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  1. #14
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,735
    Its only been 2-3 months but so far so good, all have kept up fine so far. Hasn't got above 90 for any extended length of time yet. We've done 4 changeovers and all were oversized anyway so it will probably help if there is some capacity loss.

  2. #15
    Join Date
    Jun 2011
    Location
    Hammond,La.
    Posts
    1,176
    Quote Originally Posted by toocoolforschool View Post
    Capacity loss and need to change oil to poe, and change o rings and possibly txv. I would do a serious pressure test and stick with 22.
    Actually on the oil change part some are only requiring adding 10-20% of POE oil to the mineral oil to enable migration. That is what they are claiming anyway. Though it would probably be best to change it out completely if doing a retrofit refrigerant.
    "I am for doing good to the poor, but I differ in opinion of the means. I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it."
    Benjamin Franklin, 1766

  3. #16
    Join Date
    Jun 2011
    Location
    Hammond,La.
    Posts
    1,176
    Just for some short term experience, I had a customer with two old units that were almost dead flat like his wallet. I decided to go with 407c and added aprox 20% POE oil to the mineral oil and charged as usual. No foaming, seems to have good migration, cooled amazingly well with a 19* split and pressures were exactly what I would expect from R22.
    "I am for doing good to the poor, but I differ in opinion of the means. I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it."
    Benjamin Franklin, 1766

  4. #17
    Join Date
    Mar 2012
    Location
    Alabama
    Posts
    8
    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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    Additional infractions may result in loss of posting privileges.
    Last edited by jpsmith1cm; 07-11-2013 at 06:11 AM.

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