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Mr. Cool DIY mini split install

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
A quick thanks to everyone here posting about mini-splits. I had mini splits installed in my last house (Fujitsu) in 2008 and they cost an arm and a leg. I just have not kept up with current technology since then.

With the advent of the DIY splits, I was a little hesitant to go that route. However, being a born and bred DIY'er, I was excited to find out that I had the opportunity to do this myself without the typical required installer tools (pump, flaring tools, etc).

I bought the 12,000 BTU 115v unit.

The biggest part of my job was removing the old 10k BTU wall unit, re-framing insulating and drywalling. I already had a 115v outlet with 12/2 right next to where I was planning on installing the condenser unit, so I removed that GFCI and installed a 20A light switch with a weatherproof cover.

I ordered the Mr. Cool unit on a Monday and had it by Thursday.

I decided to hang the condenser unit on the outside wall rather than pouring a small slab and placing it on the ground. Too much rain and mold here in SWFL. Plus we have gopher tortoises running all over and this is one less obstacle for them to navigate.

I did have to drill to extra 1/2" holes in the condenser bracket mounting arms so I could move the condenser unit all the way forward. By drilling these holes, the back of the condenser is now 18" from the wall. If I didn't drill these holes the back of the condenser would only be 10" from the wall. More airflow is better. I also picked up slightly longer stainless bolts, larger washers and a few extra neoprene washers since the ones supplied with the mounting kit were a little small for my taste. The modifications only took a second and a quick trip to my local ACE Hardware.

I didn't use the supplied lag bolts. I ended up using a few 3 inch "construction screws" and secured the bracket with those instead. This saved me from having to pre-drill. Plus the holding power is much better with the construction screws than traditional lags (these screws are made from better quality metal).

As far as the actual installation, there were absolutely no surprises. I "kind of" read the manual...it was a little hard of a read due to poor grammar and translation errors...but at least it gave me enough direction to move forward.

I used the supplied indoor mounting template and then marked my holes and mounting locations. A quick check with the level and the indoor mounting bracket was in place.

The install kit comes with a "through the wall tube" which makes installation of the lines very clean. I carefully bent the lines on the back of the indoor unit to shoot out the hole, making sure to keep the drain line on the bottom of the bundle. Just as they stated, two crescent wrenches were all I needed to connect the copper lines. I heard a slight movement of gas when I connected everything and opened up the valves on the compressor. I used a bottle with some kid's bubble liquid to check for leaks. Nada.

Turned the power on and bingo, and Bob's your uncle. Works great.

The most time consuming part (if you call it that) is figuring out how to coil the unused sections of line and then tape them up with the supplied wrap to make it look like a clean install.

A couple of hours later and I'm back to working in the shed! It's SO QUIET...my air purifier is louder! Compared to my old wall AC unit I can't believe I went so long without a mini split. I can actually hear myself think now. I initially set the temp to 64 and within a few minutes I froze myself out (it's 80 degrees here in SWFL today).

The condenser unit cycles on and off and you can hardly hear it at all. The indoor unit is whisper quiet.

And it dehumidifies perfectly.

I'm so glad I took the plunge and got rid of my wall AC...this DIY series from Mr. Cool rocks. Can't speak any more highly of it. Couple that with a 5 year parts 7 year compressor warranty...for just $1,000...how can anyone go wrong?







Happy holidays!

JC
 
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larry4406

Well-known member
Joined
Jan 27, 2006
Messages
18,986
Location
Northern Virginia
Nice.

I thought I read somewhere that the vertical coiled excess lineset traps oil. Others more knowledgeable than me I'm sure will chime in.
 
OP
J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
The unit comes with a 26 foot coil of tubing. By design it cannot be shortened. No flaring or filling required with this unit. The wrap came in the install kit. It's an insulated plastic wrap and does a nice job of cleaning things up.
 

walrus

Well-known member
Joined
Nov 12, 2008
Messages
11,673
Location
Maine
Nice.

I thought I read somewhere that the vertical coiled excess lineset traps oil. Others more knowledgeable than me I'm sure will chime in.
It will trap oil, I think most hvac pro's will have an issue with that. If it works, it works so....
 

WVBrady

Well-known member
Joined
May 5, 2005
Messages
1,679
Location
WV
It will trap oil, I think most hvac pro's will have an issue with that. If it works, it works so....

I found this: "Pre-charged lines with excess tubing should be coiled horizontally in an inconspicuous location to avoid oil trapping. Never coil excess tubing vertically ..."

supposedly from this: http://www.usair-eng.com/pdfs/long-line-piping.pdf
but I couldn't find it in the document.
 

streetdaddy

Well-known member
Joined
May 16, 2015
Messages
128
Location
Nashville,TN
Thanks for posting. My garage is nearing completion. I have one waiting to install. Glad it went in without a hitch. I was nervous about installing until now!
 
OP
J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
Streetdaddy,

I read and re-read everything because I was nervous as well. But when it came time to do it, it was a piece of cake. Super simple to install.

And I did contact Mr. Cool today and they assured me the excess lines can be coiled up behind the unit without causing damage (trapping oil). They have that 7 year compressor warranty on the unit. I'm certainly not sweating it...if I have it for 7 years and it blows up then that comes to about $13 a month.
 

crabjoe

Well-known member
Joined
Jul 15, 2012
Messages
197
Location
Ceciltucky, MD
I'm confused... How does this thing work with all the air in the line set? Especially down in FL where the air seems always to be so humid.

BTW, is the DIY only AC or is it a heat pump?
 

brewchief

Well-known member
Joined
Sep 20, 2008
Messages
2,370
Location
Michigan
I'm confused... How does this thing work with all the air in the line set? Especially down in FL where the air seems always to be so humid.

BTW, is the DIY only AC or is it a heat pump?

They use a special fitting on the line set that opens up as it is connected, the lineset will have refrigerant in it already.
 

Glivin

New member
Joined
Dec 1, 2015
Messages
4
Look very nice! I am still curious why split system is not popular in US. I am traveling a lot on Europe and Asia and saw only split AC which can work as additional heat source in mild winter.
 

Highbeam

Well-known member
Joined
Feb 15, 2011
Messages
2,292
Location
Mt Rainier foothills, WA
They should be more popular but they are too new. New means expensive, new means they look "weird" in a house where the standard installation is floor registers, and new means the HVAC industry isn't familiar with them.

The real question is why this split technology isn't being used to heat water for domestic or low temperature heating applications. Again, it is being used that way in other countries.
 

streetdaddy

Well-known member
Joined
May 16, 2015
Messages
128
Location
Nashville,TN
Any chance you could show me pics of electrical from outlet to the condenser? That part isnt very clear to me and instructions are weak.
 

Jay337

Member
Joined
Dec 29, 2015
Messages
12
A quick thanks to everyone here posting about mini-splits. I had mini splits installed in my last house (Fujitsu) in 2008 and they cost an arm and a leg. I just have not kept up with current technology since then.

With the advent of the DIY splits, I was a little hesitant to go that route. However, being a born and bred DIY'er, I was excited to find out that I had the opportunity to do this myself without the typical required installer tools (pump, flaring tools, etc).

I bought the 12,000 BTU 115v unit.

The biggest part of my job was removing the old 10k BTU wall unit, re-framing insulating and drywalling. I already had a 115v outlet with 12/2 right next to where I was planning on installing the condenser unit, so I removed that GFCI and installed a 20A light switch with a weatherproof cover.

I ordered the Mr. Cool unit on a Monday and had it by Thursday.

I decided to hang the condenser unit on the outside wall rather than pouring a small slab and placing it on the ground. Too much rain and mold here in SWFL. Plus we have gopher tortoises running all over and this is one less obstacle for them to navigate.

I did have to drill to extra 1/2" holes in the condenser bracket mounting arms so I could move the condenser unit all the way forward. By drilling these holes, the back of the condenser is now 18" from the wall. If I didn't drill these holes the back of the condenser would only be 10" from the wall. More airflow is better. I also picked up slightly longer stainless bolts, larger washers and a few extra neoprene washers since the ones supplied with the mounting kit were a little small for my taste. The modifications only took a second and a quick trip to my local ACE Hardware.

I didn't use the supplied lag bolts. I ended up using a few 3 inch "construction screws" and secured the bracket with those instead. This saved me from having to pre-drill. Plus the holding power is much better with the construction screws than traditional lags (these screws are made from better quality metal).

As far as the actual installation, there were absolutely no surprises. I "kind of" read the manual...it was a little hard of a read due to poor grammar and translation errors...but at least it gave me enough direction to move forward.

I used the supplied indoor mounting template and then marked my holes and mounting locations. A quick check with the level and the indoor mounting bracket was in place.

The install kit comes with a "through the wall tube" which makes installation of the lines very clean. I carefully bent the lines on the back of the indoor unit to shoot out the hole, making sure to keep the drain line on the bottom of the bundle. Just as they stated, two crescent wrenches were all I needed to connect the copper lines. I heard a slight movement of gas when I connected everything and opened up the valves on the compressor. I used a bottle with some kid's bubble liquid to check for leaks. Nada.

Turned the power on and bingo, and Bob's your uncle. Works great.

The most time consuming part (if you call it that) is figuring out how to coil the unused sections of line and then tape them up with the supplied wrap to make it look like a clean install.

A couple of hours later and I'm back to working in the shed! It's SO QUIET...my air purifier is louder! Compared to my old wall AC unit I can't believe I went so long without a mini split. I can actually hear myself think now. I initially set the temp to 64 and within a few minutes I froze myself out (it's 80 degrees here in SWFL today).

The condenser unit cycles on and off and you can hardly hear it at all. The indoor unit is whisper quiet.

And it dehumidifies perfectly.

I'm so glad I took the plunge and got rid of my wall AC...this DIY series from Mr. Cool rocks. Can't speak any more highly of it. Couple that with a 5 year parts 7 year compressor warranty...for just $1,000...how can anyone go wrong?







Happy holidays!

JC

Not sure how it works in the USA but here in Canada, if you claim for warranty you need to have the bill of the unit and the bill from the certified installer. Because everyone can install a mini split, but not everyone can install it the right way, so the company will not replace your compressor if you have a bad installation ( like trapping the oil because of your line are too long ;)or for exemple not doing a vaccum in the line and let the moisture and air in it that can be compressed by the compressor) This is not a malfunction of the unit or a bad compressor , it is because the installation was not right.

BTW if you have an Inverter compressor, the price can be as much as 800 $ cad or no inverter would be around 500$ Cad plus the labor time, replacing a compressor is about 4 hour at 90$/hour plus Taxes... I'll let you do the math.

I am a certified HVAC Mecanic here in Canada and this is how it works here and I'm pretty sure it works like this at your place, And futjitsu/Friedrich makes awesome hvac system and it is rarely faulty, so if you claim a compressor... I am 110% sure the company or the supplier will want to see the installation.

but if it works good job but I can't understand why you cheap on the installation with such a good system. that's my 2 cents
 
OP
J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
As of 4/19, my Mr. Cool is still working great. We've had several 85 degree days and it has been cooling like a champ. It'll freeze you out. Likewise, some mornings are in the high 40's and this unit will burn you out with the heat on.

It also does a good job of dehumidifying.

It's so quiet inside my space. The mount does pass through a little vibration (wall mount on wall studs) but I usually work with my stereo on and can't tell anyway.

I'm thrilled with this mini split! I'm planning on installing one in my guest cottage as soon as my wall unit needs replaced.
 
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helenvee

Member
Joined
Apr 29, 2016
Messages
7
I just bought one of these and am gonna install it in my 12x24 shed that I'm finishing out. I'm gonna get an electrician in the shed soon to run all the electrical for lights etc. The one thing I am confused about with the Mr. Cool is, how do you actually hook it up to power? I see in their instructional video how to connect the indoor and outdoor units together with the wiring, but they don't seem to ever say in the video where you connect the unit to power. I'm trying to figure out what I need to tell my electrician to set up for me. Does it just plug into an outlet or do I need a line run for it? And does it connect inside, from the indoor unit, or outside, from the condenser? Thanks.
 
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J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
Wiring is easy. It took me a few minutes to hook up the power.

The power connects to the outside unit. Additionally, my unit does not run off of a standard outlet...it is rated for 208-230v for operation. This is not a typical wall plug.

Best bet is to send your electrician the manual and he will know what to do.
 

helenvee

Member
Joined
Apr 29, 2016
Messages
7
Cool. Did you need a vacuum pump and leak detector to install it, like they say in the video? Did you already have these or did you buy them just for this job?
 

cre73

Well-known member
Joined
May 4, 2010
Messages
868
Location
Central Illinois
Cool. Did you need a vacuum pump and leak detector to install it, like they say in the video? Did you already have these or did you buy them just for this job?

For the MrCool diy system you do not need a vacuum pump. The line set is precharged also or at least vacuumed and sealed with ready to go easy connections. Leak test at fittings with soapy water after tightened.
 
OP
J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
For the MrCool diy system you do not need a vacuum pump. The line set is precharged also or at least vacuumed and sealed with ready to go easy connections. Leak test at fittings with soapy water after tightened.

Yup, exactly. Easy as heck.
 
OP
J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
Did you say how big your space is? I am looking at the same setup for my 600 SQft garage. Not sure exactly what size i need?

I'm in south Florida so our needs are very different. Just give the company a call and I'd bet they can help you with sizing.
 

Mclovin13

New member
Joined
Jun 5, 2016
Messages
2
Awesome information. Can't find many reviews for these units online. I'm picking up either the 36k or the 24k. Not sure which will work best. I have a wide open floor plan with high ceilings. Around 1800 Sq ft. I used a large window unit around 15kbtu and it did ok but couldn't keep consistent temp. Hoping one of these does the trick.


Glad it all worked well.
 

handymancanfixit

Well-known member
Joined
Aug 25, 2014
Messages
57
Location
Winston Salem, NC
Awesome information. Can't find many reviews for these units online. I'm picking up either the 36k or the 24k. Not sure which will work best. I have a wide open floor plan with high ceilings. Around 1800 Sq ft. I used a large window unit around 15kbtu and it did ok but couldn't keep consistent temp. Hoping one of these does the trick.


Glad it all worked well.

Just my 2 cents....for an 1800 sq. ft. area, I would definitely go with the 36k unit. I have a 1500 sq. ft. garage and I will be purchasing the 36k unit.
 
OP
J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
It's been about 12 months now since I installed my Mr. Cool mini-split.

This past summer was extremely hot here in Southwest Florida and the unit ran perfectly. Kept things nice and cold.

No issues whatsoever. I'm still very pleased with my purchase.
 

Hornman

Well-known member
Joined
May 9, 2013
Messages
517
Location
Southwest DFW
Thanks for the update. We appreciate it.

When I went to air condition my shop, I let my HVAC contractor talk me out of installing a mini-split. I had installed several in computer rooms at work with excellent results, but he had no experience with them. Once again my first instinct was right but I allowed myself to be talked out of it.
 

onecleanride78

Active member
Joined
Apr 16, 2016
Messages
32
It's been about 12 months now since I installed my Mr. Cool mini-split.

This past summer was extremely hot here in Southwest Florida and the unit ran perfectly. Kept things nice and cold.

No issues whatsoever. I'm still very pleased with my purchase.
Where did you get yours if you don't mind me asking? I'm in South Texas so I'm still looking at ac units while everyone else is installing heaters!

Sent from my SAMSUNG-SM-G935A using Tapatalk
 
OP
J

JCSWFL

Member
Joined
Nov 12, 2015
Messages
15
It's been about 3.5 years now since the Mr. Cool mini-split install. It made it through the hurricane in 2017 that went right over the top of my house @ 137mph. The unit lost it's colling ability about 4 months ago. I read this was a common thing as most of these DIY kits don't come fully charged to begin with. After a little research I found a minisplit recharge kit for under $100. Only took a couple minutes to fill it up and it's been great ever since. Still the best purchase I've made to date.
 
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