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  1. #1
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    Jul 2016
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    Luxaire HL20 vapor line size

    Installing a Luxaire HL20 variable speed compressor heat pump.
    Have to use the existing lineset as It is built in through the finished house and no real way to run new.
    The existing lines are 3/8" & 7/8" about 70ft with 20ft rise to the evaporator.
    Luxaire calls for 3/4" vapor line. Is the 7/8" line going to cause me oil return issues or will I be OK since the compressor is lower then the evaporator. Would normally install new lines but in this case not really possible.

  2. #2
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    Jul 2007
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    Quote Originally Posted by gskinner View Post
    Installing a Luxaire HL20 variable speed compressor heat pump.
    Luxaire calls for 3/4" vapor line. Is the 7/8" line going to cause me oil return issues or will I be OK since the compressor is lower then the evaporator. Would normally install new lines but in this case not really possible.
    You didn’t specify a tonnage.

    I would suggest you get on your favorite search engine and type in- “York piping and application data sheet”.

    When the results pop up, select one and look at the page that lists “suction piping capacity reduction chart” for your tonnage. The 2.5 to 4.0 ton units list both 3/4’ and 7/8” suction line and their specs.
    Instead of learning the tricks of the trade, learn the trade.

  3. #3
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    Jul 2016
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    Thread Starter
    Quote Originally Posted by rundawg View Post
    You didn’t specify a tonnage.

    I would suggest you get on your favorite search engine and type in- “York piping and application data sheet”.

    When the results pop up, select one and look at the page that lists “suction piping capacity reduction chart” for your tonnage. The 2.5 to 4.0 ton units list both 3/4’ and 7/8” suction line and their specs.
    Sorry it is a 3 ton unit.

  4. #4
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    Quote Originally Posted by gskinner View Post
    Sorry it is a 3 ton unit.
    So from the chart I mentioned, you should be O.K. with the 7/8" suction line @ 70 feet. The velocity will still be over 1000 fpm, and you can expect a 2% capacity loss.
    Instead of learning the tricks of the trade, learn the trade.

  5. #5
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    Jul 2016
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    Thread Starter
    Thanks for the help. I just read the document and came to the same conclusion as you did.

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