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Post by Iceman52 on Aug 20, 2016 20:41:05 GMT
Hi all. I found another CA2-B16 and picked it up last night. S#4223324. I just came in from inspecting it and the compressor actually turns on and runs with the controls.. I took the top off and the small line that comes out of the float seat is broken right where it goes into the fitting. I will think should I just cut to the chase and install a capillary tube in it since I will also need t get some
MF also.
Is there a place to perches MF in the states in the amount I will need?
Thanks.
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Post by ckfan on Aug 20, 2016 21:57:39 GMT
Sorry to hear that the line is broken on it. Hopefully the evaporator isn't all clogged up with gunk from being exposed to atmosphere for a long while.
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Post by Iceman52 on Aug 21, 2016 3:51:46 GMT
Hi all. I am not really up on refrigeration systems. Mostly I worked on Auto Ac systems.I have a few questions. With the tube broke off the bottom of the float valve how do I go about cleaning the system of MF so I can repair it? Should I run Nitrogen through it. I don't want nothing catching on fire because of MF Just not real sure on how to go about doing it.
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Post by cablehack on Aug 21, 2016 23:41:07 GMT
The classic case of a CA with a broken high side tube. How well I know that procedure. If you haven't already seen my site with my tales of woe regarding CA's and broken high side tubes, see here members.iinet.net.au/~cool386/ge/ge1.html and members.iinet.net.au/~cool386/ge_ca1/ge_ca1.html and here members.iinet.net.au/~cool386/conversion/capconversion.htmlYes, do a cap conversion. Don't waste your time doing lots of work only to find the float valve is worn. The cap tube is as good as, if not better than the float valve, so you won't be sacrificing performance. You're going to need methyl formate and nitrogen. Some of the other members here are in a better position to advise of getting MF as things may be different in my part of the world. Here, they will not sell to a residential address, and I understand that also applies in the U.S. So, you'll need a company address. You'll need to set up an account with Sigma Aldrich which you do on the internet and order the 99% anhydrous methyl formate. You'll need about 1.2 litres, which means buying 2x litre bottles or 1x 2l bottle. I wouldn't bother trying to reuse the existing MF if the system has been open for very long - it absorbs moisture. Depending how long the system has been open for, some or all of it will have evaporated already. You can simply connect a vacuum pump to the charge valve to get the remainder out. Do this outside of course and away from ignition sources. Alternatively, you could run the compressor and connect a tube to the charge valve that empties into a bottle. This won't get all of it out however, so you'll still need to vacuum it. Having vacuumed it down to 29 inches, fill with nitrogen to a few PSI, vacuum again, then refill with nitrogen. Now it will be ready for working on. You want it filled with nitrogen while soldering with an oxy torch also to reduce the oxide formation. Having got this far, now is the ideal time to get the evaporator off and restore/rewire the cabinet top, and check that the evaporator is not blocked. |
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Post by Iceman52 on Aug 22, 2016 1:27:43 GMT
Thanks cablehack for all the advice. I made an account with Sigma Aldrich and getting a company address hopefully sometime tomorrow. I have a cap tube on order, silver solder and a micro vacuum gauge coming also. Will need to get a bottle of nitrogen still. Will keep all updated on how things are going. I will rewire and go over everything and check the evaporator also before I put it back together.
I don't think it was broken long because I have what looks and feel like oil in the bottom of the cabinet and when I ran it a few seconds I found some wetness on the shop floor. I was thinking did I break it taking the top off, But it came off with no problem. It might of snapped bring it home. But there was no smell of any kind of MF when I seen the liquid in the bottom. I did checked the inside before loading it on my truck and it was free of any kind of liquid. The more I think about it I bet it broke on the way home. The top stayed on it I had top and bottom strapped together and laid it down on the back of the cabinet. Oh well no use crying over spelt milk for sure.
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Post by cablehack on Aug 22, 2016 2:46:45 GMT
The Sigma Aldrich catalog number for the one litre bottles is: 291056-1L METHYL FORMATE, ANHYDROUS, 99%.
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Post by Iceman52 on Aug 29, 2016 21:46:16 GMT
Cablehack. I was reading over the procedure for the repair I need to do. Trying to get everything together. On the REFILLING part. You said (I also added a likely looking amount of compressor oil (mineral type 4GS)} Are you saying you added just about the same amount >1.29lbs of compressor oil?
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Post by cablehack on Aug 30, 2016 2:40:20 GMT
I added compressor oil to my CA-1 because the previous owner had run it with the high side tube broken. There was oil on the bottom of the cabinet and down the side of the evaporator. So, I just estimated how much that was and put the same amount back. It was not very much really, just about half a funnel full. I have also added a little oil to my CA-2 because of the amount of times I've evacuated it and probably lost a little oil with the refrigerant recovery.
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Post by Iceman52 on Aug 30, 2016 12:27:31 GMT
That is the same thing I had happen on this one, oil in the frig and some on the floor. I say around 1/2 cup of oil give or take. Thanks for the info.
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Post by Iceman52 on Sept 1, 2016 12:04:36 GMT
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Post by cablehack on Sept 1, 2016 23:17:59 GMT
I know at least three of the members on this forum have been able to get methyl formate in the U.S., so perhaps they can convey their experiences. One other option is to see if you can get some R11 or R123 refrigerant. www.ebay.com/itm/R-11-Refrigerant-/172179984064Pity I'm not in the U.S or I'd buy that R11 myself. BTW, you'll need to experiment if using a cap tube with something besides MF. |
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Post by Iceman52 on Sept 2, 2016 1:47:49 GMT
Hi I did a little mods on the forum they wanted and resent it in . And just sent another e-mail to them getting the address right which some how they had wrong and a better explanation as to what I will be using it for. here is what I told them (I am trying an experiment in a rotary refrigeration compressor that will run at a slower speed which is the key, so it will last longer and use less electrical power using Methyl Formate as a refrigerant. Some of the first refrigeration units made by General Electric used MF for the refrigerant.) I might be stretching the truth some? I shall see if that might work LOL. Bureaucratic BS is just wonderful anymore!!!
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Post by Iceman52 on Sept 2, 2016 2:06:59 GMT
Just to let you know I have a around 8# from a 30# cylinder of R12 here and maybe 2# of R22 also. I also have a refrigerant license from when I worked on ac in heavy equipment. I am not done as yet I kind of lined up a few business with tax ID # also today so if the Sigma-Aldrich fall through I will try the Spectrum Chemical Comp.
Its not over till its over. If all ells fails I know I can get Freon.
Jack
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Post by vintageguy on Sept 2, 2016 4:39:45 GMT
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Post by vintageguy on Sept 2, 2016 4:41:42 GMT
You can get a Federal tax ID number online for free. It's actually called a Federal Employee Identification Number (F.E.I.N.), Lots of contractors have them simply because they don't want to use their Social Security numbers on everything.
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