Description
The York S1-02435261000 SPNO Air Pressure Switch is a sensing control used to monitor airflow conditions within system circuits. It operates as a single pole normally open (SPNO) switch that closes when pressure falls to 1 inch water column, sending an electrical signal to the control circuit. This component is commonly applied in furnaces, air handlers, and other HVAC systems where airflow verification is required for safe sequencing. It is connected through sensing ports or tubing to detect pressure changes and translate them into switching action during equipment operation cycles.
