Question about Converting R22 to R32

[exmaxima1]

My Lennox Elite 13 is now 26 years old and probably living on borrowed time. I'm looking into upgrading from the R22 system to a newer R32 refrigerant. Many installers are quoting installation using my existing R22 copper lines. They claim it is normal to flush and reuse the lines.

Is there anything wrong with using the old lines?

 

[Firebrick43]

Depends where and how they are ran. The old ones could be significantly corroded where it passes thru concrete or touching organic mater/certain chemicals are allowed to touch it and could cause pin hole leaks.

Or it could be perfectly fine.

If you do replace them insist on a good line set with black rubber foam insulation like mueller. There has been enough evidence that the cheaper poly foam (white) is breaking down quickly and causing pin hole leaks.

 

[bob smith1]

It is normal, but lineset should be visually inspected as much as possible. Let your pocket decide on a new line set if it looks good. I have no issue with it. BUT, demand that the lines be 'pigged' or swabbed to remove any residue or oils. It's a great time to clean them up, NOT just blow some N through and call it good.

 

[exmaxima1]

One more issue. My system is 3-ton and it honestly does the job though it runs quite a bit at times. The online calculators say I need 5 tons for my 3000ft2 2-story house. Would the same lines handle a 5-ton unit?

 

[bob smith1]

One more issue. My system is 3-ton and it honestly does the job though it runs quite a bit at times. The online calculators say I need 5 tons for my 3000ft2 2-story house. Would the same lines handle a 5-ton unit?

You need to lean on your installer more than some online calc. It is NORMAL and PREFERRED that a system run nearly non-stop in the heat. Sounds like 3T is sized right and 5T is an insane jump!

 

[exmaxima1]

Thanks!