773-155

This premium air pressure switch is a critical safety component designed for high-efficiency HVAC systems and gas-fired furnaces. Functioning as an air proving switch, it monitors the negative pressure generated by the draft inducer motor to ensure that combustion gases are being safely exhausted before the ignition sequence is allowed to begin. If your heating system is failing to ignite or cycling off prematurely due to a pressure sensor error, this -0.40" WC (Water Column) switch is the ideal replacement to restore safe and reliable operation. Engineered for precision and durability, it helps maintain a secure environment by verifying proper airflow through the heat exchanger, preventing the operation of the burner under unsafe venting conditions.
Type: Air Pressure Switch / Air Proving Switch
Size: Standard
Application: Commonly used in residential gas furnaces, HVAC units, and forced-air heating systems to monitor vent blower draft and combustion safety.
Specifications: Pressure Set Point: -0.40" WC (Water Column); Sensor Type: Negative Pressure/Vacuum; Function: Safety Interlock for Inducer Draft Verification.