773-129

This premium 2-stage air pressure switch is a vital safety component designed for high-efficiency gas furnaces and HVAC systems. As a dual-stage air-proving switch, it monitors the negative pressure generated by the draft inducer motor to ensure the venting system is clear and functioning correctly before allowing the heating cycle to proceed. It features two specific set points to accommodate both low-fire and high-fire operations, making it essential for multi-stage heating equipment. If your furnace is experiencing ignition failure or cycling issues related to pressure switch lockout codes, this replacement part provides the precision and reliability needed to restore safe, consistent climate control. Built for durability and factory-calibrated for accuracy, it ensures your residential heating system operates at peak efficiency while maintaining strict safety standards.
Type: Air Pressure Switch
Size: Small
Application: Used in residential two-stage high-efficiency gas furnaces and HVAC heating systems to monitor flue gas exhaust and inducer motor draft pressure.
Specifications: 2-stage operation; High-fire set point: -0.70" WC; Low-fire set point: -0.40" WC; Air proving safety function; Differential pressure sensing.