773-178

This premium York air pressure switch is a critical safety component designed for high-efficiency gas furnaces and HVAC systems. As an air proving switch, its primary function is to monitor the negative pressure created by the draft inducer motor, ensuring that combustion gases are safely vented out of the heat exchanger before the ignition sequence starts. If your heating system is experiencing startup failures or cycling issues related to airflow detection, replacing a faulty switch with this -0.85" WC rated component is essential for restoring reliable performance. Engineered for durability and precision, this part helps prevent furnace operation under unsafe conditions, protecting your home and maximizing equipment longevity.
Type: Air Pressure Switch
Size: Standard furnace component
Application: Used in residential and commercial gas furnaces and heating units to verify proper venting and blower operation during the ignition cycle.
Specifications: Pressure Setting: -0.85" WC (Water Column); Type: Air Proving Switch; Functionality: Diaphragm-actuated safety sensor