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  1. #1

    Using old tubing with new 410a equipment

    What are the results of using old tubing from an R-22 system that is being converted to 410A? I have been able to use new tubing until now, where it is very impractical. Supposedly you can flush the existing tubing to remove the mineral oil. What have been the results in the real world?

  2. #2
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,502
    unless theres somehow an excessive amount of oil in the lines, you don't need to do anything different than you would if swapping out R-22 equipment. mixing the oils doesn't create some sort of super sludge like the flush companies want you to believe.

  3. #3
    Join Date
    Sep 2012
    Location
    Harrisburg, PA
    Posts
    12
    Make sure you confirm the size of the line set!!! also make sure you use the flush.

  4. #4
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    I worry more about the flushing agent than I do the oil so I dont flush unless its a burn out.

  5. #5
    Experience counts. You guys feel like this is a concensus everywhere? If your experience and that of your peers tells you that there are more imprtant things to worry about, then I won't get too concerned about it. They said a lot of things about 410A in the beginning. I like this one: Do not charge vapor. Do not top off. Then they report that testing has shown that a leaking system can be topped off something like 35 times with no noticeable effect. Love the internet.

  6. #6
    Join Date
    May 2011
    Location
    Pennsylvania, USA
    Posts
    4
    Just verify the line sizes are correct for the new equiptment. Do a tripple evacuation.

  7. #7
    Join Date
    Aug 2012
    Posts
    2,686
    Don't forget to change FD.

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,377
    Make sure line set size is ok. Then blow it out with nitro.

    Its still best to only charge r410a as liquid only.

    The false rumor you heard about not topping off was from sourves that either didn,t have any training on it, or were just prejuctice against it.

  9. #9
    Join Date
    Nov 2011
    Location
    Phoenix,AZ
    Posts
    325
    nearly all the linesets here are behind drywall so replacing them is not an option not to mention most people wont pay extra for them to be replaced.

  10. #10
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,561
    I just blow with nitro and pull a good vac with a micron gauge. When we first started installing 410 we used the flush but I feel like it will do more harm than a little oil. That flush is some potent stuff, smells like nail polish remover and burns your eyes. Trane install manual says to NOT use ac flush

  11. #11
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    how would trane know.... lol
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  12. #12
    Join Date
    Feb 2007
    Location
    joliet il.
    Posts
    5
    I would make sure there are no soft solder joints in it first!Back in the day , alot of installers used 50/50 or 95/5 on there joints! 410a pressures may cause a failure at this type of joint! Nitro flush is is a minimum prep.

  13. #13
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,502
    Quote Originally Posted by Mark s View Post
    I would make sure there are no soft solder joints in it first!Back in the day , alot of installers used 50/50 or 95/5 on there joints! 410a pressures may cause a failure at this type of joint! Nitro flush is is a minimum prep.
    A 3/8 line with 400 psi inside is experiencing about 17 pounds of force pushing the connection apart. Bubble gum would almost be capable of holding that together.

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