R22 as a trace with Nitrogen in R410 system.

[shaygetz]

Aye...all this technical talk makes me long for the old daze when our refridgerant recovery tool kit consisted of a good set of dikes to cut the high side and let 'er blow...

[Beercanman]

There is no R410A in the system when you put the R22 in, so you are not mixing refrigerants. After you find the leak, the leak is repaired with nitrogen flowing, the system is then pressure tested with nitrogen, and vacuumed, so no R22 remains in the system.

Exactly.

[actechmurray]

The only time you should pull out your r-22 tank is when charging an r-22 system. I'm just sayin'

[jpsmith1cm]

The only time you should pull out your r-22 tank is when charging an r-22 system. I'm just sayin'

Yet you haven't been able to refute anything I've said technically, only to say that your opinion is that putting R-22 in a R410a system as a trace gas is wrong.

[beenthere]

The only time you should pull out your r-22 tank is when charging an r-22 system. I'm just sayin'

Please post a manufacturers stance or recommendation that says what your saying.

[isuredo]

Aye...all this technical talk makes me long for the old daze when our refridgerant recovery tool kit consisted of a good set of dikes to cut the high side and let 'er blow...

lol, thats what we still use! shhhhhh!!!

[stonefly]

perhaps you're struggling with the moral dilema of releasing 4 ounces of r-22 into the atmosphere that you could have avoided?

[markvilleman]

I never used trace gas for AC, only nitrogen I use for leak test.

[actechmurray]

Please post a manufacturers stance or recommendation that says what your saying.

Ok I'll look

[Green Mountain]

I'm under the impression that only R-22 can be released with nitrogen when used for leak testing under 608.

I see no reason that you can't use R-22 for leak testing in a R-410a unit, you will be pulling a vacuum.


Then again a standing pressure test with nitro and pulling a 500 micron vac that holds should suffice. I only use a tracer gas if I can't easily find my leak.

I agree also. We just but in a system that took 62 lbs of 410A. There was a lot of piping so we really wanted to make sure we had no leaks. It took 2 days with 2-5cfm vac. pumps to achieve a 500 micron vacuum.

[garyed]

So u introduce r-22 Into a 410a system to find leaks?

Some manufacturers are even recommending using R-22 to flush the line sets instead of RX11 on their 410a systems.

[jpsmith1cm]

Some manufacturers are even recommending using R-22 to flush the line sets instead of RX11 on their 410a systems.

Wouldn't that be illegal?

I'm not sure that I follow the procedure to be used.

[beenthere]

Wouldn't that be illegal?

I'm not sure that I follow the procedure to be used.

Not if you recover it.

[second opinion]

Some manufacturers are even recommending using R-22 to flush the line sets instead of RX11 on their 410a systems.

Who would these manufacturers be?

[garyed]

Wouldn't that be illegal?
I'm not sure that I follow the procedure to be used.

The R22 used to flush the line set still needs to be recovered.

Who would these manufacturers be?

I've seen at least two documents referring to flushing with R-22, one from Rheem & one I think was from Trane. Here is the one from Rheem:

[catmanacman]

I have put r22 in a 410a a system to find a leak because my h10 will not detect 410a and I could not find the leak with a pos 410a leak detector I had already recovered all the refer out and was going to do a isolation and decided what the heck and I will do it again if needed .as has been said there is no oil in a refrigerant jug

[PremiumServices]

I've just read that Rheem document and man, it takes a lot of R-22 to flush the lines as per the procedure described there.

If replacing both unit and just flushing lines its easyer to use Rx11 or ProFlush, if you leaving piston or txv in place than I'd say to use freon.

Is there any reason not to use R-410A instead of R-22? Just use R-410a and recover it the same way, I don't see any harm. The refrigerant is only being used as a flushing agent anyway.

[garyed]

I've just read that Rheem document and man, it takes a lot of R-22 to flush the lines as per the procedure described there.

If replacing both unit and just flushing lines its easyer to use Rx11 or ProFlush, if you leaving piston or txv in place than I'd say to use freon.

Is there any reason not to use R-410A instead of R-22? Just use R-410a and recover it the same way, I don't see any harm. The refrigerant is only being used as a flushing agent anyway.

The first few 410A change overs I used the RX11 flush but I forgot to pick up any flush one time so I just used plain nitro as a flush. Ever since that's all I've used without a problem. I would guess that the majority of manufacturers today do not recommend using RX11. I've never used the R22 method but I do think the industry is steering away from putting chemicals besides refrigerant & oil into the system.

[catmanacman]

The first few 410A change overs I used the RX11 flush but I forgot to pick up any flush one time so I just used plain nitro as a flush. Ever since that's all I've used without a problem. I would guess that the majority of manufacturers today do not recommend using RX11. I've never used the R22 method but I do think the industry is steering away from putting chemicals besides refrigerant & oil into the system.

my opinion is blow the lines with nitrogen only unless it is a burned out compressor ,if it's a burn out flush them .I do agree it's best to replace them if possible

[PremiumServices]

I had a factory tech tell me that I needed to use Rx11 or Proflush to clean the lineset in a condo. I explained it was a full replacement, no burn-out and I had flushed the system with nitro because I was afraid some flush would stay under the building (buried lines) and he said if you flush with chemical then with nitro and triple vac the whole residue boils off.

Still I only use flushing if there was a burned-out compressor and I always test for acidity before recovering refrigerant to see if the system is free from acid.