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This dual 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 pressure differential created by the draft inducer blower, ensuring that the combustion process only begins when the system detects proper airflow and venting. Featuring two precise set points at 1.05" WC and 0.40" WC, this switch helps prevent hazardous conditions such as gas buildup or improper exhaust. If your heating system is failing to ignite, cycling incorrectly, or shutting down shortly after startup, a malfunctioning air pressure switch may be the cause. Replacing this part helps restore reliable furnace operation and maintains the safety and efficiency of your residential or light commercial heating unit.
Type: Air Pressure Switch
Size: Standard HVAC component
Application: Used in multi-stage gas furnaces and HVAC heating systems to prove draft inducer airflow and ensure safe ignition sequences.
Specifications: Dual-stage set points: 1.05" WC (Water Column) and 0.40" WC; designed for air proving applications in forced-air heating systems.