Mini split rant!!!
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  1. #1
    Join Date
    Dec 2009
    Location
    Arkansas
    Posts
    76

    Mini split rant!!!

    I have done alot of these and they fill a gap for alot of customers.
    But why in the #### do they put those dang flair fittings on them, is it because no one knows how to sweat lines anymore?? Maybe I need a different flairing tool?? I had to flair one today 3 times to get the proper crush and seal.I hate those things

  2. #2
    Join Date
    Dec 2010
    Location
    Palm Beach,Fl.
    Posts
    947
    I always cut them off at the A/H and sweat them in there. The condensers I don't mind so much, but pulling a wall mount down to fix a flare is retarded. The flare fittings are different though and should be done with an R-410A designed flaring kit.

  3. #3
    Join Date
    Jan 2009
    Location
    Fairfield county Connecticuit
    Posts
    778
    Get the Ridgid 45* flare tool model# 458

  4. #4
    Join Date
    Jan 2009
    Location
    Fairfield county Connecticuit
    Posts
    778
    Never saw a r410a flare kit?

  5. #5
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    4,880
    or just use the flares that come with the lineset. Fujitsu/mitubishi linesets come with them, and your not supposed to use any flare other than factory flare.
    "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

  6. #6
    Join Date
    Dec 2009
    Location
    maroon lazyboy
    Posts
    1,044
    Quote Originally Posted by hvacvegas View Post
    or just use the flares that come with the lineset. Fujitsu/mitubishi linesets come with them, and your not supposed to use any flare other than factory flare.
    What do you do with the xtra lineset???

  7. #7
    Join Date
    Jan 2010
    Location
    Nebraska
    Posts
    107
    I was told at a Mitsubishi school that they use flares because there is no filter dryer (no room due to how it's piped inside the unit) and by not cutting and brazing you eliminate possible chips and burs and there will be no copper oxides from brazing without nitrogen.

  8. #8
    Join Date
    Jan 2009
    Location
    Indiana
    Posts
    3,228
    Quote Originally Posted by hvacvegas View Post
    or just use the flares that come with the lineset. Fujitsu/mitubishi linesets come with them, and your not supposed to use any flare other than factory flare.
    X2
    also both lines come pre insulated

  9. #9
    Join Date
    Dec 2009
    Location
    Arkansas
    Posts
    76
    Quote Originally Posted by SoFlaDave View Post
    I always cut them off at the A/H and sweat them in there. The condensers I don't mind so much, but pulling a wall mount down to fix a flare is retarded. The flare fittings are different though and should be done with an R-410A designed flaring kit.
    This is the way I do it also.Yes I have a 410a flairing tool it is just a pain in the butt!! I put in mostly LG units and wish they would include factory flairs.

  10. #10
    Join Date
    Dec 2010
    Location
    Palm Beach,Fl.
    Posts
    947
    We used Samsung and Sanyo at first but have since switched to Comfort
    Star which I actually prefer. Never used a factory line set from anyone. Most of our installs aren't as simple as "going through the wall" so they aren't very practical for us. I saw some neoprene flare gaskets the other day at Johnstone which may reduce your nuisance leaks but I haven't used them yet.

  11. #11
    Join Date
    Jan 2011
    Posts
    92
    i'm sure you are cutting your pipe squarely and cleanly like your suppose to.

    Trade secret: Put a little oil on the flare contacts before joining together. dont go crazy with it, just a little vac oil on the brass fitting. I do this with all my mini-splits and gas lines and i have never ever had a flare leak.

    of course it doesnt work with dirty burred flares.

  12. #12
    Join Date
    Feb 2010
    Location
    butler pa
    Posts
    1,073
    or...WHY CANT THEY MAKE THE LOWER FRONT COVER removable to acess
    drain line...ya gotta pull the freaking thing off the wall to do it..
    a freaking design issue...

  13. #13
    Join Date
    Nov 2001
    Location
    Seattle, WA
    Posts
    7,744
    Japan has been building these things for years before they were known in the US. Since most everything in Japan is flamable the Japanese try not to use fire in any method outside of cooking or heating where the flame can be controlled.

    So on mechanical things they use flare nuts in place of brazing to eliminate the torch flame.

    The new R410a flare nuts used on these things typically will only work with the new R410a flare nut kit. And you have to use the flare nuts on the mini split and not on the line sets.

    I tried to not buy one of those R410a flare nut kits to save money on my last 3 mini-split installs. I already have two or three flare kits and who needs another tool. I've installed systems before with my old flare kit and never had a problem.

    The counter guy put one on the and said I'd better buy it and use it. No way. A few days later I found that over half of my flares leaked under the pressure test. So I had to return to get the kid and undo a lot of my work to reflare every flair nut. No leaks from that point on. And the drop of vauccum pump oil is wise advice.
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

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