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  1. #1

    Refrigerant Stop Leak

    I replaced a compressor in a 7.5 ton Carrier roof top unit on a restaurant recently. It went well and the unit runs fine. I went back a few days later to check things out and found a big oil spot on the condensing coil. It looks like a pretty good leak. This unit is 10 years old and in hind sight I shoud have probably just replaced the unit. But it seemed pretty sound.
    I feel bad for the owner since he spent his good money after bad equipment.
    My question is, this refrigerant stop leak. Does it work ?
    I think if I could get him through this summer, he'd replace the unit next year. The coil is leaking around the galvanized end plates. So it can't be fixed.
    Thanks.

  2. #2
    Join Date
    Dec 2010
    Location
    New Orleans
    Posts
    1,012
    Do not use stop leak, it ought to be called stop compressor. You can fix a leak around the galvanized just cut it out very carefully and use low heat, but make sure you know exactly where the leak is.

  3. #3
    Join Date
    Feb 2012
    Location
    EVERYWHERE
    Posts
    228
    Quote Originally Posted by gmac100 View Post
    I replaced a compressor in a 7.5 ton Carrier roof top unit on a restaurant recently. It went well and the unit runs fine. I went back a few days later to check things out and found a big oil spot on the condensing coil. It looks like a pretty good leak. This unit is 10 years old and in hind sight I shoud have probably just replaced the unit. But it seemed pretty sound.
    I feel bad for the owner since he spent his good money after bad equipment.
    My question is, this refrigerant stop leak. Does it work ?
    I think if I could get him through this summer, he'd replace the unit next year. The coil is leaking around the galvanized end plates. So it can't be fixed.
    Thanks.
    I never used it but hear bad things about it.Also I seen on it that in order for it to work youhave to pull a vacuum down to 400 Micron which is hard with a leak.

  4. #4
    Join Date
    Dec 2010
    Location
    New Orleans
    Posts
    1,012
    Quote Originally Posted by FixItRight View Post
    I never used it but hear bad things about it.Also I seen on it that in order for it to work youhave to pull a vacuum down to 400 Micron which is hard with a leak.
    Yes that is pretty funny. They CYAed on that one.

  5. #5
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    888
    Dont do it or youll be changing that compressor again

  6. #6
    Join Date
    Jul 2011
    Location
    East coast USA
    Posts
    979
    Quote Originally Posted by coolerik View Post
    Dont do it or youll be changing that compressor again

    Just pump cement in there and get it over with

  7. #7
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    888
    Quote Originally Posted by dlove View Post

    Just pump cement in there and get it over with

  8. #8
    Quote Originally Posted by keeplearnin View Post
    Do not use stop leak, it ought to be called stop compressor. You can fix a leak around the galvanized just cut it out very carefully and use low heat, but make sure you know exactly where the leak is.
    ^THIS!^

    It's really not a difficult repair to make, it just takes time. I've done this several times (mostly on RHEEM units), and haven't had any call backs. Just be very careful with your heat and you'll be fine.

  9. #9
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,390
    I have used it twice on older McQuay heat pumps and haven't had any problems, it seals the leaks for good. I get it from united.



    http://www.nucalgon.com/assets/prodlit/3-52.pdf

  10. #10
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    141
    how would you braze galvanized? would you use silver solder or soft solder?i have never done it before thanks

  11. #11
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    888
    U dont braze the galvanized, you carefully cut it out and silfos the leak... time comsuming but better than putting glue in the system and distroying the whole unit

  12. #12
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    888
    Quote Originally Posted by valdelocc View Post
    I have used it twice on older McQuay heat pumps and haven't had any problems, it seals the leaks for good. I get it from united.



    http://www.nucalgon.com/assets/prodlit/3-52.pdf
    U got lucky or somthing, cause i used once when i was an apprentice, and the compressor packed it in a week later...never even concidered using it again.. fix it right and dont be lazy

  13. #13
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    Don't use stop leak. It's only approved if you are a 'home warranty servicer'.

    I have great results with this stuff concerning your situation. I use needle nose pliers to remove the aluminum fin material (3" x 3" square or larger) around the area of the leak, then braze the copper tube and galvanized together, encapsulating the leak. Watch your heat - the copper tubing is thin, and the galvanized will not accept the brazing if it is 'cherried' (overheated) for too long.

    I have done this many many times with great results. Do not breathe the fumes from the galvanized or it will make you sick - very sick.

    This beats trying to cut the galv away from the tubing, as it always gets damaged, then you have to cut it and 'sleeve' it with 1/2". Unless you prefer to spend a long time cussing on a 'temporary' repair.

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