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  1. #1
    Join Date
    Oct 2010
    Location
    Texas
    Posts
    41

    Mini-splits on interior walls

    What tips do you guys have on installing a mini-split on an interior wall? I have seen them on outside walls only. It could surely be done in a new construction, but how could you ever replace it or service it? Where to put the condensate pump?

  2. #2
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,905
    I serviced one a few days back that was on the interior wall the copper and drain line were ran during remodel it did not need a pump,you could not run new copper if needed

  3. #3
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    291
    They have condensate pumps for these applications

    http://www.sauermannpumps.us/nc/lite...ery.html?cat=1

  4. #4
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,768
    I have done it a few times... One needs to plan ahead for cleaning the drain. I try to run 3/4 PVC drain (same as a ducted system coil), and arrange a clean-out T as close to the mini 'head' as I can.

    The big issue IMO with a mini inside is: Condensate draining.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  5. #5
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,905
    Its best to tie the drain in to pvc securely that way you can hook a shop vac to the drain outside to clear it

  6. #6
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,353
    Quote Originally Posted by tharding54 View Post
    What tips do you guys have on installing a mini-split on an interior wall? I have seen them on outside walls only. It could surely be done in a new construction, but how could you ever replace it or service it? Where to put the condensate pump?
    First floor, drilled 2 1 1/2 holes. Clear drain hose connected to minisplit drain, to a pvc going across the basement. Wasn't easy. We spent ALOT of time measuring for the holes/spotting, due to hardwood flooring.

    Other time, used a condensate pump. Commercial business had a drop ceiling, so no big deal.

    Had a time where we mounted to a soffit, but I could get to it from the attic.

    NEVER NEVER NEVER put a minisplit on an interior wall, without some serious planning. If you can't get to the top of the wall without drilling holes, or have a clear open space under it, just don't do it.

    Have to tell a homeowner to tear out drywall for the installation of a minisplit is almost not an option. The entire idea of the minisplit is so you don't have to tear out any drywall to begin with.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  7. #7
    Join Date
    Jun 2011
    Location
    Detroit vicinity, Michigan
    Posts
    79
    There's a slick new pump that looks like part of the indoor unit and mounts to/directly below it, you just drop the drain tube into it and run your pump tubing with the lineset. It also had a large foam sponge filter on its inlet and seemed very serviceable, sorry I don't know the brand, but its being sold at Young Supply here in the Detroit area. I may be stopping at one tomorrow, I'll check again.

  8. #8
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,768
    Quote Originally Posted by Workin4TheMan View Post
    There's a slick new pump that looks like part of the indoor unit and mounts to/directly below it, you just drop the drain tube into it and run your pump tubing with the lineset. It also had a large foam sponge filter on its inlet and seemed very serviceable, sorry I don't know the brand, but its being sold at Young Supply here in the Detroit area. I may be stopping at one tomorrow, I'll check again.
    I think this is a 'Little Giant'... saw something similar a year or so ago at a supply house. Little thing which goes INSIDE the mini head. Sump did not look very big. Cost was something like $125 or so.

    I prefer gravity drains when I can... just a better idea to me.

    Just did one last week: Lineset, wire, and drain went up through a wall, and in the attic to the back of the wall where the head was installed. Other end of lines went across the walk in crawl to the outside. Both the conventional AC unit and the mini unit are in a big cage, bolted to the side wall of the crawl.
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  9. #9
    Join Date
    Aug 2008
    Location
    Burlington , Mass
    Posts
    470
    Most if not all mini's can be roughed in , from the left side before sheet rock. And if you need to remove the evap unit , it is easier to remove. Unlike when you have them on the right end and going directly outside.
    I'll be there when I get there and not a minute later

  10. #10
    Join Date
    May 2006
    Location
    Vancouver, U.S.A.
    Posts
    480
    Gobi pumps are pretty slick. I would use copper drain lines and dont terminate the drain line at a lower elevation than the pump. siphoning is a no no.
    www.youtube.com/watch?v=maH3nQkVUUg
    Air conditioning to all and to all a good night

  11. #11
    Join Date
    Aug 2011
    Location
    Salem Oregon
    Posts
    26
    We put 60 minisplits in an apartment building. Every one of them went onto a concrete interior wall. We ran all of the line sets in a paintable plastic snap together linehide system. It was pretty slick even if it did get pretty tight at times with 2 refer pipes an electrical flex and a 3/4 PVC condensate drain.

    One or two of the tenants complained that the line hides were crooked. I explained to the building owner that their engineer wanted the condensate in the linehide so ... It wasn't crooked. It was sloped.

    I went to a LG installer's certification class before that project. Many of the installations they showed just had line hide and that's what was there. The manufacturer wouldn't want to admit that it was a pain in the neck to put their product anywhere. They just wanted to impress people with how nifty it is to have a minisplit that doubles as a picture frame.

  12. #12
    Join Date
    Oct 2002
    Posts
    1,394
    Plan to install on a wall backing up to a closet or cabinet. Much easier to come through the back side and having a carpenter "trim out" the visible piping on the back side.

  13. #13
    Join Date
    May 2012
    Location
    Paola, Kansas, United States
    Posts
    54
    what is above and below and behind wall? If above a basement then spot wall below and drill a big hole and run drain and lines through basement. the biggest problem is fishing through the wall to unit location but if you drill a big enough hole in both location and bottom of wall you should be able to see clear through.

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