773-339

This premium air pressure switch is a vital safety component designed for heating systems, specifically engineered to monitor airflow and ensure safe furnace operation. Calibrated to a precise 0.33" WC set point, this air proving switch detects whether the draft inducer motor is creating sufficient vacuum to safely exhaust flue gases. If the pressure falls outside the safe range due to a blocked vent or mechanical failure, the switch prevents the ignition cycle, protecting the system from overheating or gas buildup. This high-performance pressure switch is an essential replacement part for restoring the reliability of residential HVAC units and gas furnaces, helping to troubleshoot common ignition failures and intermittent heating issues.
Type: Air Pressure Switch
Size: Small
Application: Used in residential gas furnaces and HVAC heating systems to monitor draft inducer pressure and ensure proper venting before ignition.
Specifications: Pressure Setting: 0.33" WC (Water Column); Function: Air Proving and Safety Interlock; Component Type: Single Stage Air Pressure Sensing