A trip usually indicates a blocked flue

Its slow-opening characteristic prevents hard ignitions

but the boiler must still be cycled via a primary pressure control or master thermostat to ensure proper condensate return and prevent flooding

Remove the metal guard and turn the adjusting screw

Installing the switch in a horizontal position can shift the setpoint by approximately 0

McDonnell & Miller 345700 Float and Gaskets Freon A trip usually indicates aThe McDonnell & Miller 345700 (Model SA91 60) is a high precision replacement float and gasket kit engineered for heavy duty boiler water level control. As a critical component for Series 93, 193, 94, and 194 combination pump controllers and low water cut offs, this stainless steel float assembly ensures accurate buoyancy and reliable switch activation in high pressure steam environments. The SA91 60 replaces legacy models including the SA92 60 and