Questions about DIY Install of Mini-Splits - Page 5

AC_Hacker · 01-30-14, 11:03 AM

Quote:

Originally Posted by nokiasixteth

What would you say best place to mount the outside unit would be ? Wall or pad ? I see X ringers is leaning on his a bit

I would definitely advise against mounting your Outside Unit to the wall of your house, unless your house is of massive masonry construction.

Reason is that your Out Door unit will run at many frequencies and it will resonate parts of your house if attached.

If you attach the Outdoor Unit to a concrete pad, even a concrete pad close to your house, you will be unaware that it is operating.

That would be a good thing.

-AC

Xringer · 01-30-14, 12:15 PM

Wall mounts have been discussed here (somewhere) at great length.
My vote is to avoid low frequency resonate vibration, by not using wall
mounts on walls near occupied areas.

We have intermittent humming noise in the bathroom, because of a sheet of Coroplast that I'm using for a rain roof.
It's taped to the wall and held on the top cover by tape and a small metal bracket.
Since it's a thin flexible plastic sheet, it's sound conductivity is minimal.

PS: While you can hear the buzz in the bathroom, you can't hear it outdoors.
The wall acts like part of a large sub-woofer.

The Coroplast is conducting certain frequencies of sound/vibration into the bathroom.
Luckily, the noise level is low, so it's not heard in the bedrooms.
If it was mounted directly on the wall, I'm sure it would sound like an old wall-shaker (window AC).

pinballlooking · 01-30-14, 12:21 PM

MY Geer 9,000 btu is mounted outside right behind our heads when we sleep. I mounted it to a cement pad. You cannot hear it in the bed room.

nokiasixteth · 01-30-14, 12:30 PM

Sounds like the best place then is a cement pad then . The frequency prob would loosen up nails if put on side of a house .

Do you have yours on cement and wood Xringer ?

AC_Hacker · 01-30-14, 12:53 PM

Quote:

Originally Posted by nokiasixteth

...Sounds like the best place then is a cement pad then . The frequency prob would loosen up nails if put on side of a house...

It's not really the the nails that hold your house together that's the problem, it's the nails that hold your head together that is the problem.

-AC

woody · 01-30-14, 01:41 PM

I would definitely build some kind of little roof for the compressor. Yours is cute :-)

I plan on making a pad similar to the one I made for my oil tank. Not to high off the ground. The house is on 3ft. stilts at this end so the tank had to be up pretty high. I'll probably build it a foot or so above ground.

woody · 01-30-14, 01:52 PM

By the way......
I plan on using small cement footings with pier blocks so the pad will not be connected to the wall.

nokiasixteth · 02-05-14, 09:33 AM

Just poured a cement slab for my mini . Its right outside the bedroom window but that is one of the walls that has insulation in it. Hardest part so far was puttin the inside unit on the mount. Almost never got it done .
It came with something called neoprene. Anyone have a clue what in the world it would be used for ?
Is there a certain vac pump that you would need to use for a mini split ?

AC_Hacker · 02-05-14, 11:47 AM

Quote:

Originally Posted by nokiasixteth

Just poured a cement slab for my mini . Its right outside the bedroom window but that is one of the walls that has insulation in it. Hardest part so far was puttin the inside unit on the mount. Almost never got it done .
It came with something called neoprene. Anyone have a clue what in the world it would be used for ?
Is there a certain vac pump that you would need to use for a mini split ?

OK... some people just hook up the lines and tighten the nuts and release the refrigerant into the inside unit, without doing anything, and they say that it works just fine... at least at first.

However, there is moisture in the air inside the indoor unit. That water can corrode the insides of your system, and shorten its life.

Go back an read Xringer's thread on how he did his install, because he did it correctly. It will answer a question like, "Is there a certain vac pump that you would need to use for a mini split?"

Look at it this way, you already invested money in the machine, so protect your investment.

-AC

AC_Hacker · 02-05-14, 12:49 PM

Quote:

Originally Posted by woody

I would definitely build some kind of little roof for the compressor. Yours is cute :-)...

Woody,

The size of your images is not very cute.

There is nothing in the images that warrants 2592 x 1944 pixels, or the time it take to load the images.

You need to learn to reduce the size of your images to something like 640x480 pixels. Your computer has tools like paint, or something. You need to learn to use the tools.

Bandwidth is not free.

-AC

01-30-14, 12:15 PM	#42
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Wall mounts have been discussed here (somewhere) at great length. My vote is to avoid low frequency resonate vibration, by not using wall mounts on walls near occupied areas. We have intermittent humming noise in the bathroom, because of a sheet of Coroplast that I'm using for a rain roof. It's taped to the wall and held on the top cover by tape and a small metal bracket. Since it's a thin flexible plastic sheet, it's sound conductivity is minimal. PS: While you can hear the buzz in the bathroom, you can't hear it outdoors. The wall acts like part of a large sub-woofer. The Coroplast is conducting certain frequencies of sound/vibration into the bathroom. Luckily, the noise level is low, so it's not heard in the bedrooms. If it was mounted directly on the wall, I'm sure it would sound like an old wall-shaker (window AC). Attached Thumbnails __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less.. Last edited by Daox; 01-30-14 at 12:31 PM..

01-30-14, 12:21 PM	#43
pinballlooking Super Moderator Join Date: Jun 2013 Location: SC Posts: 2,923 Thanks: 172 Thanked 564 Times in 463 Posts	MY Geer 9,000 btu is mounted outside right behind our heads when we sleep. I mounted it to a cement pad. You cannot hear it in the bed room. Attached Thumbnails Last edited by Daox; 01-30-14 at 12:31 PM..

01-30-14, 12:30 PM	#44
nokiasixteth Journeyman EcoRenovator Join Date: Jan 2014 Location: Earth Posts: 348 Thanks: 43 Thanked 14 Times in 13 Posts	Sounds like the best place then is a cement pad then . The frequency prob would loosen up nails if put on side of a house . Do you have yours on cement and wood Xringer ? Last edited by nokiasixteth; 01-30-14 at 12:34 PM..

01-30-14, 01:41 PM	#46
woody Lurking Renovator Join Date: Jan 2014 Location: Cave Junction, OR Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts	I would definitely build some kind of little roof for the compressor. Yours is cute :-) I plan on making a pad similar to the one I made for my oil tank. Not to high off the ground. The house is on 3ft. stilts at this end so the tank had to be up pretty high. I'll probably build it a foot or so above ground. __________________ ---------------------------------------------- Cave Junction, OR 97523 so I got my numbers at: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. I used a balance point of 65 degrees. So 2012 was: HDD@65=5552 CDD@65=190 TDD@65=5742 And 2013 was: HDD@65=5982 CDD@65=271 TDD@65=6253 550/600sq. ft. Should be about 12000 BTU Doing research on a 12,000 btu ductless split air system To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. ---------------------------------------------- Last edited by woody; 02-05-14 at 01:37 PM..

01-30-14, 01:52 PM	#47
woody Lurking Renovator Join Date: Jan 2014 Location: Cave Junction, OR Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts	By the way...... I plan on using small cement footings with pier blocks so the pad will not be connected to the wall. __________________ ---------------------------------------------- Cave Junction, OR 97523 so I got my numbers at: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. I used a balance point of 65 degrees. So 2012 was: HDD@65=5552 CDD@65=190 TDD@65=5742 And 2013 was: HDD@65=5982 CDD@65=271 TDD@65=6253 550/600sq. ft. Should be about 12000 BTU Doing research on a 12,000 btu ductless split air system To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. ----------------------------------------------

02-05-14, 09:33 AM	#48
nokiasixteth Journeyman EcoRenovator Join Date: Jan 2014 Location: Earth Posts: 348 Thanks: 43 Thanked 14 Times in 13 Posts	Just poured a cement slab for my mini . Its right outside the bedroom window but that is one of the walls that has insulation in it. Hardest part so far was puttin the inside unit on the mount. Almost never got it done . It came with something called neoprene. Anyone have a clue what in the world it would be used for ? Is there a certain vac pump that you would need to use for a mini split ?