2
INSTALLATION
General —
The fan coil controller is connected to a wall-
mounted, field-supplied, space temperature sensor (SPT) in
order to monitor zone temperature changes and satisfy zone
demand.
On all heating or cooling applications, the fan coil controller
must be connected to a field-installed and -supplied supply air
temperature (SAT) sensor to monitor the temperature of the air
delivered by the fan coil.
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 or any device on the system.
See Fig. 1.
Fan Coil Controller Hardware —
The fan coil con-
troller consists of the following hardware:
• control module
• plastic enclosure
• two no. 8 x
1
/
2
-in. sheet metal screws (for fan coil con-
troller mounting to fan coil)
Figure 2 shows the fan coil controller physical details.
Field-Supplied Hardware —
Each fan coil controller
requires the following field-supplied components to complete
its installation:
• fan coil unit
• space temperature sensor (33ZCT55SPT, 33ZCT56SPT,
or 33ZCT57SPT)
• transformer — 24 vac, 40 va (standard applications)
• changeover sensor (required for 2-pipe applications)
• contactors (as required for fan, electric heat, or DX cool-
ing)
• supply air temperature sensor (33ZCSENSAT) with two
no. 10 x
1
/
2
-in. sheet metal screws (to secure SAT sensor
to fan coil unit)
• indoor air quality sensor (as required)
• relative humidity sensor (as required)
• valve and actuator for hot water heat or chilled water (as
required)
• linkage thermostat (as required)
SPACE TEMPERATURE SENSOR — Each fan coil con-
troller requires a field-supplied Carrier space temperature sen-
sor. There are three sensors available 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
SUPPLY AIR TEMPERATURE
(SAT) SENSOR — The
fan coil controller must be connected to a field-supplied supply
air temperature (SAT) sensor (part number 33ZCSENSAT) 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.
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. Thermostat functions include space
temperature sensing, remote set point adjustment, and occu-
pancy information. The linkage thermostat can be used in place
of any space temperature sensor. If fail-safe operation is re-
quired, it is recommended to also install a 33ZCSENSAT in the
return air duct of each unit, wired to the space temperature sen-
sor input of the fan coil controller.
RELATIVE HUMIDITY SENSOR — The 33AMSENRHS000
relative humidity sensor is an indoor, wall-mounted sensor and
is required for zone humidity control (dehumidification).
INDOOR AIR QUALITY (CO
2
) SENSOR — An indoor air
quality sensor is required for IAQ monitoring. Three different
CO
2
sensors are available for zone CO
2
level monitoring.
The 33ZCSENCO2 sensor is an indoor, wall mounted sen-
sor with an LED (light-emitting diode) display.
The 33ZCT55CO2 sensor is an indoor, wall mounted sen-
sor without display. The CO
2
sensor also includes a space tem-
perature sensor with override button.
The 33ZCT56CO2 sensor is an indoor, wall mounted sen-
sor without display. The CO
2
sensor also includes a space tem-
perature sensor with override button and temperature offset.
Mount Fan Coil Controller
LOCATION — The fan coil controller should be located in-
side one of the available service access panels of the fan coil
unit. The fan coil controller may also be mounted on the exteri-
or of the fan coil unit. Select a location which will be safe from
water damage and allow sufficient access for service and wir-
ing. For service access, there should be at least 6 in. of clear-
ance between the front of the fan coil controller and adjacent
surfaces. Refer to Fig. 3.
MOUNTING — Mount the fan coil controller to the desired
location by holding the fan coil controller in place and screw-
ing two no. 8, pan-head, Phillips, sheet metal screws provided
through two of the holes available in the plastic base on the
either side of the fan coil controller.
