773-067

This Lennox 2-stage air pressure switch is an essential safety and performance component for high-efficiency gas furnaces and HVAC systems. Designed as an air proving switch, it monitors the pressure differential created by the inducer motor to ensure combustion gases are being safely exhausted. Featuring dual setpoints at 1.00" WC and 0.25" WC, this switch is specifically engineered for two-stage heating applications, allowing the system to verify proper airflow at both low and high heat cycles. If the switch detects a venting blockage or mechanical failure, it safely interrupts the ignition sequence to prevent hazardous operation. This durable replacement part is vital for restoring the reliability and efficiency of residential heating equipment.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Commonly used in two-stage gas furnaces to monitor pressure differentials and prove airflow for safe combustion and venting.
Specifications: Dual-stage operation; Setpoints: 1.00" WC (Water Column) and 0.25" WC (Water Column); Air proving safety functionality.