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Professionals trust this Lennox furnace part for its exact fit and consistent resistance values across extreme thermal cycles
or unexpected boiler modulation issues
System Longevity: Helps prevent compressor failure by ensuring only vaporized refrigerant returns through the suction line
System Stability: Engineered to reduce hammering effects with flash steam through precise pressure differential management
McDonnell & Miller 310488 Switch Assembly Els PW 29614 Professionals trust this Lennox furnaceThe McDonnell & Miller 310488 is a field replaceable SWA 42S Snap Switch Assembly engineered specifically for Series 42S low water cut off and pump controllers. This single pole, single throw (SPST) mechanism provides precise automatic reset functionality, ensuring consistent boiler feed pump control and high limit safety across residential, commercial, and industrial steam applications. Built with a robust housing and high quality internal contacts,
