mini-split indoor units
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  1. #1
    Join Date
    Jun 2012
    Location
    Northern NJ
    Posts
    10

    mini-split indoor units

    Greetings.

    One of my customers would like to install air conditioning. They have hydronic heat and the house is relatively small. I thought that a mini-split would be ideal. The problem is that most indoor units are 35 to 45 inches wide and I just don't have a home for this. Does anyone know of an indoor unit that is about 24 inches wide. I would be installing this in a free standing closet and blowing the conditioned air out the top into a great room. I probably could install a conventional system, however, because the closet is in the living space, I am concerned about the sound level. Suggestions would be appreciated. Thanks

  2. #2
    Join Date
    May 2004
    Location
    Austin, TX
    Posts
    1,733
    I can't think of a single model that is only 24" wide.

  3. #3
    Join Date
    Jul 2012
    Location
    Dillwyn, VA
    Posts
    43
    Maybe a window unit

  4. #4
    Join Date
    Dec 2006
    Location
    Litchfield,Il
    Posts
    565
    There has to be a place somewhere on an exterior wall. If you have that many windows your in trouble.
    If your not getting the results you desire then change. People change from either desperation or inspiration.

  5. #5
    Join Date
    Jun 2012
    Location
    Great lakes
    Posts
    41
    I know I installed a mini split that was a ceiling mount, can't really rember the name brand tho. But they are out their

  6. #6
    Join Date
    May 2012
    Location
    San Diego, CA
    Posts
    352
    I couldn't find one for Mitsubishi but LG has wall frames and ceiling mounted ones... I am sure all the other manufacturers do too...

    http://www.lg.com/ca_en/air-conditio...tial/index.jsp
    You can call me Sam

    It should be a crime to be a mechanical engineer in San Diego
    Summer Design Temperature: 83 F Dry Bulb ~ 69 F Wet Bulb (California Climate Zone 7)

  7. #7
    Join Date
    Jul 2012
    Location
    Dillwyn, VA
    Posts
    43
    Mitsubishi makes a flush ceiling mount air handler unit

  8. #8
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,819
    We did a 3 head Mitsu system a few months ago. Due to no place to put a wall unit, one room got a floor mount. Rather pricey but what we had to do.

  9. #9
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Is there an attic?
    If so, some of the mini split manufacturers make ducted air handlers.
    If more government is the answer, then it's a really stupid question.

  10. #10
    Join Date
    Jun 2012
    Location
    The Woodlands, Texas
    Posts
    64
    I did a lot of HVAC work while I was in the US Army and most of it was with European and Asian mini split systems.

    All of the big brands (Mitsu - Fujitsu - LG) would offer you two options.

    A small air handler type unit, that would fit in an attic or a crawlspace, and feed ductwork.

    There is also what is called a ceiling recessed unit, that mounts flush with the ceiling.

    Tony

  11. #11
    Join Date
    Jun 2012
    Location
    Northern NJ
    Posts
    10
    The room to be conditioned is a great room with a cathedral ceiling ... no attic. The only exterior wall has a fireplace and a pair of windows ... no space for an indoor unit. The other 3 walls are either covered with furnishings or are archways to other rooms. This is the reason that I chose to put a unit in a closet that separates the great room from another part of house. This closet is 24" deep on the interior and about 40" wide; the 24" side is adjcent to great room. I had cosidered putting a ducted evaporator in the closet, but they all seem to be 35 to 42 " wide ... thus it will not fit. I also considered using one of the ceiling mounted units that are about 24" square. To do this I would have to mount it upside down on top of the free standing closet. I understand that this will not work because drainpan will not catch condensate. Further, these units will not handle the 2 ton that I think we need.


    At this point, I think the closet will get a conventional air handler that takes air in at the bottom of the closet and blows it out the top toward the top of the cathedral ceiling. I am concerned with noise levels as the closet is only about 7' high which means the blower will be close to the supply and return to the living space. I'm considering a 2 stage compressor so it can run at a low speed most of the time an only run high when necessary. I have not found documentation concerning what controls the speed.

    Is it possible to run a mini-split compressor with an conventional air handler? I don't know what kind of control signals are available to get these 2 units to work together and to modulate speed when necessary. Further, I don' know if any manufacturer woud warranty such a configuration.

    I appreciate \your thoughts and thanks for comments to date.

  12. #12
    Join Date
    Jun 2012
    Location
    The Woodlands, Texas
    Posts
    64
    Quote Originally Posted by Sir-Fixalot View Post
    The room to be conditioned is a great room with a cathedral ceiling ... no attic. The only exterior wall has a fireplace and a pair of windows ... no space for an indoor unit. The other 3 walls are either covered with furnishings or are archways to other rooms. This is the reason that I chose to put a unit in a closet that separates the great room from another part of house. This closet is 24" deep on the interior and about 40" wide; the 24" side is adjcent to great room. I had cosidered putting a ducted evaporator in the closet, but they all seem to be 35 to 42 " wide ... thus it will not fit. I also considered using one of the ceiling mounted units that are about 24" square. To do this I would have to mount it upside down on top of the free standing closet. I understand that this will not work because drainpan will not catch condensate. Further, these units will not handle the 2 ton that I think we need.


    At this point, I think the closet will get a conventional air handler that takes air in at the bottom of the closet and blows it out the top toward the top of the cathedral ceiling. I am concerned with noise levels as the closet is only about 7' high which means the blower will be close to the supply and return to the living space. I'm considering a 2 stage compressor so it can run at a low speed most of the time an only run high when necessary. I have not found documentation concerning what controls the speed.

    Is it possible to run a mini-split compressor with an conventional air handler? I don't know what kind of control signals are available to get these 2 units to work together and to modulate speed when necessary. Further, I don' know if any manufacturer woud warranty such a configuration.

    I appreciate \your thoughts and thanks for comments to date.

    Most mini-splits, have what are known as inverter style compressors. This is how they work.

    They convert the 240v, 60hz AC, into DC. Then they INVERT that DC into 240V AC, 5 to 120 HZ.

    This allows the compressor to be almost INFINITELY variable. When the room cools down, it cranks down to 5 HZ and just trickles in the refrigerant.

    Because of this, you will not be able to interface it with a normal air handler.


    Most of the big Mini Split manufactures, however, make small air handler type units.

    They also have outdoor condensing units, that can connect up to 8 (the most that I have seen) indoor units.

    You might also want to check out a product from LG, called their ART COOL.

    It is an indoor unit that mounts on an interior wall, that looks like a picture frame. Well, it is an actual picture frame, and you can put whatever picture you want in there.

    it is about 4 to 8 inches thick and it looks nice if placed well.

    It also gets up into the 20 SEER range.

    If you have anymore questions, please feel free to ask.

    Tony

  13. #13
    Join Date
    Jun 2011
    Location
    New Mexico
    Posts
    18
    Mitsubishi makes a 2-ton vertical air handler that is 18" wide and 21" deep. It would connect with a 3-ton condensing unit. It is from their City Multi line, which allows multiple evaporators with a single condenser.

    http://usa.mylinkdrive.com/uploads/d..._Submittal.pdf

    http://usa.mylinkdrive.com/uploads/d..._Submittal.pdf

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