Page 2 of 2 FirstFirst 12
Results 14 to 16 of 16
  1. #14
    Join Date
    Apr 2004
    Post Likes
    Re using the old line set typically doesn’t hurt anything as long as the pipe diameters are correct.

    Line sets have not changed since the introduction of 410-A.

    Of course the right approach is to change the line set but sometimes it is just not practical. If the line set is flushed, the appropriate size and pressure tested I don’t see the problem.

    Mineral oil uses Chlorine to attatch itself to the refrigerant (410-A does not). The Cholrine provides the attraction for Mineral oil to return back to the compressor.

    Since there is no Chlorine in 410-A there is nothing for the oil to adhere to. The oil (mineral) tends to get pumped into the evaporator and coats the inside of the coil, thus providing bad transfer.

    Mixing oils doesn’t hurt the machine but creates capacity loss due to bad heat transfer.

    Typically you can mix up to about 5% of oil before exhibiting any issues.

    So if you replace the indoor coil, the lines have no traps (or storage of oil) and flush the lines I cant see how you would contaminate the oil enough to experience capacity loss.

    Just my two cents…
    Live each day like it is your last, for one day you will be right!

  2. #15
    Join Date
    Aug 2002
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Post Likes
    hvac r us2 ,is correct ,we have installed a lot of Puron/R410a changeouts,if they are sized correctly,flush them ,it will work just fine.

  3. #16
    Join Date
    Mar 2002
    Richmond, Virginia
    Post Likes
    Most manufacturers, Lennox I'm sure of, has specific guidelines in the installation instructions outlining the proper procedure for flushing existing lines for reuse with R410a equipment.
    There is nothing more frightful than ignorance in action....Mark Twain

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.