Line set sizing?
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  1. #1
    Join Date
    Jun 2008
    Location
    Southern,N.J
    Posts
    1

    Line set sizing?

    What affects or damage can occur when running smaller diameter lines for a discharge or suction line? I know deff higher head pressures. I'm new to the field experts please chime in..Also new to the site hello everyone..

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,627
    Lower capacity
    Lower efficiency
    Possible shortened compressor life.

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  3. #3
    Join Date
    Sep 2003
    Posts
    139
    If the suction line is too small, you may not get proper oil return to the compressor. You also can have a reduced capacity.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    An undersize vapor line doesn't hurt oil return.
    Too large of a vapor line can.
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  5. #5
    Join Date
    Sep 2003
    Posts
    139
    WOW! I hope you don't do refrigeration! OOPS... Read it wrong Beenthere! Need to assure proper velocity Horizontal increase size, vertical decrease.
    Last edited by heatingairman; 07-06-2008 at 10:12 PM. Reason: Read wrong

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,627
    Both A/C and refrigeration.
    A vapor line 1 size undr will never hurt oil return.
    The next size up however can on installs with the condenser vertically above.

    Recommended min suction line velocity is 1000 FPM. I have vapor line sizing charts for unit that allow the vapor line to be sized for up to 3000 FPM.

    I don't have any that approve less then 800 FPM. And they don't want a vertical rise to the condenser.

    If you have line set sizing charts that allow 500FPM velocity in the vapor line, post them.
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