Using a switch with a different setpoint can lead to unsafe operation or frequent "pressure switch stuck open" errors

Direct 621773R Swap: Seamlessly replaces legacy part numbers

providing the necessary strain relief and environmental protection required for continuous duty applications

ensuring a seamless fit during maintenance or system overhauls

this specific model is engineered for 480V 60Hz AC operation

Lochinvar & A.O. Smith 100110589 Pressure Switch 320720-756 Using a switch with aThe Lochinvar & A. O. Smith 100110589 Pressure Switch is a critical safety component designed for high efficiency boilers and water heaters. As a genuine OEM replacement part, this switch ensures the combustion air pressure and venting conditions meet precise operational parameters before allowing the ignition sequence to proceed. It effectively monitors the inducer draft, preventing the system from firing under hazardous conditions such as blocked