York S1-024-35780-000 SPNO Air Pressure Switch
The York S1-024-35780-000 SPNO Air Pressure Switch is a control device designed to monitor airflow and pressure conditions in HVAC systems. It operates by closing a single-pole, normally open electrical circuit when the required air pressure is reached, ensuring proper system operation. Commonly used in furnaces, air handlers, and ventilation units, it verifies airflow before system startup. Its use enhances safety, improves system reliability, and helps prevent equipment damage, supporting efficient and consistent HVAC performance.