Carrier 42C Series Instructions and recipes

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 201 Catalog No. 534-231 Printed in U.S.A. Form 42-1SI Pg 1 12-00 Replaces: New
Book 3
Ta b 7 a
Installation and Start-Up Instructions
CONTENTS Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Optional Field-Supplied Hardware. . . . . . . . . . . . . . . . 2
• WALL-MOUNTED SPACE TEMPERATURE
SENSOR
• RELATIVE HUMIDITY SENSOR
• INDOOR AIR QUALITY (CO2) SENSOR
• LINKAGE THERMOSTAT
Control Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Fan Coil Controller Inputs and Outputs . . . . . . . . . . 5
Install Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
• RETURN AIR SENSOR INSTALLATION
• WALL-MOUNTED SPACE TEMPERATURE
SENSOR INSTALLATION
• SUPPLY AIR TEMPERATURE SENSOR
INSTALLATION
• INDOOR AIR QUALITY SENSOR
INSTALLATION (Monitor Only)
• HUMIDITY SENSOR (Wall-Mounted)
INSTALLATION
Connect the Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connect Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Connect the CCN Communication Bus . . . . . . . . . . 13
• COMMUNICATION BUS WIRE
SPECIFICATIONS
• CONNECTION TO THE COMMUNICATION
BUS
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19
Perform System Check-Out . . . . . . . . . . . . . . . . . . . . . 18
Initial Operation and Test. . . . . . . . . . . . . . . . . . . . . . . . 18
DDC Fan Coil Control Testing Procedure . . . . . . . . 18
SAFETY CONSIDERATIONS
GENERAL
The DDC Fan Coil Controller is a factory-installed, CCN
(Carrier Comfort Network) communication control for fan coil
units. The fan coil controller is a microprocessor-based direct
digital control (DDC) controller for fan coil units. See Fig. 1.
The fan coil controller can function as either a stand-alone
control or as part of the CCN. User interfaces include the CCN
Network Service Tool, ComfortVIEW™, and Comfort-
WORKS®software. When used as part of the CCN, other de-
vices such as the CCN Data Transfer, Linkage Thermostat, or
Comfort Controller can read data from or write data to the fan
coil controller.
INSTALLATION
General — The DDC fan coil controller can be connected
to a wall-mounted, field-supplied, space temperature sensor
(SPT) in order to monitor zone temperature changes and satisfy
zone demand. An optional factory-mounted return air sensor is
also available. See Fig. 2 and 3.
The following control options are available:
•heatingonly
• cooling only
• heating/cooling 2-pipe system with changeover
• heating/cooling 4-pipe system (available with 2-position
or modulating water valves)
• DX (direct expansion) cooling only
• DX cooling only and electric heat
On all heating or cooling applications, the fan coil controller
must be connected to a factory-installed supply-air temperature
(SAT) sensor to monitor the temperature of the air delivered by
the fan coil.
The following factory-installed sensor options are available:
• return-air sensor
• return-air sensor with T56 sensor (set point adjustment)
• return-air sensor with T57 fan coil thermostat (provides
set point adjustment and fan speed adjustment)
• changeover sensor
Carrier’s Network Service Tool can be connected to the sys-
tem at the SPT sensor if CCN communication wiring is run to
an RJ-11 jack at the SPT sensor. The Network Service Tool can
be used to adjust set points, set operating parameters, and fully
configure the fan coil controller.
SAFETY NOTE
Air-handling equipment will provide safe and reliable
service when operated within design specifications. The
equipment should be operated and serviced only by
authorized personnel who have a thorough knowledge
of system operation, safety devices and emergency
procedures.
Good judgement should be used in applying any manu-
facturer’s instructions to avoid injury to personnel or dam-
age to equipment and property.
Disconnect all power to the unit before performing mainte-
nance or service. Unit may automatically start if power is
not disconnected. Electrical shock and personal injury
could result.
If it is necessary to remove and dispose of mercury contac-
tors in electric heat section, follow all local, state, and fed-
eral laws regarding disposal of equipment containing
hazardous materials.
DDC Fan Coil Controller
42C,D,S,V Units

2
SUPPLY AIR TEMPERATURE (SAT) SENSOR — The fan
coil controller must be connected to a factory-supplied supply-
air temperature (SAT) sensor (part number HH79NZ005) to
monitor the temperature of the air delivered by the fan coil.
CHANGEOVER SENSOR — The 33ZCSENCHG change-
over sensor is used by the fan coil controller in 2-pipe applica-
tions to determine the temperature of the heating and cooling
medium which is supplied to the fan coil by the building piping
system. The fan coil controller can then determine if it is capa-
ble of providing heating or cooling to the space based on sens-
ing the pipe water temperature. This value may be broadcast to
other fan coils.
Optional Field-Supplied Hardware — Each fan coil
controller can support the following field-supplied components
to complete its installation:
• wall-mounted space temperature sensor (as required)
• indoor air quality sensor (as required)
• relative humidity sensor (as required)
• linkage thermostat (as required)
WALL-MOUNTED SPACE TEMPERATURE SEN-
SOR — Each fan coil controller can support a field-supplied
Carrier space temperature sensor. There are three sensors avail-
able for this application:
• 33ZCT55SPT, Space Temperature Sensor with Override
Button
• 33ZCT56SPT, Space Temperature Sensor with Override
Button and Set Point Adjustment
• 33ZCT57SPT, Space Temperature Sensor with Override
Button, Set Point Adjustment, and Manual Fan Speed
control
RELATIVEHUMIDITYSENSOR—The33AMSENRHS000
relative humidity sensor is an indoor,wall-mounted sensor and is
requiredforzonehumidity control(dehumidification).
INDOOR AIR QUALITY (CO2) SENSOR — An indoor air
quality sensor is required for IAQ monitoring. Two different
CO2sensors are available for zone CO2level monitoring.
The 33ZCSENCO2 sensor is an indoor, wall mounted sen-
sor with an LED (light-emitting diode) display.
The 33ZCT56CO2 sensor is an indoor, wall mounted sen-
sor without display. The CO2sensor also includes a space tem-
perature sensor with override button and temperature offset.
LINKAGE THERMOSTAT — The linkage thermostat
(33CSKITLST-01) is used to control multiple units from a sin-
gle thermostat. The linkage thermostat provides thermostat
functions for up to 8 units. The fan operates in Auto mode only
when multiple units are controlled by the linkage thermostat.
Thermostat functions include space temperature sensing, set
point adjustment, and occupancy scheduling. The linkage ther-
mostat can be used in place of any space temperature sensor.
For fail-safe operation, it is recommended to include a
HH79NZ005 return air sensor mounted in the return air duct of
the unit.
Control Power — An individual, factory-supplied, 24 vac
power transformer is supplied for each fan coil controller.
Transformers are UL (Underwriters’ Laboratories) Class 2 rat-
ed. Standard applications require a 24 VAC transformer, rated
at 40 VA minimum. All transformer secondaries are grounded.
The control transformer secondary is 24 vac nominal at
40 va (50/60 Hz).
The factory-supplied transformer provides sufficient power
to supply the DDC fan coil controller and the fan relay board.
The fan relay board is used to interface between the DDC
fan coil controller’s 24-vac control voltage outputs and the
fan’s line voltage connections.
J4
RH
GND
IAQ
+10V
SPEED
GND
CONDSW
GND
+24V
SPT
GND
SAT
T56
GND
CNGOVR
REMOTE
J3
J1
SRVC
24VAC
+
G-
Part Number: 33ZCFANCOL
S/N:
Bus#:
Element#:
Unit#:
J5
VLV/DX1 COM VLV/DX2 HEAT1 24VAC HEAT2
ZONE Controller
®
CUS
16
31
+
G
-
J2A CCN
LEN
J2B
+
G
-
1
1
1
3
3
2
15
16
FAN AC
FAN ON
LOW
MED
HIGH
J6
1
5
LED1
LED2
24VAC
OAD ENA
J7
1
2
Fig. 1 —Fan Coil Controller (33ZCFANCOL)

3
RH
GND
IAQ
+10V
SPEED
GND
CONDSW
GND
+24DC
SPT
GND
SAT
T56
GND
CHGOVR
REMOTE
BLK OPEN
WHT COM
RED CLOSE
VALVES
P/N: 33ZCFANCOL
J5
J2
J3
ORG
J1
ORG
YEL
QC
TRANSFORMER
BLU YEL GRN
WHT
BLK
BLK *WHT
L1
L2 OR N
EQUIPMENT GROUND
SERVICE SWITCH
Q/C
2
1
3
J7
FRESH
AIR
DAMPER
1
2 3
4
5
J6
FAN AC
FAN ON
MED
HI
24AC
ODA
1
2
3
1 2
3
YEL
G
G2/(W)
G3/(Y)
COM
33ZCRLYBRD
FAN
BLK
(VALVE)
(COOL)
HI
MED
(HEAT)
LOW
BLOWER
MOTOR
DAMPER
MOTOR
BLK H
BLU M
RED L
WHT COM
BLK
BLK
QUICK CONNECT
OPTIONAL
RETURN AIR SENSOR WHEN REQUIRED (HH79NZ008)
SUPPLY AIR SENSOR (HH79NZ005)
CHANGEOVER SENSOR WHEN REQUIRED (33ZCSENCHG)
UNIT MOUNTED
CONTROL BOX
YEL
YEL
BLK
BLK
J4
24
BLK WHT
RED
BLK
BLU
RED
HEAT
2
HEAT
1
VAL
DX1 VAL
DX2
COM
COM
24V
FACTORY INSTALLED ON UNIT MOUNTED APPLICATIONS
T55, T56 OR
T57 SENSOR
OR WALL MOUNTED ON FIELD INSTALLATIONS
(OPTIONAL)
OPTIONAL
(MODULATING
VALVE SHOWN)
RED WIRE NOT USED ON 2-POSITION VALVE
:
Disconnect power before servicing.
LEGEND
Wire Connection Factory Wiring Field Wiring
NOTES:
1. See nameplate for correct voltage. Use 75°C minimum copper conductors only. Unit terminals are not designed to accept any other wiring. 2. Motor(s) thermally protected units with 2 motors wired parallel. 3. Provide disconnect means and overcurrent protection as required.
Fig. 2 —Fan Coil Controller Wiring (Two-Pipe System)

4
RH
GND
IAQ
+10V
SPEED
GND
CONDSW
GND
+24DC
SPT
GND
SAT
T56
GND
CHGOVR
REMOTE
BLK OPEN
WHT COM
RED CLOSE
(MODULATING
VALVE SHOWN)
P/N: 33ZCFANCOL
J5
J2
J3
ORG
J1
ORG
YEL
QC
TRANSFORMER
BLU YEL GRN
WHT
BLK
BLK *WHT
L1
L2 OR N
EQUIPMENT GROUND
SERVICE
SWITCH
J7
FRESH
AIR
DAMPER
1
2 3
4
5
J6
FAN AC
FAN ON
MED
HI
24AC
OAD
1
2
3
1 2
3
YEL
G
G2/(W)
G3/(Y)
COM
33ZCRLYBRD
FAN
BLK
(VALVE)
(COOL)
HI
MED
(HEAT)
LOW
BLOWER
MOTOR
DAMPER
MOTOR
BLK H
BLU M
RED L
WHT COM
BLK
BLK
QUICK CONNECT
OPTIONAL
RETURN AIR SENSOR (HH79NZ008)
SUPPLY AIR SENSOR (HH79NZ005)
UNIT MOUNTED
CONTROL BOX
YEL
YEL
BLK
BLK
J4
Q/C
2
1
3
Q/C
2
1
3
COOL
HEAT
BLK
WHT
RED BLK WHT RED
BLK OPEN
WHT COM
RED CLOSE
1 2
RED BLU
BLK
24
T55, T56 OR
T57 SENSOR
FACTORY INSTALLED ON UNIT MOUNTED APPLICATIONS OR WALL MOUNTED ON FIELD INSTALLATIONS
VA L
DX1 COM
VA L
DX2 HEAT
1
HEAT
2
COM
24V
WHEN REQUIRED
(OPTIONAL)
OPTIONAL
(MODULATING
VALVE SHOWN)
(NOTE 4)
(NOTE 4)
:
Disconnect power before servicing.
LEGEND
Wire Connection Factory Wiring Field Wiring
NOTES:
1. See nameplate for correct voltage. Use 75°C minimum copper conductors only. Unit terminals are not designed to accept any other wiring. 2. Motor(s) thermally protected units with 2 motors wired parallel. 3. Provide disconnect means and overcurrent protection as required. 4. Red wire is not used with 2-position valves.
Fig. 3 —Fan Coil Controller Wiring (Four-Pipe System)

5
Fan Coil Controller Inputs and Outputs —The fan
coil controller inputs andoutputs are shownin Fig. 4-6.
Install Sensors —The return air sensor and space tem-
perature sensors can come factory installed in the fan coil unit
or can be field installed and wall mounted. There are multiple
options for these sensors:
• return air sensor only (factory-installed in fan coil unit)
• return air sensor and T-56 space temperature sensor
(both sensors are factory-installed in fan coil unit, the
T-56 sensor is used for set point offset control only)
• return air sensor and T-57 space temperature sensor
(both sensors are factory-installed in fan coil unit, the
T-57 sensor is used for set point offset and fan speed
control only)
There are also applications where wall-mounted space tem-
perature sensors are required. In these applications, the T-55,
T-56, or T-57 sensor is wall mounted outside the fan coil unit.
The room temperature from the wall-mounted sensor is used in
place of the return air sensor reading. Field-wiring and installa-
tion are required.
RETURN AIR SENSOR INSTALLATION — The return air
sensor is factory-mounted and factory-wired in the fan coil unit.
No installation is required.
NOTE: When a wall-mounted space temperature sensor is
used, the return air sensor is disconnected by the installer.
WALL-MOUNTED SPACE TEMPERATURE SENSOR
INSTALLATION — Wall-mounted space temperature sen-
sors are used in place of the return-air sensor when required.
See Fig. 7. Wall-mounted space temperature sensors must be
field installed and wired. If wall-mounting is required, perform
the following procedure.
The wall-mounted space temperature sensor is used to mea-
sure the building interior temperature and should be located on
an interior building wall. The sensor wall plate accommodates
the NEMA standard 2 x 4 junction box. The sensor can be
mounted directly on the wall surface if acceptable by local
codes.
Do not mount the sensor in drafty locations such as near air
conditioning or heating ducts, over heat sources such as base-
board heaters, radiators, or directly above wall mounted light-
ing dimmers. Do not mount the sensor near a window which
may be opened, near a wall corner, or a door. Sensors mounted
in these areas will have inaccurate and erratic sensor readings.
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
and mount the sensor at least 2 ft from an open doorway.
246 810 12 14 16
13579
11 13 15
+24VDC SUPPLY
SPT
GROUND
SAT
REMOTE S/S
CHANGEOVER SENSOR
GROUND
T56 SETPOINT OFFSET
GROUND
COND PUMP
GROUND
MANUAL SPEED +10V (DI)
IAQ
GROUND
RH
J4
LEGEND
*Use shielded wire.
DI —Discrete Input
IAQ —Indoor Air Quality
RH —Relative Humidity
SAT —Supply-Air Temperature
SPT —Space Temperature
S/S —Start/Stop
Fig. 4 —Fan Coil Controller Inputs
Inputs (J4)
CHANNEL J4 PINS (+,–) DESCRIPTION CONTROL DEVICE
SPT 14, 12 Space Temperature 10K Thermistor
SAT 10, 12 Supply Air Temperature 10K Thermistor
SP_OFFSET (T56/T57) 8, 12 Set Point Offset Adjust 100K Potentiometer
CNGOVR 4, 6 Changeover Sensor 10K Thermistor
RH 16 (24 VDC),
15 (+), 13 (–)RH Sensor 2-10 VDC
SPEED 9*, 7 (+), 5 (–) Manual Speed Position 0-10 VDC
CONDSW 3, 9* Condensate Pump Sensor 0-10 V (DI)
IAQ 11 (+), 13 (–) Indoor Air Quality Sensor 0-10 VDC
REMOTE S/S 2, 16 (24 VDC) Remote Start/Stop 24 VAC (DI)

6
12345
J6 J7
12
24VAC
OAD
FAN (24VAC)
FAN ON (LOW SPEED)
NOT USED
MED SPEED
HIGH SPEED
Warm
Cool
Fig. 5 —Fan Coil Controller Daughter Board Outputs
Daughter Board Outputs (J6, J7)
NOTE: J6-1 must be jumpered to 24 VAC +. (J1-1).
CHANNEL TERMINATIONS(+,–) DESCRIPTION CONTROL DEVICE
FAN AC J6-1, J1-1 Fan Input Power 24V, 5A
FAN O N J6-2, J1-2 Fan Start/Stop
(Low Speed) 24V, 5A
LOW J6-3, J1-2 Not Used 24V, 5A
MED J6-4, J1-2 Med Speed 24V, 5A
HI J6-5, J1-2 High Speed 24V, 5A
OAD J7-1, J7-2 Outdoor Air Damper 24 VAC 1A
Baseboard Outputs (J5)
*Terminals 1 and 3 provide switched 24 VAC output power to the load.
†J5-5 must be jumpered to 24 VAC + (J1-1).
CHANNEL J5 Pins (+,–) DESCRIPTION CONTROL DEVICE
Valve DX1 1, 2* Open 24 VAC, 1A
Valve DX2 3, 2* Close 24 VAC, 1A
HEAT_ST1 5, 4†Heat Open, 1st Stage 24 VAC, 1A
HEAT_ST2 5, 6†Heat Close, 2nd Stage 24 VAC, 1A
VALVE/DX1 (OPEN)
GROUND
VALVE/DX2 (CLOSE)
HEAT CLOSE/
STAGE 2
COMMON (24VAC)
HEAT OPEN/
STAGE 1
123456
J5
Fig. 6 —Fan Coil Controller Baseboard Outputs
Fig. 7 —Space Temperature Sensor
(P/N 33ZCT56SPT Shown)

7
Install the sensor as follows (see Fig. 8):
1. Locate the two Allen type screws at the bottom of the
sensor.
2. Turn the two screws clockwise to release the cover from
the sensor wall mounting plate.
3. Lift the cover from the bottom and then release it from
the top fasteners.
4. Feed the wires from the electrical box through the open-
ing in the center of the sensor mounting plate.
5. Using two no. 6-32 x 1 mounting screws (provided with
the sensor), secure the sensor to the electrical box.
NOTE: Sensor may also be mounted directly on the wall
using 2 plastic anchors and 2 sheet metal screws
(field-supplied).
6. Use 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 com-
munication 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.
The CCN network service jack requires a separate,
shielded CCN communication cable. Always use sepa-
rate cables for CCN communication and sensor wir-
ing. (Refer to Fig. 9 and 10 for wire terminations.)
7. Replace the cover by inserting the cover at the top of
the mounting plate first, then swing the cover down
over the lower portion. Rotate the two Allen head
screws counterclockwise until the cover is secured to
the mounting plate and locked in position.
8. For more sensor information, see Table 1 for ther-
mistor resistance vs temperature values.
NOTE: Clean sensor with damp cloth only. Do not use
solvents.
Wiring the Space Temperature Sensor — To wire the sensor,
perform the following (see Fig. 9 and 10):
1. Identify which cable is for the sensor wiring.
2. Strip back the jacket from the cables for at least 3-inches.
Strip 1/4-in. of insulation from each conductor. Cut the
shield and drain wire from the sensor end of the cable.
3. Connect the sensor cable as follows:
a. Remove the factory-installed wire between the ter-
minals labelled SPT and the return air sensor.
b. Connect one wire from the cable (RED) to the SPT
terminal on the controller. Connect the other end of
the wire to the left terminal on the SEN terminal
block of the sensor.
c. Connect another wire from the cable (BLACK) to
the GND terminal on the controller. Connect the
other end of the wire to the remaining open
terminal on the SEN terminal block (COM on
33ZCT57SPT).
d. Connect the remaining wire (WHITE/CLR) to the
T56 terminal on the controller. Connect the other
end of the wire to the SET terminal on the sensor.
e. In the control box, install a no. 10 ring type crimp
lug on the shield drain wire. Install this lug under
the mounting screw of the fan coil controller.
f. On 33ZCT55SPT or 33ZCT56SPT thermostats
install a jumper between the two center terminals
(right SEN and left SET). See Fig. 9.
g. On 33ZCT57SPT thermostats, a separate 3-
conductor, shielded cable is used to connect the fan
speed wiring. Connect the SPD terminal on the
thermostat to the SPEED terminal on the fan coil
controller. Use the white/clr wire. Connect the
COM terminal on the thermostat to the GND ter-
minal on the fan coil controller. Use the black wire.
Connect the 10V terminal on the thermostat to the
+10V terminal on the fan coil controller. Use the
red wire.
In the control box, install a no. 10 ring type crimp
lug on the fan speed wiring shield drain wire.
Install this lug under the mounting screw of the fan
coil controller.
Wiring the CCN Network Communication Service Jack —
See Fig. 9 and 10. To wire the service jack, perform the
following:
1. Strip back the jacket from the CCN communication
cable(s) for at least 3 inches. Strip 1/4-in. of insulation
from each conductor. Remove the shield and separate the
drain wire from the cable. Twist together all the shield
drain wires and fasten them together using an closed end
crimp lug or a wire nut. Tape off any exposed bare wire to
prevent shorting.
2. Connect the CCN + signal wire(s) (RED) to Terminal 5.
3. Connect the CCN – signal wire(s) (BLACK) to
Terminal 2.
4. Connect the CCN GND signal wire(s) (WHITE/CLR) to
Terminal 4.
Before wiring the CCN connection, refer to the Connect the
CCN Communication Bus section on page 13, for communica-
tion bus wiring and cable selection. The cable selected must be
identical to the CCN communication bus wire used for the
entire network.
The other end of the communication bus cable must be con-
nected to the remainder of the CCN communication bus. If the
cable is installed as a T-tap into the bus, the cable length cannot
exceed 50 ft. No more than 10 T-taps are allowed per bus. Wire
the CCN service jack of the sensor in a daisy chain arrange-
ment with other equipment. Refer to the Connect to the CCN
Communication Bus section, page 13, for more details. See
Fig. 11.
Table 1 —Thermistor Resistance vs Temperature Values for Space Temperature Sensor, Return-Air
Temperature Sensor, and Supply-Air Temperature Sensor
TEMP (C) TEMP (F) RESISTANCE (Ohms) TEMP (C) TEMP (F) RESISTANCE (Ohms)
–40 –40 335,651 20 68 12,494
–35 –31 242,195 25 77 10,000
–30 –22 176,683 30 86 8,056
–25 –13 130,243 35 95 6,530
–20 –4 96,974 40 104 5,325
–15 5 72,895 45 113 4,367
–10 14 55,298 50 122 3,601
–5 23 42,315 55 131 2,985
0 32 32,651 60 140 2,487
5 41 25,395 65 149 2,082
10 50 19,903 70 158 1,752
15 59 15,714

8
2345 61
SW1
SEN SET
Cool Warm
WHT
(T56)
BLK (GND)
RED (SPT)
RED(+)
WHT(GND)
BLK(-) CCN COM
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
3-CONDUCTOR
SHIELDED CABLE 3-CONDUCTOR
SHIELDED CABLE
WHITE (SPEED)
NOTE: Dimensions are in inches.
Fig. 8 —Space Temperature Sensor and Wall
Mounted Humidity Sensor Mounting
NOTE: On factory-installed unit mounted applications, the SPT ter
-
minal is not wired to the SEN terminal.
Fig. 9 —Space Temperature Sensor Wiring
(33ZCT56SPT)
LEGEND
NOTES:
1. Do not connect white wire to SET termi-
nal if set point adjustment is not
needed.
2. On factory-installed unit mounted appli-
cations, the SPT terminal is not wired to
the SEN terminal.
CCN —Carrier Comfort Network
SW1 —Switch
Set Point —Set Point Adjust
Fig. 10 —Fan Coil Thermostat Wiring (33ZCT57SPT)

9
Fig. 11 —Communication Bus Wiring to Fan Coil Zone Controller
Warm
Cool Warm
Cool
2 COND TWISTED
CABLE OR 3 COND
CABLE (TEMP
SENSOR WIRING) (TYP)
CCN COMM BUS
SPACE
TEMPERATURE
SENSOR
3 COND COMM CABLE (TYP)
Warm
Cool Warm
Cool
2 COND TWISTED
CABLE OR 3 COND
CABLE (TEMP
SENSOR WIRING) (TYP)
SPACE
TEMPERATURE
SENSOR
DISTANCE GREATER
THAN 50 FT.
CCN COMM BUS
TYPICAL
FAN COIL UNIT
FAN COIL
ZONE
CONTROLLER
50 FT. MAXIMUM
Wiring when distance between fan coil controller and space temperature sensor is 50 feet or less
Wiring when distance between fan coil controller and space temperature sensor is greater than 50 feet

10
SUPPLY AIR TEMPERATURE (SAT) SENSOR INSTAL-
LATION — On fan coil units with heating or cooling, the SAT
sensor is factory-installed. The SAT is factory-installed in the
fan coil air outlet. No installation is required. The part number
is HH79NZ005.
INDOOR AIR QUALITY SENSOR INSTALLATION
(Monitor Only) — The indoor air quality (IAQ) sensor acces-
sory monitors carbon dioxide levels. This information is used
to monitor IAQ levels. Three types of sensors are provided.
The wall sensor can be used to monitor the conditioned air
space. Sensors use infrared technology to measure the levels of
CO2present in the air. The wall sensor is available with or
without an LCD readout to display the CO2level in ppm. See
Fig. 12.
Sensor accessory descriptions and part numbers are shown
in Table 2. To mount the sensor, refer to the installation instruc-
tions shipped with the accessory kit.
Table 2 —CO2Sensor Accessories
The CO2sensors listed in Table 2 are all factory set for a
range of 0 to 2000 ppm and a linear voltage output of 0 to
10 vdc. Refer to the instructions supplied with the CO2sensor
for electrical requirements and terminal locations.
To accurately monitor the quality of the air in the condi-
tioned air space, locate the sensor near a return air grille (if
present) so it senses the concentration of CO2leaving the
space. The sensor should be mounted in a location to avoid
direct breath contact.
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources. Allow
at least 3 ft 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
air-stream.
Indoor Air Quality Sensor Wiring — To wire the sensors
after they are mounted in the conditioned air space or outdoor
location, see Fig. 13 and the instructions shipped with the sen-
sors. For each sensor, use two 2-conductor 18 AWG twisted-
pair cables (unshielded) to connect the separate isolated 24 vac
power source to the sensor and to connect the sensor to the con-
trol board terminals. To connect the sensor to the control board,
identify the positive (0-10 VDC) and ground (SIG COM) ter-
minals on the sensor. Connect the 1-10 VDC terminal to termi-
nal IAQ and connect the SIG COM terminal to terminal GND.
HUMIDITY SENSOR (Wall-Mounted) INSTALLA-
TION — The accessory space humidity sensor is installed on
an interior wall to measure the relative humidity of the air with-
in the occupied space. See Fig. 14.
The use of a standard 2- x 4-in. electrical box to accommo-
date the wiring is recommended for installation. The sensor can
be mounted directly on the wall, if acceptable by local codes.
If the sensor is installed directly on a wall surface, install the
humidity sensor using 2 screws and 2 hollow wall anchors
(field-supplied); do not overtighten screws. See Fig. 8.
The sensor must be mounted vertically on the wall. The
Carrier logo should be oriented correctly when the sensor is
properly mounted.
DO NOT mount the sensor in drafty areas such as near heat-
ing or air-conditioning ducts, open windows, fans, or over heat
sources such as baseboard heaters, radiators, or wall-mounted
light dimmers. Sensors mounted in those areas will produce
inaccurate readings.
Avoid corner locations. Allow at least 4 ft between the sen-
sor and any corner. Airflow near corners tends to be reduced,
resulting in erratic sensor readings.
Sensor should be vertically mounted approximately 5 ft up
from the floor, beside the space temperature sensor.
For distances up to 500 feet, use a 3-conductor, 18 or
20 AWG cable. A CCN communication cable can be used,
although the shield is not required. The shield must be removed
from the sensor end of the cable if this cable is used. See
Fig. 15 for wiring details.
The power for the sensor is provided by the control board.
The board provides 24 vdc for the sensor. No additional power
source is required.
To wire the sensor, perform the following:
1. At the sensor, remove 4-in. of jacket from the cable. Strip
1/4-in. of insulation from each conductor. Route the cable
through the wire clearance opening in the center of the
sensor.
2. Connect the RED wire to the sensor screw terminal
marked (+).
3. Install one lead from the resistor (supplied with the sen-
sor) and the WHITE wire, into the sensor screw terminal
marked (–). After tightening the screw terminal, test the
connection by pulling gently on the resistor lead.
4. Connect the remaining lead from the resistor to the
BLACK wire and secure using a closed end type crimp
connector or wire nut.
5. Using electrical tape, insulate any exposed resistor lead to
prevent shorting.
6. At the control box, remove the jacket from the cable and
route the RED conductor over to the left side of the con-
trol board. Route the remaining conductors to the right
side of the control board.
7. Strip 1/4-in. of insulation from each conductor and equip
each with a 1/4-in. female quick connect terminal.
8. Connect the RED wire to terminal 24VDC on the control
board.
NOTE: The 24VDC terminal is used for RH sensor
wiring only.
9. Connect the BLACK wire to terminal GND on the con-
trol board.
10. Connect the WHITE/CLEAR wire to terminal RH on the
control board.
11. Connect shield to ground (if shielded wire is used).
Connect the Outputs —Wire the fan coil controller’s
outputs (fan, staged heat, valves) as shown in the applicable
typical wiring diagrams in Fig. 2 and 3. Please refer to fan coil
unit schematic for full wiring details.
CO2SENSOR
ACCESSORY
PART NUMBERS
DESCRIPTION
33ZCSENCO2 Wall Mount Sensor (with display)
33ZCT55CO2
Wall Mount Sensor with
33ZCT55SPT space temperature
sensor (no display)
33ZCT56CO2
Wall Mount Sensor with
33ZCT56SPT space temperature
sensor and set point adjustment (no
display)
Do NOT clean or touch the sensing element with chemical
solvents; they can permanently damage the sensor.

11
3.25
(8.3)
5.625
(14.3)
1.125
(2.9)
0.25
(0.8)
5
(12.7)
+24V DC
OAD
24VAC
Equipment Ground
24VAC
DX2
Valve
Voltage
Line
ON
FAN
HEAT2
HEAT1
COM
CONDSW
REMOTE
CNGOVR
T56
SAT
SPT
IAQ
SPEED
+10V
GND
GND
GND
GND
GND
RH
Damper
Air
Fresh
HIGH
MED
LOW
FAN AC
B
W
R
-
B
GND
W
+
R
24 VAC
DX1
Valve
communications
CCN
Not Used
communications
CCN
LINE VOLTAGE
24 VAC
SEPARATE
POWER
SUPPLY
REQUIRED
J1
1
2
3
21 87
NOTE: Dimensions are in inches.
Dimensions in ( ) are in centimeters.
Fig. 12 —Indoor Air Quality (CO2) Sensor
(33ZCSENCO2) (Monitor Only)
Fig. 13 —IAQ Sensor Wiring (Monitor Only)

12
+24V DC
OAD
24VAC
Equipment Ground
HUMIDITY SENSOR
BLACK
WHITE
RED
(If Used)
Shield
-
+
499
24VAC
DX2
Valve
Voltage
Line
ON
FAN
HEAT2
HEAT1
COM
CONDSW
REMOTE
CNGOVR
T56
SAT
SPT
IAQ
SPEED
+10V
GND
GND
GND
GND
GND
RH
Damper
Air
Fresh
HIGH
MED
LOW
FAN AC
B
W
R
-
B
GND
W
+
R
24 VAC
DX1
Valve
communications
CCN
Not Used
communications
CCN
J1
1
2
3
Fig. 14 —Wall Mounted Relative Humidity Sensor (P/N 33AMSENRHS000)
Fig. 15 —Humidity Sensor Wiring

13
Connect Accessories —Refer to accessory installa-
tion instructions for installation procedures. Fan coil controller
wiring is shown for the following accessories:
• Linkage Thermostat (Fig. 16)
• Condensate Pump Switch (Fig. 17)
• Two-Position Minimum Outdoor Air Damper (Fig. 18)
• Remote Occupancy (Fig. 19)
Connect the CCN Communication Bus —The fan
coil controllers connect to the bus in a daisy chain arrangement.
The fan coil controller may be installed on a primary CCN bus
orona secondary busfromtheprimaryCCNbus.Connectingto
a secondary bus is recommended.
At any baud (9600, 19200, 38400 baud), the number of con-
trollers is limited to 239 zones maximum. When Carrier link-
age thermostats are used on the same bus as fan coil units, no
more than 128 fan coils and 12 linkage thermostats may be on
the same bus. Bus length may not exceed 4000 ft, with no more
than 60 total devices on any 1000-ft section. Optically isolated
RS-485 repeaters are required every 1000 ft.
NOTE: Carrier linkage thermostats operate at 9600 band.
The first fan coil controller in a network connects directly to
the bridge and the others are wired sequentially in a daisy chain
fashion. Refer to Fig. 20 for an illustration of CCN Communi-
cation Bus wiring.
The CCN Communication Bus may also connect to the fan
coil controller space temperature sensor. Refer to the Install
Sensors section for sensor wiring instructions.
COMMUNICATION BUS WIRE SPECIFICATIONS —
The Carrier Comfort Network (CCN) Communication Bus
wiring is field-supplied and field-installed. It consists of
shielded three-conductor cable with drain (ground) wire. The
cable selected must be identical to the CCN Communication
Bus wire used for the entire network. See Table 3 for recom-
mended cable.
Table 3 —Recommended Cables
NOTE: Conductors and drain wire must be at least 20 AWG
(American Wire Gage), stranded, and tinned copper. Individual con-
ductors 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.
CONNECTION TO THE COMMUNICATION BUS
1. Strip the ends of the red, green/white, and black conduc-
tors of the communication bus cable.
2. Connect one end of the communication bus cable to the
bridge communication port labeled COMM2 (if connect-
ing on a secondary bus).
When connecting the communication bus cable, a color
code system for the entire network is recommended to
simplify installation and checkout. See Table 4 for the
recommended color code.
Table 4 —Color Code Recommendations
3. Connect the other end of the communication bus cable to
the terminal block labeled CCN in the fan coil controller
of the first air terminal. Following the color code in
Table 4, connect the Red (+) wire to Terminal 1. Connect
the Green/White (ground) wire to Terminal 2. Connect
the Black (–) wire to Terminal 3.
4. Connect additional fan coil controllers in a daisy chain
fashion, following the color coded wiring scheme in
Table 4. Refer to Fig. 20.
NOTE: The communication bus drain wires (shield) must be
tied together at each fan coil controller. 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, connect the shields to ground at a
lightning suppressor in each building where the cable enters or
exits (one point only).
MANUFACTURER CABLE PART NO.
Alpha 2413 or 5463
American A22503
Belden 8772
Columbia 02525
SIGNAL TYPE CCN BUS WIRE
COLOR
PLUG PIN
NUMBER
+Red 1
Ground Green/White 2
–Black 3

14
Fig. 16 —Linkage Thermostat Wiring Connections (Field-Installed)

15
Use two conductor shielded cable
OAD
24VAC
Equipment Ground
24VAC
DX2
Valve
Voltage
Line
ON
FAN
HEAT2
HEAT1
COM
CONDSW
REMOTE
CNGOVR
T56
SAT
SPT
+24V DC
IAQ
SPEED
+10V
GND
GND
GND
GND
GND
RH
Damper
Air
Fresh
HIGH
MED
LOW
FAN AC
B
W
R
-
B
GND
W
+
R
24 VAC
DX1
Valve
communications
CCN
Not Used
communications
CCN
10 uf, 25VDC
+
Fig. 17 —Condensate Pump Switch Wiring (Field-Installed)
NOTE: To ensure that the switch operates reliably in a low voltage circuit, install a field-supplied
10 µf, 25 VDC capacitor across the switch contacts. Be sure to observe polarity.

16
OAD
24VAC
communications
CCN
Not Used
communications
CCN
+24V DC
Equipment Ground
24VAC
DX2
Valve
Voltage
Line
ON
FAN
HEAT2
HEAT1
COM
CONDSW
REMOTE
CNGOVR
T56
SAT
SPT
IAQ
SPEED
+10V
GND
GND
GND
GND
GND
RH
Damper
Air
Fresh
HIGH
MED
LOW
FAN AC
B
W
R
-
B
GND
W
+
R
24 VAC
DX1
Valve
J1
1
2
3
TWO
POSITION
DAMPER
Fig. 18 —Two-Position, Minimum Outdoor Air Damper Wiring (Field-Installed)

17
+24V DC
OAD
24VAC
Equipment Ground
24VAC
DX2
Valve
Voltage
Line
ON
FAN
HEAT2
HEAT1
COM
CONDSW
REMOTE
CNGOVR
T56
SAT
SPT
IAQ
SPEED
+10V
GND
GND
GND
GND
GND
RH
Damper
Air
Fresh
HIGH
MED
LOW
FAN AC
B
W
R
-
B
GND
W
+
R
24 VAC
DX1
Valve
communications
CCN
Not Used
communications
CCN
J1
1
2
3
CCN
123
CCN
123
CCN
123
CCN
123
COMM
123
GND
1000 FT. MAXIMUM
DRAIN WIRE (TYP)
BLK (TYP)
WHT (TYP)
RED (TYP)
FCC
FCC
FCC
FCC
BRIDGE
(RECOMMENDED)
Fig. 19 —Remote Occupancy Wiring (Field-Installed)
LEGEND
Fig. 20 —Communication Bus Wiring
CCN —Carrier Comfort Network
FCC —Fan Coil Controller

18
START-UP
Use the Carrier network communication software to start up
and configure the fan coil controller.
All set-up and set point configurations are factory-set and
field-adjustable.
Changes can be made using the ComfortWORKS® soft-
ware, ComfortVIEW™ software, or Network Service Tool.
The Network Service Tool is a portable interface device that al-
lows the user to change system set-up and set points from a
zone sensor or terminal control module. During start-up, the
Carrier software can also be used to verify communication
with each fan coil controller.
For specific operating instructions, refer to the literature
provided with the software.
Perform System Check-Out
1. Check correctness and tightness of all power and commu-
nication connections.
2. At the fan coil, check fan and system controls for proper
operation.
3. At the fan coil, check electrical system and connections
of any optional electric reheat coil. If hot water reheat is
used, check piping and valves against job drawings.
4. Check to be sure the area around the fan coil is clear of
construction dirt and debris.
5. Check that final filters are installed in the fan coil. Dust
and debris can adversely affect system operation.
6. Verify that the fan coil controller controls are properly
connected to the CCN bus.
Initial Operation and Test —Perform the following
procedure:
1. Apply 24 vac power to the control.
2. Connect the Network Service Tool to the phone jack ser-
vice port of the controller.
3. Using the Network Service Tool, upload the controller
from address 0,1. The address may be set at this time.
Make sure that Network Service Tool is connected to this
fan coil unit only when changing the address.
DDC Fan Coil Control Testing Procedure —
The Network Service Tool, ComfortVIEW or Comfort-
WORKS software can be used to test the fan coil unit for
proper operation. The software may also be used to change or
modify the appropriate decisions as required for each factory-
supplied accessory package (supplied with unit).
The control inputs are tested to verify functionality and
proper input operation. The control outputs are tested to verify
that the output devices are wired correctly and operate proper-
ly. By applying a FORCE to the appropriate points as specified,
the output device operation is verified.
To test the unit, perform the steps in the following sections.
Specific tests are used to test each control sequence.
PREPARE UNIT
1. Connect the communication cable from the computer to
the SRVC port (J3) of the control module.
2. Connect the appropriate power source to the unit. Apply
power to the unit and set the disconnect switch (if sup-
plied) to ON. Verify that the red LED on the control mod-
ule begins to flash on and off.
3. Using the software, select the fan coil unit at the default
address (0,1). All the following tests are done with the
software.
TEMPERATURE SENSOR INPUT TEST — FromthePoints
Display screen, verify the Space (Return Air) Temperature
(RAT) and the Supply Air Temperature (SAT) are reading a
value equal to the ambient temperature.
SUPPLY FAN TEST
NOTE: If a T57 sensor is being used with this application, the
fan speed selector on the sensor must be in the AUTO position
while performing this test.
1. From the Points Display screen, highlight the Remote
Start (REMOTE) point. Force the Remote Start point to
ON. Verify that the fan starts.
2. From the Maintenance screen, select the FCMAINT
display.
3. Select the T57 Status point and force this value to 0.
Verify that the supply fan stops.
4. Select the T57 Status point and force this value to 1.
Verify that the supply fan runs at Low speed.
5. Select the T57 Status point and force this value to 2.
Verify that the supply fan runs at Medium speed.
6. Select the T57 Status point and force this value to 3.
Verify that the supply fan runs at high speed. (Continue to
the next test with the fan operating at high speed.)
MODULATING VALVE TEST (4-Pipe Heating/Cooling,
Cooling Only, and 2-Pipe Changeover Units)
NOTE: This test should be performed with the unit power on
and the supply fan running at high speed. If the fan is not run-
ning, refer to the Supply Fan Test section above to start the fan.
1. From the Points display screen select the VALVE/DX2
(CCV2) output. Force this point to OFF.
2. Select the VALVE/DX1 (CCV1) point. Force this point to
ON.
3. Verify that the water valve is opening or open.
4. Force the VALVE/DX1 (CCV1) point to OFF. The valve
should stop opening and hold its position.
5. Select the VALVE/DX2 (CCV2) output. Force this
point to ON.
6. Verify that the water valve closes.
MODULATING HEATING VALVE TEST (4-Pipe Heating/
Cooling, and Heating Only Units)
NOTE: This test should be performed with the unit power on
and the supply fan running at high speed. If the fan is not run-
ning, refer to the Supply Fan Test section above to start the fan.
1. From the Points display screen select the HEATING2
(HCV2) output. Force this point to OFF.
2. Select the HEATING1 (HCV1) point. Force this point
to ON.
3. Verify that the hot water valve is opening or open.
4. Force the HEATING1 (HCV1) point to OFF. The
valve should stop opening and hold its position.
5. Select the HEATING2 (HCV2) output. Force this
point to ON.
6. Verify that the water valve closes.
DIECT EXPANSION (DX) COOLING TEST
NOTE: This test should be performed with the unit power on
and the supply fan running at high speed. If the fan is not run-
ning, refer to the Supply Fan Test section above to start the fan.
1. Select the VALVE/DX1 (CCV1) point. Force this
point to ON.
2. Verify that the DX relay is energized.
3. Force the VALVE/DX1 (CCV1) point to OFF.
4. Verify that the DX relay is deenergized.

19
ELECTRIC HEAT TEST (Single-Stage Heat)
NOTE: This test should be performed with the unit power on
and the supply fan running at high speed. If the fan is not run-
ning, refer to the Supply Fan Test section on page 18 to start
the fan.
1. From the Points display screen select the HEATING1
(HCV1) output. Force this point to ON.
2. Verify that the first stage of electric heat is energized
and the supply air temperature rises.
3. Force the HEATING1 (HCV1) point to OFF.
4. Verify that the first stage of electric heat is deenergized.
ELECTRIC HEAT TEST (Two-Stage Heat)
NOTE: This test should be performed with the unit power on
and the supply fan running at high speed. If the fan is not run-
ning, refer to the Supply Fan Test section on page 18 to start
the fan.
1. From the Points display screen select the HEATING1
(HCV1) output. Force this point to ON.
2. Verify that the first stage of electric heat is energized
and the supply air temperature rises.
3. Select the HEATING2 (HCV2) output. Force this
point to ON.
4. Verify that the secondstage of electric heat is energized.
5. Force the HEATING2 (HCV2) point to OFF.
6. Verify that the second stage of electric heat is deenergized.
7. Force the HEATING1 (HCV1) point to OFF.
8. Verify that the first stage of electric heat is deenergized.
WALL-MOUNTED T56 SPACE TEMPERATURE
SENSOR TEST
NOTE: This test should be performed with the unit power on
and the supply fan running at high speed. If the fan is not run-
ning, refer to the Supply Fan Test section on page 18 to start
the fan.
1. Go to the Maintenance screen.
2. Go the FCMAINT screen.
3. View the Set Point Offset (T56OFF) point.
4. Move the slide bar adjustment on the sensor to the full
left position. Verify on the display screen that the tem-
perature reset value changes to –2.
5. Move the slide bar adjustment on the sensor to the full
right position. Verify on the display screen that the
temperature reset value changes to 2.
WALL-MOUNTED T57 SPACE TEMPERATURE
SENSOR TEST
NOTE: This test should be performed with the unit power on
and the supply fan running at high speed. If the fan is not run-
ning, refer to the Supply Fan Test section on page 18 to start
the fan.
1. Set the fan speed selector switch on the sensor to the
Off position.
2. Go to the Maintenance screen.
3. Go the FCMAINT screen.
4. Select the T57 Status point.
5. Remove the FORCE from this point (select AUTO).
Verify that the fan stops.
6. Move the fan speed selector switch on the sensor to the
High position. The fan will start to switch to high
speed. Verify that the fan is operating at High speed
after 10 seconds.
7. Move the fan speed selector switch on the sensor to the
Medium position. Verify that the fan is operating at
Medium speed.
8. Move the fan speed selector switch on the sensor to the
Low position. Verify that the fan is operating at Low
speed.
9. View the Set Point Offset (T56OFF) point.
10. Move the slide bar adjustment on the sensor to the full
left position. Verify on the display screen that the tem-
perature reset value changes to –2.
11. Move the slide bar adjustment on the sensor to the full
right position. Verify on the display screen that the
temperature reset value changes to 2.
CHANGEOVER SENSOR TEST (2-Pipe Units Only)
1. Go to the Maintenance screen.
2. Go the FCMAINT screen.
3. View the Changeover Temperature (CHGTEMP) sta-
tus point.
4. Verify that the temperature reading is equal to ambient
temperature.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 201 Catalog No. 534-231 Printed in U.S.A. Form 42-1SI Pg 20 12-00 Replaces: New
Book 3
Ta b 7 a
Copyright 2000 Carrier Corporation