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

[Poodle Head Mikey]

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?

[crackertech]

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.

[Poodle Head Mikey]

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>

[icemeister]

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.

[Poodle Head Mikey]

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
--------

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.

[ascj]

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?

[icemeister]

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).

[Poodle Head Mikey]

More industrial-strength or something. <g>

PHM
--------

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).

[cold spell]

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.

[Joe Harper]

I have found out that a r-22 valve does not work well with 408. It barely worked with 502.

[condenseddave]

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.

[jimmyd5]

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.

[Poodle Head Mikey]

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
------

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.