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Post by coldspaces on Feb 12, 2014 6:39:03 GMT
I agree. There is great minds at work here. When converting an R12 system to R134 I think you have to lengthen cap tube a little and make the weight adjustment for the difference in density. But if these systems worked for 6 months, and had good performance then it may just need a little more oil. I have a little R22 ductless split heat pump at my business. The condenser unit is on the roof and with only 13oz of oil in the system it seems to survive year after year, even though the compressor is 5 or 6 feet above the indoor unit. It kinda puzzles me, but I guess it's proof that it can be done. Velocity of the refrigerant carry's the oil back on modern systems. 40f air conditioning evaps keep the oil thinner than colder running refrigeration evaps and is more forgiving at oil return as long as the velocity is there in the suction line to move the oil. Coldspaces |
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Post by jhigdon2 on Feb 12, 2014 6:45:06 GMT
Ah ha. I wonder if that's why the FEA evap are less volume. To increase velocity to carry oil back to compressor.
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Post by coldspaces on Feb 12, 2014 6:54:26 GMT
Ah ha. I wonder if that's why the FEA evap are less volume. To increase velocity to carry oil back to compressor. That is a dry type evap isn't it? If so isn't that how all the dry type work? Here is another thought, can we just add an oil separator and keep if from leaving to begin with? henrytech.com/Tips/HT-TT4.pdf Looks like they make them down to 1/2 ton capacity and 1/4" connections. Would the separator and a sight glass added in the compressor shell to adjust the level of extra oil needed properly be realistic? Almost sounds easier than adding an extra oil reservoir. Plus the less oil in the evap the more heat transfer area available, might be more efficient? Not sure where the separator would be hidden at on most boxes. Coldspaces |
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Post by jhigdon2 on Feb 12, 2014 7:49:37 GMT
FEA is flooded evap with cap tube. An oil separator or a oil leg of some sort is an interesting thought. Im wondering how a dry evap would work like Allen mentioned. At first though I would think it would have much less flywheel affect, and have short off cycles, but who knows? It's worth a try.
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Post by coldspaces on Feb 12, 2014 16:11:51 GMT
Here ya go, how about piping in a 2 gallon oil reservoir? Bit large I know,but could maybe be scaled down? Thinking one could make a vessel that sets next the compressor and hold the extra oil needed to make the new compressors work with the original flooded evaps. Wouldn't need the separator or regulators, it would just be a holding tank. Might be able to make one from a store bought receiver or accumulator. henrytech.com/Tips/HT-TT6.pdfColdspaces |
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Post by ChrisJ on Feb 12, 2014 16:28:43 GMT
Could you use the original enclosure as a holding tank with the new compressor (in enclosure) mounted in it?
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Post by cablehack on Feb 12, 2014 22:38:20 GMT
The CF on youtube factory filled with R12 could provide clues as to evaporator differences, not that the manual mentions it.
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