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What Are Pre-charged Line Sets? - Ask the Expert Episode 264

Today is just a general question that we get a lot: “What are pre-charged line sets?”

Most normal refrigerant lines that you’re going to get for a heating and air system or a mini split are empty. They don’t have refrigerant in them. So, when we say pre-charged line set, we mean something specifically like the MrCool DIY lines or the no-vac quick-connect lines for the MrCool Universal. They all have refrigerant in them so that when you connect them, they already have the refrigerant and you don’t have to vacuum the lines or charge the system during the installation.

So, if you get something like an LG mini split, it’s not going to have pre-charged lines. That would be a conventional installation system. There are some mobile home units like Revolv that have pre-charged lines.

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Martin

Is it true, the state of New Jersey does not allow the installation of pre-charged lines by homeowners? Specifically referring to the Mr. Cool D-I-Y.

Michael Dowd

I love this Guy, he is very informative and very funny. Thanks

Martin S

Hi Dan, can I disconnect the Quick connect couplers from the indoor unit and re-connect a new line set? If I do, would the couplers be damaged? This unit is from Mr. Cool and the line set I received was the wrong size, it is too short so I need to install a longer line.

Sarah

Hi Dan, We ordered a Mr. Cool DIY and when we opened the box, one of the caps was off of the refrigerant lines. Is it unusable now? Do you think Home Depot will give us a refund? Thanks in advance! I really enjoy your videos!

wayne corbit

Can a Mr Cool DIY Condenserthat I have (DIY MULTI 3-27HP230) be paired with Olympus air handlers if you remove the DIY valves(on the condenser) and do a conventional vacuum and charge installation. . Will the air handlers communicate correctly with DIY condenser units? The DIY and Olympus looks the same condenser to me except for the DIY valves added to

RICHARD Pryor WHITENTON

I have a new 12,000 BTU mr cool mini split DIY unit and I have already attached the Freon lines. I have not released the Freon yet. can I disconnect and reinstall the lines so to recoil them? I have a 25 foot line and I only have 7 feet of space between the inside unit outside so I’m having trouble bending it to fit properly.

Dakota

If the unit comes precharged say to 98 ' does that mean it's 98' foot of pipe one way or is it as a set since it has a to and from line to the outdoor unit

Bob

I just installed a Pioneer DIY kit. It had a 25 foot precharge line, but I only needed 16 feet and left the rest coiled and mounted to the wall. The unit does not seem to be sufficiently cooling the house. Used the Vaccum kit they provide to vaccum the lines. How would I test if there is refrigerant in the lines?

Hamid

Hi can Precharged lines be disconnected and re connected without needing a recharge? if so what is the process? Thank you

Steve

Can you use a pre-charge line set and then use it on something like an LG or mitsubishi mini split if the set is the right size connections? This way you can get a higher end mini split without paying the thousands of extra dollars installers want.St

Doc

CT does not allow sales of any refrigerant to unlicensed persons. Nothing about installation...check both fed and state regs

Alex

I have MR COOL Universal Cooling Only condenser MDUCO1802436 and Universal High ESP Air Handler installed with 35' No Vac Quick Connect line set. Can I Replace condenser by MDUO182436 to convert whole system to heat pump? My steps: close all valves on air handler and condenser. disconnect No Vac Quick connect line set from condenser, replace condenser with new one, connect line set to condenser and open all valves, connect control wires accordingly. Does it will work? Thank you, Alex

Joseph hadlock

AC unit that's been sitting for 16 years but it's all pretty charged and the line sets are pretty charged My problem is I'm at the evaporator core and I have two female fittings is there something I should be putting between those like a filter or can I use a piece of pipe thread for a spacer thank you hey Dan in advance

Jason W

Hi Dan, I installed a Perfect Aire DIY dual zone system and mistakenly paired the smaller liquid tubes with the incorrect gas tubes on the outside unit, basically crossing them, attaching the smaller line for Unit 1 with the bigger line (port) for Unit 2 and vice versa and then opened the allen screws to let the r410a refrigerant free before realizing my mistake. I shut the allen screws for the two smaller liquid lines and attempted to disconnect the first one in order to make the swap and of course the Freon started coming out. Is there a way to do this without losing all the refrigerant or do I have to pump down the whole system into a recovery tank, swap the lines and then pump the refrigerant back in ? I know the warranty may be voided, just trying to see if I can do this without losing much of the refrigerant and then worse case scenario having some added back in, or is it all going to come out? Buying the manifold, pump , recovery unit and tank isn’t a cheap fix so just wondering if I’m unaware of a quicker, easier more affordable one. Any info is greatly appreciated ?

Loren

Where is the Freon kept in the mr cool 24 k? Not in the lines initially, right ? It needs to be released into the lines after they are installed from a compartment in the outside part, correct?