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  1. #1
    Join Date
    Dec 2006
    Location
    new england
    Posts
    627

    New install question..

    We're installing 2 new Trane split heat pumps. Twe090d 7-1/2 and twe120d 10 ton with matching indoor ahu's. I'm reading the install manual and noticed that Trane recommends 5/8 liquid for the 7-1/2 and 1/2" for the 10 ton. I can't see why they'd want a larger liquid line on the smaller capacity unit. Any thoughts??? TIA Fitz


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  2. #2
    Join Date
    Dec 2006
    Location
    new england
    Posts
    627
    I think I'm going to just run 5/8 on both systems. Total line length is maybe 30'...


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  3. #3
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    888
    Weird.. Im currently doin 3 10ton carriers, and according to there sizing chart they want 1/2" which to me seemed small, but i talked to carrier and they said 1/2, so i went with it. Im assuming this is 410

  4. #4
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    888
    5/8 will be fine tho

  5. #5
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    450
    Could it be a mistake in the spec. Is the suction also 1-3/8" for both? It doesn't make sense either way.
    It is possible that they are concerned about the velocity and proper oil return.
    I have a piping chart which is in Excel format. I will try to convert it and upload next post. If you want I can email it maybe.

  6. #6
    Join Date
    Dec 2006
    Location
    new england
    Posts
    627
    New 410 system. Yes both suctions are 1-3/8. Install is this weekend. I ordered 5/8 for both systems.
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