Do Line Sets Have To Be Charged On A Mini Split? - Ask the Expert Episode 197

Today's question comes from Ron. "Hey Dan, do you have to charge the line sets on a 12k ductless mini split before turning it on?"

Yes, the line sets should always be charged on a mini split before you turn it on. I think what he's asking about, however is the MrCool DIY unit. If you have a MrCool DIY, you don't have to charge the line set. The line sets on the 12k DIY are going to come pre-charged. You don't have to do anything, you just connect them and you're good.

Now, for any other mini split that is a 12K, they are not going to come pre-charged. So, those will have to be vacuumed and charged correctly. Technically, all line sets will have to be charged, whether that happens in the factory for the MrCool DIY or it happens during installation with a Mitsubishi, LG, or any other brand.

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

4 comments (view/add)
  • Micky
    Posted on 2/16/2020

    Hi, is a Senville 12k mini split come precharged? and do you recommand this unit. If not what is a good alternative?

  • Steven
    Steven from Ingrams
    Posted on 2/17/2020

    I'm not sure if the Senville systems come pre-charged or not. We do not carry that particular brand. The MrCool DIY 12k is a good choice. It comes pre-charged and is setup for a do it yourself installation. You can find it here:

  • Leo Rosenlund
    Leo Rosenlund
    Posted on 2/24/2020

    Are these ductless units good in sub zero temps?

  • Kyle
    Kyle from Ingrams
    Posted on 2/26/2020

    Most ductless mini-splits are not designed to operate in sub-zero temperatures. However, there are some systems like the MrCool or Mitsubishi Hyper Heat units that can perform adequately below zero. Their low operating temperature is -20 degrees. We aren't aware of any mini-splits that would work below that temperature.

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