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  1. #14
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    Quote Originally Posted by acguytx View Post
    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..
    On copper to copper, no flux is needed with 15% silver solder.

    On copper to brass, per manufacturers instructions, 15% silver solder is ok, but flux must be used.
    Remember, Air Conditioning begins with AIR.

  2. #15
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    12,551
    Quote Originally Posted by hvacvegas View Post
    It's not brass.

    but, for the goodman condenser your installing, dynaflow.
    You got that right. Dynaflow works just as well (almost identical temperature range) as 15% silphos and at half the price. Thank you very much
    "I could have ended the war in a month. I could have made North Vietnam look like a mud puddle."
    "I have little interest in streamlining government or in making it more efficient, for I mean to reduce its size. I do not undertake to promote welfare, for I propose to extend freedom. My aim is not to pass laws, but to repeal them. It is not to inaugurate new programs, but to cancel old ones that do violence to the Constitution."
    Barry Goldwater

  3. #16
    Join Date
    Nov 2008
    Location
    DFW,TX
    Posts
    2,169
    Quote Originally Posted by Kevin O'Neill View Post
    On copper to copper, no flux is needed with 15% silver solder.

    On copper to brass, per manufacturers instructions, 15% silver solder is ok, but flux must be used.
    but a service valve on most resi and light comm units arent solid brass and ive never in 15 years used flux on these connections..i assume thats what he meant..I realize that solid brass and SS would require some 45 or higher stick and ive used the ones with flux built into the rod..

  4. #17
    Join Date
    Jul 2013
    Posts
    7
    Quote Originally Posted by acguytx View Post
    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..
    This is “NEW INFO” From the research I’ve done indicated not to use rods with “PHOSPHORUS” when brazing copper to brass ????.

    I’ve already brazed the other sections of copper with Harris stay-silv 15%.

    We are installing a Goodman GSX and the service valve stubs looks like BRASS (was not too certain) glad I asked. And the instructions state a minimum of 2% silver and NOT TO USE FLUX.

    But if The seasoned vets say its oK to use 15% ( I have that rods) then I’m set.

    Thanks again for all the valuable tips

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