Carrier 33ZCFANTRM Installation, Start-up And Service Instructions Manual

Also see for 33ZCFANTRM: Mounting instructions

Carrier 33ZCFANTRM Installation, Start-up And Service Instructions Manual Manual pdf 19 page image

19Install SensorsSPACE TEMPERATURE SENSOR INSTALLATION —A space temperature sensor must be installed for each zonecontroller. There are three types of SPT sensors available fromCarrier: the 33ZCT55SPT space temperature sensor with timedoverride button, the 33ZCT56SPT space temperature sensorwith timed override button and set point adjustment and the33ZCT58SPT with liquid crystal display. See Fig. 10.The space temperature sensor is used to measure the build-ing interior temperature and should be located on an interiorbuilding wall. The sensor wall plate accommodates the NEMAstandard 2 x 4 junction box. The sensor can be mounted direct-ly on the wall surface if accpectable by local codes.Do not mount the sensor in drafty locations such as near airconditioining 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 whichmay be opened, near a wall corner, or a door. Sensors mountedin these areas will have inaccurate and erratic sensor readings.The sensor should be mounted approximately 5 ft from thefloor, in an area representing the average temperature in thespace. Allow at least 4 ft between the sensor and any cornerand mount the sensor at least 2 ft from an open doorway.Install the sensor as follows (see Fig. 11):1. Locate the two Allen type screws at the bottom of thesensor.2. Turn the two screws clockwise to release the coverfrom the sensor wall mounting plate.3. Lift the cover from the bottom and then release it fromthe top fasteners.4. Feed the wires from the electrical box through theopening in the center of the sensor mounting plate.5. Using two no. 6-32 x 1 mounting screws (providedwith the sensor), secure the sensor to the electrical box.6. Use 20 gage wire to connect the sensor to the control-ler. The wire is suitable for distances of up to 500 ft.Use a three-conductor shielded cable for the sensorand set point adjustment connections. The standardCCN communication cable may be used. If the setpoint adjustment (slidebar) is not required, then anunshielded, 18 or 20 gage, two-conductor, twisted paircable 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. 12 for wire terminations.)7. Replace the cover by inserting the cover at the top ofthe mounting plate first, then swing the cover downover the lower portion. Rotate the two Allen headscrews counterclockwise until the cover is secured tothe 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 usesolvents.Wiring the Space Temperature Sensor (33ZCT55SPT and33ZCT56SPT) — To wire the sensor, perform the following(see Fig. 12 and 13):1. Identify which cable is for the sensor wiring.2. Strip back the jacket from the cables for at least3-inches. Strip 1 /4-in. of insulation from each conduc-tor. Cut the shield and drain wire from the sensor endof the cable.3. Connect the sensor cable as follows:a. Connect one wire from the cable (RED) to theSPT terminal on the controller. Connect the otherend of the wire to the left terminal on the SEN ter-minal block of the sensor.b. Connect another wire from the cable (BLACK) tothe GND terminal on the controller. Connect theother end of the wire to the remaining open termi-nal on the SEN terminal block.c. On 33ZCT56SPT thermostats, connect the re-maining wire (WHITE/CLR) to the T56 terminalon the controller. Connect the other end of thewire to the right most terminal on the SET termi-nal block.d. In the control box, install a No. 6 ring type crimplug on the shield drain wire. Install this lug underthe mounting screw in the upper right corner ofthe controller (just above terminal T1).e. On 33ZCT56SPT thermostats install a jumperbetween the two center terminals (right SEN andleft SET).Wiring the Space Temperature Sensor (33ZCT58SPT) — TheT58 space temperature sensor is wired differently than otherconventional sensors. The T58 sends all its sensor informationthrough the CCN bus to the zone controller that is is associatedwith. The SPT sensor wiring connections are not used. The T58sensor does not need to be directly wired to the zone controller.The T58 sensor may be powered by a separate 24-VAC pow-er supply or may be connected to the J1 24 VAC power termi-nals on the zone controller. Be sure that the polarity of the powersupply connections are consistent. For multiple devices wired tothe same power supply, all positive (+) and negative (–) termi-nals should be wired in the same polarity.Wire the T58 sensor to the CCN. Connect the CCN + termi-nal to the RED signal wire (CCN+). Connect the CCN – termi-nal to the BLACK signal wire (CCN–). Connect the GNDterminal to the WHITE/CLEAR signal wire (Ground). Refer tothe T58 sensor Installation Instructions for more informationon installing and wiring the sensor.Wiring the CCN Network Communication Service Jack —See Fig. 12, 13, and 14. To wire the service jack, perform thefollowing:1. Strip back the jacket from the CCN communicationcable(s) for at least 3 inches. Strip 1/4 -in. of insulationfrom each conductor. Remove the shield and separatethe drain wire from the cable. Twist together all theshield drain wires and fasten them together using anclosed end crimp lug or a wire nut. Tape off anyexposed bare wire to prevent shorting.2. Connect the CCN + signal wire(s) (RED) toTerminal 5.3. Connect the CCN – signal wire(s) (BLACK) toTerminal 2.4. Connect the CCN GND signal wire(s) (WHITE/CLR)to Terminal 4.IMPORTANT: The T58 sensor must be configured withthe bus address and device type of the zone controllerbefore it will broadcast temperature to the zone control-ler. Refer to the T58 sensor Installation Instructions formore information on configuring the sensor.→→801