773-137

This premium air pressure switch is a critical safety component designed for gas furnaces and HVAC heating systems. As an essential air-proving switch, it monitors the negative pressure generated by the inducer motor to ensure that combustion gases are being safely and effectively exhausted from the system. Calibrated to a precise -0.90" WC set point, this switch prevents the furnace from igniting if it detects an obstruction in the flue or a failure in the venting process. It is a common replacement part for resolving furnace ignition failures, safety lockout codes, and heating system malfunctions. Engineered for reliability and high-heat tolerance, this switch ensures your heating equipment operates at peak safety and efficiency.
Type: Air Pressure Switch
Size: Small
Application: Gas-fired residential furnaces, HVAC air handlers, and forced-air heating systems requiring air-proving safety controls.
Specifications: Pressure Set Point: -0.90" WC (Water Column); Function: Inducer Draft Monitoring; Application: Air Proving and Safety Limit Control.