Is There a Minimum Required Length for a Line Set? - Ask the Expert Episode 201

Today's question comes from Abe. "Hey Dan, is there a minimum required length for a line set? I only need seven feet. I wasn't sure if you needed a certain amount of coolant between the units?"

So, he's talking about the copper line set that you would find between a central heating and air condenser, which is the outside part of the system, and an interior air handler. He could also be talking about a ductless mini split with a similar setup, the condenser outside and the air handler inside. Between those, you have two refrigerant lines called the line set.

The answer to your question is yes. Sort of.

So, the condenser is going to be charged most of the time for a certain amount. The manufacturer may think, well, most people are going to have about twenty feet of line between the condenser and the air handler. So, they will charge the unit for that amount. Which means technically there is a minimum required length for a line set, however, if you need less than what they charged it for, you might have to take some out.

But that's not a big deal. Any good technician can take out refrigerant or add it. That's not uncommon when you're installing a split system. You might have to add a little refrigerant, you might have to take some out.

As far as a truly minimum length, I mean, not really. For instance if you've got a package unit, and the condenser coil and your evaporator coil are right next to each other, so it's not like you have to have like ten feet or something for it to work. The minimum required length for a line set just depends on your unit.

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

2 comments (view/add)
  • Kurt Nienhusser
    Kurt Nienhusser
    Posted on 2/25/2020

    Hi Dan,
    Can you pealse point out the pros and the cons of installing a MINI SPLIT system in the crawl space?
    Thanks and I hope to hear from you soon!

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

    By 'in the crawl space' do you mean putting the condenser in the crawl space?

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