773-136

This high-quality 2-stage air pressure switch is a vital safety component for high-efficiency gas furnaces and residential HVAC systems. Designed to monitor the negative pressure created by the inducer blower motor, this air proving switch ensures that the heating system has proper airflow and venting before allowing the ignition process to begin. With dual-stage calibration at -0.25" WC and -0.40" WC, it provides precise draft detection to prevent the furnace from operating under unsafe conditions, such as a blocked flue or a failing vent motor. If your heating unit is cycling incorrectly or failing to ignite due to pressure switch error codes, this replacement part is essential for restoring reliable, energy-efficient performance to your dual-stage furnace.
Type: Air Pressure Switch
Size: Standard HVAC Component
Dimensions: unknown × unknown × unknown
Application: Used in two-stage gas furnaces and high-efficiency residential heating systems to ensure proper combustion airflow and venting safety.
Specifications: Dual-stage operation; Setpoints: -0.25" WC (Water Column) and -0.40" WC; Air proving functionality for draft inducer monitoring.