Results 1 to 12 of 12
  1. #1
    Join Date
    Jan 2012
    Posts
    1
    Post Likes

    Topped up 407C with 404A

    Topped up a 404A system with approx 3lbs of 404A. What I didn't know that the system was changed to 407C at some point.

    Total gas inside around 110lbs. Don't think it's a big deal as they are both blend gasses and use the same oil. What do you guys think. Everything working well atm.

  2. #2
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    6,461
    Post Likes
    As you say , its a blend , with similar properties , so personally , I would do as the Italians often do

    fughedabaudit

  3. #3
    Join Date
    Apr 2003
    Location
    Maple Grove, MN
    Posts
    3,153
    Post Likes
    As long as it was an accident and you are truly sorry, I think we can let it slide this one time. Just don't ever do it again.

    By the way, welcome to HVAC-TALK! Your user name implies that you are a student and a guy. Is this correct?

    If at First You Don't Succeed, Skydiving Is Not for You.

  4. #4
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,412
    Post Likes
    Quote Originally Posted by ammoniadog View Post
    As long as it was an accident and you are truly sorry, I think we can let it slide this one time. Just don't ever do it again.

    By the way, welcome to HVAC-TALK! Your user name implies that you are a student and a guy. Is this correct?

    Can we ask that question today?

  5. #5
    Join Date
    May 2017
    Location
    richmond virginia
    Posts
    44
    Post Likes
    Quote Originally Posted by StudentGUY View Post
    Topped up a 404A system with approx 3lbs of 404A. What I didn't know that the system was changed to 407C at some point.

    Total gas inside around 110lbs. Don't think it's a big deal as they are both blend gasses and use the same oil. What do you guys think. Everything working well atm.

    I did this on 2 seperate occasions and both are still going strong to this day. Although i did put 22 in a 404 system and later went back and swapped out the guts and head to the tev. Thats another story though. Lots of stores round here that its a guessing game whats inside since theyve got mismatched equipment not labeled

  6. #6
    Join Date
    Mar 2018
    Posts
    38
    Post Likes
    Quote Originally Posted by ammoniadog View Post
    As long as it was an accident and you are truly sorry, I think we can let it slide this one time. Just don't ever do it again.

    By the way, welcome to HVAC-TALK! Your user name implies that you are a student and a guy. Is this correct?

    Since they joined 7 years ago I doubt they are still a student.

    This summer I found out my niece is now a nephew, so who knows on that part of the name. Not that there's anything wrong with that.

  7. #7
    Join Date
    May 2009
    Location
    Earth
    Posts
    6,337
    Post Likes
    Not quite sure why they use the same tank color with 2 popular gases? You would think they could start using white and purple again?

  8. #8
    Join Date
    Apr 2003
    Location
    Maple Grove, MN
    Posts
    3,153
    Post Likes
    Roomer has it that they will be giving up on the colors soon. Then they'll all be grey, no matter what flavor is inside.

    In my perfect dream world they would keep R404a and ban everything else. Low, medium, high temperature, it don't matter, it seems to get the job done.

    Oh well, back to reality.

  9. #9
    Join Date
    Aug 2013
    Location
    Templeton MA
    Posts
    45
    Post Likes
    We mostly use 100 pounders where I work. Our 134A and 404A both come in gray. It’s ok, but you need to walk up to the tank to tell what it is.


    Sent from my iPhone using Tapatalk

  10. #10
    Join Date
    May 2003
    Location
    Utah
    Posts
    909
    Post Likes
    No doubt the system will operate satisfactorily. But, there are 2 problems with making your own custom blend:

    1) You’ve just broken the law by making a blend that hasn’t been sanctioned by the EPA.

    2) You now have no idea what the pressure temperature relationship of the new blend is....how will you accurately set the superheat (and subcooling, if needed)?

  11. #11
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,412
    Post Likes
    Clearly Label the unit!
    Attached Images Attached Images  

  12. #12
    Join Date
    Nov 2011
    Location
    East Side
    Posts
    6,704
    Post Likes
    years ago, my BRoinlaw was working on a large process chiller....held like 3,000 lbs. it was late, and dark, had the forktruck guy bring him a 500lb cylinder. he said it took him about 10-15 minutes of dumping gas in to realize the cylinder was green instead of blue! said it ran fine for years after. funny thing was he never talked about it until after the machine was replaced!LOL!!

    you guys remember that string from a few years back where the guy came on here saying it was standard practice for him to top off R22 systems with 407? that was a funny one!! might have got lost in the crash.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •