Icp Heil-Quaker 3900020801 Air Sensor

The Icp Heil-Quaker 3900020801 Air Sensor is a sensing component used to monitor air conditions and relay readings to the control circuitry for proper system regulation. It is positioned in air handling sections or duct pathways where it can detect airflow or temperature changes depending on system configuration. It is found in residential and light commercial HVAC systems where accurate air is required for coordinated operation of equipment. The sensor communicates with the control board to support system adjustments based on changing air conditions across different operating stages, ensuring the equipment responds appropriately within defined operating limits.