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Location recommendations for minisplit heads

Brian Croston | Posted in Mechanicals on

I know it’s been asked many times, but would appreciate suggestions on locating the head units for two minisplits in my ‘pretty good house’. I have attached the floorplan. Some things to note on the house:

– Climate Zone 6b, southcentral Montana
– majority of windows are on the east side for the river view
– windows and doors are double-pane. South windows are high SGHC for solar gain
– first floor concrete slab
– underslab = R20, walls = R40, roof = R60, windows = R4

The intention is to have one unit on the first floor to provide the majority of heating and another on the second floor to provide cooling. I will likely go with the Fujitsu cold weather units.

I have strongly considered a floor-mount unit on the first floor, perhaps along the NE or SE corners to direct heat along the east wall, but not sure how to drain condensation with a floor mount and slab. Any ideas on that? The second floor would be a wall mount, near the ceiling.

many thanks, all

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Replies

  1. User avatar GBA Editor
    Martin Holladay | | #1

    Brian,
    If your upstairs ceiling is high enough, and your closet door is low enough, perhaps you can mount the second floor unit above the closet door.

    .

  2. Brian Croston | | #2

    Thanks Martin,
    Those locations are what I was thinking as well. The second floor ceiling is standard 96" finish height below the 2x4 ceiling chase, so there should be around 14-15" above the closet door. This should be just enough as the head unit is ~12" high. Do you have any ideas on dealing with condensation in a floor mount unit on the first floor slab or is not an issue if it's only used for heating?

  3. User avatar GBA Editor
    Martin Holladay | | #3

    Brian,
    The lineset of the floor-mounted indoor unit (refrigeration tubing and condensation piping) exits through the wall at the rear of the unit above the slab. The illustration below is for a floor-mounted Mitsubishi unit.

    More info here:
    http://meus1.mylinkdrive.com/files/MFZ-KJ09-18NA-U1_Installation_JG79Y071H02_02-16.pdf

    .

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