Can I Install the Air Handlers at Different Times for Multi-Zone Mini Splits? - Ask the Expert Episode 213

"Hey Dan, for multi-zone mini splits, like the dual-zone system, do you need to install both zones at the same time or can you install it and use one zone, then install the second zone a few weeks later?"

Yes. You can do that for some multi-zone mini splits. You will want to check with the specific model because some of them you can do that with. For instance, the MrCool Multi-Zone 36K BTU you can start with a 9k air handler, then add a 12k air handler, then another 9k air handler, etc.

There will be a specific order, though. You wouldn't be able to just add whatever air handlers you want, but yes, you can start with one zone and install the rest later on multi-zone mini splits.

Multi-Zone mini splits do allow for installing and using only a portion of the air handlers they are built for. For a more thorough answer to your specific setup, you can always give us a call and our team of experts can help you.

Have more questions? Just ask them in the comments below or on Facebook or on Twitter.

4 comments (view/add)
  • MS
    Posted on 5/19/2020

    I have two 4-zone MrCool DIYs on order and will want to phase in the installation. What constraints will there be for the order in which we install wall units?

    One is supplying 4 9k units all on the same level.
    The other is supplying 3 9k units on one floor and 1 12k two floors below.

  • Kyle
    Kyle from Ingrams
    Posted on 5/20/2020

    There really is no specific order for installation, other than the largest indoor units should be connected to the condenser beginning with the A port. Since the one system is all 9K units the order will not matter. The installer must be sure to wire the A air handler to the A terminal block and the refrigerant lines must be connected to the A valves.

  • Anderson Clark
    Anderson Clark
    Posted on 5/27/2020

    I'm waiting for arrival of DIY/Gen3 multi-zone, 27k condenser (3 air handlers:9,9,12) in package HA 21036. I need one 9k a.s.a.p. If I reserve Port A for the 12k linseed, can I use Port B for a 9k AH immediately and run other two line sets a bit later?. . . . I am going to need to knock holes thru brick for 3 line sets. Alternatively, I can run all 3 linsets through one large brick opening into basement and continue line sets at joist level and up through floors to each indoor unit. Theoretically, is that a problem?

  • Kyle
    Kyle from Ingrams
    Posted on 5/28/2020

    Hopefully we will have the new DIY Multi-Zone in stock by the first week of June.

    Yes, you can reserve port A for the 12k air handler later and the other ports can be used for the other units. However, you must have a minimum of 50% of the condenser capacity hooked up to the condenser at start up to prevent damage to the compressor. For a 27K that would be 14k BTUs. Having the line sets come up thru a wall is theoretically possible, but there could be issues. First, is how to handle condensation drainage inside the wall. Next would be managing bends in the refrigeration lines inside of a wall. It is not impossible and can be done, but would be quite difficult.

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