Page 1 of 2 12 LastLast
Results 1 to 13 of 14
  1. #1
    Join Date
    Sep 2002
    Posts
    12,303

    mis-matched TXV's ? 502 valve w/ 404 ?

    Now clearly a 12 TXV on a 22 or 502 system will not work at all. The internal pressures of the valve will never overcome the evap pressure force and the evap will starve for refrigerant flow. Got it.

    But with say; 22 and 502 - what would happen? The pressures are pretty close - that is; within the normal operating range of the valve. Once the SSH was set wouldn't the valve just carry on? Maybe hunt a little at times, but pretty much 'work'?

    Which leads me to my present confrontation: An R-502 (well; purple power head label anyway <g>) flowing R-404 refrigerant.

    Actually; I'm not even positive about That. It may well be a R-404 condensing unit piped to a R-502 evap, and then charged with R-22.

    Hmmmmm . . . . how can I determine for certain What refrigerant is in the system? I mean without replacing it. <g>

    Anyway, my original question is: will there be any substantial performance or reliability gain from replacing the 502 valve with a 404 valve?
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  2. #2
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,507
    Quote Originally Posted by Poodle Head Mikey View Post
    Now clearly a 12 TXV on a 22 or 502 system will not work at all. The internal pressures of the valve will never overcome the evap pressure force and the evap will starve for refrigerant flow. Got it.

    But with say; 22 and 502 - what would happen? The pressures are pretty close - that is; within the normal operating range of the valve. Once the SSH was set wouldn't the valve just carry on? Maybe hunt a little at times, but pretty much 'work'?

    Which leads me to my present confrontation: An R-502 (well; purple power head label anyway <g>) flowing R-404 refrigerant.

    Actually; I'm not even positive about That. It may well be a R-404 condensing unit piped to a R-502 evap, and then charged with R-22.

    Hmmmmm . . . . how can I determine for certain What refrigerant is in the system? I mean without replacing it. <g>

    Anyway, my original question is: will there be any substantial performance or reliability gain from replacing the 502 valve with a 404 valve?
    I'm not sure how your going to tell what juice or juicesya I seen that before.Now as for the txv's I have retro all out 502 racks with hp80 and did not replace the txv's or power heads. And when I do I use a kt43 sz or sc. Hope this helps some.
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

  3. #3
    Join Date
    Sep 2002
    Posts
    12,303

    Your comment kind of makes me laugh

    Because really; the simplest thing For Me to do would be to leave the R-502 TXV, pull the existing refrigerant, and charge the system with R-502.

    Because I have at least 50 lbs here with no likely home for it. <g>
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  4. #4
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,331
    Quote Originally Posted by Poodle Head Mikey View Post

    Anyway, my original question is: will there be any substantial performance or reliability gain from replacing the 502 valve with a 404 valve?
    The original R502 TEV will work just fine with R404A, both with repect to valve capacity and the thermostatic element's charge.

    The current Sporlan "S" charged element is rated for R404A, R507, R402A and R502.

  5. #5
    Join Date
    Sep 2002
    Posts
    12,303

    Thanks! Now if I can just get it to run!

    Now if I can just get it to keep running - without constantly locking out on oil failure. <g>

    BTW: does the use of "txv" bother you? And you would prefer to have everyone use "tev" ?

    PHM
    --------

    Quote Originally Posted by icemeister View Post
    The original R502 TEV will work just fine with R404A, both with repect to valve capacity and the thermostatic element's charge.

    The current Sporlan "S" charged element is rated for R404A, R507, R402A and R502.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  6. #6
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,336
    Quote Originally Posted by Poodle Head Mikey View Post
    Now if I can just get it to keep running - without constantly locking out on oil failure. <g>

    BTW: does the use of "txv" bother you? And you would prefer to have everyone use "tev" ?

    PHM
    --------
    And we are going to start referring to DX coils as DE coils?

  7. #7
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,331
    Quote Originally Posted by Poodle Head Mikey View Post
    BTW: does the use of "txv" bother you? And you would prefer to have everyone use "tev" ?
    It's only because I consider Sporlan to be the standard bearer when it comes to Thermal Expansion Valves....and they use the term TEV as opposed to TXV (which is used by Alco).

  8. #8
    Join Date
    Sep 2002
    Posts
    12,303

    I have always thought Alco to be the superior part <g>

    More industrial-strength or something. <g>

    PHM
    --------



    Quote Originally Posted by icemeister View Post
    It's only because I consider Sporlan to be the standard bearer when it comes to Thermal Expansion Valves....and they use the term TEV as opposed to TXV (which is used by Alco).
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  9. #9
    Join Date
    Mar 2009
    Posts
    174
    On a side note, I had a whole line up of M5's (17 valves). They came with danfoss valves stamped 404a. The sys was 408a. No problem for sporlan. When I started the sys it flooded back so bad that the discharge was cold. Shut it down and rounded up 17 balanced ports. Installed them with a helper and had it running by 11 o'clock. Found out latter that danfoss valves only work with what is stamped on them.

  10. #10
    Join Date
    Aug 2007
    Location
    Winter Haven, FL
    Posts
    4,367
    I have found out that a r-22 valve does not work well with 408. It barely worked with 502.

  11. #11
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    Quote Originally Posted by cold spell View Post
    On a side note, I had a whole line up of M5's (17 valves). They came with danfoss valves stamped 404a. The sys was 408a. No problem for sporlan. When I started the sys it flooded back so bad that the discharge was cold. Shut it down and rounded up 17 balanced ports. Installed them with a helper and had it running by 11 o'clock. Found out latter that danfoss valves only work with what is stamped on them.
    Danfoss valves are ultra sensitive and very touchy, even when applied correctly.

  12. #12
    Join Date
    Jul 2008
    Posts
    21

    Txv is fine

    The use of TXV when refering to a thermal expansion valve is industry standard, just as an electronic expansion valve is refered to as an EXV and an automatic expansion valve is a AXV and so on.

  13. #13
    Join Date
    Sep 2002
    Posts
    12,303

    Now that we've opened the Gates Of Time - R-22 versus R-404

    A few years ago I ordered two MT R-404 condensing units and six evap coils. We installed and piped and started. Adjust, adjust, adjust - could not get the SSH down.

    Finally I climbed up to a coil myself, with a mirror - and found an R-22 TEV. soon after that I found five more R-22 valves.

    Oh sorry dude; we will ship you out six R-404 valves right away.

    The job is running, I ordered the coils complete: valves, stats, solenoid valves.

    Huh; well we will send you the right valves.

    What about the time, trouble, labor, and down-time?

    Can't help you.

    So anyway - my point is that while R-502 valves may work with R-404 - R-22 valves apparently Will Not work well with R-404. <g>

    PHM
    ------





    Quote Originally Posted by icemeister View Post
    The original R502 TEV will work just fine with R404A, both with repect to valve capacity and the thermostatic element's charge.

    The current Sporlan "S" charged element is rated for R404A, R507, R402A and R502.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event