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  1. #1
    Join Date
    Apr 2012
    Posts
    6

    Can you convert this air handler to R410a?

    Can you change coils in this unit to take R410a?

    Rheem Classic
    Model: RHSA-HM4221JA
    built: 12-2007
    volts 208/240
    single phase

    Thanks

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,462
    Would have to braze in a new TXV.

  3. #3
    Join Date
    Apr 2012
    Posts
    6
    So you are saying it can be done? Is the cost very high to do this?
    Thanks

    I have a bad HP that is R-22 and the air handler is r22. HVAC guy is checking to see if the AH could convert to R410a then install r410a HP.
    Thanks for the help

  4. #4
    Join Date
    May 2004
    Location
    Frederick, MD
    Posts
    1,035

    Might

    want to look into a dry-charged R-22 unit.
    GO NAVY, BEAT ARMY!

    A DECADE OF DOMINANCE! +2

  5. #5
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Trying to convert the evap coil is not recommended. None on the lcoal contractors I've talked with will do it. Too hard to flush out all the incompatible oil from so many copper tubes.

    The FYI there are 2 issues with coverting from R22 to R410a. 1) Pressure. 410 runs at a higher pressure so the coil would need to be rated for both. Many made after the mid 90's are. 2) oil - the oils used to lubricate the compressors that mixed with the refrigerant is icompatible and will contminate the special oil the R410a uses. If you don't flush it all out, the compressor won't live very long.

    Go with a Dry fill. You should get 8-10 years without needing to add a significant amount of refrigerant if it's installed correctly. That's long enouhg where you'll be looking for a complete systme replaecment at that time.

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