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Re: R-134a substitutes (automotive AC)
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Posted by Bob on March 10, 2004 at 10:42:14 from (66.163.134.177):
In Reply to: R-134a substitutes (automotive AC) posted by Mike (WA) on March 10, 2004 at 08:13:13:
As far as operation, Freeze 12 is a drop-in replacement for R-12 and works great without the need to change oil and flush the system. I have heard some rumors that there may be a time it becomes unavailable due to environmental concerns, but at least for now it is available, and works just fine. Any such refrigerant that is a blend of differant refrigerants may suffer from a lessening of system performance over time, because the "most leaky" components of the blend will sneak out of the system first, leaving the lower boiling-point components. This is not a problem with most ag equipment systems, because, like it or not, over the period of a year, all the refrigerant will probably leak out in the off season, when the machine is not being used, and be replaced with a fresh charge the next spring. Be sure there is adequate oil charge remaining before recharging, and pull a vaccuum on the system to remove non-condensibles, which degrade cooling performance, and make the compressor work harder.
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