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  1. #1
    Join Date
    Jul 2013
    Posts
    7

    Brazing copper tube to Brass fitting

    Good evening HVAC Guru's,

    What is the best method to braze 7/8 and 3/8 HVAC copper line set to brass service valve. Any help will be welcome.

    Thanks in advance

  2. #2
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,158
    White paste flux, and 45% silver.

  3. #3
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,158
    Welcome here by the way, you will get more answers if you post in the tech to tech chat section.

  4. #4
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,777
    Quote Originally Posted by Chuck View Post
    Welcome here by the way, you will get more answers if you post in the tech to tech chat section.
    Better yet, I can just move it there...

    Moved this to tech to tech chat

  5. #5
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Quote Originally Posted by Chuck View Post
    White paste flux, and 45% silver.

  6. #6
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,060
    Flux coated 45% silver rods work well.

  7. #7
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    2,032
    What everyone said above +

    The best method is the one that when done not only meets the manufacturer's specifications, it also doesn't damage the service valves.

    Don't forget the nitrogen.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  8. #8
    Join Date
    Jul 2002
    Location
    SE Texas
    Posts
    450
    Stay-Silv 15 and white flux.
    With your chrome heart shining in the sun, long may you run.

  9. #9
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,094
    It's not brass.

    but, for the goodman condenser your installing, dynaflow.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  10. #10
    Join Date
    Jul 2013
    Posts
    7
    Thanks for the tips. Seems like White paste flux, and 45% silver is the "method of choice"

    Yes I'll be using nitrogen.

  11. #11
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,480
    5-15% silphos is all you need for connecting the copper line set to the service valve stubs on a condenser if that's what you're doing.

  12. #12
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,158
    Quote Originally Posted by jtrammel View Post
    5-15% silphos is all you need for connecting the copper line set to the service valve stubs on a condenser if that's what you're doing.
    True

  13. #13
    Join Date
    Nov 2008
    Location
    DFW,TX
    Posts
    2,170
    Quote Originally Posted by Chuck View Post
    True
    x3

    45% and flux is over kill( that is used for true solid brass/stainless) and 15 stay-silv/silfoss etc etc is all you need NO FLUX but pull valve caps, shroeder cores, a good wet rag over valves plus a good oxy/acet rig with good hot heat go fast and true then pour water over repair area immediately after your done.. check for leaks with Nitro, 250 for 22 and 400 plus for 410, and your golden..

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