773-304

This high-performance two-stage air pressure switch is a critical safety component designed for high-efficiency gas furnaces. Functioning as an air proving switch, it monitors the vacuum pressure created by the draft inducer motor to ensure proper venting of combustion gases before the ignition sequence begins. Specifically engineered for two-stage heating systems, this switch features dual setpoints to manage both low and high-fire operations. If the venting system becomes obstructed or the inducer motor fails to maintain the required pressure, this switch prevents the furnace from firing, protecting your home from potential safety hazards. It is an essential replacement part for HVAC systems experiencing ignition failure, frequent cycling, or pressure switch lockout codes.
Type: Air Pressure Switch
Size: Standard HVAC pressure switch
Application: Two-stage residential gas furnaces and HVAC heating systems.
Specifications: Two-stage operation; Setpoints: -0.60" WC and -0.90" WC; SPST (Single Pole Single Throw) configuration; Air proving safety functionality.