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  1. #1
    Join Date
    Jan 2005
    Posts
    109
    Just went out and bought the set up. B tank,turbo torch. Still haven't found a place that handles nitrogen. I'm installing a 2.5 ton split system,talked with 2 techs. One said go ahead and use Staybrite 8 on anything under 4 tons. The other said he just installed a 2.5 ton unit and brazed. Do you guys also braze at evap.? My other question is what type of tip on torch and also what kind of brazing rod do you suggest? Brazing flux?

  2. #2
    Join Date
    Oct 2004
    Posts
    3,400
    6% to 15% silphos with no flux will work on copper to copper.
    Also on copper to brass, with brazing flux.
    Copper to steel, 45% and brazing flux.
    Heres a link:
    http://www.jwharris.com

    Welding supply houses will most likely have nitrogen.

  3. #3
    Join Date
    Oct 2004
    Location
    PDX
    Posts
    4,917
    You got a B Tank from where? Must have been a welding supply shop, right? They should also sell the nitrogen tank and the regulator as well. At least that is where I got my original set up when I was an apprentice years ago. My shop gets all their gasses from a welding supplier, including nitrogen, oxygen and acetelyne... Try some welding retaillers out there.

    I use silfos 15 for all my joints on residential units, and yes I braze ALL joints, no matter where they are.

    Make sure that when you are cutting the tube with a tubing cutter, that you ream out the burr left inside the tube with a reamer. The ones that come on must tubing cutters are garbage. Get a special reamer designed especially for reaming copper tube and you will be set. Just make sure that the chips and stuff you ream out does not fall into the tube, since this could cause a restriction at a metering device or get jammed in the compressor.

    Tip size depends on what size I am brazing. For my turbo torch, I have an assortment ranging from A3 all tthe way up to A32. I mainy use the A8 or A11 size most. Sometimes when I am afraid that I am gonna burn siding or wood etc. I will use the A5 tip, but it takes alot longer to get the job done with that.

  4. #4
    Join Date
    Jan 2005
    Posts
    109
    I got the B tank at a supply house that deals with mainly plumbing supplies. They didn't carry nitrogen,there is a welding supply house close to my house. I will try there. What is the difference between Air/Acet. and Oxy/Acet.?

  5. #5
    Join Date
    Oct 2004
    Posts
    3,400
    Oxy/Acetelyne has two bottles (oxygen) and can support use of a cutting torch.

    It burns hotter, therefore is easier to overheat your joint.


  6. #6
    Join Date
    Jan 2005
    Posts
    109
    Thanks for the help.

  7. #7
    Join Date
    Oct 2004
    Posts
    3,400
    You're welcome.
    Most of the HVAC contractors around my area use Oxy/Acetylene with an R oxygen and MC acetylene.
    Plumbers use air acetylene and B tank.

    If you had a need to use oxyacetylene, it would require a different torch, with dual hoses & valves.

    (Fill out your profile. More people will respond, and quicker.)

  8. #8
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,642
    every joint we have done for the last 30 yrs has been silver soldered or brazed. we get nitrogen at united refrigeration, don't know if you have them in your area. if not welding supply will have. only problem with welding supplies around here is they make you buy tanks, and every time you turn around they charge you for hydro testing.

  9. #9
    Join Date
    Apr 2004
    Location
    Lubbock, Texas
    Posts
    267

    Thumbs down Quit now!!!!

    First there are supposed to be no DIY questions on this site and when you're done filling your line set with noncondensables call a professional to replace
    Learning never ends and everyone has something to teach. Some people teach me what to be like others teach me what not to be like!

  10. #10
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,509
    with out running nitrogen through system while you braze i would recomand useing staybrite. it will hold up to any size system and with very little flux you will have a better job. brazing with out nito running will oxidize the inside of the pipe and could cause a problem at the orfice screen

  11. #11
    Join Date
    Jan 2005
    Posts
    109
    Not a DIYer Conrad. Went thru a year of school,worked for a company and just started my own business. Busting my tail and barely making it thru my first year. People tell me I'm doing great for a first year because all my bills are paid. EPA Cert. and a Massachusetts Licensed Oil Burner Tech. You never stop learning Conrad and personally I think line sets look like crap!

  12. #12
    Join Date
    Oct 2004
    Posts
    1,722
    I use a B-tank.

    I have used the oxy/ace on a couple occasions. I'm much more accustomed with the B-tank and I've just stuck with it and have no problems using it.

    I use an A-11 tip for the torch. The girl at the welding supply house said that's the biggest tip that is sold for the turbo torch...but I see she is wrong. I'll have to have a talk with her.

    Here are some tips and specs

    http://www.professionalequipment.com...CMP=KNC-Google

    I use silphos 6% or 15%.

    The local hvac supply houses here carry nitrogen. Check with them if it's closer than the welding supply house.

    Get back to work.

  13. #13
    Join Date
    Apr 2004
    Location
    Lubbock, Texas
    Posts
    267

    Wink Sorry for the mistake

    Originally posted by oilman52
    Not a DIYer Conrad. Went thru a year of school,worked for a company and just started my own business. Busting my tail and barely making it thru my first year. People tell me I'm doing great for a first year because all my bills are paid. EPA Cert. and a Massachusetts Licensed Oil Burner Tech. You never stop learning Conrad and personally I think line sets look like crap!
    I am still of the opinion NO FLUX IN ANY REFER SYSTEM!!!!!

    hope that was loud enough!!!
    Learning never ends and everyone has something to teach. Some people teach me what to be like others teach me what not to be like!

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