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  1. #1
    Join Date
    Jun 2007
    Location
    Rochester, NY
    Posts
    29

    proper way to connect copper tubing to aluminum?

    working on an old GE RTU that I did a compressor replacement on and the line going from the roto lock fitting into the evaporator coil broke loose. Was wondering if any one had any insite on repairing the copper line going to the aluminum coil. If it was just copper I could braze it but being copper to aluminum poses a tricky situation. Any help would be greatly appreciated. thanks in advance!!

  2. #2
    Join Date
    Nov 2002
    Location
    NJ - WORK IN NYC AREA
    Posts
    1,416

    Smile

    Your supply house should have some type of solder to do the job. It's been a while since I have done a repair like that. I think HARRIS the manufacturer of various solders makes a kit for it.

    The only suggestion I have is not to over heat when doing the procedure. You may know the Aluminum will melt if you heat it too much. Keep ypur distance with your tourch flame to control you temprature.
    "My hands are for sale"

  3. #3
    Join Date
    Apr 2008
    Posts
    18
    If the copper and aluminum are both 3/8", Trane makes a coupling designed for just this repair. It crimps the aluminum on one side and the copper on the other. You can get it at a Trane parts store for sure, though others may sell it as well.

  4. #4
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,641
    flare fitting......

  5. #5
    Join Date
    Dec 2004
    Posts
    239
    Harris stay bright 8 and the black flux for aluminum, or an uniweld aluminum solder kit ( the one with the little bottle of honey colored flux ). both work great just be careful of the heat.

  6. #6
    Join Date
    Jun 2007
    Location
    Rochester, NY
    Posts
    29
    Thank you all for the info. I really appreciate it going to try and solder it first if that don't work maybe then try a flare.

  7. #7
    Join Date
    Oct 2003
    Location
    las vegas
    Posts
    1,505
    have done many of these repairs & the flare is the only one that has held
    up over the long run for me. carrier used to have a coupling that you had to
    heat & when the end started to change color you pulled the heat back &
    let it cool & procede with repair. some where i still have some of those laying around but i think carrier discontinued those.

  8. #8
    Join Date
    Dec 2007
    Location
    Southern, CA
    Posts
    520
    Didn't those things have epoxy inside? Years back, had a guy from an independent metal lab come to the company to demonstrate their new solder that did copper to aluminum. He brazed some and brought a pepsi can with a piece of copper sweated on the bottom, it was beautiful. The senior tech argued that if it had oil passed through it, it wouldn't work, and challenged the guy to fix one he knew of. They agreed if they couldn't fix it, they'd buy the new coil for the customer. End result, customer got a free coil.

  9. #9
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    use the flare fitting!



    .

  10. #10
    Join Date
    Jun 2004
    Location
    St Paul, minnesota
    Posts
    1,015
    Quote Originally Posted by Airmechanical View Post
    use the flare fitting!



    .
    like he said.
    if the aluminum coil has oil in it and it most likely does, then the solder won't hold for long.

  11. #11
    Join Date
    Nov 2005
    Location
    Shreveport, Louisiana
    Posts
    2,324
    Quote Originally Posted by t527ed View Post
    flare fitting......
    DITTO
    UA Local 141

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