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Post by coldspaces on Oct 27, 2013 13:54:28 GMT
I suspect the reason for GE using float valves was due to patents. The capillary tube was already patented by someone else (I think Crosley? - it's mentioned in Coldspace's scanned notes). That GE didn't like using other people's patents is evident also from a reluctance to use Freon 12. GE did patent a static high side restrictor metering device, but is sufficiently different to avoid a patent conflict. You have a good memory for what you have read. My 1935 manual show the original patent # for cap tubes. It was not issued to Crosley but it looks like they are one of the first to use them. First cap tube patent #1919500 www.google.com/patents/US1919500?pg=PA2&dq=1919500&hl=en&sa=X&ei=xBltUq3MCOTB2wWOwIDYCA&ved=0CD4Q6AEwAQ
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Post by coldspaces on Oct 27, 2013 14:05:56 GMT
I think what makes the GE systems a little dirty could be byproducts from the motor being exposed to the S02. Over many years these tend to collect as deposits inside the piping, especially the high side of the system,float valve ect. So do you think it was entirely the motor heat causing the less cleaner system or a combination of the heat and maybe the motor insulation breaking down chemically with the So2? Here is what my 35 manual suggests for reasons oil carbonizes when used with so2. Same basic reasons as most refrigerants. Moisture and/or air in system and hi head temps.
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Post by jhigdon2 on Oct 27, 2013 17:42:24 GMT
I think it's possibly heat combined with cotton insulation, Off gassing over the years. creates kind of a black soot that clings to high side of system. I once heard that cotton insulation overheated emits H20 as one of the byproducts.
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Post by coldspaces on Oct 27, 2013 22:22:07 GMT
I think it's possibly heat combined with cotton insulation, Off gassing over the years. creates kind of a black soot that clings to high side of system. I once heard that cotton insulation overheated emits H20 as one of the byproducts. I think you are correct. One of the manuals, maybe my 1935 states that the cotton insulation breaking down caused problems when they started to use r-12. The r-12 would not absorb the moisture created so the metering device would freeze and block off the flow of refrigerant.
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