773-398

This premium Air Pressure Switch is a vital safety component designed for high-efficiency gas furnaces and HVAC systems. As a Single Pole Single Throw (SPST) air proving switch, it plays a critical role in monitoring the pressure differential created by the draft inducer motor. By sensing a 0.80" WC (Water Column) pressure threshold, it ensures that your heating system has established proper airflow and venting before allowing the ignition sequence to proceed. If your furnace is cycling incorrectly or failing to ignite due to a pressure sensor error, this replacement part provides the precision and reliability needed to restore safe and efficient operation. Engineered for durability, it helps protect against hazardous exhaust buildup by confirming that the venting system is functioning correctly.
Type: Air Pressure Switch / Air Proving Switch
Size: Compact
Application: Used in residential and commercial gas-fired furnaces, air handlers, and forced-air heating systems to monitor inducer motor performance and flue venting safety.
Specifications: Switch Logic: SPST (Single Pole Single Throw); Actuation Setpoint: 0.80" WC (Water Column); Function: Air Proving/Safety Interlock.