View Full Version : Replacement for sulfur dioxide refrigerant??
05-19-2009, 09:49 AM
Is there a drop in replacement for sulfur dioxide refrigerant used in the pre 1930 GE Monitor Tops?
I'm curious if anyone else has experience working on this old stuff.
Poodle Head Mikey
05-19-2009, 12:57 PM
One time when I was a very young lad a guy asked me if I could get the refrigerator going in this huge old house he had bought. The kitchen "refrigerator" was about five feet square, up on legs, all natural oak and porcelain panels.
Condensing unit was remote in the cellar. Ancient motor, big open motor starter, flat belt drive. There was a wood panel on the wall with mounted pressure gauge and some valves. No refrigerant in the system. I fixed a leak at a flare fitting, pulled a vacuum overnight and then charged it with R-12. It worked for years after that. Turned out it was supposed to be sulfur dioxide.
Oh; maybe it was methylene chloride? I'm not sure now that I'm talking about it.
I remember that the refrigerant control was by low-side float.
05-19-2009, 01:12 PM
R12 will work fine in an old SO2 or Methyl Chloride system. My father converted many units 50-60 years ago. I remember we had a commercial 2-door Frigidaire...then a division of General Motors...with a 1/2 hp belt drive unit that was SO2 and a 5 gallon Mills ice cream maker with Methyl in the cellar....both which got converted to R12.
They ran fine for another 20 years or more.
If you want to go GREEN, look into DuPont's Isceon MO49 Plus (R437A).
Poodle Head Mikey
05-19-2009, 01:50 PM
I was just joking about using R-12 now - one obsolete refrigerant for another obsolete refrigerant. <g>
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