McDonnell & Miller 64 Float Type Low Water Cut-Off 143600 Boiler Control

The McDonnell & Miller 64 (143600) is a float-type low water cut-off for hot water boilers. It is also used on steam boilers. It is a mechanical boiler safety control, also called an LWCO or low water cutoff. Our product data lists it as replacing 64CB and 144000.

Key Features:

• Float-type mechanical design for steam or hot water boiler applications
• Suited to residential, commercial and industrial boilers of any steaming capacity
• Dual precision switches for dependable operation of the low water cut-off and an alarm or electric water feeder
• Packless bellows
• Adjustable BX outlet for easier installation
• 1" NPT equalizing piping required
• Maximum boiler pressure of 50 psi
• Use with the TC-4 on hot water systems

The float-operated control helps protect the boiler by responding when the water level drops too low.