773-085

The Lennox Calibration Pressure Switch (0.27" WC) is a vital safety component designed for high-efficiency gas furnaces and HVAC heating systems. As an air proving switch, its primary function is to monitor the pressure differential created by the draft inducer motor, ensuring that the exhaust system is clear and functioning correctly before allowing the furnace to ignite. If the venting system is obstructed or the inducer fails to move enough air, this switch acts as a failsafe to prevent unsafe operation. Engineered for precision and reliability, this factory-calibrated pressure switch helps maintain the efficiency of your heating unit while protecting your home from potential exhaust hazards. It is a common replacement part for HVAC systems requiring a specific 0.27-inch water column sensitivity.
Type: Air Pressure Switch
Size: Compact
Application: Gas furnaces, forced air heating systems, and residential HVAC equipment.
Specifications: 0.27" WC (Water Column) set point, air proving functionality, safety-critical vacuum sensing.