773-043

This premium 2-stage air pressure switch is a critical safety component designed for high-efficiency gas furnaces and residential heating systems. As an essential air proving switch, it monitors the negative pressure generated by the draft inducer motor to ensure proper venting of combustion gases before and during the ignition cycle. Featuring dual setpoints at 0.20" WC and 0.45" WC, this component is specifically engineered for two-stage heating units, allowing for precise airflow verification during both low-fire and high-fire operations. If your furnace is failing to ignite or experiencing intermittent shut-offs, this reliable replacement pressure switch restores safe, efficient performance by ensuring the system only operates when optimal venting is detected.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Used in residential two-stage gas furnaces and HVAC equipment to monitor inducer blower pressure and prove airflow for safe combustion.
Specifications: Dual-stage operation; Setpoints: 0.20" WC and 0.45" WC (Water Column); Air proving safety functionality.