Continue with verification procedure to determine operation. 1 single pole, double break switch. This switch features a single pole.
McDonnell & Miller 1937B Pump Controller w/ Water Column Products BoilerWAREhouse
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7B Switch (135Ohm Proportional Control Signal) To Maintain Constant Boiler Water Level;
Web mcdonnell & miller model number 7b is an automatic reset proportioning switch assembly for model number 93, 193, 94, and 194 controls. Combination low water cut off and pump controller with potentiometer switch for steam boilers with 250 psi max pressure (part number. Web if pointer is on white insulator, the 7b switch may have been adjusted in the field.
Web Replacement Head Mechanism With Switch Assembly:
