MARS 43346 Pressure Switch 318518-761 verify that the 24VAC transformer

verify that the 24VAC transformer and flame sensor are within spec to prevent premature board failure

Is this switch compatible with my York furnace

While a 4PDT can technically handle the functions of 2PDT or 3PDT relays

this electromechanical safety switch monitors the net oil pressure—the critical difference between oil pump discharge and crankcase pressure—to prevent catastrophic mechanical failure

MARS 43346 Pressure Switch 318518-761 verify that the 24VAC transformerThe MARS 43346 Pressure Switch is a heavy duty Single Pole Single Throw (SPST) low pressure control designed for demanding HVAC and refrigeration applications. Engineered for precision and longevity, this automatic reset pressure switch features a fixed setpoint configured to open on a pressure drop at 25 PSI and close on a rise at 50 PSI. The MARS 43346 is a versatile HVAC low pressure switch compatible with a wide voltage range from 24V to 250V,