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SPACE TEMPERATURE SENSOR INSTALLATION AND
WIRING
The SPT sensor accessory is ordered separately for field-in-
stallation. It is installed on interior walls to measure room
space air temperature. See Fig. 15-19 and Table 8.
The wall plate accommodates both the NEMA (National
Electrical Manufacturing Association) standard and the Euro-
pean
1
/
DIN standard. The use of a junction box to accom-
4
modate the wiring is recommended for installation. The sen-
sor may be mounted directly on the wall, if acceptable by lo-
cal codes.
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 or radiators. Sensors
mounted in those areas will produce inaccurate readings.
Avoid corner locations. Allow at least 3 ft between the sensor
and any corner. Air in corners tends to be stagnant resulting in
inaccurate sensor readings.
Sensor should be mounted approximately 5 ft up from the
floor, in an area that best represents the average temperature
found in the space (zone).
The space temperature sensor cover includes a service jack
connector. If wiring connection is made to the service jack,
the connector can then be used to connect a network service
tool with the Carrier Comfort Network
Before installing the space temperature sensor, decide wheth-
er or not the service jack wiring connection will be made. If
connection is desired, the CCN communication cable should
be available at time of sensor installation, for convenient wir-
ing connections. The cable selected must meet the require-
ments for the entire network. See page 17 for CCN communi-
cation cable specifications.
Install and wire the space temperature sensor as follows:
NOTE: Space temperature sensor will be identified as T55 or
T56. Refer to Control Sequence drawings to determine which
SPT is part of the particular control package being installed.
(The difference between T55 and T56 is that T56 includes set
point adjustment capability.)
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.
6.
Use 20 gage wire to connect the sensor to the controller.
This size 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 adjust-
ment (slide-bar) is not required, then an unshielded, 18 or
20 gage, two-conductor, twisted pair cable may be used.
Refer to Table 9.
The CCN network service jack requires a separate,
shielded CCN communication cable. Always use sepa-
rate cables for CCN communication and sensor wiring.
(Refer to Fig. 18 and 19 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 counter-
clockwise until the cover is secured to the mounting plate
and locked in position.
®
system.
13
8.
For more sensor information, see Table 8 for thermistor
resistance vs temperature values.
NOTE: Clean sensor with damp cloth only. Do not use solvents.
Table 9 — Recommended Sensor and Device Wiring
MANUFACTURER
Belden
Columbia
American
Quabik
Alpha
Manhattan
NOTE: Wiring is 20 gage, 2 conductor twisted cable.
WIRING THE SPACE TEMPERATURE SENSOR AND
SET POINT ADJUSTMENT SLIDEBAR
To wire the sensor and slidebar, perform the following (see
Fig. 18 and 19):
1.
Identify which cable is for the sensor wiring.
2.
Strip back the jacket from the cables for at least 3 inches.
Strip
/
-in. of insulation from each conductor. Cut the
1
4
shield and drain wire from the sensor end of the cable.
3' (MIN)
5'
OR
2/3 OF WALL HEIGHT
Fig. 15 — Typical Space Temperature Sensor
Room Location
Cool
Fig. 16 — Space Temperature Sensor
(P/N 33ZCT56SPT Shown)
PART NUMBER
Regular
Plenum
8205
88442
D6451
—
A21501
A48301
6130
—
1895
—
M13402
M64430
D
Warm
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