773-041

The Lennox Calibration Pressure Switch is an essential safety component designed for high-efficiency gas furnaces and HVAC systems. This air proving switch is engineered to monitor the pressure within the combustion chamber, ensuring that the draft inducer motor is moving sufficient air to safely exhaust combustion gases. Calibrated to a precise 0.27" WC (Water Column) set point, this sensor acts as a critical fail-safe that prevents the heating cycle from continuing if improper venting or a blockage is detected. If your furnace is experiencing ignition failure or shut-offs due to pressure faults, this genuine calibration switch is a vital replacement part to restore reliable heating and maintain safe indoor air quality.
Type: Air Pressure Switch
Size: Small
Application: Gas furnaces, residential HVAC heating systems, and draft inducer motor assemblies.
Specifications: Pressure Setting: 0.27" WC (Water Column); Function: Air Proving and Combustion Safety; Component Type: Calibration Switch.