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Weil-McLain CGa series 2 LWCO Electrical connection

HandyHenry Member Posts: 1
Hey everyone,

Happy holidays. I have just gotten a new Weil-McLain CGa series2 gas heater and because it's new and the Electrical board has been prefixed, I dont know where to connect the wires for the McDonnell & Miller 24V LWCO and the emergency stop device with temperature control.

I have called their tech and he told me the incoming (which is 120V) so I said thanks but no thanks.

this is a 24v lwco and because I have previous experience (10+ years with CGa 3) I am lost with this new device.

I have the original manual and it has nothing on lwco and emergency switch off device.

this is for NYC plumbing regulations


  • Tim McElwain
    Tim McElwain Member Posts: 4,624
    What is the number

    on the board is it 1107-2?
  • Tim McElwain
    Tim McElwain Member Posts: 4,624
    I have a manual

    for an older version of the CGA and it requires LWCO to be wired in series with the Water Temperature Limit Switch, look for yellow wire going from limit to the roll-out switch and wire it in between those two controls.
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