Aaon P59920 Pressure Switch R-407A the York S1-025-38252-000 is designed

the York S1-025-38252-000 is designed to handle the 2-wire configurations typically found in 24V heating systems and specific millivolt applications

the internal bimetal disc has failed or the switch is stuck open

The seat is strategically positioned above the drain to prevent sediment accumulation

the coil is rated for high-temperature environments

Aaon P59920 Pressure Switch R-407A the York S1-025-38252-000 is designedThe Aaon P59920 Pressure Switch is a high performance HVAC high pressure cutout switch engineered specifically for technical reliability in demanding commercial environments. This Aaon OEM replacement part features a precise manual reset (M R) mechanism set to trigger at 420 PSI, providing a critical layer of safety for refrigeration circuits. Designed as a high limit safety control, the high pressure switch 420# protects your system by interrupting