773-209

This high-performance single-port air pressure switch is a vital safety component for residential gas furnaces and HVAC heating systems. Functioning as an air-proving switch, it monitors the vacuum pressure generated by the draft inducer motor to ensure that combustion gases are being safely and effectively exhausted from the unit. Calibrated to a precise -0.70" WC (Water Column) set point, this switch prevents the furnace burner from igniting if it detects restricted airflow or venting issues. If your heating system is failing to start, cycling improperly, or displaying airflow-related error codes, this pressure sensor is a reliable solution for restoring safe operation and efficient performance. Built for durability and precision, it serves as a critical fail-safe to protect your home and heating equipment.
Type: Air Pressure Switch
Size: Standard
Application: Used in residential gas furnaces and induced-draft heating systems to verify proper venting and airflow before allowing the ignition sequence to begin.
Specifications: Single port configuration, -0.70" WC trip point, normally open contacts, air-proving functionality.