Description
The York S1-02439713000 Pressure Switch is a differential air pressure component used to verify proper inducer airflow before allowing burner operation in HVAC systems. It is calibrated to a 1.1″ water column set point, meaning it closes its contacts sufficient draft or pressure is generated by the inducer motor. Installed in furnaces and packaged heating equipment it connects to sensing tubes that monitor combustion air movement, ensuring secure venting conditions and preventing ignition if airflow is restricted or the exhaust path is blocked.
