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Old 07-28-2014, 10:20 AM   #1
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walk in cooler not cooling all of a sudden


Just over night my cooler went from 40 to 50 degrees i have replaced compressor/condenser r22 -- expansion valve in the last two months as well re-charged system with envirosafe r22a -- working fine for a few months then ? evap not clogged -- if i turn fans off i can hear freon flowing thru expansion valve -- set at 60lbs suction line which is 38-40 degrees but cooler will not drop below 50 ? i am stumped -- some help would be great thank you d.k.

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Old 07-28-2014, 11:36 AM   #2
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walk in cooler not cooling all of a sudden


Does r22a have the same requirement as r22 in terms of pressure/temp ?

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Old 07-28-2014, 11:41 AM   #3
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walk in cooler not cooling all of a sudden


no it actually takes less 1 oz of 22a = 2.5 oz of 22 by their chart

Temp Pressure Temp Pressure
F psig F psig
-44 0 84 137.9
-40 0.03 88 146.5
-36 0.03 92 155.4
-32 0.03 96 164.7
-28 6.6 100 174.3
-24 8.6 104 184.4
-20 10.7 108 194.8
-16 13 112 205.6
-12 15.5 116 216.8
-8 18.1 120 228.4
-4 20.8 124 240.5
0 23.7 128 252.9
4 26.9 132 265.9
8 30.2 136 279.2
12 33.6 140 293
16 37.3 144 307.3
20 41.2 148 322.1
24 45.3 152 337.4
28 49.7 156 353.1
32 54.2 160 369.4
36 59 164 386.2
40 64.1 168 403.6
44 69.4 172 421.5
48 74.9 176 440
52 80.8 180 459.1
56 86.8 184 478.8
60 93.2 188 499.2
64 99.9 192 520.3
68 106.9 196 542.

http://www.ecofreeez.com/ef22a.html

Last edited by trapnfish; 07-28-2014 at 11:47 AM.
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Old 07-28-2014, 02:23 PM   #4
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also I can not seem to get sight glass to clear up ? even OVER FILLING it !!!
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Old 07-28-2014, 08:31 PM   #5
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walk in cooler not cooling all of a sudden


R22A is illegal to use in the USA.
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Old 07-29-2014, 06:57 AM   #6
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r22a is illegal to use in the usa.
i am not useing r22a read the forum sir !!!!

EF22A

Last edited by kwikfishron; 07-29-2014 at 03:54 PM. Reason: PC
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Old 07-29-2014, 07:59 AM   #7
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walk in cooler not cooling all of a sudden


I read your forum and you did say R22A, but regardless R22a, EF22a,Envirosafe R22a, are all basically the same thing they claim to be drop in replacements for R22 and they all have PROPANE in them and are currently under investigation because of explosive issues and as far as I know are not legal in the USA just as beenthere posted.
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Old 07-29-2014, 08:26 AM   #8
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Originally Posted by KKinnaman View Post
I read your forum and you did say R22A, but regardless R22a, EF22a,Envirosafe R22a, are all basically the same thing they claim to be drop in replacements for R22 and they all have PROPANE in them and are currently under investigation because of explosive issues and as far as I know are not legal in the USA just as beenthere posted.
i know but at this point i have NO choice in repairing what is in the unit -- so far the E22 is ok to use -- i am a small tavern in the forest -- food prices and no tourism is killing us but i dont want and cant afford to update to 134a so i am backed into a corner at this point !!! thank you
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Old 07-29-2014, 08:33 AM   #9
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walk in cooler not cooling all of a sudden


This morning the evap is frost free but the EXPANSION valve fingers coming out the top are frosted/iced up -- so i am re-replacing expan valve today along with the filter dryer -- reclaiming old freon and putting in NEW -- hopefully this fixes it ? I AM REALLY frustrated at this point -- i have replaced comp/dryer/expan-valve/condenser . ALL in the last year -- and i did flush system with nitrogen to remove moisture !!!

Last edited by trapnfish; 07-29-2014 at 08:36 AM.
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Old 07-29-2014, 08:42 AM   #10
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walk in cooler not cooling all of a sudden


I am a refrig tech also but don't know what the normal operating parameters are for that stuff.

Sounds to me like the compressor is not pumping properly. Is it a scroll or recip?

If it is a recip and the suction valve is not seating then you can add lots of extra Freon and the sightglass still won't fill. If it is not building up enough discharge then the TX won't modulate properly either. Maybe those compressors do not like that r22a and it is killing them? May take a year of running and some other failures from other people to find out. I am sure Copeland did not design it to work with r22a and probably it voids the warranty. The manufacturer of r22a can claim any da*mn thing they want as they just want to sell it and it takes a few years B4 the real problems show up. If you had r22 in then you could check the compression ratio but with r22a you are kinda on your own.
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Old 07-29-2014, 08:50 AM   #11
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Originally Posted by yuri View Post
I am a refrig tech also but don't know what the normal operating parameters are for that stuff.

Sounds to me like the compressor is not pumping properly. Is it a scroll or recip?

If it is a recip and the suction valve is not seating then you can add lots of extra Freon and the sightglass still won't fill. If it is not building up enough discharge then the TX won't modulate properly either. Maybe those compressors do not like that r22a and it is killing them? May take a year of running and some other failures from other people to find out. I am sure Copeland did not design it to work with r22a and probably it voids the warranty. The manufacturer of r22a can claim any da*mn thing they want as they just want to sell it and it takes a few years B4 the real problems show up. If you had r22 in then you could check the compression ratio but with r22a you are kinda on your own.
thank you -- it is a RECIP type comp /Tecumseh # AW500ET-088- when I shut it down both sides do equalize -- so I am hoping that the comp is ok thanks for the info -- I guess if I have to replace comp again I will switch over to 134a

Last edited by trapnfish; 07-29-2014 at 08:54 AM.
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Old 07-29-2014, 08:54 AM   #12
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walk in cooler not cooling all of a sudden


Sounds to me like the suction is too high and that gives you a high evap temp. Probably the scroll compressor got damaged somehow. Maybe it runs hotter with that r22a or it diluted the oil and screwed it up.

Best to go with the 134a.
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Old 07-29-2014, 08:59 AM   #13
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THANKS FOR THE INFO -- I pray the expansion valve fixes this -- I just walked down stairs and checked condenser top line hot bottom line cooler than top so I know cond is ok --
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Old 07-29-2014, 09:17 AM   #14
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walk in cooler not cooling all of a sudden


Make sure you mount the TX valve bulb tightly with copper straps and in the correct position. Very rare they fail but a loose bulb will cause it to flood the evap.
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Old 07-29-2014, 10:59 AM   #15
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walk in cooler not cooling all of a sudden


Looks like you know a lot of AC systems already. I don't even think you need to come to this DIY forum to get help. May be you can come here to help other people if you have time. What you are doing is something out of the norm, you just have to try it out, and you may get it right after a few try.

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