Under normal ambient conditions (above 40°F but below 50°F)

it prevents fire hazards by opening the primary winding if a secondary short circuit is sustained

ensuring a tight seal that prevents airborne contaminants from entering the reservoir while minimizing heat transfer

vibration-free installation

York S1-024-35979-000 Pressure Switch Under normal ambient conditions (aboveThe York S1 024 35979 000 Pressure Switch is a critical safety component engineered for York, Coleman, and Luxaire residential and commercial furnaces. This OEM furnace pressure switch is calibrated to a specific set point of 0. 15" WC (Water Column), featuring a Single Pole Normally Open (SPNO) configuration that is designed to close on a fall in pressure. As a veteran technician knows, this switch monitors the negative pressure generated by the