773-125

This premium two-stage air pressure switch is an essential safety component for high-efficiency residential gas furnaces and HVAC systems. Designed to monitor the pressure differential generated by the draft inducer motor, this air proving switch ensures that exhaust gases are being safely and effectively vented before the ignition sequence begins. Engineered for two-stage heating systems, it features dual calibration points at 0.60" WC and 1.05" WC to accurately sense airflow during both low-fire and high-fire operation cycles. This reliable replacement part helps resolve common heating issues such as failure to ignite, intermittent operation, or system lockout due to pressure switch fault codes, restoring the safety and efficiency of your furnace.
Type: Air Pressure Switch
Size: Standard
Application: Designed for use in two-stage gas furnaces and HVAC heating equipment to monitor venting pressure and ensure proper draft inducer performance.
Specifications: Two-stage operation; Low-stage activation: 0.60" WC; High-stage activation: 1.05" WC; Purpose-built for air proving and combustion safety monitoring.