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DR OIL
Oct 16, 2013 22:25:52 GMT
Post by allan on Oct 16, 2013 22:25:52 GMT
Is SO2 in a DR miscible with the mineral oil charge it has from the factory{original}?
Has anyone tried recharging a SO2 machine with R600? If so what were the results?
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DR OIL
Oct 16, 2013 23:05:23 GMT
Post by cablehack on Oct 16, 2013 23:05:23 GMT
I understand that it is not miscible. There was a brief mention of isobutane working very well in a CK in the Yahoo group, and with a capillary conversion, but the person who owned it wasn't interested in discussing it. I don't know exactly what hydrocarbon was used, but the p/t chart tells that R600a would be the best.
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DR OIL
Oct 16, 2013 23:09:46 GMT
Post by ChrisJ on Oct 16, 2013 23:09:46 GMT
Actually cablehack if you look at the evaporator patent for the CA machine it suggests (I think) that SO2 is miscible with the oil which is why they show a straight equalizer option.
Did I misunderstand it?
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DR OIL
Oct 16, 2013 23:28:41 GMT
Post by cablehack on Oct 16, 2013 23:28:41 GMT
Yes I thought about the evaporator equaliser tube differences, but the patent seems to mention the differences being due to different densities rather than actual mixing. But, I'm not 100% sure on my interpretation.
What I was thinking of was the troubles with DR's where the evaporators fill up with oil - my assumption was that if it was miscible this characteristic would not occur. Also, in the SO2 notes posted by Coldspaces it says "The oils used with sulphur dioxide rise and float on top of the liquid, which makes the removal of oil from the evaporator an extremely simple matter."
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DR OIL
Oct 17, 2013 0:17:23 GMT
Post by ChrisJ on Oct 17, 2013 0:17:23 GMT
Ah. Good points.
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DR OIL
Oct 17, 2013 3:19:47 GMT
Post by coldspaces on Oct 17, 2013 3:19:47 GMT
"The oils used with sulphur dioxide rise and float on top of the liquid, which makes the removal of oil from the evaporator an extremely simple matter." And I first learned this from jhigdon2 when I was trying to make my Dr run on r-12. Flooded evaps should return the oil even if not miscible with the refrigerant. This combined with the suction line restricter is allowing us to run 134a and mineral oil in our so2 machines. |
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DR OIL
Sept 25, 2014 3:50:25 GMT
Post by coldspaces on Sept 25, 2014 3:50:25 GMT
I purchased a 1938 refrigeration supply catalog this week. Wasn't sure it was worth the price but it is from the right time to have info on the Monitor Tops. I found this of interest about oils. I believe that we have discussed before that 150 viscosity mineral oil is just fine in our refrigerating machines and would like to clarify this before I charge Travis's DR-3 with its final oil charge someday. Here they recommend the #5 oil for GE reciprocating machines with sulfur refrigerant. It looks like the #5 is a lower viscosity(75-85@100f) than the modern 150 oil is (155@100f). I am not sure if the method for testing was the same back then thorough. This at least should give us a reference as to what they were selling for them back in the day. I am pretty sure the modern 150 viscosity is as close as we will get.  |
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DR OIL
Sept 25, 2014 4:54:50 GMT
Post by cablehack on Sept 25, 2014 4:54:50 GMT
Very interesting; thanks for posting it. Is there any other GE stuff listed in the catalog?
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