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

allowing for high-density relay packing in custom control enclosures

This compact component is a standard for contractors looking to improve system reliability and ensure backup pump availability during peak loads

What is the maximum close-off pressure

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.