DIY Ductless Mini Split Install – MrCool Unit

DIY Ductless Mini Split Install – MrCool Unit


so on my property I have this beautiful
shed that really isn’t being used for anything other than miscellaneous store
is for odds-and-ends it’s such a shame because it looks much more like a tiny
house rather than a normal shed with that I have decided to turn it into
guest quarters so that when somebody’s staying here
they’ll have their own accommodations and space of course what the be in Texas
AC is a must so that is my starting point
installing a mini split now with the space being pretty small and it’s only
168 square feet I’m going with the only do-it-yourself mini split on the market
currently it’s made by a brand called mr. cool I started by clearing out a
walking path and work area on the wall where I’ll be mounting the inside unit
which is called the air handler then taking some measurements to make sure
the unit would fit I used a stud finder to locate and Mark
the studs inside this back wall then remove the bracket on the back side of
the air handler and started pre drilling 4 holes to mount it when placing this
bracket I lined up one column of holes to be in line with the stud and this
leaves the other side shy of the next stud however so with one screw holding
the bracket in place and a level on top I pre drilled the hole locations for the
second column of screws that wouldn’t hit a stud in this way I could remove
the single screw I placed in the bracket and tapping some wall anchors I made
sure that these were flush and then remounted my bracket next I started
lining out where I needed to drill a hole in the wall for the plumbing that
will connect the inside unit to the outside one these units are supposed to
come with a template but I wasn’t able to locate mine it’s no problem though I
measured over from my left row of holes six and a half inches and made a mark
then I found a circle that was three and a half inches in diameter and traced
around it to cut this out I could have used a hole saw but I didn’t have a
three and a half inch bit so I went with a jigsaw instead I used a drill bit to
punch a hole big enough for my blade to fit in then neatly cut around my pencil
mark that takes care of my inside hole now I need to go to the outside and cut
another one that’s perfectly in line with it if you’re wondering that is my
mother’s finger when you’re punching the center hole of the
inside circle make sure that your bit is long enough to go through the entire
wall and also punch through the outside wall this way you can go to the outside
trace you get another circle that is three and a half inches in diameter and
then cut it out with a jigsaw with a hole cut all the way through I took the
plastic sleeves that come with the unit and test fitted it now they do come
along so that they can fit through a variety of wall thicknesses so I made a
mark on mine where it needed to be cut down then used a jig saw to cut it to
length I place this on the inside hole then capped it off on the outside and
now I have a smooth passage for all of the plumbing of the unit to pass through
the wall so the thing about mini splits is that they are pretty simple to
install but it takes professional equipment to charge their refrigerant
lines the mr. coil unit though comes with the line set this long white line
already charged for you this makes the unit DIY a bulb but it
also means that it comes with a stock length of line set that can’t be cut
down so keep in mind when you’re picking out your location for it that you’ll
need to coil up and stow away in the excess line once I fed through the start
of the line set I paused and also fed in the drainage line this will drain out
any condensation and moisture that the unit creates I push one end through the
wall then connected the other end to the back of the unit making sure to give it
a few tugs and see that it wasn’t going anywhere oh and also it doesn’t say it
in the instructions but there is a plastic corner cap on the backside of
the unit that you need to remove and that’s what allowed the units you mount
flush to the wall whenever you get it up on its bracket having two sets of hands
for this part makes this go a lot easier my mom was around and offered hers up
she got on the outside of the shed and pulled the line as I was on the inside
feeding it through take your time especially if you’re going up a ladder
to get this entire line through without kinking any of those hard lines
let me get up on my stool a little bit just gentle pools at this point now just
try to pull the rigid line if you can’t you just pause for a second once you get
close it is incredibly simple to get the air handler on the mounting bracket as
it how they live that you can set it on and then just let it hang really awesome
once the top is hung you need to make sure the bottom is in line with with
that line stepping inside of its space and then push on it until it snaps into
place and that is the inside unit done but before jumping out to wire in the
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April thank you simply safer keeping all of my tools safe now let’s get outside
to wire in that unit I’m comfortable tackling the simple wiring on my own so
I pulled off the covers and started by wiring in a powerline I purchased
outdoor flexible conduit called liquid tight and this came with a 90 degree
fitting on one end and a straight fitting on the other it also had wires
routed through it went bourbon and me from having to buy a power cord and fish
it through man I just had to strip the ends and
crimp on some Spade connectors in the other knockout I ran in the wiring from
the line set and this comes with a connector already wired on for you I
first terminated the line input ground and neutral wires and this was as simple
as backing off of the screw slipping in that Spade connector I attached earlier
and then tightening back down then I connected the output line which goes up
to the air handler using that simple push together connector they already
wired on and that’s it so next I pushed everything inside so I could close the
cap and reattach it with the screws I moved my unit down to the corner of my
building so that it would open up the back and that’s not only gave me a
better airflow but it also gave me a sneaky spot to coil up my extra line set
and stow it away I don’t currently have power out here so temporarily or maybe
permanently I’m gonna be running it off a quiet generator stowed away in this
little cranny of the building however instead of plugging directly into the
generator I first wired in a fuse disconnect box there’s a fuse which adds
a layer of protection between the unit and the power source so that if there’s
trouble the fuse will trip before damaging the unit after mounting the box
I used one of the bottom knockouts to wire in the other end of the power cord
that runs the outdoor unit finally on the remaining knockout I purchased a
heavy duty extension cord I cut off the female end strip back the ends and wired
it in and I didn’t leave a ton of cord here because honestly the generators
gonna be set right in the spot alright getting down to the end so hang in there
one of the final steps was to try to blend in that line set to the side of
the shed and I found this Raceway material specific for line set at a
local HVAC shop and it was hard finding one that sold to the public so if you
have trouble I know that there are similar products you can purchase
through Amazon once I tidied that up and knew the unit wasn’t moving I finally
connected the line set to the unit with these lines being pre charged you can’t
disconnect these lines once you connect them or how to get professionals out to
recharge the lines so before removing the protective caps and making
connections just make sure the unit is where you want it to be there we go
that is a drastic improvement over yesterday still need some painting on
the trim that I had to put in but the lines that comes out goes down the
Raceway coiled up the excess back here got it all wired in put it in a
disconnect and eventually a generator will go here then I can plug the unit
into whenever I want to use it you even buried the drain line that comes out other than paint that’s a job done and
that’s it overall it’s a very easy install probably the hardest part is
tidying up that line set and honestly it’s not that difficult to do if you’re
looking to install a mini split then I hope this video has helped you out and
of course if you have any questions on what I used in the video there are links
to you down below stay tuned as I do more projects converting the shed into
guest quarters I’ll see you soon welcome to simply safe thank you

100 Replies to “DIY Ductless Mini Split Install – MrCool Unit”

  1. April, ALWAYS connect the ground terminal FIRST. When disconnecting, always disconnect the line power, then the negative (neutral). Lastly, disconnect the ground. Stay safe!

  2. What kind of installation? The outdoor unit is not fixed, stands on the concrete, there is no normal blowing. Long work will not be this unambiguously.

  3. Installation by the professional will likely quadruple the cost of that a/c. But you still have know or ask for proper way to do it.

  4. Thanks Greece…i just put one in..first A.C.. I'm hiring professional to do vacuum, cut and flare line set…he wanted $750…im like What..another $700 You would of done all…In the states they charge way to much to install.

  5. Is there insulation in the wall? Seems kind of useless to install an ac, when the heat can get right in again through the wall

  6. We install these all the time and she made it look easy its a pain when u gonna run new wires to a breaker box and go threw a 8 inch wall filles with concrete and then cut the copper both ends and make new flares because the mitsubishi mini split says we have two and add a drop of oil to the flare to make a good seal but glad u was able to do it like a pro

  7. Hai, i think you need to keep the pipe insulated. That mean more thicker sponge with reflective aluminium that keep cooler air transfer or transported to the room, which help you to save a lot energy and cost.

  8. Soo how is it doing? I’ve looked and only seen not good reviews for mr cool mini splits. And since it’s already been 100+ in Texas I’m in San Angelo how’s it cooling that space

  9. Another install video discussed the need to coil that long line horizontally because when it is coiled vertically, if there is condensation, etc. it flows to the bottom and blocks the flow of air – at least that is my understanding of what they posted.

  10. Not credit at all to the pooch!! that poor pooch probably did about 90% for the hard labor!! Great video by the way!

  11. A friend of mine just installed similar unit. Only issue I would point out is that it doesn’t have a fresh air intake. Old fashioned wall unit will allow for either fresh air or recirculate. Both room size and lack of wall and ceiling insulation should be taken into consideration when sizing. Friends seems to struggle to adequately cool space.

  12. Your unit should have had a vacuum test run to purge the lines of all moisture prior to charging the unit. Any competent professional would perform this before charging a unit. This eliminates moisture that will turn to acid and ruin the unit over time. 

    Next, get rid of the garage door. The lack of insulation and solar gain will make the job of cooling very hard on that unit.

  13. What a lovely woman 🙂 and yes there is refrigerant in both outside an inside units. All you do is connect them. No need of a vacuum. The lines are insulated so the loss of efficiency is minimum.

  14. Why does Mr. Cool provide such a long line set? It seems to me that if someone needs that much line set, they should look into a different solution. I would never want that much line set coiled up in or out or my house.

  15. Honestly, this was great to see. My wife and I currently live in Japan and had to buy two units for our current home, but when we get back we were planning on installing them in the house we have stateside. Luckily, the ones here in Japan are powered from inside the house so we just have to plug them in. Great and informative video. Thank you!

  16. Congratulations on your excellence as a teacher… and your videography and audio quality is superb. I notice the inefficiencies; it seems the walls are without insulation in your shed; and I wonder if that glass door is "low e." You ought to protect 100% of that freon line and the electrical feed from sunshine; I suggest radiant barrier material easily bought on Amazon. Clad that dull-metal raceway with shiny aluminum (shiny side OUT) and you'll keep the interior cavity temperate… cooler in summer, warmer in winter. I'm in SoCal and you're in Texas and we both have serious heating from sunshine.

  17. You are seriously my girl crush. One day… I want to grow up to be you… or at least develop your mad maker skillz!

  18. I think you have to draw down a vacuum on the wall-mounted unit and the tubing that runs to it before you hook it to the compressor? I know it' s precharge, but I think only the compressor is precharged.
    I don't think you have to add refrigerant unless you're running over 20ft.
    If that's true you may as well cut the copper lines to a more appreciate length.

  19. Great job, looks awesome and love that shed! That’s the nicest ‘shed’ I’ve ever seen to just put ‘stuff’. The inspector bought into that! Don’t forget to strap down the electrical at least 12” from any connector. Great job!

  20. At 6min 36 you appear to be screwing black wire to Live and Red to Neutral. In UK that would be the wrong way. Is your Black = Live?

  21. April I love the video's but some things should be done by professionals who work with HVAC and Have a 608 Like my self. I see many things worng with this but I tip my hat to you giving it you're best anyway !

  22. How can you didn't cut off the excess of line set? I least you should strapped it due to the unit vibrations. It looks pretty odd but you got my respect for doing yourself without a Man's help

  23. You’re a very capable young lady who really knows what is what. Excellent video with no wasted words and your smile makes it way better, overall. Two thumbs up!

  24. you get more shit done by 10am than most guys do all day, keep up the good work, oh and why do most guys think that they are smarter than the manufacturer? I bet these ass-hats don't even know what a BTU is without looking it up lol.

  25. Hi, I had a guy installed my AC unit, very similar to yours, he placed the condenser in a room that I use for storage, but I don't wanted there, I wanted place in the outside corridor. He said that I need a condenser pump to disperse the water created by the unit. Does that sound right to you? I don't see such pump in your installation. can you explain.

  26. Great video. I have one comment. The way you installed your line set, it probably won’t drain out the condensate adequately. It is gravity flow so the drain needs to go downhill and should have been placed on your right side and slanting downward. I am only telling you because I mad that mistake before and filled my wall with water.

  27. I appreciate your DIY efforts but this is something that should be installed by a professional. All units should be started properly by verifying pressures, amp draw, etc. This should not be advertised as a DIY project.

  28. We just put a Mr. Cool in our garage apt ourselves about the same time as you. We had electricians do the electric since it's a new build and part of the gig. It's August now and it's nasty dirty. It has an herbaceous smell. I'm now purchasing the whole cleaning system with the wacky water collection into a bucket. I'm amazed at how dirty it's gotten in such a short period of time.

  29. The unit is a 110 volt, why install a 30 amp disconnect? The company recommends a 20 amp breaker and 15 amp disconnect.

  30. Just make sure that the compressor unit is mounted on rubber pads and bolted down so it can't 'walk away' due to vibration!!

  31. Great Job . You are right sometimes the Hvac companies don't wannna sell the unlicensed person, I used a 4" down spout or leader I purchased from home depot.

  32. Kudos for taking on this task, i might add, you need vibration mitigation, some sort of rubber pad. Don't be afraid to call an HVAC person, this is a cheap recovery cut and recharge job

  33. LOVE women that can do things themselves. That's why I married to lady I am married to for 40 yrs. We are a TEAM and that comes in handy when you have a small farm too. Thanks for the info. and the GREAT video. All Information and no Fluff or BS. Good going girl, you ROCK.

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