View Poll Results: Should the liquid line be insulated on a split system with a heat pump?

Voters
22. You may not vote on this poll
  • Never (please state reason)

    2 9.09%
  • Yes, if the line is on a hot rooftop

    6 27.27%
  • Yes, if the line is in an unconditioned space

    6 27.27%
  • Not for performance, but it protects the line a little and looks better

    2 9.09%
  • It doesn't really matter

    7 31.82%
  • Yes, if you want to waste the money.

    4 18.18%
Multiple Choice Poll.
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Results 1 to 13 of 17
  1. #1
    Join Date
    Jun 2009
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    Albuquerque NM
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    2,476

    POLL: Insulating liquid line on a heat pump system.

    Should the liquid line be insulated in a split system with heat pump? What say you?

    (Sorry, the poll question should say "should the liquid line be insulated", not just "should the liquid be insulated". Maybe the mod can fix this, I can't edit it.)
    Do wah diddy diddy dum diddy do

  2. #2
    Join Date
    Jun 2009
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    Albuquerque NM
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    Only 2 votes, and no opinions?
    Do wah diddy diddy dum diddy do

  3. #3
    Join Date
    Feb 2010
    Location
    In a boiler room
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    6,915
    The now defunct Hallowell International had a specific btu value per foot lost when the liquid line wasn't insulated. But then they were running the heat pump down to -20.

    I can't see it making very much difference, but I insulated the liquid line on my heat pump.

  4. #4
    Join Date
    Jun 2009
    Location
    Albuquerque NM
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    My take on it, from everything I've read, is that it effects performance slightly, and that effect is negative for cooling and positive for heating. In both cases the difference is minimal.
    Do wah diddy diddy dum diddy do

  5. #5
    Join Date
    Feb 2010
    Location
    In a boiler room
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    6,915
    Quote Originally Posted by garya505 View Post
    My take on it, from everything I've read, is that it effects performance slightly, and that effect is negative for cooling and positive for heating. In both cases the difference is minimal.
    I agree.

  6. #6
    Join Date
    Aug 2000
    Location
    Central Oregon
    Posts
    749
    Just a guess, No. Not on equipment that is not of an variable operating nature. That would be able to control refer flow both in heating and A/C.
    If you think our goverment is screwed up. You haven't lived in another country.

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    66,818
    Fixed the Poll title.

    No need to insulate it.
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  8. #8
    Join Date
    Jun 2002
    Location
    Dacula, GA
    Posts
    12,033
    It wouldn't hurt to put it next to the suction line and cover both with your suction line insulation if you have a split add on black insulation. That would be fine but otherwise I wouldn't worry about it. Thank you very much
    "I could have ended the war in a month. I could have made North Vietnam look like a mud puddle."
    "I have little interest in streamlining government or in making it more efficient, for I mean to reduce its size. I do not undertake to promote welfare, for I propose to extend freedom. My aim is not to pass laws, but to repeal them."
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  9. #9
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,051

    Insulated "Liquid" lines..................



    I always insulate liquid lines. Most of my linesets run through spaces that "can be" warmer than the liquid line temperature on a design day. Subcooling is a very important part of system performance. A few extra dollars spent to help eliminate flash gas is a cheap insurance policy. I guess I could also spend the extra buck and time and install a pressure tap at the unit so I could actually measure the pressure drop and know for sure what amount of subcooling would "really" work
    Some Talk, Some Do
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  10. #10
    Join Date
    Jun 2005
    Location
    Winston-Salem NC
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    1,133
    I do what the manufacturer says. Saves me a lot of issues down the road.

  11. #11
    Join Date
    Jun 2009
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    Albuquerque NM
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    2,476
    Quote Originally Posted by stonewallred View Post
    I do what the manufacturer says. Saves me a lot of issues down the road.
    Here's what it says in the manual for my York YHJF heat pump:
    "The vapor line must be insulated with a minimum of 1/2" foam rubber
    insulation (Armaflex or equivalent). Liquid lines that will be
    exposed to direct sunlight and/or high temperatures must also be
    insulated."

    Unfortunately they don't say what "high temperatures" means, exactly.
    Do wah diddy diddy dum diddy do

  12. #12
    Join Date
    Aug 2008
    Location
    S. Grand Prairie
    Posts
    244
    I also follow manufacturer's recommendations...if they say to do it, it gets done. If it's not specified, then no.
    Originally Posted by ladyfire3374:

    "I used to wake up excited about the challenges of the day. Now the anticipation level is somewhere between a root canal and a colonoscopy."

  13. #13
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
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    4,051
    Quote Originally Posted by garya505 View Post
    Here's what it says in the manual for my York YHJF heat pump:
    "The vapor line must be insulated with a minimum of 1/2" foam rubber
    insulation (Armaflex or equivalent). Liquid lines that will be
    exposed to direct sunlight and/or high temperatures must also be
    insulated."

    Unfortunately they don't say what "high temperatures" means, exactly.
    A high temperature is warmer than your liquidline................
    Some Talk, Some Do
    "keeping condensing pressures low and evaporator pressures high"
    Comfort is my goal
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