Table 2 — Color Code Recommendations
SIGNAL TYPE | CCN BUS WIRE | CCN PLUG PIN | |
COLOR | NUMBER | ||
| |||
+ | Red | 1 | |
Ground | White | 2 | |
– | Black | 3 |
Install Sensors (See Fig.
NOTE: All sensors are
SPACE TEMPERATURE (SPT) SENSOR INSTALLA- TION — There are three types of SPT sensors available from Carrier: The 33ZCT55SPT space temperature sensor with timed override button, the 33ZCT56SPT space temperature sensor with timed override button and set point adjustment, and the 33ZCT58SPT T58 communicating room sensor with timed override button, set point adjustment, and manual fan control.
The space temperature sensors are used to measure the building interior temperature. The T58 communicating room sensors measure and maintain room temperature by communi- cating with the controller. Sensors should be located on an interior building wall. The sensor wall plate accommodates the NEMA (National Electrical Manufacturers Association) standard 2 x 4 junction box. The sensor can be mounted direct- ly 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
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. The SPT sensor wires are to be connected to terminals in the unit main control board.
Install the sensor as follows:
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.
NOTE: Sensor may also be mounted directly on the wall using 2 plastic anchors and 2 sheet metal screws
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
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. 5 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.
NOTE: See Table 3 for thermistor resistance vs temperature values.
Wiring the Space Temperature Sensor — To wire the sensor, perform the following (see Fig.
1.Identify which cable is for the sensor wiring.
2.Strip back the jacket from the cables for at least 3 inches.
Strip
3.Connect the sensor cable as follows:
a.Connect one wire from the cable to (BLU) wire on
b.Connect another wire from the cable to (BRN)
c.On 33ZCT56SPT thermostats, connect the remain- ing wire to the (BLK) STO on
d.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 PremierLink controller.
e.On 33ZCT56SPT thermostats install a jumper between the two center terminals (right SEN and left SET). See Fig. 4.
f.Refer to Fig. 5 for 33ZCT58SPT thermostat wir- ing. Once the T58 sensor is powered up, all of the graphic icons on the LCD (liquid crystal display) display will be energized for a few seconds. The graphical icons will then turn off and the T58 sen- sor will energize the
NOTE: See Fig. 6 for space temperature sensor averaging.
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