773-133

This premium 2-stage air pressure switch is a vital safety component for high-efficiency gas furnaces. Functioning as an air-proving sensor, it monitors the pressure generated by the inducer motor to ensure harmful combustion gases are being properly vented before the ignition sequence begins. Designed for multi-stage heating systems, this switch helps prevent hazardous conditions and ensures peak operating efficiency. If your furnace is experiencing startup failures or venting errors, this dual-setpoint pressure switch provides the reliable air pressure monitoring needed for safe, consistent heating performance.
Type: Air Pressure Switch
Size: Standard Replacement Part
Application: High-efficiency 2-stage gas furnaces and residential HVAC heating systems requiring dual-stage airflow verification.
Specifications: Dual-stage operation; Calibrated setpoints: 0.50" WC (Water Column) and 0.85" WC; Monitors inducer blower motor pressure for safety cut-off.