021-440

This Air Pressure Control Switch is a vital safety component for residential and commercial HVAC systems, including packaged gas and electric units. Functioning as an air proving switch, it monitors the pressure differential created by the draft inducer motor to ensure that combustion gases are being properly vented before the ignition process begins. This SPST (Single Pole Single Throw) switch is calibrated to a specific 0.20" WC (Water Column) set point, ensuring high sensitivity and reliable system monitoring. If your heating system fails to ignite or experiences intermittent shutdowns, a faulty air pressure switch is a common culprit. Replacing a malfunctioning switch is essential for maintaining the efficiency and safety of your furnace or rooftop unit.
Type: Air Pressure Switch / Air Proving Switch
Size: Small
Application: Used in residential and commercial HVAC units, gas-fired furnaces, and packaged heating/cooling systems to monitor draft inducer airflow.
Specifications: Configuration: SPST (Single Pole Single Throw); Set Point: 0.20" WC; Function: Air Proving/Safety Limit