Universal Mounting: Compact frame design and 72-inch capillary length simplify installation in various walk-in and cooler configurations

Replacing a failing switch with this genuine 100111120 pressure switch ensures seamless compatibility with Lochinvar boilers and A

for predictable system response

Time-Delay Functionality: Engineered as a slow-blow fuse to handle the initial inrush current from circulator pumps and combustion blowers

Common causes include low suction pressure (below 55 PSI)

Williams P168400 Burner L99H008 Universal Mounting: Compact frame designThe Williams P168400 Burner is a precision engineered OEM replacement part specifically designed for Williams Direct Vent Wall Heaters, primarily supporting the 1403 series such as models 1403821 and 1403822. As a veteran grade burner assembly, it is constructed from high grade stainless steel to provide superior thermal resistance and maintain consistent flame stability in gravity direct vent furnaces. Experienced technicians recognize the P168400