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  1. #1

    Liquid line 5/16 inch vs 3/8 inch

    Hello,

    Again, thanks for all of your good advice, it has been helpful.

    I have one additional question after having a new install.

    I was told by the contractor before the install that the line set wouldn't have to be changed. He said he would flush out the lines when changing from R-22 to the 410a.

    Even though the run is 25 feet or under and the lines would have been easy to change out, I consented since he said the sizes would be the same.

    After the install, I noticed that where they brazed or connected the XL 16i to the liquid line was bigger on the air conditioner side.

    I measured and found out that they brazed the 3/8 inch line to my existing 5/16 inch line.

    My units are:

    Trane XL 16i 4TTX6036
    Trane Furnace TUH2B080A9V3 2 stage 95% efficient 80,000 BTU
    Coil- 4TXCB004

    Looking at the installation documents (from Trane online), I find that the XL 16i calls for a 3/8 inch copper liquid line and the coil also calls for 3/8 inch.

    I brought this up with the installer and he said that it wouldn't matter because it was only 25 feet in length.

    I'm more of a precision guy and would use what is called for regardless of wiggle room.

    I calculated the volume of liquid in 3/8 in 25 ft tube vs 5/16 in 25 foot tube and came up with 32.97 and 22.98 cubic inches respectively within the distance of the line. These calculations are based upon the formula V= Pi x r2 x length.

    I don't really understand whether the flow rate or volume make a difference in the liquid line, but if they do then there is around 30% less liquid in the smaller 5/16 inch line.

    This may be picky and I really don't know, but I'm concerned.

    I still wonder though if this could void my warranty, affect the efficiency of my system or cause additional wear and tear and lesson the life of my $ new system!

    I'm wondering if I should demand the correct liquid line size or perhaps take up the matter with Home Depot (their contractor) or Trane?

    What do you guys think?

    Best,

    Hammer
    Last edited by beenthere; 08-21-2012 at 06:31 AM. Reason: price

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