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Mini-split Outdoor unit locations questions

jpcjguy

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Jan 6, 2014
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1,480
Location
Richmond, VA
Hi all,

So I am reviewing my options for the outdoor units for two 24k mini splits.
My electrical panel is on the front wall and I have already run two 10/3 wires ( had some available) from the panel to two junction boxes that are just above the top plate on the back wall. So when I am ready for them, wiring should not be too difficult. Just pull back a little insulation, drill through a top plate and snake it down about 5-6 feet in the outside wall. If you look at the pic of the back wall, you can see my initial thoughts. The red vertical line is the split between the scissor truss for the lift bay to left and the attic truss to the right. So basically the electrical wiring needs to be to the right of the line to be easy. Oh - and the blue box for the indoor unit on the right is actually further down the wall, but I could not show that because of the shed. The front view of the garage is better representation. I figure I cannot have that outside unit right behind the indoor because it would be in the alley way between the garage and the shed. There is only 4 feet clearance and not enough for the unit.
My inspector says the disconnects cannot be more than 6' 7" from the ground to the actual handle or switch.
How about the spacing of the outdoor units from each other? Any best practices there? I am thinking about 5 feet off the ground or so, mounted on the walls.
Anything else I should consider?
 

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yeldogt

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Jan 2, 2012
Messages
18,184
Seems like a lot of cooling -- 4T for that size building?

I did a 30k unit on a wall -- I can hear it ramp in the winter. I will not do another.

If the walls are open why not get the line-set in ? You say in the back -- never going to be visible? they get ugly quick
 
OP
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jpcjguy

Well-known member
Joined
Jan 6, 2014
Messages
1,480
Location
Richmond, VA
Seems like a lot of cooling -- 4T for that size building?

I did a 30k unit on a wall -- I can hear it ramp in the winter. I will not do another.

If the walls are open why not get the line-set in ? You say in the back -- never going to be visible? they get ugly quick

There will be a gym on one side of the building and it will be nice for my wife to use an app to get it up to temp for her quickly - hence the two units....

Not worried about ugly - it truly is the back right next to my neighbors property. Only storage back there.
 
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kelpaso1

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Sep 28, 2009
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New Brunswick
Do not mount the outside unit directly to the garage wall with brackets. I did that to mine and it vibrated the whole wall and was very annoying. After a month of that I put a 2ft X2ft concrete patio block on the ground and made a metal stand to sit it on that and put the outside unit on top of that. Isolated it from the wall and is now silent inside my garage.
 

yeldogt

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Jan 2, 2012
Messages
18,184
There will be a gym on one side of the building and it will be nice for my wife to use an app to get it up to temp for her quickly - hence the two units....

Not worried about ugly - it truly is the back right next to my neighbors property. Only storage back there.

What's the sf -- so you are using it for the heat ?

BTU's are BTU's ..... large setbacks often don't save much money w/ heatpumps.

AC is as much about humidity as it is dropping temp .... w/o running the unit as designed the humidity may be an issue and an oversize unit will not remove water as effectively. The turn down is different depending on model
 
Last edited:

justinjoyal

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Apr 30, 2015
Messages
888
Location
Quebec
What's the sf -- so you are using it for the heat ?

BTU's are BTU's ..... large setbacks often don't save much money w/ heatpumps.

AC is as much about humidity as it is dropping temp .... w/o running the unit as designed the humidity may be an issue and an oversize unit will not remove water as effectively. They turn down is different depending on model


I have advised OP in another of his thread that 4 ton is too much but he appears to have made his mind up.

Actually I believe he had a loadcalc showing a 1 ton cooling load !
 
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