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| The 150 units, whether snap switch or mercury switch models, provide a
reliable method of controlling a boiler feed pump. Mounted at the boiler water line, it
starts and stops the pump as the boiler water dictates. Consequently, it holds the boiler
water level at the limits recommended by the boiler manufacturer to maintain maximum
steaming efficiency. In addition to the SPST pump switch, it has a SPDT switch which can provide low water burner cut-off. The burner switch interrupts the burner circuit when the water drops below the minimum level and also provides a low water alarm if desired. |