773-310

This high-performance dual-stage air pressure switch is a critical safety component designed for residential gas furnaces. As an essential air proving sensor, it monitors the vacuum pressure generated by the draft inducer motor to ensure that combustion gases are safely and efficiently vented through the flue. Specifically engineered for two-stage heating systems, this switch features dual setpoints of -0.30" WC and -0.45" WC to verify proper airflow during both low-fire and high-fire operation. By detecting venting obstructions or motor failures, this component prevents the furnace from igniting under unsafe conditions, protecting your HVAC equipment and home. This reliable replacement part is key to troubleshooting furnace startup issues and maintaining peak heating performance.
Type: Air Pressure Switch
Size: Small
Application: Used in two-stage gas furnaces and residential HVAC systems to monitor combustion air flow and draft inducer performance.
Specifications: Two-stage operation; Setpoints: -0.30" WC (Water Column) and -0.45" WC; Function: Air proving and safety lockout.