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  1. #1
    Join Date
    Jul 2011
    Location
    Ontario, Canada
    Posts
    26

    404A elementt on a 22 coil

    Was working on a freezer the other day and repaired a leak on a tx valve, r 22 rack. noticed that someone was playing with valve and it was flooding back to rack so i adjusted to 10F superheat at coil.

    someone then pointed out afterwards the element on the valve was for 404 system. seeing as I had the valve adjusted to proper superheat does it really matter that it is the wrong element? all the tx valve does is control flow into evaporator so if i had flow right then why does it matter?

  2. #2
    Join Date
    Sep 2002
    Posts
    2,887
    I can't wait for the replys on this one,as for me I am in enough trouble!

  3. #3
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,564
    The valve will work fine........ at the exact conditions (evap temp, suction pressure) you set it at. Any other conditions, the opperation will not be correct.

  4. #4
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,071
    I would worrie about flooding in low load conditions. The R404 element will have a greater opening force than a R22 element.

  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,926
    Quote Originally Posted by Phase Loss View Post
    I would worrie about flooding in low load conditions. The R404 element will have a greater opening force than a R22 element.


    Also, if the valve is designed for 404a, it will tend to have a larger orifice.

    I've seen one or two small 404a valves flood out an r-22 rack in a half hour.

  6. #6
    Join Date
    Jan 2010
    Posts
    6,785
    Now who went and put a R404a power element on a R22 system ?

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,926
    Quote Originally Posted by VTP99 View Post
    Now who went and put a R404a power element on a R22 system ?
    Maybe someone put 22 in a 404a system...


  8. #8
    Join Date
    Sep 2002
    Posts
    2,887
    Maybe someone forgot to put in the valve ,started it up and running for weeks! I had an SC on It! The readings were wacko!

  9. #9
    Join Date
    Jul 2011
    Location
    Ontario, Canada
    Posts
    26
    lol no it is a low temp r22 rack. freezer has had that head on tx valve for a long time i think. freezer has been running a little warm. other guy that looked at it thinks its the head on the tx. i dont really agree. if the coil is being feed properly then that is important part. i think the problem is the ****ty old rack. have 5 compressors on the rack all running, setpoint is 10psig on controller and its running 12-15psig. never reaches 10.

  10. #10
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,926
    Quote Originally Posted by Magoo83 View Post
    its running 12-15psig. never reaches 10.
    Well, THERE'S your problem.

    Find out WHY! Fix it.

    You'll be the hero (after they're done b***hing about the bill)

  11. #11
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,926
    Quote Originally Posted by Magoo83 View Post
    i think the problem is the ****ty old rack.
    Thinking like that will never resolve the problem.

    Yes, it may be old. Yes, it may have been poorly maintained and sub-standard repairs have been done to it, but there it sits and it needs to run.

    Your job, however, isn't to condemn the last guy (or guys) or the last company or companies that serviced it.

    Your job is to find the ROOT of the problem. Repair it and move on.

  12. #12
    Join Date
    Jan 2005
    Location
    where it's nice and warm
    Posts
    276
    I would say if any unit is served a healthy dose of correct parts topped with proper adjustment will live to be an age old unit.

  13. #13
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,071
    Remember, no matter how old that Rack is. That it used to make set point.

    Some thing has happened, and it's almost never because it's old

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