Mini split minimum line set length

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ChrisJ
ChrisJ Posts: 17,763
edited June 2025 in A-C, Heat Pumps & Refrigeration

Setting up to install a Daikin minisplit and I thought this comment in the manual was interesting. I thought the minimum lineset lengths had to do with charge and performance, not noise? So essentially, if you don't care about noise / vibration, then 5 feet is perfectly acceptable?

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Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

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  • GW
    GW Posts: 5,259
    edited June 2025

    correct

    years ago, we didn’t know about this general theory. And then one of the reps chimed in and says “minimum length for multi zones”.

    Technically, there’s a minimum for single zones, too, but we have never, ever had noise on a single zone. Actually, we did one job many years ago, basement install. We hung the wall unit, poked the whip through the wall, and flared right onto the outdoor unit. It was semi, comical, but it worked.

    When we install Multis, and the bedroom is close, we tend to roll the line set under the heat pump unit to get the 15 feet

    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com
    ChrisJ
  • Big Ed_4
    Big Ed_4 Posts: 3,585

    To add; They also want the extra coil laying to avoid traps ..

    There was an error rendering this rich post.

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