equipped with Space
Thermostat.
Outdoor air management functions can be enhanced with
field-installation of these accessory control devices:
Space Sensors
-
The PremierLink controller is
Enthalpy control (outdoor air or differential sensors)
Space CO2 sensor
Outdoor air CO2 sensor
factory-shipped configured for Space Sensor Mode. A
Carrier T-55 or T-56 space sensor must be used. T-55
space temperature sensor provides a signal of space
temperature to the PremierLink control. T-56 provides
same space temperature signal plus it allows for
adjustment of space temperature setpoints from the face of
the sensor by the occupants.
Refer to Table 4 for accessory part numbers.
Field connections — Field connections for accessory
sensor and input devices are made at the 16-pole terminal
Table 4 – PremierLink Sensor Usage
OUTDOOR AIR
TEMPERATURE
SENSOR
RETURN AIR
TEMPERATURE
SENSOR
OUTDOOR AIR
ENTHALPY SENSOR
RETURN AIR
ENTHALPY SENSOR
APPLICATION
Differential Dry Bulb
Temperature with
PremierLink
(PremierLink requires
4 --- 20 mA Actuator)
Required ---
33ZCT55SPT
or equivalent
Included ---
---
---
---
CRTEMPSN001A00
Single Enthalpy with
PremierLink
(PremierLink requires
4 --- 20mA Actuator)
Requires ---
HH57AC077
or equivalent
Included ---
Not Used
---
---
Differential Enthalpy
with PremierLink
(PremierLink requires
4 --- 20mA Actuator)
Requires ---
HH57AC077
or equivalent
Requires ---
HH57AC078
or equivalent
Included ---
Not Used
NOTES:
CO Sensors (Optional):
2
33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 --- Aspirator box used for duct---mounted CO room sensor.
2
33ZCT55CO2 --- Space temperature and CO room sensor with override.
2
33ZCT56CO2 --- Space temperature and CO room sensor with override and setpoint.
2
20
Table 5 – Space Sensor Mode
TB1 TERMINAL
FIELD CONNECTION
T55 --- SEN/T56 --- SEN
RMTOCC
INPUT SIGNAL
Analog (10k thermistor)
Discrete, 24VAC
Analog (10k thermistor)
Discrete, 24VAC
Analog (10k thermistor)
Discrete, 24VAC
Analog, 24VDC
1
2
3
T55 --- SEN/T56 --- SEN
CMPSAFE
4
5
T56---SET
6
FSD
7
LOOP---PWR
8
SPS
Discrete, 24VAC
Analog, 4 --- 20mA
Discrete, 24VAC
Analog, 4 --- 20mA
Digital, , 5VDC
9
IAQ---SEN
10
11
12
13
14
15
16
FILTER
IAQ --- COM/OAQ --- COM/RH --- COM
CCN + (RED)
OAQ---SEN/RH---SEN
CCN Gnd (WHT)
Analog, 4 --- 20mA
Digital, 5VDC
CCN --- (BLK)
Digital, 5VDC
LEGEND:
T 55
T 56
CCN
C MP SAFE
FILT ER
--- Sp ace Temp eratu re Sen sor
FSD --- Fire Sh u td own
IAQ --- In d oor Air Q u ality (C O )
OAQ --- Outdoor Air Quality (CO )
2
RH --- Relative Hu mid ity
SFS --- Su p p ly Fan Statu s
--- Sp ace Temp eratu re Sen sor
--- Carrier Comfort Network (communication bus)
--- C omp ressor Saf ety
2
--- Dirty Filter Switch
Table 6 – Thermostat Mode
TB1 TERMINAL
FIELD CONNECTION
INPUT SIGNAL
Analog (10k thermistor)
Discrete, 24VAC
1
2
RAT SEN
G
3
RAT SEN
Y1
Analog (10k thermistor)
Discrete, 24VAC
4
5
6
Y2
LOOP---PWR
Discrete, 24VAC
Analog, 24VDC
Discrete, 24VAC
Analog, 4---20mA
Discrete, 24VAC
Analog, 4---20mA
Digital, 5VDC
7
8
W1
9
IAQ --- SEN
10
11
12
13
14
15
16
W2
IAQ --- COM/OAQ --- COM/RH --- COM
CCN + (RED)
OAQ --- SEN/RH --- SEN
CCN Gnd (WHT)
Analog, 4---20mA
Digital, 5VDC
CCN --- (BLK)
Digital, 5VDC
LEGEND:
CCN
G
IAQ
OAQ
RAT
---
---
---
---
---
Carrier Comfort Network (communication bus)
Thermostat Fan
RH --- Relative Humidity
W1 --- Thermostat Heat Stage 1
W2 --- Thermostat Heat Stage 2
Y1 --- Thermostat Cool Stage 1
Y2 --- Thermostat Cool Stage 2
Indoor Air Quality (CO )
2
Outdoor Air Quality (CO )
2
Return Air Temperature
21
TB1
1
PL
SEN
SEN
J6-7
PL
TB1
3
J6-6
1
2
4
5
6
3
RED(+)
Jumper
WHT(GND)
CCN COM
BLK(-)
SET
SET
SEN
SW1
J6-5
5
BRN (GND)
BLU (SPT)
SENSOR WIRING
C08213
Fig. 33 - PremierLink T-56 Sensor
Connect Thermostat — A 7-wire thermostat connection
requires a 24-v power source and a common connection.
Use the R and C terminals on the CTB’s THERMOSTAT
connection strip for these. Connect the thermostat’s Y1,
Y2, W1, W2 and G terminals to PremierLink TB1 as
shown in Fig. 34.
C08201
Fig. 30 - T-55 Space Temperature Sensor Wiring
If the 50TC unit is equipped with factory-installed smoke
detector(s), disconnect the factory BLU lead at TB1-6
(Y2) before connecting the thermostat. Identify the BLU
lead originating at CTB-DDC-1; disconnect at TB1-6
and tape off. Confirm that the second BLU lead at TB1-6
remains connected to PremierLink J4-8.
Connect T-55 - See Fig. 30 for typical T-55 internal
connections. Connect the T-55 SEN terminals to TB1
terminals 1 and 3 (see Fig. 31).
TB1
1
PL
CTB
SPACE
SEN
SEN
J6-7
THERMOSTAT
THERMOSTAT
J6-6
3
R
TB1
2
R
C08212
Fig. 31 - PremierLink T-55 Sensor
PL
J4-12
G
Y1
Y2
W1
W2
C
Connect T-56
-
See Fig. 32 for T-56 internal
J4-10
J4-8
J4-6
J4-4
4
6
connections. Install a jumper between SEN and SET
terminals as illustrated. Connect T-56 terminals to TB1
terminals 1, 3 and 5 (see Fig. 33).
8
10
C
CTB
THERMOSTAT
C08119
1
2
4
5
6
3
RED(+)
WHT(GND)
Fig. 34 - Space Thermostat Connections
CCN COM
BLK(-)
SET
SEN
If the 50TC unit has an economizer system and
free-cooling operation is required, a sensor representing
Return Air Temperature must also be connected
(field-supplied and installed). This sensor may be a T-55
Space Sensor (see Fig. 29) installed in the space or in the
return duct, or it may be sensor PNO 33ZCSENSAT,
installed in the return duct. Connect this sensor to TB1-1
and TB1-3 per Fig. 31.
SW1
BLK
(T56)
BRN (GND)
BLU (SPT)
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
Cool
Warm
Configure the unit for Thermostat Mode — Connect to the
CCN bus using a CCN service tool and navigate to
PremierLink Configuration screen for Operating Mode.
Default setting is Sensor Mode (value 1). Change the
value to 0 to reconfigure the controller for Thermostat
Mode.
C08202
Fig. 32 - T-56 Internal Connections
22
ENTHALPY CONTROLLER
When the PremierLink is configured for Thermostat
Mode, these functions are not available: Fire Shutdown
(FSD), Remote Occupied (RMTOCC), Compressor Safety
(CMPSAFE), Supply Fan Status (SFS), and Filter Pressure
Switch (FILTER).
(OUTDOOR
AIR
S
+
RED
BRN
ENTHALPY
SENSOR)
B
TR
SO
TR1
BLK
RED
C
D
A
+
S
+
(RETURN AIR
ENTHALPY
SENSOR)
+
3
1
SR
2
GRAY/ORN
GRAY/RED
WIRE HARNESS
IN UNIT
Economizer controls —
LED
Outdoor Air Enthalpy Control (PNO HH57AC077) -
NOTES:
1. Remove factory-installed jumper across SR and + before connecting
The enthalpy control (HH57AC077) is available as a
field-installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field-installed
accessory return air enthalpy sensor (HH57AC078) is
required for differential enthalpy control. See Fig. 35.)
wires from return air sensor.
2. Switches shown in high outdoor air enthalpy state. Terminals 2 and 3
close on low outdoor air enthalpy relative to indoor air enthalpy.
3. Remove sensor mounted on back of control and locate in outside airstream.
C06019
Fig. 36 - Outside and Return Air Enthalpy Sensor
Wiring
Locate the enthalpy control in the economizer hood.
Locate two GRA leads in the factory harness and connect
these leads to enthalpy control sensors 2 and 3. See
Fig. 35. Connect the enthalpy control power input
terminals to economizer actuator power leads RED
(connect to TR) and BLK (connect to TR1).
To wire the return air enthalpy sensor, perform the
following:
1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the enthal-
py controller.
2. At the enthalpy control remove the factory-installed
resistor from the (SR) and (+) terminals.
CTB
ECON
Enthalpy
Switch
3. Connect the field-supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(SR+) terminal on the enthalpy controller. Connect
the BLK wire to (S) spade connector on the return air
enthalpy sensor and the (SR) terminal on the enthalpy
controller.
2
3
6
7
GRA
GRA
NOTE: The enthalpy control must be set to the “D”
setting for differential enthalpy control to work properly.
Indoor Air Quality (CO2 sensor) — The indoor air quality
sensor accessory monitors space carbon dioxide (CO2)
levels. This information is used to monitor IAQ levels.
Several types of sensors are available, for wall mounting
in the space or in return duct, with and without LCD
display, and in combination with space temperature
sensors. Sensors use infrared technology to measure the
levels of CO2 present in the space air.
Factory Wiring Harness
C08218
Fig. 35 - Enthalpy Switch (HH57AC077) Connections
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
Differential Enthalpy Control — Differential enthalpy
control is provided by sensing and comparing the outside
air and return air enthalpy conditions. Install the outdoor
air enthalpy control as described above. Add and install a
return air enthalpy sensor.
The CO2 sensors are all factory set for a range of 0 to
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO2 sensor for electrical
requirements and terminal locations. See Fig. 37 for
typical CO2 sensor wiring schematic.
Return Air Enthalpy Sensor — Mount the return-air
enthalpy sensor (HH57AC078) in the return-air duct. The
return air sensor is wired to the enthalpy controller
(HH57AC077). See Fig. 36.
23
Refer to Form 33CS-58SI, PremierLink Installation,
Start-up, and Configuration Instructions, for detailed
configuration information
Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
weatherproof enclosure) — The outdoor air CO2 sensor is
designed to monitor carbon dioxide (CO2) levels in the
outside ventilation air and interface with the ventilation
damper in an HVAC system. The OAQ sensor is packaged
with an outdoor cover. See Fig. 39. The outdoor air CO2
sensor must be located in the economizer outside air hood.
+ 0-10VDC
-
SIG COM
4-20mA
+
ALARM
NC
COM RELAY
}
NO CONTACTS
24 VAC
OR
24 VDC
H G
+
-
2 1
J3
5 4 3 2 1
8 7 6
J4
C08635
Fig. 37 - Indoor/Outdoor Air Quality (CO2) Sensor
(33ZCSENCO2) - Typical Wiring Diagram
To accurately monitor the quality of the air in the
conditioned air space, locate the sensor near a return-air
grille (if present) so it senses the concentration of CO2
leaving the space. The sensor should be mounted in a
location to avoid direct breath contact.
COVER REMOVED
SIDE VIEW
C07135
Fig. 39 - Outdoor Air Quality Sensor Cover
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources.
Allow at least 0.9 m (3 ft) between the sensor and any
corner. Avoid mounting the sensor where it is influenced
by the supply air; the sensor gives inaccurate readings if
the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air
before it is drawn into the return airstream.
Wiring the Outdoor Air CO2 Sensor — A dedicated power
supply is required for this sensor. A two-wire cable is
required to wire the dedicated power supply for the sensor.
The two wires should be connected to the power supply
and terminals 1 and 2.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
OAQ sensor. See Fig. 37. Connect the 4 to 20 mA
terminal to the TB1-13 terminal of the 50TC. Connect the
SIG COM terminal to the TB1-11 terminal of the 50TC.
See Fig. 40.
Wiring the Indoor Air Quality Sensor —
For each sensor, use two 2-conductor 18 AWG (American
Wire Gage) twisted-pair cables (unshielded) to connect
the separate isolated 24 vac power source to the sensor
and to connect the sensor to the control board terminals.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 37. Connect the 4-20 mA terminal to
terminal TB1-9 and connect the SIG COM terminal to
terminal TB1-11. See Fig. 38.
OAQ Sensor/RH Sensor
TB1
13
PL
J5-2
SEN
TB1
11
COM
J5-3
24 VAC
C08275
IAQ Sensor
Fig. 40 - Outdoor CO2 Sensor Connections
TB1
9
PL
J5-5
SEN
TB1
11
Fire Shutdown (FSD) — This function is available only
when PremierLink is configured for (Space) Sensor Mode.
The unit is factory-wired for PremierLink FSD operation
when PremierLink is factory-installed.
COM
J5-3
24 VAC
C08636
Fig. 38 - Indoor CO2 Sensor (33ZCSENCO2)
Connections
Filter Status Switch — This function is available only
when PremierLink is configured for (Space) Sensor Mode.
24
PremierLink control can monitor return filter status in two
ways: By monitoring a field-supplied/installed filter
pressure switch or via supply fan runtime hours.
Occupied mode. This function may also provide a “Door
Switch” time delay function that will terminate cooling
and heating functions after a 2-20 minute delay.
Using switch input: Install the dirty filter pressure switch
according to switch manufacturer’s instructions, to
measure pressure drop across the unit’s return filters.
Connect one side of the switch’s NO contact set to CTB’s
THERMOSTAT-R terminal. Connect the other side of the
NO contact set to TB1-10. Setpoint for Dirty Filter is set
at the switch. See Fig. 41.
Connect one side of the NO contact set on the timeclock
to CTB’s THERMOSTAT-R terminal. Connect the other
side of the timeclock contact to the unit’s TB1-2 terminal.
CTB
Remote Occupied
Thermostat
R
Time Clock
TB1
2
PL
J4-12
Filter Switch (NO, close on rising pressure (high drop))
C08214
CTB
Thermostat
Fig. 43 - PremierLink Wiring Remote Occupied
R
Refer to Form 33CS-58SI for additional information on
configuring the PremierLink control for Door Switch
timer function.
TB1
10
PL
J4-4
C08216
Space Relative Humidity Sensor — The RH sensor is not
used with these 50Hz 50TC models at this time.
Fig. 41 - PremierLink Filter Switch Connection
CCN Communication Bus — The PremierLink controller
connects to the bus in a daisy chain arrangement.
Negative pins on each component must be connected to
respective negative pins, and likewise, positive pins on
each component must be connected to respective positive
pins. The controller signal pins must be wired to the signal
ground pins. Wiring connections for CCN must be made
at the 3-pin plug.
When the filter switch’s NO contact set closes as filter
pressure drop increases (indicating dirt-laden filters), the
input signal to PremierLink causes the filter status point to
read “DIRTY”.
Using Filter Timer Hours: Refer to Form 33CS-58SI for
instructions on using the PremierLink Configuration
screens and on unit alarm sequence.
At any baud (9600, 19200, 38400 baud), the number of
controllers is limited to 239 devices maximum. Bus length
may not exceed 1219 m (4000 ft), with no more than 60
total devices on any 305 m (1000-ft) section. Optically
isolated RS-485 repeaters are required every 305 m
(1000 ft).
Supply Fan Status Switch — The PremierLink control can
monitor
supply
fan
operation
through
a
field-supplied/installed differential pressure switch. This
sequence will prevent (or interrupt) operation of unit
cooling, heating and economizer functions until the
pressure switch contacts are closed indicating proper
supply fan operation.
NOTE: Carrier device default is 9600 band.
Install the differential pressure switch in the supply fan
section according to switch manufacturer’s instructions.
Arrange the switch contact to be open on no flow and to
close as pressure rises indicating fan operation.
COMMUNICATION BUS WIRE SPECIFICATIONS —
The CCN Communication Bus wiring is field-supplied
and field-installed. It consists of shielded 3-conductor
cable with drain (ground) wire. The cable selected must
be identical to the CCN Communication Bus wire used for
the entire network.
Connect one side of the switch’s NO contact set to CTB’s
THERMOSTAT-R terminal. Connect the other side of the
NO contact set to TB1-8. Setpoint for Supply Fan Status
is set at the switch. See Fig. 42.
See Table 7 for recommended cable.
Table 7 – Recommended Cables
Fan (Pressure) Switch (NO, close on rise in pressure)
CTB
MANUFACTURER
Alpha
CABLE PART NO.
2413 or 5463
A22503
Thermostat
R
American
Belden
PL
J4-6
TB1
8
8772
Columbia
02525
C08118
Fig. 42 - PremierLink Wiring Fan Pressure Switch
Connection
Remote Occupied Switch — The PremierLink control
permits a remote timeclock to override the control’s
on-board occupancy schedule and place the unit into
25
NOTE: Conductors and drain wire must be at least 20
AWG, stranded, and tinned copper. Individual conductors
must be insulated with PVC, PVC/nylon, vinyl, Teflon, or
polyethylene. An aluminum/polyester 100% foil shield
and an outer jacket of PVC, PVC/nylon, chrome vinyl, or
Teflon with a minimum operating temperature range of
- 2 0 _C to 60_C (-4_F to 140_F) is required. Do not run
communication wire in the same conduit as or next to any
AC voltage wiring.
Table 8 – Color Code Recommendations
CCN BUS WIRE
COLOR
CCN PLUG PIN
SIGNAL TYPE
NUMBER
+
Ground
---
Red
White
Black
1
2
3
Connect the CCN (+) lead (typically RED) to the unit’s
TB1-12 terminal. Connect the CCN (ground) lead
(typically WHT) to the unit’s TB1-14 terminal. Connect
the CCN (-) lead (typically BLK) to the unit’s TB1-16
terminal. See Fig. 44.
The communication bus shields must be tied together at
each system element. If the communication bus is entirely
within one building, the resulting continuous shield must
be connected to ground at only one single point. If the
communication bus cable exits from one building and
enters another building, the shields must be connected to
the grounds at a lightning suppressor in each building (one
point only).
CCN Bus
TB1
12
PL
J2-1
+ (RED)
Connecting CCN bus:
TB1
14
NOTE: When connecting the communication bus cable,
GND (WHT)
J2-2
a
color code system for the entire network is
recommended to simplify installation and checkout. See
Table 8 for the recommended color code.
TB1
16
– (BLK)
J2-3
C08276
Fig. 44 - PremierLink CCN Bus Connections
26
The RTU-MP control is factory-mounted in the 50TC
unit’s main control box, to the left of the CTB. See
Fig. 46. Factory wiring is completed through harnesses
connected to the CTB. Field connections for RTU-MP
sensors will be made at the Phoenix connectors on the
RTU-MP board. The factory-installed RTU-MP control
includes the supply-air temperature (SAT) sensor. The
outdoor air temperature (OAT) sensor is included in the
FIOP/accessory EconoMi$er2 package.
RTU--MP control system
The RTU-MP controller, see Fig. 45, provides expanded
stand-alone operation of the HVAC system plus
connection and control through communication with
several Building Automation Systems (BAS) through
popular third-party network systems. The available
network systems are BACnet MP/TP, Modbus and
Johnson J2. Communication with LonWorks is also
possible by adding an accessory interface card to the
RTU-MP. Selection of the communication protocol and
baud rate are made at on-board DIP switches.
Refer to Table 9, RTU-MP Controller Inputs and Outputs
for locations of all connections to the RTU-MP board.
C07129
Fig. 45 - RTU-MP Multi-Protocol Control Board
CTB
RTU-MP Board
C08585
Fig. 46 - 50TC Control Box Component Locations
27
C09461
Fig. 47 - RTU-MP System Control Wiring Diagram
28
Table 9 – RTU-MP Controller Inputs and Outputs
BACnet OBJECT
TYPE OF I/O
NAME
CONNECTION PIN
NUMBERS
POINT NAME
INPUTS
Space Temperature Sensor
Supply Air Temperature
Local Outside Air Temperature Sensor
Space Temperature Offset Pot
Indoor Air Quality
Outdoor Air Quality
Safety Chain Feedback
Compressor Safety
sptsens
sat
oatsens
sptopot
iaq
oaq
safety
compstat
firedown
enthalpy
humstat
AI (10K Thermistor)
AI (10K Thermistor)
AI (10K Thermistor)
AI (100K Potentiometer)
AI (4 --- 20 ma)
J20 --- 1, 2
J2---1, 2
J2---3, 4
J20 --- 3
J4---2, 3
J4---5, 6
J1---9
AI (4 --- 20 ma)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
J1---2
Fire Shutdown
Enthalpy Switch
Humidistat Input Status
J1 --- 10
J2---6, 7
J5---7, 8
CONFIGURABLE INPUTS*
Space Relative Humidity
Outside Air Relative Humidity
Supply Fan Status
sprh
oarh
AI (4 --- 20 ma)
AI (4 --- 20 ma)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
J4 --- 2,3 or J4 --- 5,6
fanstat
J5---1,2 or J5---3,4 or
J5 5,6 or J5---7,8
Filter Status
filtstat
Remote Occupancy Input
remocc
OUTPUTS
econocmd
Economizer Commanded Position
Supply Fan Relay State
4---20ma
J2---5
J1---4
J1---8
J1---7
J1---6
J1---5
J11 --- 3
J11 --- 7, 8
sf
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC, 1A)
Compressor 1 Relay State
Compressor 2 Relay State
Heat Stage 1 Relay State
Heat Stage 2 Relay State
Power Exhaust Relay State
Dehumidification Relay State
comp_1
comp_2
heat_1
heat_2
aux_2
humizer
LEGEND
AI --- An alog In p u t
AO --- An alog O u tp u t
DI --- Discrete In p u t
DO --- Discrete Output
*
These inputs (if installed) take the place of the default input on the specific channel according to schematic.
Parallel p in s J 5 --- 1 = J 2 --- 6, J 5 --- 3 = J 1 --- 10, J 5 --- 5 = J 1 --- 2 are u sed f or f ield --- in stallation .
The RTU-MP controller requires the use of a Carrier
space sensor. A standard thermostat cannot be used with
the RTU-MP system.
Outdoor Air Temperature (OAT) Sensor - The OAT is
factory-mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to
an eyelet mounting ring.
Supply Air Temperature (SAT) Sensor
-
On
FIOP-equipped 50TC unit, the unit is supplied with a
supply-air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 152 mm
(6-inches) in length. It is a nominal 10-k ohm thermistor.
EconoMi$er2 - The RTU-MP control is used with
EconoMi$er2 (option or accessory) for outdoor air
management. The damper position is controlled directly
by the RTU-MP control; EconoMi$er2 has no internal
logic device.
The SAT is factory-wired. The SAT probe is wire-tied to
the supply-air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re-position the sensor in the flange of the supply-air
opening or in the supply air duct (as required by local
codes). Drill or punch a 12.7 m (1/2 -in.) hole in the flange
or duct. Use two field-supplied, self-drilling screws to
secure the sensor probe in a horizontal orientation. See
Fig. 28.
Outdoor air management functions can be enhanced with
field-installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO2 sensor
Outdoor air CO2 sensor
29
Field Connections - Field connections for accessory
sensors and input devices are made the RTU-MP, at plugs
J1, J2, J4, J5, J11 and J20. All field control wiring that
connects to the RTU-MP must be routed through the
raceway built into the corner post as shown in Fig. 22.
The raceway provides the UL required clearance between
high- and low-voltage wiring. Pass the control wires
through the hole provided in the corner post, then feed the
wires thorough the raceway to the RTU-MP. Connect to
the wires to the removable Phoenix connectors and then
reconnect the connectors to the board.
Connect T
-59
- The T-59 space sensor requires a
separate, isolated power supply of 24 VAC. See Fig. 49
for internal connections at the T-59. Connect the SEN
terminal (BLU) to RTU-MP J20-1. Connect the COM
terminal (BRN) to J20-2. Connect the SET terminal (STO
or BLK) to J20-3.
BRN (COM)
BLK (STO)
BLU (SPT)
SENSOR
WIRING
Space Temperature (SPT) Sensors
OR
SET SEN
A field-supplied Carrier space temperature sensor is
required with the RTU-MP to monitor space temperature.
There are 3 sensors available for this application:
OPB COM- PWR+
S 33ZCT55SPT, space temperature sensor with override
button
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment
POWER
WIRING
24 VAC
NOTE: Must use a separate isolated transformer.
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment
C07132
Fig. 50 - Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
Use 20 gauge wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three-conductor shielded cable for the sensor and setpoint
adjustment connections. If the setpoint adjustment
(slidebar) is not required, then an unshielded, 18 or 20
gauge, two-conductor, twisted pair cable may be used.
Economizer controls —
Outdoor Air Enthalpy Control (PNO HH57AC077) -
The enthalpy control (HH57AC077) is available as a
field-installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field-installed
accessory return air enthalpy sensor (HH57AC078) is
required for differential enthalpy control. See “Return Air
Enthalpy Sensor” below.)
Connect T-55 - See Fig. 30 for typical T-55 internal
connections. Connect the T-55 SEN terminals to
RTU-MP J20-1 and J20-2. See Fig. 48.
J20-1
J20-2
SEN
SEN
Locate the enthalpy control in the economizer hood.
Locate two GRA leads in the factory harness and connect
these leads to enthalpy control sensors 2 and 3. See
Fig. 35. Connect the enthalpy control power input
terminals to economizer actuator power leads RED
(connect to TR) and BLK (connect to TR1).
C08460
Fig. 48 - RTU-MP T-55 Sensor Connections
Connect T-56 See Fig. 32 for T-56 internal
-
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
connections. Install a jumper between SEN and SET
terminals as illustrated. Connect T-56 terminals to
RTU-MP J20-1, J20-2 and J20-3 per Fig. 49.
Differential Enthalpy Control — Differential enthalpy
control is provided by sensing and comparing the outside
air and return air enthalpy conditions. Install the outdoor
air enthalpy control as described above. Add and install a
return air enthalpy sensor.
SEN
SEN
J20-1
J20-2
Return Air Enthalpy Sensor — Mount the return-air
enthalpy sensor (HH57AC078) in the return-air duct. The
return air sensor is wired to the enthalpy controller
(HH57AC077). See Fig. 36.
Jumper
SET
SET
J20-3
C08461
Fig. 49 - RTU-MP T-56 Sensor Connections
30
To wire the return air enthalpy sensor, perform the
following:
IAQ Sensor
24 VAC
J4-2
SEN
1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the enthal-
py controller.
2. At the enthalpy control remove the factory-installed
resistor from the (SR) and (+) terminals.
COM
J4-3
C08462
3. Connect the field-supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(SR+) terminal on the enthalpy controller. Connect
the BLK wire to (S) spade connector on the return air
enthalpy sensor and the (SR) terminal on the enthalpy
controller.
Fig. 51 - RTU-MP / Indoor CO2 Sensor
(33ZCSENCO2) Connections
Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
weatherproof enclosure) — The outdoor air CO2 sensor is
designed to monitor carbon dioxide (CO2) levels in the
outside ventilation air and interface with the ventilation
damper in an HVAC system. The OAQ sensor is packaged
with an outdoor cover. See Fig. 39. The outdoor air CO2
sensor must be located in the economizer outside air hood.
NOTE: The enthalpy control must be set to the “D”
setting for differential enthalpy control to work properly.
Indoor Air Quality (CO2 sensor) — The indoor air quality
sensor accessory monitors space carbon dioxide (CO2)
levels. This information is used to monitor IAQ levels.
Several types of sensors are available, for wall mounting
in the space or in return duct, with and without LCD
display, and in combination with space temperature
sensors. Sensors use infrared technology to measure the
levels of CO2 present in the space air.
Wiring the Outdoor Air CO2 Sensor — A dedicated power
supply is required for this sensor. A two-wire cable is
required to wire the dedicated power supply for the sensor.
The two wires should be connected to the power supply
and terminals 1 and 2.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
OAQ sensor. See Fig. 37. Connect the 4 to 20 mA
terminal to RTU-MP J4-5. Connect the SIG COM
terminal to RTU-MP J4-6.
The CO2 sensors are all factory set for a range of 0 to
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO2 sensor for electrical
requirements and terminal locations. See Fig. 37 for
typical CO2 sensor wiring schematic.
To accurately monitor the quality of the air in the
conditioned air space, locate the sensor near a return-air
grille (if present) so it senses the concentration of CO2
leaving the space. The sensor should be mounted in a
location to avoid direct breath contact.
OAQ Sensor/RH Sensor
J4-5
J4-6
SEN
COM
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources.
Allow at least 3 ft (0.9 m) between the sensor and any
corner. Avoid mounting the sensor where it is influenced
by the supply air; the sensor gives inaccurate readings if
the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air
before it is drawn into the return airstream.
24 VAC
C08463
Fig. 52 - RTU-MP / Outdoor CO2 Sensor
(33ZCSENCO2) Connections
Connecting Discrete Inputs
Filter Status
Wiring the Indoor Air Quality Sensor —
For each sensor, use two 2-conductor 18 AWG (American
Wire Gage) twisted-pair cables (unshielded) to connect
the separate isolated 24 vac power source to the sensor
and to connect the sensor to the RTU-MP control board
terminals.
The filter status accessory is a field-installed accessory.
This accessory detects plugged filters. When installing
this accessory, the unit must be configured for filter status
by setting MENU→Config→Inputs→input 3, 5, 8, or 9
to Filter Status and normally open (N/O) or normally
closed (N/C). Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 45 and Fig. 47 for wire
terminations at J5.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 36. Connect the 4-20 mA terminal to
RTU-MP J4-2 and connect the SIG COM terminal to
RTU-MP J4-3. See Fig. 51.
31
Fan Status
Communication Wiring -- Protocols
General
The fan status accessory is a field-installed accessory.
This accessory detects when the indoor fan is blowing air.
When installing this accessory, the unit must be
Protocols are the communication languages spoken by
control devices. The main purpose of a protocol is to
communicate information in the most efficient method
possible. Different protocols exist to provide different
kinds of information for different applications. In the BAS
application, many different protocols are used, depending
on manufacturer. Protocols do not change the function of
a controller; just make the front end user different.
configured
for
fan
status
by
setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 45 and Fig. 47 for wire terminations at J5.
Remote Occupancy
The RTU-MP can be set to communicate on four different
protocols: BACnet, Modbus, N2, and LonWorks. Switch 3
(SW3) on the board is used to set protocol and baud rate.
Switches 1 and 2 (SW1 and SW2) are used to set the
board’s network address. See Fig. 53 for the switch setting
per protocol. The 3rd party connection to the RTU-MP is
through plug J19.
NOTE: Power must be cycled after changing the SW1-3
switch settings.
Refer to the RTU-MP 3rd Party Integration Guide for
more detailed information on protocols, 3rd party wiring,
and networking.
The remote occupancy accessory is a field-installed
accessory. This accessory overrides the unoccupied mode
and puts the unit in occupied mode. When installing this
accessory, the unit must be configured for remote
occupancy by setting MENU→Config→Inputs→input 3,
5, 8, or 9 to Remote Occupancy and normally open (N/O)
or normally closed (N/C).
Also set MENU→Schedules→occupancy source to DI
on/off. Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 45 and Table 9 for wire
terminations at J5.
Space Relative Humidity Sensor - The RH sensor is not
used with these 50Hz 50TC models at this time.
SW3 Protocol Selection
DS6 DS5
OFF OFF
PROTOCOL
DS8
DS7
DS4
DS3
DS2
DS1
BACnet MS/TP
(Master)
Unused
OFF
ON
OFF
Select Baud Select Baud
Select Baud Select Baud
Modbus
(Slave)
Unused
OFF
OFF
ON
ON
OFF
N2
Unused
Unused
OFF
ON
OFF
ON
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
(Slave)
LonWorks
OFF
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE
9600
DS2
OFF
ON
DS1
OFF
OFF
ON
19,200
38,400
OFF
ON
76,800
ON
C07166
Fig. 53 - RTU-MP SW3 Dip Switch Settings
32
interface (USB-L) is required to connect a computer to
the RTU-MP board. The link cable connects a USB port
to the J12 local access port. This program functions and
operates identical to the handheld.
Local Access
6
BACview Handheld
The BACview6 is a keypad/display interface used to
connect to the RTU-MP to access the control information,
read sensor values, and test the RTU, see Fig. 54. This is
an accessory interface that does not come with the MP
controller and can only be used at the unit. Connect the
BACview6 to the RTU-MP’s J12 local access port. There
are 2 password protected levels in the display (User and
Admin). The user password is defaulted to 0000 but can
be changed. The Admin password is 1111 and cannot be
changed. There is a 10 minute auto logout if a screen is
idle. See Form 48-50H-T-2T, Appendix A for navigation
and screen content.
RTU--MP Troubleshooting
Communication LEDs
The LEDs indicate if the controller is speaking to the
devices on the network. The LEDs should reflect
communication traffic based on the baud rate set. The
higher the baud rate the more solid the LEDs will
appear. See Table 10 for further details.
Virtual BACview
Virtual BACview is a freeware computer program that
functions as the BACview6 Handheld. The USB Link
C07170
Fig. 54 - BACview6 Handheld Connections
33
Table 10 – LEDs
The LEDs on the RTU-MP show the status of certain functions
If this LED is on...
Status is...
Power
Rx
Tx
The RTU MP has power
The RTU MP is receiving data from the network segment
The RTU MP is transmitting data over the network segment
The digital output is active
DO#
The Run and Error LEDs indicate control module and network status
If Run LED shows...
And Error LED shows...
Status is...
2 flashes per second
Off
Normal
2 flashes,
2 flashes per second
2 flashes per second
2 flashes per second
2 flashes per second
Five minute auto---restart delay after system error
Control module has just been formatted
alternating with Run LED
3 flashes,
then off
4 flashes,
then pause
Two or more devices on this network have the
same ARC156 network address
Exec halted after frequent system errors or
control programs halted
On
5 flashes per second
5 flashes per second
On
Off
Exec start---up aborted, Boot is running
Firmware transfer in progress, Boot is running
7 flashes per second, alternating with
7 flashes per second
14 flashes per second
Ten second recovery period after brownout
Run LED
14 flashes per second,
alternating with Run LED
Brownout
Failure. Try the following solutions:
S
S
S
S
Turn the RTU---MP off, then on.
Format the RTU --- MP.
Download memory to the RTU---MP.
Replace the RTU---MP.
On
On
NOTE: Refer to Form 48-50H-T-2T for complete
configuration of RTU-MP, operating sequences and
troubleshooting information. Refer to RTU-MP 3rd Party
Integration Guide for details on configuration and
troubleshooting of connected networks. Have a copy of
these manuals available at unit start-up.
34
Economizer
Power
Exhaust
2 Position
Damper
Unit Without Economizer
or 2 Position Damper
C09382
Fig. 55 - EconoMi$ert IV Wiring
Differential dry-bulb sensor (EconoMi$er IV)
Outdoor enthalpy sensor
Differential enthalpy sensor
Electric Heaters
Step 11 — Adjust Factory--Installed Options
EconoMi$er IV Occupancy Switch —
Refer to Fig. 55 for general EconoMi$er IV wiring.
External occupancy control is managed through a
connection on the Central Terminal Board.
Single Point kits
Low Ambient Controls
Thermostat / Sensors
CO2 sensor
DDC interface (PremierLink)
Louvered hail guard
If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied,
open for Unoccupied sequence) at terminals marked
OCCUPANCY on CTB. Remove or cut jumper JMP 2 to
complete the installation.
Phase monitor control
Winter Start kit
Step 12 — Install Accessories
Available accessories include:
Roof Curb
Thru-base connection kit (must be installed before unit
is set on curb)
Refer to separate installation instructions for information
on installing these accessories.
Pre--Start and Start--Up
Manual outside air damper
Two-Position motorized outside air damper
EconoMi$er IV (with control and integrated barometric
relief)
This completes the mechanical installation of the unit.
Refer to the unit’s Service Manual for detailed Pre-Start
and Start-up instructions.
EconoMi$er2 (without control/for external signal and
integrated barometric relief)
35
Table 11 – Unit Wire/MOCP Sizing Data
ELECTRIC HEATER
IFM
TYPE
DISC. SIZE
Nom
(kW)
FLA
MCA
MOCP
CRHEATER***A00
FLA
LRA
---
---
15.4
15.4
17.6
20.8
32.1
35.3
16.2
16.2
18.6
21.8
33.1
36.3
17.5
20.6
23.9
38.1
44.6
55.5
18.3
21.6
24.9
39.1
45.6
56.5
22.7
26.6
29.9
44.1
50.6
61.5
25
25
25
25
35
40
25
25
25
25
35
40
20
25
25
40
45
60
20
25
25
40
50
60
30
30
30
45
60
70
15
15
16
19
30
32
16
16
17
20
30
33
18
19
22
35
41
51
19
20
23
36
42
52
24
24
27
41
47
57
75
75
6.0
6.0
CRHEATER106A00
CRHEATER108A00
11.5
14.0
23.1
25.6
---
11.5
14.0
23.1
25.6
---
75
STD
HIGH
STD
75
CRHEATER109A00
75
CRHEATER108A00,108A00
CRHEATER108A00,109A00
75
94
6.0
6.0
94
CRHEATER106A00
CRHEATER108A00
11.5
14.0
23.1
25.6
---
11.5
14.0
23.1
25.6
---
94
94
CRHEATER109A00
94
CRHEATER108A00,108A00
CRHEATER108A00,109A00
94
99
13.9
16.5
27.9
33.1
41.8
---
13.9
16.5
27.9
33.1
41.8
---
99
CRHEATER116A00
CRHEATER113A00
99
99
CRHEATER114A00
99
CRHEATER115A00
99
CRHEATER114A00,116A00
118
118
118
118
118
118
171
171
171
171
171
171
13.9
16.5
27.9
33.1
41.8
---
13.9
16.5
27.9
33.1
41.8
---
CRHEATER116A00
CRHEATER113A00
MED
CRHEATER114A00
CRHEATER115A00
CRHEATER114A00,116A00
13.9
16.5
27.9
33.1
41.8
13.9
16.5
27.9
33.1
41.8
CRHEATER116A00
CRHEATER113A00
HIGH
CRHEATER114A00
CRHEATER115A00
CRHEATER114A00,116A00
NOTE: See page 38 for table legend and notes.
36
Table 11 – Unit Wire/MOCP Sizing Data (cont)
ELECTRIC HEATER
IFM
TYPE
DISC. SIZE
Nom
(kW)
FLA
MCA
MOCP
CRHEATER***A00
FLA
LRA
---
---
17.5
20.6
23.9
38.1
44.6
55.5
17.5
20.6
23.9
38.1
44.6
55.5
19.3
22.9
26.1
40.4
46.9
57.8
21.6
21.6
23.9
44.6
55.5
53.4
23.4
23.4
26.1
46.9
57.8
55.6
26.4
26.6
29.9
50.6
61.5
59.4
20
25
25
40
45
60
20
25
25
40
45
60
25
25
30
45
50
60
25
25
25
45
60
60
30
30
30
50
60
60
30
30
30
60
70
70
18
19
22
35
41
51
18
19
22
35
41
51
20
21
24
37
43
53
23
23
23
41
51
61
25
25
25
43
53
63
28
28
28
47
57
66
108
108
108
108
108
108
114
114
114
114
114
114
172
172
172
172
172
172
123
123
123
123
123
123
181
181
181
181
181
181
189
189
189
189
189
189
13.9
16.5
27.9
33.1
41.8
---
13.9
16.5
27.9
33.1
41.8
---
CRHEATER116A00
CRHEATER113A00
STD
MED
HIGH
STD
CRHEATER114A00
CRHEATER115A00
CRHEATER114A00,116A00
13.9
16.5
27.9
33.1
41.8
---
13.9
16.5
27.9
33.1
41.8
---
CRHEATER116A00
CRHEATER113A00
CRHEATER114A00
CRHEATER115A00
CRHEATER114A00,116A00
13.9
16.5
27.9
33.1
41.8
---
13.9
16.5
27.9
33.1
41.8
---
CRHEATER116A00
CRHEATER113A00
CRHEATER114A00
CRHEATER115A00
CRHEATER114A00,116A00
13.9
16.5
33.1
41.8
50.1
---
13.9
16.5
33.1
41.8
50.1
---
CRHEATER116A00
CRHEATER113A00
CRHEATER115A00
CRHEATER114A00,116A00
CRHEATER115A00,113A00
13.9
16.5
33.1
41.8
50.1
---
13.9
16.5
33.1
41.8
50.1
---
CRHEATER116A00
CRHEATER113A00
MED
CRHEATER115A00
CRHEATER114A00,116A00
CRHEATER115A00,113A00
13.9
16.5
33.1
41.8
50.1
13.9
16.5
33.1
41.8
50.1
CRHEATER116A00
CRHEATER113A00
HIGH
CRHEATER115A00
CRHEATER114A00,116A00
CRHEATER115A00,113A00
NOTE: See page 38 for table legend and notes.
37
Legend for Table 11
LEGEND:
DISC
FLA
IFM
LRA
MCA
MOCP
--- Disconnect
--- Full load amps
--- Indoor fan motor
--- Locked rotor amps
--- Minimum circuit amps
--- Maximum over current protection
38
39
Catalog No: 50TC---C02SI
Copyright 2009 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 11/09
Replaces: NEW
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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