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  1. #1

    Confused

    ok, i am getting conflicting reports from three different contractors.

    i am having a ductless mini-split type air conditioner installed upstairs in my daughters room.

    one guy told me they hook it up and thats it, turn it on, good to go.

    another guy tells me they pressureize the system, and then its good,

    the third guy tells me THEY put a vaccum on it and then it is good.

    i dont really care what is the right way, but somebody or two somebodies are lying to me.

    help me sniff this out

  2. #2
    Join Date
    Jun 2003
    Location
    Texas
    Posts
    1,159

    Sounds good to me...........

    hook it up, pressurize it, pull a vacuum and yer good to go.

  3. #3
    well, they are all right. the indoor unit and outdoor unit and lineset are installed, a vaccum is hooked up to remove contaminents from the lines, then the lineset becomes pressurized once the ports are opened.


  4. #4
    Join Date
    Jul 2002
    Location
    Slacking off right now
    Posts
    7,546
    the third guy is really correct. to do a correct installation of a mini split the indoor section and the piping need to be pressurised for a leak check then evacuated to remove the gasses and any moisture present once this is completed then the valves on the out door unit are opened and the unit commissioned. depending upon the manufacture and the length of the pipe run refrigerant may need to be added or removed to ensure peak performance.

    it is possible that some people may been skipping some steps this reduces the units life expectancy, and capacity of the unit. it is also possible that the contractors you talked to did not explain the procedure completly even though they will do a pressure test and vac before opening the valves.
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  5. #5
    Pressurize and leak check, pull vacuum for short time, open valves and turn it on.
    Hey cockroach, don't bug me! ©

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  6. #6
    Join Date
    May 2000
    Location
    Colorado flatland native
    Posts
    15,067
    Originally posted by Diceman
    Pressurize and leak check, pull vacuum for short time, open valves and turn it on.
    Dice is the "Resident Expert" at these. We all still cant get over his amazing skills of running linesets!
    My doctor gave me six months to live, but when I couldn't pay the bill he gave me six months more.
    Walter Matthau

  7. #7
    Join Date
    Mar 2004
    Location
    NJ
    Posts
    1,214
    They are probably all gonna do the same thing, just some have better communication skills than others... It would take a real lack of talent to screw up a mini-split.

    And Diceman is the expert on these? I thought it was that toothless first time poster english bloke in the Wall of Pride....but your probably right.
    thehumid1-------I live in NJ, a state where it's free to come in but you have to pay to leave!

  8. #8
    Join Date
    Feb 2004
    Location
    Grand Cayman Island
    Posts
    134

    Cool

    It depends on the line set. If the line set for the unit is precharged and the contractor does not cut it, the first responce is right.

    If the line set is cut or they run copper pipe the last one is correct. You need to evacuate the lines if they are exposed to the astompohere. Pressuring the lines checks for leaks and the vacum pump removes impurities and moisture.

    I would opt for the precharged lines if it is possible in your installation and request that they not be cut, if possible.
    [FONT="Comic Sans MS"]merken1[/FONT]

  9. #9
    How do you hook up those precharged line sets?
    Most units I saw were flare ftgs.
    And about my Fujitsu.........the ones everyone wanted to put their stickers on..........they are just jealous.
    Anyway, they didn't see my 1st floor unit, it looked very professional, if I must say so myself.
    Hey cockroach, don't bug me! ©

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    www.Pennwood-HVAC.Com

    Bring Em Home....

  10. #10
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    Originally posted by Diceman
    How do you hook up those precharged line sets?
    Most units I saw were flare ftgs.
    And about my Fujitsu.........the ones everyone wanted to put their stickers on..........they are just jealous.
    Anyway, they didn't see my 1st floor unit, it looked very professional, if I must say so myself.
    Some USED to have Aeroquip fittings.

    Personally, every single one I've ever seen have leaked.

    I'd discourage the use of precharged linesets.

    Fujitsu??????? Is that a compact car or something???

  11. #11
    Like I said.......jealousy..........
    Hey cockroach, don't bug me! ©

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  12. #12
    I ain't seen a precharged, quick connect line set in years.
    Hey cockroach, don't bug me! ©

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  13. #13
    i recently installed a nice fujitsu split system, the outdoor unit was shipped to the h.o. with a stiped flare fitting on the port, had to ship it back. ran like heaven once installed though!

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