773-033

This premium dual-stage air pressure switch is a vital safety component for high-efficiency two-stage gas furnaces. Acting as a combustion air-proving sensor, it monitors the vacuum pressure created by the inducer motor to ensure flue gases are properly venting before allowing the ignition sequence to begin. It features dual setpoints specifically calibrated for low-fire and high-fire cycles, ensuring your HVAC system operates at peak safety and efficiency. Ideal for resolving common heating issues like ignition failure or pressure switch lockout codes, this replacement part provides reliable performance for multi-stage residential heating units.
Type: Air Pressure Switch
Size: Standard
Application: Specifically designed for use in two-stage gas furnaces and residential HVAC heating systems to monitor venting and combustion air flow.
Specifications: Dual-stage configuration; Low-stage setpoint: 0.70" WC; High-stage setpoint: 1.05" WC; differential pressure sensing; ensures proper inducer motor draft for safe ignition.