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Thread: Line Sizes

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  1. #1
    Join Date
    Jun 2008
    Location
    Perry Village, Ohio
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    164

    Line Sizes

    Just curious. I saw this in a different thread, but never saw an answer to it and it has me wondering.

    On the condenser outside, there are two lines running out of it with the cool gas and the warm gas. Why do you see reducers in the lines at times? Someone had stated that it would make the unit inefficient. If so, why do installers do it then and should I have a professional replace the lines if they are reduced in size?

  2. #2
    Join Date
    May 2008
    Location
    North Texas
    Posts
    105
    A 7/8" line uses 1.5 times as much copper as a 3/4". Installers do it because either the general contractor or the homeowner tells them that so and so will do the job for less than a realistic bid.

  3. #3
    Join Date
    Jun 2008
    Location
    Perry Village, Ohio
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    164
    So, to make things more efficient, should I have a HVAC pro come in and upsize my lines if they have reduces in them?

  4. #4
    Join Date
    May 2008
    Location
    North Texas
    Posts
    105
    First he needs to look at your equipment and the lengths of the lines, along with some other things. Then a determination can be made as to the proper size of the lines. It's not guessing, the manufacturer has tables.

  5. #5
    Join Date
    Jun 2008
    Location
    Perry Village, Ohio
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    164
    Okay, but I would assume that the mfg also didn't say to step down? I mean if they made a port a certain size, I would assume that is the size the line should be, not something smaller? Or am I just not understanding something?

  6. #6
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
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    3,350
    Sometimes smaller lines will be reused for whatever reason if they are cleaned and the line run is a short distance (i.e. 25 ft. or less). Where are these reducers that you see? Right near the unit? Are you saying that a bigger line is becoming smaller, or vice versa? A picture might help.

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