Installing Indoor Temperature Sensors - Lennox ComfortSense 8500 Installation And Setup Manual

Installing Indoor Temperature Sensors

Wire external sensors as illustrated below. Up to nine sensors may be used in averaging sensor applications.
Use Lennox catalog numbers 10kΏ (47W37) or 11kΏ (94L61). Sensors are not polarity sensitive.
Figure 4. Temperature Sensor Wiring (parallel)
The CS8500 will calculate the average temperature readings from all connected external temperature
sensors. If any of the sensors malfunction, they may still report a temperature value. Only when the average
value of the connected temperature sensors including any malfunction sensor(s) is lower than -40°F, or
higher than 158°F, will the CS8500 determine that an external temperature sensor(s) has failed and switch
automatically to the CS8500's internal temperature sensor. A error message will be displayed on the home
screen and under notification screen indicating an "external temperature sensor" error.
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