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Buderus Threaded Connection Question

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FB
FB Member Posts: 45
In a Buderus GB142, one of the steps in removing the heat exchanger requires unscrewing the large upper nut in the picture to disconnect the return water supply. Looking down at that upper nut, does it unscrew in a clockwise or a counter clockwise direction? Any advice you can share about breaking this connection (without damaging anything else) is much appreciated.

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  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,095
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    That should back off in a counterclockwise direction.  ALWAYS hold back with another pipe wrench or good channels KS. Its stronger than it looks  go for it    Mad Dog 🐕 
  • hot_rod
    hot_rod Member Posts: 22,245
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    the upper nut turns counter clockwise to loosen
    the lower nut would turn clockwise 

    Those are probably unions with fiber washers. The washer should be replaced when you put it back together.


    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Big Ed_4
    Big Ed_4 Member Posts: 2,805
    edited July 2023
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    Good luck getting them off , yes try , wish I had the right size wrench for the unions . A Stilson can lock the union nut up ,Try reversing the pipe wrench . if any problem cut an open slot in the union nut. The union not can be replaced It is held in with a brass clip. Apply soft set pipe dope to the treads when reinstalling . I order new supply pipes and compressions just to be safe ...

    There was an error rendering this rich post.

    Mad Dog_2FB
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,095
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    I'm a pipe dope fanatic...I dope both sides of flange gaskets, Union threads, Union faces, nuts ferrules...You keep it out of the pipe, and it all wipes off..15 Years later when u havta take it apart, its a pleasure..gaskets come off too. Mad Dog 🐕 
    FBMikeAmannrick in Alaska
  • Big Ed_4
    Big Ed_4 Member Posts: 2,805
    edited July 2023
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    Need to think as pipe dope as a lubricant . Which is the purpose for it. Just to get a extra turn...The GB uses washers to seal connections . The NPT tapered thread needs the lubricant as to not gull the threads... The taped threads seal the pipe...

    There was an error rendering this rich post.

    FBMad Dog_2
  • hot_rod
    hot_rod Member Posts: 22,245
    edited July 2023
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    A trick that my dad, maybe grandfather taught me. It works on nuts, pipe fittings, most  any stubborn connection

    A large and smaller hammer across  from one another. Gently tapping with the smaller hammer with the larger held directly across. Keep the larger hammer pressed tightly against the fitting. You should feel the strike from the small hammer in the larger one

    go all the way around, this expands the nut slightly to free it up. It rarely fails.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    FBMad Dog_2
  • Big Ed_4
    Big Ed_4 Member Posts: 2,805
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    I would remember this tip , thanks

    There was an error rendering this rich post.

    Mad Dog_2
  • FB
    FB Member Posts: 45
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    Thanks for all your helpful answers. The wisdom here runs deep and wide.
    MikeAmann
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,095
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    New word.."Gulled" the thread. What State you from?  Never heard that?  Cool  Mad 🐕 
    mattmia2
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 8,025
    edited July 2023
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    Mad Dog_2 said:

    New word.."Gulled" the thread. What State you from?  Never heard that?  Cool  Mad 🐕 

    Depends on what Gull you are speaking of .... Is it a Sea Gull ? Any coastal state will know about them. If it is a Bay Gull then I might think Brooklyn?


    My 4 YO grandson loves to tell me that BayGull joke!

    Edward Young Retired

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

  • psb75
    psb75 Member Posts: 843
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    "Gulled" ? That takes some gall....to ask that question MD.