Space for Wall Mount Mini Split

[theMezz]

I am shopping for split mini AC

My question is how much space is needed from the to of the window frame to the ceiling to mount a
wall mount mini split heat pump handler
like the MSZ-GL06NA-U1 ?

 

[Dana]

If you look on p4 of this document you'll see that the mounting plate for the GL06 is 10.0" from the bottom edge to the tip of the point in the center, but only 9-1/8" height to the corners.

If you look on p3 of this document you'll see that it needs 3/8" clearance at the bottom, and 2-1/8" to what appears to be the line point to the corner, not to the tip of the tab.

So total minimum distance from trim to ceiling is 3/8" + 2-1/8" + 9-1/8"= 11-5/8", but if the drawing is ambiguous it might need another (10" - 9-1/8"= ) 7/8", which would make it 12-1/2" .

 

[Sponsor]

 

[theMezz]

If you look on p4 of this document you'll see that the mounting plate for the GL06 is 10.0" from the bottom edge to the tip of the point in the center, but only 9-1/8" height to the corners.

If you look on p3 of this document you'll see that it needs 3/8" clearance at the bottom, and 2-1/8" to what appears to be the line point to the corner, not to the tip of the tab.

So total minimum distance from trim to ceiling is 3/8" + 2-1/8" + 9-1/8"= 11-5/8", but if the drawing is ambiguous it might need another (10" - 9-1/8"= ) 7/8", which would make it 12-1/2" .

AWESOME
thank you so much

 

[theMezz]

I have under 12 inches.. so I guess it won't fit!
Looks like a floor mount unit for me (that really mounts on the wall)

 

[Reach4]

I have under 12 inches.. so I guess it won't fit!
Looks like a floor mount unit for me (that really mounts on the wall)

There is no need to mount a mini-split evaporator above a window. https://www.ecomfort.com/Mitsubishi-MSZ-GL06NA-U1/p65039.html calls the part number you cited above a wall mounted unit.

Also, you may want to consider a regular mini-split unit rather than a multi-zone system.

 

[Dana]

I have under 12 inches.. so I guess it won't fit!
Looks like a floor mount unit for me (that really mounts on the wall)

I think the real dimension is 11-5/8", it's just that the drawing isn't layed out like a true mechanical drawing, so it's ambiguous.

Mitsubishi doesn't make a half-ton floor mount- smallest they have is a 3/4 tonner. Oversizing for bedrooms is not recommended with multi-splits. When other zones are calling for heat the bypass refrigerant is still flowing through the other heads even when nominally "off", which can lead to overheating/overcooling the spaces. Tread cautiously, and calculate the loads carefully.

It's fine to mount the high-wall units lower down (it's even more efficient in heating mode to mount them low), but they stick out into the more than floor mount coils.

 

[theMezz]

very useful information
thank you

 

[Stuff]

It would take more work (framing and piping) and more money but what about a ceiling recessed mount?

 

[theMezz]

I think it would be really difficult - its a loft kind of room in an attic . .not much room above the ceiling
I'll ask my next 2 contractors coming in for quotes
getting 5 quotes - and I normally do not go with the lowest on jobs

 

[Dana]

It would take more work (framing and piping) and more money but what about a ceiling recessed mount?

The smallest ceiling cassettes they make are 3/4 tonners, all of which would be oversized for a room that called for a GL06. (Even the GL06 is oversized for most bedrooms by at least 2x.) They do make a uni-directional ceiling cassette series designed to fit between 16" o.c. joists, but the smallest in that series is also a 3/4 tonner the MLZ-KP09. But it's a lot less framing work than the 4-way ceiling cassettes.

Some of the 4-way ceiling cassettes can be fitted with ducted output for at least 2 of the sides (maybe 3- I haven't dug too deeply into that option) to split output with other rooms, but the return path is still up the center, and adequate return paths would need to be provided between the remote rooms and the room with the cassette. I don't know if ducted splitting of output is a possibility with the MLZs (I'm guessing not.)

[edited to add]

Just looked- none of the SLZ or MLZ have a branch duct option- that's a PLA series thing, and it's a maximum of 2 sides.

 

[Stuff]

Good point about the 3/4 ton minimum. So would branch ducts for these be more of a solution for a larger open area to get better air circulation?

 

[Dana]

Good point about the 3/4 ton minimum. So would branch ducts for these be more of a solution for a larger open area to get better air circulation?

The throw of the 4-way ceiling cassettes is quite good, so it doesn't really make sense to duct to a diffuser grille/register within the same open space. I'm not sure when they are most commonly used, but the branch ductable PLA cassettes are targeted at commercial & retail markets. A large open office area might have doored off offices that could be served by the branch ducts rather than zoning them separately. The smallest branch-ductable PLA ceiling cassette is the 1-ton PLA-A12, with 14,000 BTU/hr heating, 12K cooling.

That's enough to heat & cool a reasonably tight code-min 800-1000' house (the whole house) in my area, and extreme overkill for a sub-code loft room that can be managed with a GL06 wall blob.