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  1. #40
    Join Date
    Mar 2013
    Location
    Port St. Lucie, Fl
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    6,649
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    Leading

  2. #41
    Join Date
    Jan 2010
    Location
    Sea to Sky
    Posts
    2,454
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    Napping

  3. Likes shellkamp liked this post
  4. #42
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    18,122
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    Waiting
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

  5. #43
    Join Date
    Nov 2008
    Location
    Altamont, IL
    Posts
    550
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    My first jug of MO 99 sat around a long time it's box said "Dupont Isceon MO 99. Now its Dupont Freon MO99 ??????????????????
    In GOD We Trust

  6. #44
    Join Date
    May 2014
    Location
    Bay Area California
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    18,122
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    Quote Originally Posted by jdwendling View Post
    My first jug of MO 99 sat around a long time it's box said "Dupont Isceon MO 99. Now its Dupont Freon MO99 ??????????????????
    Probably shouldn't use it.

    /s
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

  7. #45
    Join Date
    Oct 2014
    Posts
    77
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    Quote Originally Posted by VTP99 View Post
    Correct me if I'm wrong but doesn't DuPont (Chemours) hold the patient on R1234yf and has entered into a anti-competitive arrangement with Honeywell ?
    Correct me again but wasn't it after there original refrigerant patients ran out that all these new blends arrived ?
    Seems to be making a complete circle once again.
    Here's an old thread http://hvac-talk.com/vbb/showthread....uth&styleid=41
    I remember this guy's web site; it's gone, now.
    For the record, I don't agree with him but there might be a kernel of truth to what he says, too.

  8. #46
    Join Date
    Dec 2009
    Location
    maroon lazyboy
    Posts
    2,112
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    Just helped convert an older R22 rack to 448a. Same tev powerheads.

  9. #47
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
    Posts
    13,462
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    Quote Originally Posted by jdwendling View Post
    My first jug of MO 99 sat around a long time it's box said "Dupont Isceon MO 99. Now its Dupont Freon MO99 ??????????????????
    Quote Originally Posted by BBeerme View Post
    Probably shouldn't use it.

    /s
    DuPont changed its name to Chemours back in 2015. Then they brought back the old Freon brand name and applied it to all of their refrigerants that were formerly Suva and Iceon.

    https://www.chemours.com/Refrigerant...nformation.pdf

  10. #48
    Join Date
    Mar 2007
    Location
    In the Conservatory with a Lead Pipe
    Posts
    14,992
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    Hey Sporlan you still there?
    Can you do some compairison testing using dew point to set up superheat vs using the average temp between bubble and dew?

  11. Likes VanMan812 liked this post
  12. #49
    Join Date
    Oct 2012
    Location
    Where we mow our own grass
    Posts
    6,631
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    Quote Originally Posted by itsiceman View Post
    Hey Sporlan you still there?
    Can you do some compairison testing using dew point to set up superheat vs using the average temp between bubble and dew?
    I’ve had better luck using the average.

    We have two major chains we do work for that specifically want superheat set using the average between bubble and dew.

  13. #50
    Join Date
    Mar 2007
    Location
    In the Conservatory with a Lead Pipe
    Posts
    14,992
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    Yeah but they get all day to mess with it and make some cool charts for us

  14. #51
    Join Date
    Feb 2007
    Location
    Fremont, Indiana
    Posts
    3,273
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    404..... $140/24lb
    449..... $312/25lb

    Think I'll stick with 404 for now, but can either 449/448 be used to retro high temp r22 systems?

    Sent from my SM-N950U using Tapatalk
    Member of the "Work Exchange Program"
    "Will work for knowledge"

    "Everyone is a genius. But if you judge a fish on its ability to climb a tree, it will live its whole life believing that it is stupid"
    A Einstein

  15. #52
    Join Date
    Jul 2018
    Posts
    1
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    Our retrofit team came ove and did a “hussmann plus” rack in a supermarket in my service area. They replaced every component in the system that may have any rubber parts and re inaulated the rack. The rack is medium temp, held 1400 lbs. of gas and designed for 115 degree condensing. Rack was converted from r22. All this was done just last month. So my concerne is; the rack now runs at 335 psi discharge. 178f in and 113f out of the condencer on a 105 ambient day. Should we be concerned that this rack was designed for 400 psi high side and we are now running close to that for about 6 hours each day.

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