McDonnell & Miller Mechanical LWCOs

McDonnell & Miller Series 61 Low Water Cut-Offs

Series 61 LWCOs are ideal for residential and commercial low-pressure steam boiler applications and boilers of any steaming capacity.

Features:

• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder
• Packless bellows
• 1" NPT equalizing pipes and blow-down valve required
• Maximum steam pressure: 20 psi (1.4 kg/cm²)

McDonnell & Miller Series 63 Low Water Cut-Offs

Series 63 LWCOs are for residential, commercial, and industrial applications.

• Heavy duty
• Includes No. 2 switch
• Optional manual reset available
• Maximum boiler pressure: 50 psi (3.5 kg/cm²)
• Use with TC-4 valves on hot water systems

McDonnell & Miller Series 64 Low Water Cut-Offs

Series 64 LWCOs are ideal for residential, commercial, and industrial boiler applications of any steaming capacity.

Features:

• Heavy duty
• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder
• Packless bellows
• Optional manual reset available
• 1" (25mm) NPT equalizing pipes required
• Maximum boiler pressure: 50 psi (3.5 kg/cm²)
• Use with TC-4 valves on hot water systems

McDonnell & Miller Series 67 Low Water Cut-Offs

Series 67 LWCOs are for residential and commercial applications and boilers of any steaming capacity.

• Quick hook-up fittings provided
• Lever-operated, full port ball valve for easy blowdown
• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder

Optional features:

• Low voltage switches for self-generating millivolt circuits
• Manual reset switch
• Large float chamber
• Maximum steam pressure: 20 psi (1.4 kg/cm²)

McDonnell & Miller Series 69 Built-In Low Water Cut-Offs

Series 69 built-in LWCOs are for residential and commercial low-pressure steam boiler applications and boilers of any steaming capacity.

Features:

• For mounting in 2-1/2" NPT boiler side tappings
• Insertion lengths available in 13/16" to 4-1/8" (30-105mm)
• Packless bellows
• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the low water cut-off and an alarm or electric water feeder
• Millivolt circuits
• Maximum steam pressure: 20 psi (1.4 kg/cm²)

McDonnell & Miller Series 764 Low Water Cut-Offs

Series 764 LWCOs are ideal for residential, commercial, and industrial boiler applications of any steaming capacity.

Features:

• Heavy duty
• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder
• Packless bellows
• 21⁄2″ NPT side tapping provided for installation with close nipple
• Maximum boiler pressure: 50 psi (3.5 kg/cm²)

McDonnell & Miller Series 767 Low Water Cut-Offs

Series 767 LWCOs are ideal for residential and commercial low-pressure boiler applications and boilers of any steaming capacity.

Features:

• 2-1/2" NPT body tapping for side mounting on boilers
• Lever-operated, full port ball valve for easy blowdown
• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder
• Large float chamber
• Maximum steam pressure: 20 psi (1.4 kg/cm²)

McDonnell & Miller Series 1575 Low Water Cut-Offs

The Series 1575 provides continuous protection against a low water condition and satisfies pump control needs for commercial and industrial steam boilers. In addition, Series 1575 LWCOs compensate for rapidly changing water levels. They offer adjustable burner and pump settings, as well as powerful 1 HP relays.

Features:

• Primary low-water fuel cut-off protection and pump control for commercial and industrial steam boilers
• Motorized valve controller, low water cut-off, high water cut-off, and alarm actuator for boilers, vessels, and tanks