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SIMPLICITY 
Orange Level
Joined: 19 Sep 2009
Location: ERATH LOUISIANA
Points: 509
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 Topic: FREON QUESTION
Posted: 04 Apr 2012 at 9:23pm |
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HELLO
ANYONE IN HERE EVER CONVERTED A R-12 SYSTEM ON A 70 SERIES TO 134A ? IF SO DID YOU CHANGE THE EXPANSION VALVE ? IF VALVE WAS CHANGED ANY SOURCE AND PART # WOULD BE VERY HELPFUL, ANY OTHER TIPS WOULD BE VERY APPRECIATED .
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MACK
Orange Level
Joined: 17 Nov 2009
Points: 7664
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Posted: 04 Apr 2012 at 9:36pm |
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Have converted alot by putting adaptors on lines and a new receiver dryer. MACK
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LouSWPA
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Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 25084
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Posted: 04 Apr 2012 at 9:40pm |
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No, you don't need to replace the expansion valve. Actually, there are now some reasonably priced replacement alternatives for R-12, rather than converting to 134
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I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
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dad2many
Silver Level
Joined: 19 Jun 2011
Location: NC
Points: 104
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Posted: 04 Apr 2012 at 9:44pm |
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The drop in replacements for r-12 a very reasonable compared to market price for 134a now. With the conversion the charge quantity is different and the valve ports need to be change. Other than that not a big deal.
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Eldon (WA)
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Joined: 11 Sep 2009
Location: Spokane, WA
Points: 7765
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Posted: 04 Apr 2012 at 9:51pm |
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Anyone need any R12 - I have 3 cans here....
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ALLIS EXPRESS!
This year:
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DouginIL
Silver Level
Joined: 11 Sep 2009
Location: Illinois
Points: 82
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Posted: 05 Apr 2012 at 9:08am |
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Eldon, I sent you a PM. Doug
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Moonlighter
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Joined: 22 Jul 2011
Location: MT
Points: 67
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Posted: 05 Apr 2012 at 11:10pm |
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Has any one heard of Red tec read about it never used it someone said it might be dangerous like anhydrous any ideas. Seems much cheaper
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Dave H
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Joined: 11 Sep 2009
Location: Central IL
Points: 3583
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Posted: 06 Apr 2012 at 6:59am |
google up Freeze 12 That is what I put in the neighbor's R 12 farm systems.
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JimD
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Joined: 11 Sep 2009
Location: Mounds, OK
Points: 2116
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Posted: 06 Apr 2012 at 9:11am |
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I have a can of freeze 12 sitting on the shelf. Let me know if someone needs it. I would have to lookup a fair price.
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Owner of OKtractor.com PM for an instant response on parts. Open M-F 9-6 Central. We have new and used parts. 877-378-6543
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JimD
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Joined: 11 Sep 2009
Location: Mounds, OK
Points: 2116
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Posted: 06 Apr 2012 at 9:12am |
We could get it wholesale, but I was told it was stopping production so I bought what I could. The 1 can is all I have left. I should also mention, I can get very reasonable prices on tractor AC parts.
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Owner of OKtractor.com PM for an instant response on parts. Open M-F 9-6 Central. We have new and used parts. 877-378-6543
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mlpankey
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Joined: 13 Sep 2009
Location: Vols country
Points: 4580
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Posted: 06 Apr 2012 at 9:29am |
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put 134 in it with a oil additive to make the mineral oil compatible and donnt look back. Some of the blends leak one blend more than the other and can't be toped off . So if you have a miniscule leak every season youll have to put a full charge in instead of a oz or 2 .
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DouginIL
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Joined: 11 Sep 2009
Location: Illinois
Points: 82
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Posted: 06 Apr 2012 at 3:54pm |
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Where can you buy the mineral oil additive? Is it a Brand name or what is called? Thanks!
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mlpankey
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Joined: 13 Sep 2009
Location: Vols country
Points: 4580
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Posted: 06 Apr 2012 at 4:18pm |
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The automotive parts stores like oriely or autozone in this area have it. It comes in a black tube you screw it onto the schrader valve fitting then turn a nut with a socket on the back to compress the additive into the system. I think its PAG oil from memory but not a 100 percent certain just ask a good parts guy with the info I posted and he should be able to get you hooked up with it.
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LouSWPA
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Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 25084
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Posted: 06 Apr 2012 at 5:14pm |
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actually, I've evacuated and recharged several systems w/R-134 and nothing else, and so far, have never had a problem. Mitch does bring up a point, though, systems designed to run w/R-12 will quite possibly require occasional top offs as the R-134 molecule is much smaller than the R-12 and will sneak out of places that the R-12 couldn't
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I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
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mlpankey
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Joined: 13 Sep 2009
Location: Vols country
Points: 4580
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Posted: 06 Apr 2012 at 5:19pm |
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I need to clarify that a little refrigerant blends will need the whole charge put in everytime with a leaky system . single component refrigerants like 12 and 134 can be topped off by adding a oz or 2 . if thats all that has leaked out. Blends not the case. heres what i was meaning according to Technical Chemical freeze 12 is 80 percent R134A and 20 percent hcfc-124B so when it leaks out is whats left the 80 percent 134 or the 20 percent r-124b who knows.
Edited by mlpankey - 06 Apr 2012 at 5:36pm
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LouSWPA
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Joined: 11 Sep 2009
Location: Clinton, Pa
Points: 25084
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Posted: 06 Apr 2012 at 6:17pm |
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good point Mitch.
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I am still confident of this;
I will see the goodness of the Lord in the land of the living.
Wait for the Lord;
be strong and take heart and wait for the Lord. Ps 27
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 06 Apr 2012 at 6:25pm |
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PAG oil is what all automotive systems run except for hybrids. PAG can cause a loss of isolation so POE is used. I've converted many 12 systems to 134 with only new valves and evac and recharge. In most cases 80% of the R12 capacity is what R134 charge ends up being.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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mlpankey
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Joined: 13 Sep 2009
Location: Vols country
Points: 4580
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Posted: 06 Apr 2012 at 9:49pm |
 LouSWPA wrote:
good point Mitch. |
Thanks Lou I am sure they will be two yahoos posting to attempt to discredit my post but thats life . Brian also added a good point about the 80 percent less .I will say that in order to get 80 percent to work for me the low pressure switch had to be changed from the r12 to a r134 low pressure switch or I had to over charge with 134 a tad over 80 percent to keep compressor from cycling .This is basically how the freeze 12 works the 80 percent 134 with the 20percent hcfc -124b runs the same or as close as you can get to pshycometric curve as pure r12.
Edited by mlpankey - 06 Apr 2012 at 9:55pm
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