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  1. #1
    Join Date
    Sep 2004
    Posts
    654
    I got a 1.5 ton unit to replace. Old unit has 3/16"ID liquid line, but new 10 SEER unit has 1/4" ID line size. Both units run R22. One of our techs say use the old 3/16" line size is OK, I'd rather change out the line to what the new condensing unit has (1/4"). Total run is small, maybe 20 feet with minimal bends. Suction line size is the same amoung both units, if it matters.

    Whacha think?




  2. #2
    Join Date
    Aug 2003
    Posts
    509
    I always replace the line set no matter what even with a line drier i would not be confident.

  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,474
    What is old unit? Only thing I know of smaller than 1/4" was the old Lennox RFC system and you definitely need to get of that lineset.

  4. #4
    Join Date
    Feb 2004
    Posts
    2,597
    i'm guessing you haven't read the installation manual.
    try it, you will finds all kinds of info and required specs there.

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