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Guard dog LWCO

eric416
eric416 Member Posts: 2
in Gas Heating

Looking for help wiring guard dog low water cut off model RB24E into Burnham ES2 gas boiler. The lwco has a grey wire harness with 4 wires. Much appreciated.

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 25,365

    What happened to the manual that was in the box?

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • guzzinerd
    guzzinerd Member Posts: 317

    https://www.manualslib.com/manual/23092/Burnham-Es2-Es2.html

    Bryant 245-8, 430k btu, 2-pipe steam in a 1930s 6-unit 1-story apt building in the NM mountains. 26 radiators 3800sqf

    eric416
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,777
    edited January 21

    do you have the wiring harness Y that will be connected to the vent damper? That will give you a place to connect the LWCO

    McDonnell Miller Y connector

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • ethicalpaul
    ethicalpaul Member Posts: 7,064
    https://forum.heatinghelp.com/discussion/comment/1836851#Comment_1836851

    If he knew that, he wouldn't be here probably!

    NJ Steam Homeowner.
    Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
    See my sight glass boiler videos: https://bit.ly/3sZW1el

    EdTheHeaterMan
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,777
    edited January 21

    If you don't have the Y connector then you can connect the pig tail connector this way.

    Screenshot 2025-01-21 at 6.20.54 PM.png

    In the wiring diagram there is a shaded area that represents the RB-24E with bare end wires on one end and the 4 pin connector on the other end. You need to connect 24 VAC to the red and the white on the RB-24E pig tail so the RB-24E has power (as shown on the diagram in Br and Pi). then connect one of the yellow wires to the MV terminal on the gas valve by removing the orange wire from the gas valve. Then connect the other yellow wire to the orange wire you removed from the gas valve MV terminal.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    eric416
  • eric416
    eric416 Member Posts: 2

    Thank you for the replies. It is the harness with the bare wires on one end. I located the orange wire for the gas valve. Could I take 24v from the control board where it says d.h.w. or do i have to extend the red & white directly to the 24v transformer?

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