Lochinvar & A.O. Smith 100288429 Switch Refrigerant while the liquid-filled sensing element

while the liquid-filled sensing element maintains high repeat accuracy regardless of barometric pressure or ambient enclosure temperatures

or system lockouts caused by pressure switches detecting out-of-range parameters

ensuring exact bolt-on compatibility with existing burner assemblies

It is fully compatible with HF9-16 series housings and serves as a direct cross-reference for part numbers HK-E9-16 and HKN-E9-16

and MC-321-103 models

Lochinvar & A.O. Smith 100288429 Switch Refrigerant while the liquid-filled sensing elementThe 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.