550 Low Water Cutoff for Water Boilers w/ Manual Reset & Test Button/Light - 120V

Hydrolevel low water cut-offs are electrically operated. A probe is installed in the boiler shell or external manifold and is connected to the control unit. Water is used as a conductor to complete the circuit between the probe and the boiler shell. When water is in contact with the probe, the circuit is completed; when the water level drops below the probe, the circuit opens. Hydrolevel controls provide contacts to de-energize the burner circuit in a low water condition

replaces Mcdonnell Miller

PS851-M-120 (153896)

751P-MT-120 (176234)

FPC-1000-P (144705)

• Reliable Electronic Operation
• Low Maintenance
• Easy to Install
• Inexpensive to Own and Operate
• 100% Factory Tested