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Thread: LIQUID LINE

  1. #1
    I'm in the middle of a second floor addition and want to run a line-set for future air conditioning. I'm going to run the line-set within the walls from the attic to the first floor. My question is when the system is installed if the future will the liquid line cause condensation within the wall since it is not insulated? When I purchased the line-set I was told not to insulate the liquid line because it will affect performance on a typical split system.
    Please advise so I can run the line set and close up my walls.

    Thanks
    Gary

  2. #2
    Join Date
    Jul 2006
    Location
    N.Y., N.J.
    Posts
    129
    The LL is not commonly insulated ,however i have heard of some guys doing it in extreme conditions.

  3. #3
    Join Date
    Dec 2002
    Location
    Houston,Tx.
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    15,909
    Originally posted by zoom38
    I'm going to run the line-set within the walls from the attic to the first floor.
    This is the norm in Texas and I thought it was everywhere how else would you run them from an attic?
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  4. #4
    Finest, if it is common that the liquid line is not insulated then is it a given that the line will not condensate within the wall?

    MrBill, in my area it is quite common for the line-set to be run down the outside of the wall and not within the wall as I am going to do.


  5. #5
    Join Date
    Aug 2006
    Location
    Florida (some where) way-south
    Posts
    230

    Talking

    hey zoom dude that a fast name.

    anyway dude run the lines inside pvc pipe.
    protect them from small nails, and in future lines can be replace without a problem.
    make sure both ends of pvc pipe are cover/seal
    and yes dude don't insulate the Liq.line
    at lease not in the south.


    yes the suction line has to be insutated.

    if going to use pvc

    the pvc pipe large enough for both lines in the pipe
    and use 45 ell not 90
    and seal the ends pvc cap or foam-o-fill what ever.

    on a 2x4 should work but i don't think you need it,
    pvc that is.
    good luck



    [Edited by fix_it_dude on 12-03-2006 at 12:57 AM]
    doing one call at a time.


  6. #6
    Join Date
    Jul 2006
    Location
    N.Y., N.J.
    Posts
    129
    There are no givens or guarentees, there are conditions (usually service related ) that a LL can sweat or that extreme conditions can warrent the LL being insulated, i suggest having a profesional outfit do the work for you.

  7. #7
    Thanks guys for your thoughts.

    Dude I will give the pvc conduit some thought, don't know if its possible with a 2x4 wall.

    Finest, I don't know a professional who would come out to just run a lineset. I can't afford to have the AC system installed yet thats why im just running the line-set for the future.


  8. #8
    Join Date
    Nov 2004
    Location
    Naples, Fla.
    Posts
    1,403
    Line sets are fine in floors / walls. You'll never have an issue with a liquid line.... but you could have an issue w/ the suction line. If you read the specs, there are conditions that could allow the insulation to sweat IF there is not sufficient air for evaporation - the way to compensate for this condition is use the right wall thickness IE: use 3/4" not 1/2". Protecting the line set from future nails etc is common sense. Also a word to the wise would be to run more control conductors than you need for future issues.

    Pls call a contractor -- yes it'll be a few bucks, but at least it's done right B4 the walls go up.

  9. #9
    Join Date
    Feb 2004
    Posts
    2,597
    How do you know what size lines to run?

  10. #10
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,175
    Originally posted by billva
    How do you know what size lines to run?


    I was thinking the same thing as I read this thread.
    Perhaps you should have read the instructions before calling.

  11. #11
    Join Date
    Nov 2000
    Location
    Lancaster, Pennsylvania
    Posts
    884

    Wink Insulating LL's

    Inside a wall or floor, I would insulate a LL along with the SL. I have installed too many split systems(HP's and straight air) that have had high frequency vibration going thru the lineset. Once it's in a closed up wall/floor, it's too late. I believe you can get armorflex insulation down to pretty small I.D. sizes with small O.D. as well. We had one customer that complained and we were back on that job too many times which destroyed any profit we had made. Just my 2 cents.
    KX500......the original big green meanie

  12. #12
    Billva & Jrbenny, with the heat gain calculation using HVAC-Calc I came up with 3 ton. In reading up on it and talking to others I'm running 7/8, 3/8.

    DNA, I don't mind insulating the LL but will there be an affect in performance as I was told by another in the business?

  13. #13
    Join Date
    Nov 2000
    Location
    Lancaster, Pennsylvania
    Posts
    884
    Insulating the LL will not diminish performace. When its time to have your A/C system installed, be sure to have a professional contracting company install it. Ask for references and check them out. Any reputable dealer will not have a problem providing them.
    KX500......the original big green meanie

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