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Thread: Cap tube ?

  1. #1
    Join Date
    Apr 2001
    Location
    MINN
    Posts
    938

    Cap tube ?

    I changed a compressor saturday and purged N2 prior ro replacement and cap tube was open. After replacement of compressor and drier and evac. Charge system and start. Low site in vacume and side 80 psi. remove charge and purge with N2. found cap tube resticted. I cutcap tube back several times and this thing was pluged solid. The restricting stuff looked like some kind of lime deposit.
    Did I do something wrong?
    Unit. TRUE Prep table
    R-134
    POE Oil

  2. #2
    Join Date
    Nov 2009
    Location
    Richmond, working under tarps
    Posts
    495
    What took out the first compressor?

    That powder is a result of a reaction in the system (contaminants) and neither a strainer or filter will trap it.

    you most likely will need to replace the entire system with virgin components, or consider a TXV conversion, as its less prone to this type of restriction.

    Or it might be more economic, to replace the case.

    good luck.

    this write-up by supco is pretty good,, http://www.supco.com/images/pdfs/Man...g%20Manual.pdf

  3. #3
    Join Date
    Nov 2010
    Location
    MN
    Posts
    147
    Did you cut or torch old filter. Is that 80 on the high side?

  4. #4
    Join Date
    Apr 2001
    Location
    MINN
    Posts
    938
    80 Psi high side cut out old drier.

  5. #5
    Join Date
    Apr 2001
    Location
    MINN
    Posts
    938
    OK I replaced cap tube and drier and triple evac to 490 microns and all seem ok and i will be stopping by in am to give a quick looksee.
    thank you Guys,.

  6. #6
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    cap tubes are why I figure they invented whiskey.....

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