Auxiliary Temperature Sensors

The lower auxiliary air temperature sensor provides the rear auxiliary HVAC control assembly with the temperature of the heat in the ductwork. A 5-volt reference signal is sent over the lower auxiliary air temperature sensor signal circuit to the sensor. That varied reference signal is sent back to the rear auxiliary HVAC control assembly over the low reference circuit.

The upper auxiliary air temperature sensor provides the rear auxiliary HVAC control assembly with the temperature of the A/C in the ductwork. A 5-volt reference signal is sent over the upper auxiliary air temperature signal circuit to the sensor. That varied reference signal is sent back to the rear auxiliary HVAC control assembly over the low reference circuit.