773-044

This premium two-stage air pressure switch is a critical safety component designed for high-efficiency gas furnaces and HVAC systems. Functioning as an air-proving switch, it monitors the vacuum pressure generated by the draft inducer motor to ensure proper venting of combustion gases. With precise set points of 0.18" WC and 0.27" WC, this dual-stage sensor ensures the heating system only ignites when the correct airflow is established for both low and high-heat cycles. Replacing a malfunctioning pressure switch is essential for restoring furnace reliability, preventing ignition lockouts, and ensuring the safe operation of your residential heating equipment.
Type: Air Pressure Switch / Air Proving Sensor
Size: Small
Application: Used in two-stage residential gas furnaces and HVAC units to monitor combustion blower airflow and ensure safe exhaust venting.
Specifications: Dual-stage operation; Set points: 0.18" WC (Water Column) and 0.27" WC; Monitors inducer motor pressure; Safety interlock for furnace ignition sequences.