Description
The York S1-02435903000 SPNO Air Pressure Switch 0.45- 0.85″ WC On Pressure Fall is a control component designed to monitor air pressure changes within compatible heating and cooling equipment. The Single Pole Normally Open switch keeps the circuit open until the required pressure condition is detected, then closes to send a signal to connected controls. It connects with tubing, wiring, and control assemblies for pressure sensing and electrical switching. In HVAC systems, it communicates airflow and pressure status to connected parts, allowing safety and operating sequences to respond according to system conditions during equipment cycles.
