Aprilaire 8570 230.6, 163.8, 117.6, 85.4, 62.6, 46.3, 34.6, 26.1, 19.9, 15.3, 11.9, 100

2. Run a 2-wire cable from the sensor to the thermostat.

CAUTION

Do not run the wire along side line voltage (120 VAC) or higher lines as this can cause erratic readings.

3.Take a resistance measurement before connecting to the ODT and CIR GND terminals to verify the sensor is properly installed. Measure the wires at the thermostat to account for wire splices.

•Use an ohmmeter to measure the resistance (kΩ) of the sensor. The resistance reading will depend on the outdoor temperature (see table).

4.Wire the sensor to the thermostat (see Figure 8).

•Strip 1/4" of insulation from the two sensor wires.

•Connect the sensor wires to the ODT and CIR GND terminals of the thermostat. The wiring is not polarity sensitive, so either wire can be connected to either thermostat terminal.

OUTDOOR TEMPERATURE (°F)	RESISTANCE (kΩ)
-30	230.6
-20	163.8
-10	117.6
0	85.4
10	62.6
20	46.3
30	34.6
40	26.1
50	19.9
60	15.3
70	11.9
80	9.4
90	7.4
100	5.9

Figure 8

90-1025

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