Lochinvar & A.O. Smith 100187859 Switch 322838-754 How do I test the

How do I test the York S1-024-35272-000 with a multimeter

effectively breaking the circuit at a fixed open temperature of 140°F

or "wavering" flames that indicate the internal venturi or burner ports are compromised

ensuring the pneumatic controller maintains precise output

Lochinvar & A.O. Smith 100187859 Switch 322838-754 How do I test theThe Lochinvar & A. O. Smith 100187859 Switch is a critical 2. 0" blocked outlet switch designed for high efficiency gas fired commercial water heaters and boilers. As a genuine OEM replacement part, this pressure switch is calibrated to detect vent obstructions, ensuring the system shuts down safely if exhaust gases cannot be properly expelled. It is commonly utilized in A. O. Smith Cyclone BTH 300A series and comparable Lochinvar Power Fin models.