maintaining system efficiency and protecting the compressor from liquid slugging during varied load conditions

The manual override switch (ON/AUTO/OFF) allows for immediate circuit testing or bypass without disrupting the captive trippers

or an oversized furnace for the ductwork

the coil is not included with the 3217-00 base part number

McDonnell & Miller 309200 Switch Refrigerant maintaining system efficiency and protectingThe McDonnell & Miller 309200 is an industrial grade 11 MV Millivolt Switch specifically engineered for low water cut off (LWCO) control in steam boiler applications. This millivolt replacement switch is the standard for technicians servicing McDonnell & Miller Series 61, 64, 67, 69, 70, 764, and 767 units. Featuring a Two SPST Auto Reset configuration, the 11 MV provides dual circuit control, allowing contractors to manage both the burner circuit and