How to Install the MrCool DIY Multi-Zone Mini Split

When you install the MrCool DIY Multi-Zone mini split, you can heat and cool up to four spaces in your home or workplace, all with one condenser. And, as the name suggests, you can do it yourself!

First you will need to know what size unit you need for each room you plan to heat and cool. The MrCool DIY Multi-Zone mini split can have anywhere from 9,000 BTU air handlers all the way to 24,000 BTUs.

You will need to make sure you are pairing the correct condenser with the number of air handlers and sizes, as there are multiple configurations depending on your needs.

With each air handler you will find a wall template, which helps you line up the mounting plate for the air handler. The mounting plate is connected to the back of the air handler. Just remove the screw and pull it off.

Once removed, use the template, a level, and provided screws to place the wall mount.

You will need a 3.5 inch hole saw for the communication wire and line set for each air handler.

Now, feed the communication wire through the holes you’ve drilled, along with the line set connected to the air handler. Then, mount the air handlers.

Then, connect the provided insulated line sets together.

Screw the fittings together by hand, then use two fixed wrenches to makes sure the line set is secure.

Extra line sets are available for purchase if the default line set length is not long enough for your set up. With additional line sets, you get a coupler kit for connecting the line sets together. Connect these the same way you connected the line set near the air handler.

Once all the air handlers are mounted and connected, it’s time to connect the line set to outdoor condenser.

For those using the larger 24,000 BTU air handler, you will have to replace the connected couplings on the condenser to adequately connect the line set to port A. As before, connect the line set connections with your hand, then use two fixed wrenches to secure them tightly. Once that is finished with each of your air handlers, use an Allen wrench to open the valves.

If you are not familiar with wiring this type of unit, it may be important to consult an electrician.

Be sure to spray soapy water on all the line set connections to check for leaks.

Once all is connected, the MrCool DIY Multi-Zone mini split is ready to go. You can also add additional accessories such as the MrCool Mini Stat, or you can connect the MrCool Multi-Zone DIY mini split to your Amazon Alexa or Google Assistant for each of the rooms you’re heating and cooling.

The MrCool DIY Multi-Zone mini split is the perfect way to heat and cool multiple rooms with ease and efficiency.

Disclaimer: Installation of any MRCOOL HVAC product must comply with all applicable codes and regulations. The service of a certified and trained electrical technician may be required for the installation process.

2 comments (view/add)
  • Cori Leech
    Cori Leech
    Posted on 7/22/2020

    We installed the system and it’s working, but a little too well, when set to cool with fan on auto and a specific temp it doesn’t seem to slow down or stop cooling when it reaches temp. The room temp will read “63” and the unit will be set to “74” and the unit will continue to be blowing cold air.

  • Kyle
    Kyle from Ingrams
    Posted on 7/23/2020

    Maybe a problem with a temperature sensor. Give us a call at 270-575-9595 x300 to speak with tech.


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