773-335

This premium Lennox pressure switch is a vital safety component for residential and commercial HVAC systems. As a single-port air proving switch, it plays a crucial role in the furnace ignition sequence by monitoring the pressure differential created by the draft inducer motor. With a precision-calibrated 0.43" WC (Water Column) set point, this SPST (Single Pole Single Throw) switch ensures that flue gases are being properly vented before the burner is allowed to ignite. If your heating system is experiencing ignition failure or displaying pressure switch error codes, this replacement part is essential for restoring safe and efficient furnace operation. Designed for durability and precision, it serves as a reliable solution for heating system repairs and routine maintenance.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Used in forced-air furnaces and HVAC heating units as a safety sensor to prove airflow and vent pressure before ignition.
Specifications: Single Port, 0.43" WC Set Point, SPST (Single Pole Single Throw) Switch Configuration