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1992 Weil McLain CGM-4 Series 9 (Spark Ignition)

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tonynap
tonynap Member Posts: 9
in THE MAIN WALL

Hello

I'm looking for any information available for replacing the High Limit Temperature Control part number 510-312-250 on this boiler.

TIA

Comments

  • mattmia2
    mattmia2 Member Posts: 15,647

    pictures of what you're trying to replace. is it just an aquastat?

  • HVACNUT
    HVACNUT Member Posts: 7,241

    This is from the WM discontinued parts section.

    Screenshot_20251228_200152_Drive.jpg

    WM does have a habit of changing part numbers with revisions.

    Neither the 24 volt or millivolt part numbers match what you have. Almost any high limit will work, though.

  • tonynap
    tonynap Member Posts: 9
    https://forum.heatinghelp.com/discussion/comment/1879614#Comment_1879614

    Probably, but I'm using the part number and description from the discontinued parts catalogue and they do not call it an aquastat like they do elsewhere

    image.png

    Here's the part installed. It's really hard to get a good picture.

    image.png

    The left side terminal is wired to the two fan relays

    The right side terminal to the gas valve

    Thank you

  • tonynap
    tonynap Member Posts: 9

    Thank you for the quick replies everyone.

    I'm only able to find 510-312-250.

    Any help on how to replace it would be great.

  • neilc
    neilc Member Posts: 3,129

    I see it listed on supply house dot com

    known to beat dead horses
  • neilc
    neilc Member Posts: 3,129

    https://www.supplyhouse.com/Weil-Mclain-510-312-250-Operating-Temperature-Control-All-Sizes

    known to beat dead horses
  • tonynap
    tonynap Member Posts: 9

    I'm sorry I'm not being more clear.

    I'm looking for installation instructions for this part.

  • mattmia2
    mattmia2 Member Posts: 15,647

    that is just an aquastat that is open on rise with a 30 degree differential. why are you looking for one? they can go bad but that really isn't doing much work so it isn't super likely to go bad

  • tonynap
    tonynap Member Posts: 9

    Thanks

  • tonynap
    tonynap Member Posts: 9

    does it just unscrew?

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,621

    @tonynap There is a screw that holds the control into the aquastat well. It is a slotted screw on the top of the control. I think it is only slightly visible in the picture.

    Losen the screw and you may have to pull up on the clamp retainer and pull the control out of the sensing well.

    Don't unscrew the well with water in the boiler.

    Go to the link that @neilc posted above to see the control.

    tonynap
  • tonynap
    tonynap Member Posts: 9 

    Thank you very much Ed.

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