Description
The York S1-02435978000 Air Pressure Switch is a differential pressure sensing component calibrated to 0.67″ water column, used to detect proper airflow conditions within combustion or ventilation pathways. It responds to changes in static pressure by opening or closing an internal electrical contact when the set pressure threshold is reached. In HVAC systems, it is installed in a furnace or air-handling assemblies, where it verifies that the inducer motor is generating adequate draft before allowing ignition or continued operation. It ensure safe venting conditions by confirming sufficient airflow through the system’s exhaust and intake passages during each operating cycle.
