773-127

This premium Lennox 2-stage air pressure switch is a vital safety component designed for high-efficiency gas furnaces. As a critical air-proving device, it monitors the negative pressure created by the inducer blower motor to ensure the venting system is clear and operating safely before allowing the heating cycle to commence. This specific dual-stage switch features calibrated setpoints of -0.25" WC and -0.60" WC, making it essential for heating systems that utilize variable or two-stage heat outputs. If your furnace is failing to ignite or throwing a pressure switch lockout code, this high-quality replacement part ensures your HVAC system maintains peak efficiency and safety standards. Engineered for durability and precision, it helps prevent the operation of the burner under unsafe venting conditions, protecting both the equipment and the home.
Type: Air Pressure Switch
Application: Used in residential two-stage gas furnaces and HVAC heating systems to monitor combustion air pressure and ensure proper venting.
Specifications: Dual-stage operation; Setpoints: -0.25" WC (Water Column) and -0.60" WC; Air proving functionality; Differential pressure sensing.