Installation (continued)
4. Install and Wire the Discharge Air Temperature Sensor
CAUTION
As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.
CAUTION
Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch.
The tip of the sensor must be located in a region of fully mixed supply of air before the
a. Wire discharge air temperature probe to control panel using thermostat wire. Note that the temperature sensor is not polarity sensitive.
b. Be sure that the tip of the sensor is located at least 15 inches downstream from the leaving air side of the evaporator in the discharge plenum, and 1/3 of the depth (D/3) of the plenum (D) from the front of the plenum (the front is the side with the furnace or CB access doors), and centered side to side. Move the adjustable bracket along the length of the discharge air sensor to achieve proper sensor tip location (tip of sensor to be located at W ÷ 2). The sensor can be inserted from any side of the plenum, as long as the tip of the sensor is in the correct position. See Figure 3.
15" |
|
D/3 | W |
D |
|
| FRONT |
FIGURE 3 – DISCHARGE AIR SENSOR LOCATION
IMPORTANT: The discharge air sensor is required. If a short or open circuit is detected between the Plenum Sensor terminals, the control panel will only respond to Zone 1 and the dampers will stay in the open position.
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