773-166

This 2-stage air pressure switch is a critical safety component designed for high-efficiency HVAC systems and gas furnaces. As an air proving switch, it monitors the pressure differential created by the draft inducer motor to ensure that combustion gases are being safely vented. Featuring a calibrated 0.30" WC (Water Column) set point, this switch prevents the furnace from entering the ignition cycle if it detects insufficient airflow or a venting blockage. It is an essential replacement part for restoring the reliable operation of multi-stage heating units, helping to prevent common pressure-related fault codes and ensuring safe, consistent performance throughout the heating season.
Type: Air Pressure Switch
Size: Small
Application: Used in high-efficiency 2-stage residential gas furnaces and HVAC air handlers to monitor inducer motor draft and venting safety.
Specifications: 2-Stage operation, 0.30" WC (Water Column) pressure set point, air proving functionality.