• Provides accurate and dependable protection
• External LEDs and simplified wiring for easy installation and testing and patented adjustable probe sensitivity
• Probe-style, microprocessor-based control that detects the fluid level in hot water and steam boilers and reacts when the level falls below the minimum safe operating level
• SPDT switch contact

• Provides accurate and dependable protection
• External LEDs and simplified wiring for easy installation and testing and patented adjustable probe sensitivity
• Probe-style, microprocessor-based control that detects the fluid level in hot water and steam boilers and reacts when the level falls below the minimum safe operating level
• SPDT switch contact

• Continuous maintenance of minimum safe water level, independent of electrical service
• Proportional feed action
• Quick hook-up fittings provided
• Quick change replaceable cartridge valve and strainer
• Model 47 can be field upgraded with a No #2 switch to add low water cut-off function

McDonnell & Miller B120

McDonnell & Miller B122

• Lockout delay
• Power interruption
• Self cleaning probe
• No lock out with loss of power if probe is in water
• Green LED indicates power on
• Red LED indicating low water condition
• 7000 ohm probe sensitivity

• 125 VA pilot duty rating
• Quick change replaceable cartridge valve and strainer
• Proportional feed action
• Includes #2 switch

McDonnell & Miller B111-1

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

McDonnell & Miller B103

• Universal compatibility
• Digital feed counter
• Programmable feed delay settings (30 sec - 10 min)
• Programmable feed amount settings (LWCO and 1-5 Gallon)
• Manual feed button
• Underfeed protection
• Lock-out flood protection

• Field-adjustable dwell-feed cycles
• Multi color LED status indicator
• Manual feed button
• Hard-stop limit to minimize chances of flooding the boiler
• Compatible with all electronic and mechanical low water cut-off
• Includes adapters for connection to 1/2" copper tubing
• Removable strainer

McDonnell & Miller B112-7

• Field-adjustable dwell-feed cycles
• Multi color LED status indicator
• Manual feed button
• Hard-stop limit to minimize chances of flooding the boiler
• Compatible with all electronic and mechanical low water cut-off
• Includes adapters for connection to 1/2" copper tubing
• Removable strainer ,
  
  
  

  McDonnell & Miller B112-6