RB-122E, Electronic, 120V Low Water Cut-Off - (Water) Zoom

RB-122E, Electronic, 120V Low Water Cut-Off - (Water)


Brand: Mcdonnell & Miller

Mcdonnell & Miller
Qty Price
/ each
$218.85 / box (3 units x $72.95)
In Stock! Ships in 24-48 Hours
(102 Available)



Application: Hot Water Boilers
Type: Electronic
Reset Type: Automatic
Max Pressure (PSI): 160 psi
Max Temp (F): 250°F
Sensitivity: 15000 ohms
Max Ambient Temp (°F): 120°F
Power Consumption: 3.1 VA
Width: 3-3/16"
Depth (Inches): 2-3/4"
Length: 3-13/16"

Description for Mcdonnell & Miller 144676

  • For residential and (where codes allow) commercial applications
  • Electronic operation
  • Easy to install and wire
  • Red low water indicating LED
  • Green power indicating LED
  • Automatic reset
  • No blow down required

  • RB-122E, Electronic, 120V Low Water Cut-Off - (Water)


    by PowerReviews
    Mcdonnell & MillerRB-122E, Electronic, 120V Low Water Cut-Off - (Water)

    (based on 1 review)

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    Reviewed by 1 customer

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    Great product

    By Handyman

    from Elizabethtown, Pa

    Verified Buyer

    Comments about RB-122E, Electronic, 120V Low Water Cut-Off - (Water):

    Guard dog is very simple to install in the solution boiler.Wiring is easy but wiring scimatic was a little confusing with my boiler.
    I would reccomend this product.

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    1 Question | 2 Answers
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    • RB-122E, Electronic, 120V Low Water Cut-Off - (Water)


      Looking at this to pair with a Peerless PF-110. The PF-110 has a built in service switch, so it seems that a separate shutoff switch is not needed. But the RB-122E schematic calls for it to be wired into an external switch. Is there a way to wire it on the PF-110, or does a separate power switch need to be added?
      Asked on 3/25/2013 by ringgoldst from Peekskill, NY

      2 answers



        Doesn't the PF-110 have it's own sensor to detect a lack of supply water?
        The RB-122E is intended to be tied into the "Burner Shutoff switch" which
        is usually located outside the boiler room or at the top of the basement
        stairs when the oiler is in the basement. I might guess your PF-110 would
        still require a Burner Shutoff Switch beyond the unit's internal power
        Good luck.

        Answered on 3/26/2013 by Anonymous


        The RB-122 is power by 120vac and the dry contacts get connected to the terminal board labeled for LWCO so if you take the source from the TB you have a switch controlling it from the equipment
        Sent from my iPhone

        Answered on 3/27/2013 by Anonymous
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