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  1. #14
    Join Date
    Oct 2016
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    I’ve heard it works fine. Agin the rules...but will work.

  2. #15
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
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    Quote Originally Posted by Scoobie View Post
    I’ve heard it works fine. Agin the rules...but will work.
    It might WORK fine but then someone comes along and recovers that mess and get hit with a disposal fee because some a$$ wipe mixed refrigerants!

  3. Likes CEAS-AC-TECH liked this post.
  4. #16
    Join Date
    May 2003
    Location
    Utah
    Posts
    919
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    Not only is it illegal, once you make your own personal blend...you now have no idea what the pressure-temperature relationship is.

    Which means, if your one of those technicians that is actually concerned about subcooling and superheat, it will be impossible to measure it.

  5. Likes CEAS-AC-TECH liked this post.
  6. #17
    Join Date
    Nov 2014
    Location
    Chicago Illinois
    Posts
    216
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    ive found this summer that fluctuating pressures happen when combining the two together. When recovering then replacing its fine but a vacuum (full) is usually required to actually make it work the way its supposed too.

    We always recover then replace. saves problems it seems.
    ---------------
    Steve
    Faith Heating & Cooling Chicago

  7. #18
    Join Date
    Oct 2014
    Location
    Saint Pail, Minnesota
    Posts
    736
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    Mixing is lazy, just like bypassing certain components.

  8. #19
    Join Date
    Sep 2016
    Posts
    75
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    Pepe be careful, R407 is not miscible with mineral oil, therefore, if you have it ... no more lubrication after R22 disappears

  9. #20
    Join Date
    Jul 2011
    Location
    DFW, TX.
    Posts
    1,481
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    Rs44b...

    Sent from my LG-G710 using Tapatalk

  10. #21
    Join Date
    May 2017
    Location
    richmond virginia
    Posts
    47
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    Quote Originally Posted by Pepe The Frog View Post
    One of the fellas at the parts house was trying to convince me that 407C on top of R-22 was a good idea. We've been recovering all the 22, making necessary repairs and then replacing with 407. Has anyone heard of people putting 407 on top of 22? ...on that note I was getting some odd fluctuating pressure readings on a unit but the line temps remained the close to the same. Oh, and the system was cooling.... Anyone have any thoughts?
    I have definitely seen it done in the past but just like stated before it's illegal and although it will work it causes too many problems. If you watch your gauges after it's been added you will see a crazy fluctuation almost like a TXV hunting but way more erratic. It just simply should not be done

  11. #22
    Join Date
    May 2018
    Location
    FLORIDA
    Posts
    289
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    Remove the 22
    do a new charge with 407 and put a sticker on the side of condenser saying R407C
    Visit our website at www.airconcomfortcooling.com

  12. #23
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,288
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    Quote Originally Posted by AIRCON8 View Post
    Remove the 22
    do a new charge with 407 and put a sticker on the side of condenser saying R407C
    Might want to put some POE oil in there...….at the least SUPCO 88!

  13. #24
    Join Date
    Oct 2019
    Location
    North Texas
    Posts
    46
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    Thread Starter
    Quote Originally Posted by AIRCON8 View Post
    Remove the 22
    do a new charge with 407 and put a sticker on the side of condenser saying R407C
    Yep. Of course. That's what me and my guys have been doing. I have since talked to the branch manager about the "information" his counter help is giving out...

  14. #25
    Join Date
    Oct 2007
    Location
    Broward County, FL.
    Posts
    663
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    The counter guy was most likely repeating what he heard from some of the guys buying 407C, in his mind he may have thought that he was passing on useful info to other customers.

    We as contractors or techs need to filter out erroneous technical info we are given be it from a counterman, manufacturer, fellow tech or even boss. I would not have taken offense at the counterman being misinformed, I would have been more irked if he tried to convince me to use a leak sealer.

    I may have told him to be careful because what he was recommending was against the law and left it at that.
    I miss you mom and dad.

  15. #26
    Join Date
    May 2018
    Location
    FLORIDA
    Posts
    289
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    Quote Originally Posted by SkullMonkey View Post
    The counter guy was most likely repeating what he heard from some of the guys buying 407C, in his mind he may have thought that he was passing on useful info to other customers.

    We as contractors or techs need to filter out erroneous technical info we are given be it from a counterman, manufacturer, fellow tech or even boss. I would not have taken offense at the counterman being misinformed, I would have been more irked if he tried to convince me to use a leak sealer.

    I may have told him to be careful because what he was recommending was against the law and left it at that.
    The counter guy at Goodman today told me he don't know what NATE is. At the beginning i tough he was joking, then a couple of other guys join the conversation, he was not joking...Welcome to Florida. LOL
    Visit our website at www.airconcomfortcooling.com

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