What to do With Leaking Line Sets on the MrCool DIY? - Ask the Expert Episode 249

This question is from Forest.

“Hey Dan, I believe my lines leaked. Is it possible to buy another pre-charged line set and hook it back up and it will work fine?”

So, he was asking this about the MrCool DIY ductless mini split heat pump. So, he’s got pre-charged lines and he says they leaked.

Can you get new ones? The answer is maybe. If only the lines leaked, like they were damaged in shipping or something, then sure, you can just get another set of lines and put them on there.

If they leaked while they were connected to the unit and it was running, you might have lost more charge than what was just in the lines. In that case you need to have somebody come out and check the charge on the unit to see if it was at the right level or not.

If it is, then just get new lines and connect them. If it’s not, you would then have to have the unit charged up to what was appropriate.

Got more questions? Just ask in the comments below.

8 comments (view/add)
  • James Deorio
    James Deorio
    Posted on 2/17/2021

    Dan, sorry I'm getting back to you so late. I want to comment on your response to my original comment (that's a mouthful!). You state that the line sets on a MRCOOL DIY are pre-charged. I'm trying to understand how that could be when the line set is open when it's attached to both the inside unit and to the condenser outside. Only after the lines are attached at both ends are the lines at the condenser opened to allow the refrigerant to flow. At least that's the way I understand it. Help me to see where I'm mistaken. As always, thanks for your time.

  • Dan Danowski
    Dan Danowski from Ingrams
    Posted on 2/17/2021

    Standard refrigerant line sets are open on each end, and function as you describe. MRCOOL DIY pre-charged lines are not open. They are sealed lines with valves that open only after they are properly connected to the condenser or air handler. The DIY lines are very different from normal mini-split lines.

  • Ed Crenshaw
    Ed Crenshaw
    Posted on 2/16/2021

    What is the primary reason a 5 ton Universal heat pump in heat mode will run just a short period of time then stop and throw a P5 code .. the air handler fan is running fine and the thermostat evidently is working fine, this is a new unit( Aug 2021)
    Thanks

  • Dan Danowski
    Dan Danowski from Ingrams
    Posted on 2/17/2021

    A P5 error code is over-current protection. Give us a call at 270-575-9595 x300 to speak with tech support.

  • James Deorio
    James Deorio
    Posted on 2/9/2021

    I have two of these DIY systems. Are you sure it's the lines that are pre-charged? I thought the refrigerant was in the condenser. The lines are not sealed, how can they hold a charge? Thanks for your time.

  • Dan Danowski
    Dan Danowski from Ingrams
    Posted on 2/10/2021

    The DIY lines are pre-charged. If you have a mini-split w/unsealed lines, you either do not have a MRCOOL DIY or you have the wrong line sets for the system.

  • Robert Baker
    Robert Baker
    Posted on 2/9/2021

    How much freon does a 18000btu mini split ac unit hold

  • Dan Danowski
    Dan Danowski from Ingrams
    Posted on 2/10/2021

    The factory charge for any specific unit is printed on the condenser data plate in ounces. The specification I have is 68.8 oz.


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