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T-55 SPACE TEMPERATURE SENSOR WITH OVERRIDE
T-56 Space Temperature Sensor WITH OVERRIDE & SETPOINT ADJUSTMENT
COMPONENT LIST
The Model T-55 Space Temperature Sensor with Override and T-56 Space Temperature Sensor
with Override & Setpoint Adjustment consists of the following components:
• (1) Space temperature sensor
• (2) 6-32" x 1" round head machine screws
LOCATING THE SENSOR
The T-55 and T-56 space temperature sensors measure 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 baseboard heaters, radiators, or directly above wall mounted lighting dimmers. Do
not mount the sensor near a window that may be opened, or near a wall corner or door. Sensors
mounted in these areas will have inaccurate and erratic sensor readings.
Mount the sensor 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.
Note: Clean sensor with damp cloth only. Do not use solvents.
TO INSTALL THE T-55 AND T-56 SENSOR
(See Figure 1 below)
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 opening in the center of the sensor mount-
ing plate.
808-255
02/00
INSTALLATION INSTRUCTIONS
1
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Summary of Contents for Carrier T-55
- Page 1 • (2) 6-32" x 1" round head machine screws LOCATING THE SENSOR The T-55 and T-56 space temperature sensors measure 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.
- Page 2 Using two no. 6-32 x 1 mounting screws (provided with the sensor) secure the sensor to the electrical box. 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 setpoint adjustment connections.
- Page 3 WIRING THE CCN NETWORK COMMUNICATION SERVICE JACK Wire Specifications The Carrier Comfort Network (CCN) Communication Bus wiring is field supplied and field in- stalled. It consists of shielded three-conductor cable with drain (ground) wire. The cable selected must be identical to the CCN Communication Bus wire that is being used for the entire network.
- Page 4 Table 1 Color Code Recommendations Signal Type CCN BUS Wire Plug Pin Color Number Ground White Black Note: The communication bus drain wires (shields) must be tied together at each controller. If the communication bus is entirely within one building, the resulting continuous shield must be connected to ground at only one single point.
- Page 5 Figure 2 T-55 Space Temperature Sensor Wiring RED(+) WHT(GND) CCN COM BLK(-) BLK (GND) SENSOR WIRING RED (SPT) Figure 3 T-56 Space Temperature Sensor Wiring RED(+) WHT(GND) CCN COM BLK(-) (T56) BLK (GND) SENSOR WIRING RED (SPT) JUMPER TERMINALS AS SHOWN...
- Page 6 Table 2 Thermistor Resistance vs Temperature Values for Space Temperature Sensor Temp Temp Resistance (Ohms) 335,651 242,195 176,683 130,243 96,974 72,895 55,298 42,315 32,651 25,395 19,903 15,714 12,494 10,000 8,056 6,530 5,325 4,367 3,601 2,985 2,487 2,082 1,752 808-255 02/00...
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