Wiring mr cool mini split

Wiring mr cool mini split DEFAULT

How-To: MRCOOL DIY Mini Split Installation

Just when you think your HOT and HUMID night out in the garage can’t get any worse, the mosquitoes swarm in from the open garage door!

Enough was enough, it was finally time to get some air conditioning! And not just any old window shaker, a proper mini split that is efficient and super QUIET!

Enter MRCOOL, a heat pump operated mini split that can offer BOTH heating and cooling functions to an interior space. A “mini split” consists of an air handler inside, and a condenser placed outside. You hook up both with a lineset that carries refrigerant.

Now normally this type of install would require a HVAC professional to perform the install, which adds $$$ to the project….big time! Well, with the MRCOOL Diy system, this is a job that you can totally do yourself. In fact, I did the entire job myself with the exception of having my wife help me carry the 100 pound condenser outside (my back is not the best LOL). So the part that makes this system DIY friendly, is the precharged lineset that takes 2 adjustable wrenches to assemble. It doesn’t get any easier than that. However, the lineset is only available in 25′ at this time, so plan your install accordingly.

MRCOOL Products In This Video

MRCOOL Diy 3rd generation E star 18k

Lineset guard kit (I used 2 kits for my run)

MRCOOL MB176 wall bracket

MRCOOL smart controller (so you can use the smartphone app)

MRCOOL mini thermostat (this replaces the remote if interested)


The instructions for the 18k unit state the 12ga wiring must be used, along with a 20A breaker. Since this unit is 220V, I ran 3 wires (2 hots and a ground). Also, the wiring is super easy since everything is labeled.

12ga THHN black

12ga THHN red (I used yellow since I had some leftover)

12ga THHN green

Helpful Resources

I think the most challenging part of this install for most people will be the electrical work. Below are some links that will help you out.

Non contact voltage tester (detects live electrical wires easily)

Conduit bending theory (I learned how to bend conduit from this site)

Conduit fill calculator (can’t have too many wires per code)

Wire ampacity chart

Wire lube (everything is a little better with lube)

Sours: https://howtomotorcyclerepair.com/mrcoolminisplitinstall/

How to Install a Mini-Split

  • Installing a Solid Base for the Outdoor Unit

    A solid mounting area is needed for the outdoor unit. We decided to pour our own concrete pad for the unit which was 2ft x 4ft. This took about six 80lb bags of concrete. We first removed the top soil, then framed out the pad and leveled the frame, followed by mixing the concrete, pouring into the frame and using a board to screed it flat, filling all the low spots. Once the concrete started to set up a bit, I troweled it smooth. Unfortunately, the dog walked over it not once, but twice. Luckily there is a big unit sitting on top of the paw prints.
    Another option is to attach a mounting bracket to the side of the building. However, we needed to get it as low as possible due to a window above it. 

    Mr Cool Mini Split Install 1

  • Roughing in the Electrical

    Luckily, we still had access to all the interior walls so we pulled a 10 AWG, 3 conductor wire with ground from the panel, through the interior walls to the location we were going to install the outdoor unit.

    Then, we drilled a hole in the exterior wall, and attached weathertight conduit to a 30 amp fused disconnect box which is where we connected the end of the 10/3 wire to.

    Mr Cool Mini Split Install 2

  • Mounting the Indoor Unit

    Now it was time to move inside and mount the indoor unit. Since we have no drywall I need to attach a 1/2″ piece of plywood to the studs. This piece was made slightly smaller than the footprint of the unit so that when drywall is installed it would fit right behind it. 

    Then, the mounting bracket was leveled and screwed to the plywood and studs. Next, I cut out a spot for the lines to run, attached the drain line to the unit and mounted the indoor unit in place. 

    Mr Cool Mini Split Install 3 1

  • Routing the Piping and Drain

    In most other cases this unit would be mounted to an exterior wall and the lines would be routed through a hole in that wall and outside. However, since we have access to the walls and have some dead space behind the unit to route the excess lines we were able to have the lines exit the building right where they need to be. 

    The bundle come with a cylindrical sleeve that can be cut down to length and used to seal the hole off nicely. The lines are then ran through this hole and outside to the exterior unit. 

    The drain line is also routed through this hole, however, extra care must be taken to make sure the drain line is pitched appropriately and drains freely with no traps in the line. Since my line was mostly ran on the interior of the building I needed to insulate it to make sure the line didn’t sweat.

    Mr Cool Mini Split Install 5 1

  • Sealing the Exterior Wall Penetration

    After finalizing the routing I then sealed up around the sleeve and inside of the sleeve with spray foam insulation to prevent any outside are from getting in.

    Mr Cool Mini Split Install 7

  • Installing the Outdoor Unit

    The outdoor unit is already in place but we needed to make sure it didn’t move around so we anchored it to the slab using Tapcons with the rubber vibration pads in-between the unit and the concrete.

    Mr Cool Mini Split Install 9

  • Wiring the Outdoor Unit

    Within that white sleeve there is a black electrical line that runs back to the indoor unit. That gets connected to the outdoor unit and provide power to the indoor unit. There is a white connecter and a ground wire that are used to do so.

    The power to the outdoor unit from the 30 amp disconnect is ran using a preassembled liquid tight conduit. The wiring is already there and it can be cut to length. The red and black wires are both hot wires and will connect to the L1 and L2 lines using yellow crimp on fork connectors. Then, all that’s left is the ground wire that gets connected to the metal plate below the connections.

    Mr Cool Mini Split Install 8

  • Connecting the Refrigerant Lines

    The refrigerant lines get threaded onto the connections. They are both different sizes, so you can’t screw it up. Once they are tighten down you can then remove the caps on the side of the lines to expose an allen wrench key that gets turned until it stops to release the refrigerant in the lines and pressurize the system.

    This is the part of the system the differentiates it from other mini-splits. With most other units the refrigerant is added after the fact using a system that most professionals have. Having the refrigerant in the lines and being able to pressurize your own system makes this process totally DIY.

    Mr Cool Mini Split Install 11

  • Inserting the Fuses

    Now the 30 amp fuses can be inserted into the fused 30 amp disconnect. Do note that the fuses do not come with the disconnect. They have to be purchased separately. 

    Mr Cool Mini Split Install 16

  • Bringing the Wire into the Panel

    Lastly, you’ll need to tie the wire into the panel. If you don’t feel comfortable doing this, by all means, hire a professional. I am not a licensed electrician and don’t claim to be. Also note that the photos below show a panel that is currently under construction so there are a lot of wires that are not tied in yet. 

    To start, the main breaker (big switch at the top) needs to be turned off, the face of the panel can then be removed and the insulation should be removed from the wire after it enters the panel.

    Mr Cool Mini Split Install 12

  • Connecting the Ground and Common Wires

    Then, the ground wire gets stripped and tied into the ground bar. This is usually towards the outside of the panel. While the white wire (common wire) gets tied into the common bar which is usually near the breakers.

    Mr Cool Mini Split Install 15

  • Installing the Breaker

    Now for this breaker we will be using a 30 amp double pole breaker. This means that two wires are hot. So two 110 volt wires will travel to the unit and provide a combined voltage of 220. Therefore, both the red and the black wires get stripped and tied into the breaker. 

    The break then gets inserted into an open slot on the panel. Not all panels are the same so yours may look a little different. 

    Once you get the breaker in you can then replace the face of the panel and flip the main breaker back on. This should complete the install.

    Mr Cool Mini Split Install 14

  • Adding the WIFI Adapter

    This is pretty straight forward, there is a usb adaptor that gets plugged into the back of the front panel. Flip up the front panel to expose it and plug it in. Once you run through the steps in the app you’ll have the unit connect to your wifi which will allow you to set up schedules, monitor the required maintenance, and enable “follow me” mode which make you unit aware if you are in the building or not and heat or cool accordingly.

    Mr Cool Mini Split Install 17

  • Sours: https://rogueengineer.com/how-to-install-a-diy-mini-split/
    1. Jasmine rice price per pound
    2. Paw patrol: volume 13
    3. Cast iron lantern candle holder

    How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Done Son
    Do-It-Yourself mini-split heat pumps have become very popular since they work very well and are perfect for the Do-It-Yourself type person.

    They save money since no HVAC company is needed and work very well at heating and cooling room additions, garages, or most any place heating and cooling is needed.
    How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 1

    MRCOOL is one such mini split manufacture that makes it easy for a DIY mini-split project.
    How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump
    Recently one was sent to me which I made a video of installing along with this post.

    The video is at the bottom of the page for a visual walk-through.

    One of the things that makes MRCOOL units different from other mini split kits is there is no need to vacuum down the lines.

    Most units need a vacuum pump and gauges to pump the line-set down before releasing the refrigerant.

    MRCOOL line-sets are already in a vacuum and have a seal that is broken when bolted onto the outside condenser.
    How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi 2
    They have a seal that opens once the line-set is tightened on the outside condensing unit.

    This makes it much easier to install since there is no need to vacuum / pump down the system.

    All the parts come in three boxes except for the AC electrical which needs to be bought separate.
    How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi
    The boxes come with everything needed for the setup including the inside wall unit, outside condenser, line set, wrenches, and hole saw.

    Things not included is electrical, mounting pad, and line-set cover which need to be bought separately if needed.

    *This post contains affiliate links.
    MRCOOL Mini Split Availability
    Available Here on Amazon

    Available Here on eBay
    Electrical Not Included
    Like all mini-split kits, the electrical is not included and needs to be bought separately.

    Every electrical setup will be different since the location of the unit and power always changes.

    If you have no idea how to wire the unit be sure to call a professional.

    The unit will need 115 Volts with a 20 Amp breaker.

    This is a common voltage/amps for rooms and garages.

    Of course, running its own breaker to a panel is ideal and the best option when possible.

    I decided to tie into the existing wiring in the garage I install the unit in which has a 20 Amp breaker.
    How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Wireing
    I installed a disconnect to run power to the unit.

    I also have 240-volt outlet in my garage so wont need to pull much of any more amperage from the 115 outlets.

    Of course, I can always run a dedicated line later if there is a problem.

    Electrical Parts I Used From Amazon
    1… Siemens WN2060U Non-Fused AC Disconnect
    2… Diversitech Conduit Whip, 1/2-Inch x 6-Feet

    The steps below are how I installed a MRCOOL Mini Split. Be sure to follow the instructions that come with your unit.

    How To Install MRCOOL DIY Ductless Mini-Split Heat Pump

    1. The first step is to layout where the inside and outside unit will be located.
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 1
      A 3 1/2 inch hole will be drilled through the wall to run the refrigerant line-set and control wires.

      Also, the AC wiring must be thought out for the best way to get power to the unit.

    2. Once the location is known the wall bracket needs to be leveled and mounted on the wall.
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 2
      This will hold the inside unit so be sure to mount it on some good studs.

      A template is included in the kit to mark out and drill the 3 1/2 inch hole.

      A hole saw is also included to drill out the hole once marked.

    3. Once the wall bracket is mounted and the hole drilled the inside unit can be placed on it
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 3
      First, run the line-set and control wires out the hole and the inside unit will clip onto the bracket.

      The line-set is 25 feet so most of it can be fed out the hole before picking the inside unit up.
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 3.1

      The inside unit will clip on to the bracket.

      If possible it would be best to have two people when setting the inside unit.

      I placed the unit on my own and it is not hard but pushing the last of the line-set through the wall and clipping it into place would be much easier with two people.

    4. The outside condensing unit will need a solid flat surface to sit on.
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 4.1

      This can be done with a small cement pad, store-bought pad, or with bricks.

      I decided to use bricks but any method will work as long as it is solid and level.

      Here is an Example Pad On Amazon that also looks and works well.
      Diversitech EL3232-2 E-Lite Plastic Condensing Unit Pad, 32x32x2″

    5. The 2 refrigerant lines need to be bolted onto the outside unit. Be sure to read the instruction manual for the steps.

      Basically, the lines are hand started then tightened with the two crescent wrenches which are included in the kit.
    6. The outside unit will need to be wired for power and the wires from the indoor unit.
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 6
      It uses 115 volts on a 20 Amp breaker which go to the labels “L” and “N”.

      The inside unit has a wire clip that runs with the line-set that simply snaps together.

      Of course be sure to call a professional if needed.

    7. The last step is to let the refrigerant loose into the system with the Allan key.

      There are two valves that let the refrigerant loose on both the high and low-pressure lines.

      They will turn counter-clockwise and need several turns to fully open.

    8. After double checking everything is correct power can be turned on and the unit tested.
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Step 8
    9. Summary
      Installing the MRCOOL DIY Ductless Mini-Split is not hard for a handy person and a great way to save money.

      It is a great way to add heating and cooling to a garage, room addition, trailer or any place it is needed.

      Of course, if you have any doubts be sure to call a HVAC tech.

      I was able to install the unit within 4-5 hours but I have installed many mini-split units.

      It would be best to plan the install over 2 days along with a helper if possible.

      Testing the unit it is working very well both heating and cooling. I am sure it will work very well in the garage.

      It also has WiFi built-in which I haven’t tried out yet but plan to do so soon and will write a post on it when I do.

      I covered the line-set with a cover kit to clean it up and make it look good.
      How To Install MRCOOL DIY 12K BTU 17.5 SEER Ductless Mini-Split Heat Pump WiFi Line Set Cover
      While tape can be used to hold it all together line-set cover kits are low-cost items that make it look professional and what I use.

      Here is the line-set cover kit on Amazon I used
      Decorative PVC Line Cover Kit for Mini Split Air Conditioners and Heat Pumps

      I am still testing the unit so far with good results and will update if anything changes.

      As always be sure to read the reviews on Amazon, forums, or elsewhere to be sure a unit is a good fit for you.

      *This post contains affiliate links.
      Read More About The MRCOOL Mini Split Here on Amazon or eBay
      Available Here on Amazon

      Available Here on eBay



    Category: Mini split heating and cooling air conditioner heat pump systemsSours: https://www.hvachowto.com/how-to-install-mrcool-diy-12k-btu-17-5-seer-ductless-mini-split-heat-pump-wifi/
    Mini-Split, Ductless AC Unit, Electrical Wiring Codes

    Super, I liked it, she replied. Melissa's eyes widened when the instructor named the rental price. - But you yourself wrote that you want to accommodate a junior student, where did I get so much money from ?!. - I indicated that the price is negotiable.

    Mini wiring split cool mr

    Meanwhile, I straightened and tightened my skirt. The sister also sat down with her pants on over the bucket, she did not want to. Stumbling over the spaced sticks, we got out of the ill-fated place.


    I kissed her cheeks, face, lips and could not believe that I was lying with a real tranny, and I could squeeze and paw. And lick, and now we will undress and I will see and smell her dick and lick her ass. I was choking with excitement, she hugged me, I felt how strong and big she was.

    Now discussing:

    I could not believe my ears. - And then why are you on this holiday of sex. - My task is to break the barrier of a faithful wife and turn her into a lustful female.

    1267 1268 1269 1270 1271