Automatically shuts off burner in a low water condition to prevent boiler damage Heavy-duty electro-mechanical design for long life Low maintenance, no moving parts to wear or stick Auto reset feature automatically re-energizes circuit upon return to safe water level Manual reset feature requires manual reset if low water condition exists for 30 seconds or longer Test button allows operator to test control operation without lowering water level L42-929 and L42-932 are equipped with shorter probe for mounting in standard reducing tees L42-931 and L42-935 are compact models for applications with space limitations
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