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  1. #1
    Join Date
    May 2020
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    1
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    Practical Consideration for line-set length?

    When designing a residence, I'm often faced with the choice of locating the compressor closer to the air handler in a less desirable location, or locating the compressor in a more desirable place (aesthetics, noise) with a longer lineset.

    Besides a simple "shorter is better", can someone explain what the practical considerations are, besides just the copper/refrigerant cost? Does it increase the energy cost to operate? If so, by how much?

    The compressor has to "work harder" but what does that mean? Will a compressor that would last 20 years with a 15' line crap out after 18 years with a 60' line?

    Or is the difference between a 60' lineset and a 15' lineset trivial in the day-to-day operation of a residence? From scouring the internet, it seems that 30, 50 and 70 are pretty common lengths. What about 100'? Is there a certain length where the performance falls off sharply and anything less than that will not make any practical difference?

    If there's a way to calculate this, can we get specific? Let's assume that we are talking about both AC+heat pump split unit in climate zone four with a 2.5 ton compressor. 15' line outside the MBR on the front. 70' line in the back corner near the kitchen. Besides aesthetics and noise, both of which favor the longer line, what are the design/energy/cost/maintenance/etc ramifications of this decision?

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    27,276
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    Is this a question from a book?

  3. #3
    Join Date
    Jun 2002
    Location
    nw ohio
    Posts
    255
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    Does this help? See page 5 for specific long line sets.

    https://tinyurl.com/ydygbdaw
    "Compressors never die; they're always murdered!" - Glenn Hannegan Jr

  4. #4
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    6,677
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    Check w/the unit Mfrg for their requirement for their equipment.

  5. #5
    Join Date
    Mar 2016
    Location
    Dayton Oh
    Posts
    2,346
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    Should be in the install manual. “Over x feet the suction needs to be y size”

    DuPont also has a piping manual that’s a good reference.


    Sent from my iPhone using Tapatalk

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