Results 1 to 13 of 14
06-07-2009, 11:24 AM #1
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
06-07-2009, 11:38 AM #2
06-07-2009, 12:34 PM #3
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
06-07-2009, 12:54 PM #4
06-07-2009, 01:01 PM #5
06-07-2009, 01:07 PM #6
06-07-2009, 01:51 PM #7
06-07-2009, 01:59 PM #8
06-07-2009, 02:37 PM #9
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.
06-07-2009, 10:49 PM #10
I have found out that a r-22 valve does not work well with 408. It barely worked with 502.
06-10-2009, 12:33 AM #11
06-07-2012, 02:57 PM #12Regular Guest
- Join Date
- Jul 2008
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.
06-07-2012, 03:29 PM #13
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>