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Question DetailsAsked on 7/27/2016

I have a 3 ton a/c 22, and I want to replace it with a 3.1/2 ton a/c R-410A .Do I have to replace the cooper tubing

I have a 3 ton a/c 22, and I want to replace it with a 3.1/2 ton a/c R-410A .Do I have to replace the cooper tubing

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3 Answers


My recent research says you*might* be able to use the old stuff,

once you get all the old oil out, but, since new line set is in the

$150-$200 range, you're probably better off going new.

At least then, if there's a problem in a year or two, contractor

will have to fix system, and not point to old lines and say

oh **there* is where problem is, told you to go new.


Answered 3 years ago by Riick


As other comment said - sometimes - depends on the thickness of the tubing and its pressure rating - you may be able to find copper "type" or ASTM rated pressure info on the outside of the tubing (in many cases). R-410a runs at substantially higher pressure than R-22 (Freon) so the thinner-wall tubing cannot safely handle it.

Definitely has to be well flushed out chemically, because the lubricating oil that flows through the system with the gas is different and can cause sludging and gelling up in the system, and potential serious compressor damage.

As other commenter said, if not running up through the walls so requiring a lot of effort and repair work to replace (as is common with mini-split units installed when house was built), I would go ahead and replace it, and in any case especially if showing any signs of corrosion or more than about 10-15 years old - why leave a potentially weak link in a new system, and as he said, why leave an old component that the installer or manufacturer can use as an excuse to not honor your warranty.

Answered 3 years ago by LCD


FYI, here is a link to a recent question with answer about the flushing of linesets issue -

Answered 3 years ago by LCD

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