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Old Richmond Furnace looking to replace Fan limit switch.

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MrMagic
MrMagic Member Posts: 20
edited October 30 in Gas Heating

I have a old Richmon Furnace looking to replace combo limit Fan limit switch. Blower Fan comes with call for heat but will not shut off.

14029c 1115 1 G14

14028F 1002 1 G14

16128.jpg 16114.jpg 16201.jpg

Comments

  • mattmia2
    mattmia2 Member Posts: 15,067

    Just need a residio or white rodgers combo fan/limit control with the appropriate probe length.

    HVACNUT
  • HVACNUT
    HVACNUT Member Posts: 7,157

    Measure the insertion piece. Resideo Fan/Limit. It comes with instructions when there's two different voltages, which you have. You'll have to cut a jumper.

  • MrMagic
    MrMagic Member Posts: 20

    Thanks. Ok I'll measure the prob length this weekend.

  • mattmia2
    mattmia2 Member Posts: 15,067

    Probably will have to drill some new holes to mount it, don't go too deep and use short screws, you just want to drill through the cabinet, not in to the heat exchanger.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,172

    Honeywell L4064B. They make several models. Insertion can be 5 1/2", 8" or 11" Fan/limit control

  • MrMagic
    MrMagic Member Posts: 20
    16282.jpg 16281.jpg
  • MrMagic
    MrMagic Member Posts: 20

    Insertion piece is 3.5 inches. There is only 4 inches of space in compartment.

  • HVACNUT
    HVACNUT Member Posts: 7,157

    The existing is two separate controls, where the new one will be a combination fan/limit. Some metal fabrication will need to be done so everything is properly sealed.

    mattmia2
  • mattmia2
    mattmia2 Member Posts: 15,067

    that corrugated stuff inside the cabinet is very likely asbestos millboard.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,172

    I don't know if you can get one that short.

    You could buy one with the 5 1/2 " insertion and put a spacer behind it.

    Or (although not the best fix) put the new one in the plenum up above and put the old one back in just to close the hole.

    Grallert
  • MrMagic
    MrMagic Member Posts: 20

    What if I just mount an 2 metal conduit boxes and offset insertion differnce? or use and extention box pieace?

    ex.jpg
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,172

    You can do that. I would make it as air tight as possible with HT silicone

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