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Post by coldspaces on Feb 25, 2014 22:29:19 GMT
Other than the windings and their cotton insulation/wood slates I would think the rest of the materials in our old machines compressors would be metal and not bothered by using POE oil in it. If a compressor motor has been rewound with R-134a compatible windings would there be any reason to not use POE oil? I am thinking it would be not problem. I know we have discussed this some before when I was converting my DR to 134A and decided that it may not be that important to swap to POE oil with the flooded evaporators our machines use causing the oil to float to the top for removal. So far this theory is working on my DR, I have had no trouble with oil return in my DR using the original mineral oil. If a person is going to go to the trouble of having one rewound it would be nice to know if POE oil is a safe option. This talks about it being better with most metals than conventional lubricants,does say zinc could be an issue. docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2143&context=icecThanks in advance for your input. Coldspaces
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Post by birkie on Feb 26, 2014 16:28:55 GMT
Other than the windings and their cotton insulation/wood slates I would think the rest of the materials in our old machines compressors would be metal and not bothered by using POE oil in it. If a compressor motor has been rewound with R-134a compatible windings would there be any reason to not use POE oil? I am thinking it would be not problem. I think it should be fairly similar to fatty acid methyl esters (biodiesel) as far as materials compatibility: www.biodiesel.org/docs/ffs-performace_usage/materials-compatibility.pdf?sfvrsn=4The only other thing I can think of is cleanliness. POE oil (like biodiesel) is a stronger solvent and will scrub a system clean, dislodging any accumulated crud that was untouched by mineral oil. So my gut feeling would be that clogging of the needle valve seat or cap tube (depending on what you're using) could be a secondary risk unless the system is clean to start with.
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Post by coldspaces on Feb 26, 2014 20:09:04 GMT
Other than the windings and their cotton insulation/wood slates I would think the rest of the materials in our old machines compressors would be metal and not bothered by using POE oil in it. If a compressor motor has been rewound with R-134a compatible windings would there be any reason to not use POE oil? I am thinking it would be not problem. I think it should be fairly similar to fatty acid methyl esters (biodiesel) as far as materials compatibility: www.biodiesel.org/docs/ffs-performace_usage/materials-compatibility.pdf?sfvrsn=4The only other thing I can think of is cleanliness. POE oil (like biodiesel) is a stronger solvent and will scrub a system clean, dislodging any accumulated crud that was untouched by mineral oil. So my gut feeling would be that clogging of the needle valve seat or cap tube (depending on what you're using) could be a secondary risk unless the system is clean to start with. Excellent point about the POE cleaning things out, it sure will. It would be best if a small solid core filter drier is installed some way. Hard to do with out it showing if you are keeping the float. Coldspaces
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