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Loading unit problem mis-diagonosed

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by mmudd, Nov 21, 2012.

  1. mmudd

    mmudd Member

    Joined:
    Jun 7, 2012
    Messages:
    79
    Loc:
    Central MO
    I posted a reply about a problem with my recently installed loading unit in a previous "dump zone design "thread. I thought the thermostatic valve stuck, causing no circulation thru return protection line or supply and return and resulting in an overheat condition. AS USUAL, I should have looked before I typed. Dissassembled the valve last night. No way a stuck valve would have caused lack of circulation. The unit is very well constructed (no sheet metal). Threre is brass ball on a temp sensitive spring. It allows flow either one way or another or both, so no way it could prevent any circulation. The only thing I think it could have been is an air lock at pump or some small piece of stuff in pump rotor. If there was a stuck themostat on this unit, it would allow only return protection circulation, or supply and return circulation. After looking at it, I'm more comfortable with the safety of this thing. This is a very nice piece of equipment, easy to service and well constructed. It's expensive, but is all brass, includes 3 unions, 3 shutoff valves, pump and thermostative valve.

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  2. Floydian

    Floydian Feeling the Heat

    Joined:
    Dec 12, 2008
    Messages:
    444
    Loc:
    Southwestern VA
    Hey mmudd,

    Is yours the LK 810 ? Does yours have the molded insulation and temp gauges as well?This is what I have and I agree, it seems really well made. Hope to see it in action soon!

    I just wish they were available with the 3 speed Alpha like they offer in Europe.

    Noah
  3. maple1

    maple1 Minister of Fire

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    Sep 15, 2011
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    4,525
    Loc:
    Nova Scotia
    Mine is an LK810, but it doesn't have shut off valves. So thinking mmudd has something different? Mine works perfect - although it's only been in operation a couple of months. I use it with the pump set on low speed - very capable of moving the heat to storage.
  4. Floydian

    Floydian Feeling the Heat

    Joined:
    Dec 12, 2008
    Messages:
    444
    Loc:
    Southwestern VA
    termovar_nocover.png
    Mine has the isolation ball valves like in this image. But the body is brass not cast Iron.

    Noah
  5. maple1

    maple1 Minister of Fire

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    That sure looks like my LK 810 but with brass not cast.

    But I don't see valves?
  6. mmudd

    mmudd Member

    Joined:
    Jun 7, 2012
    Messages:
    79
    Loc:
    Central MO
    M unit is also the LK810. The valve handles are the small little two sided nubs on the unions justoutside of guages you turn with a small wrench . Mine is brass also. Apparently, they used to be cast iron. I had a fire last night and no problems. I must say, assuming no more air locks, that the additon of this and some other plumbing changes has made operating the boiler a no-brainer. Don't have to touch any valves, just light a fire.
  7. Floydian

    Floydian Feeling the Heat

    Joined:
    Dec 12, 2008
    Messages:
    444
    Loc:
    Southwestern VA
    LK Acaso bought Termovar and I believe that is when they changed to all brass.

    Mmudd and Maple, glad to hear this is working well for you guys.

    Noah
  8. maple1

    maple1 Minister of Fire

    Joined:
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    Messages:
    4,525
    Loc:
    Nova Scotia
    Man, those are some stealthy valves. I spent quite a bit of time handling mine just looking it over, and during the install - I never noticed valves in those bodies or that those nubs were to turn one. I almost want to un-install mine now just to see for myself. Almost but not quite...

    EDIT: Or maybe I did notice then forgot about them - the mind is the first thing to go?

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