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16-03-2010, 08:04 PM #1
Retrofitting R22 In a split system
I've been called to a job tomorrow that is faulting on "LP", luckily we can still get hold of reclaimed R22 from the suppliers but i'm wondering has anyone relaced R22 yet in a split system and if so what have they used? and is it a direct replacement.
Everyone that i ask doesn't seem to know and as of yet we haven't had to retrofit any.The difference between genius and stupidity is that genius has its limits.
Marc
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16-03-2010, 09:30 PM #2
Re: Retrofitting R22 In a split system
Tried some R417a in a crappy old hitachi wall mount split, pressures were low - pressure was always low, before the leak, even on the R22. So can't really give you much info. Hopefully next time I use it, it will be on a more modern unit with a bit more quality to start with.
Andy
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16-03-2010, 10:14 PM #3
Re: Retrofitting R22 In a split system
yea have been using r417a as a replacement and it seems to be fine, have found it usaly runs around 50 - 60 on the suction
417 for cappillary device
422 for expansion valve
agas have a good sheet out on what replaces what etcLast edited by thebigcheese; 16-03-2010 at 10:24 PM.
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17-03-2010, 10:50 AM #4
Re: Retrofitting R22 In a split system
R417A seems to work fine in split A/C systems. I have found that you often need to charge to about 90% by weight of refrigerant when compared to the R22 quantity. You might need to trim this charge amount slightly, but start at 90%. Pressures appear to be similar to R22, maybe slightly lower, but achieved temperatures seem to be OK.
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17-03-2010, 06:35 PM #5
Re: Retrofitting R22 In a split system
Good stuff, i'm prepared now when R22 runs out, thanks.
The difference between genius and stupidity is that genius has its limits.
Marc
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17-03-2010, 07:05 PM #6
Re: Retrofitting R22 In a split system
Any luck with 417 in a pack? Is it a good option as say converting to 404a?
Alec
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17-03-2010, 08:00 PM #7
Re: Retrofitting R22 In a split system
al we have been using 422d for most refrigeration aps, seems to be ok
aparently r407a is great if you can do an oil change
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17-03-2010, 09:05 PM #8
Re: Retrofitting R22 In a split system
My only worry with the oil change is o rings leaking, otherwise i'd go with 404a.
alec
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26-04-2010, 09:13 AM #9
Re: Retrofitting R22 In a split system
If you change directly to 417a and not change the oil, you will also have lubricity problems, as it is not very miscible with the MO. Only 3% of it is a HC, miscible with MO, whereas 97% is a HFC.
A nice solution would be to clean the circuit out of MO and put 407 and POE. BEsides, you can earn some COP and CAP with the total cleaning of the plant.
check this link:
www.fri3oilsystem.com/june.zip
there you have the different retrofit options, so you can decide which one is more suitable for you.
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28-04-2010, 07:44 PM #10
Re: Retrofitting R22 In a split system
I use R407C only mention on the synthetic oil and filter change (as is) no flushing system, and possibly if it is long and it is suspected that there remained a mineral oil, possibly under pressure of nitrogen blows.
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29-04-2010, 08:36 AM #11
Re: Retrofitting R22 In a split system
If you leave over 5% of remaining MO, you will end up having a phases separation, and a damage of the lubricity index, that will finally break the compressors, specially if there is a leak.
So the best solution is to clean entirely the system.
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