Lochinvar & A.O. Smith 100288429 Switch 322838-753 Zero Pressure Differential: The normally

Zero Pressure Differential: The normally closed design ensures the valve remains shut without requiring system pressure to maintain the seal

Most compatible hot surface ignitors should read between 40 and 60 ohms

this unit is engineered for systems utilizing R-22 refrigerant

Quick Field Replacement: Lightweight and rigid construction allows for rapid sliding exchanges during routine maintenance calls

it ensures stable circuit management under demanding industrial and residential conditions

Lochinvar & A.O. Smith 100288429 Switch 322838-753 Zero Pressure Differential: The normallyThe Lochinvar & A. O. Smith 100288429 Switch is a critical safety component designed for precise air pressure sensing in high efficiency heating systems. This OEM replacement part is factory calibrated to a 3. 90" water column (WC) set point, serving as a primary air proving switch to ensure the blower motor is moving sufficient combustion air before the ignition sequence begins. Engineered for compatibility with specific Lochinvar boilers and A. O.