The sensor triggers at a 0

The thermostat features an onboard O/B terminal switch

including the popular S4A

While used across many York and Coleman models

York S1-026-32119-001 Pressure Switch Els PW 17895 The sensor triggers at aThe York S1 026 32119 001 Pressure Switch is a critical safety component designed for precise draft monitoring in York, Luxaire, and Coleman furnace systems. This OEM replacement pressure switch is factory calibrated to a 0. 40" WC (Water Column) setpoint, ensuring the inducer motor establishes the necessary vacuum for safe combustion before the ignition sequence begins. Featuring a Single Pole Single Throw (SPST) configuration, it provides a reliable