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Posted by Bob on May 05, 2007 at 17:36:22 from (69.178.229.154):
In Reply to: Re: Vacuum out AC System----cheap way??? posted by Bob on May 05, 2007 at 16:57:58:
Allan, You stated: "Far less "load on the system" than that large charge of non-compressible refrigerant oil floating around in there." The refrigerant oil IS "non-compressible". That is GOOD. The oil does not "compress", so no power is wasted compressing it. The term we need to work with is "condensable". Any air left in the system is "noncondensable", meaning power is used, and unneeded HEAT is generated by COMPRESSING the air, and, since it does not CONDENSE (as the refrigerant does), it "springs back" (expands) WITHOUT absorbing heat, as the refrigerant does, when it expands from a liquid to a gas through the "TXV" or "FOT". From the ARI website: "Air is another contaminant you need to be concerned about because it adversely affects cooling performance. Air is a noncondensable gas and can make a compressor noisy. Evacuating the A/C system with a vacuum pump should pull all of the air and moisture out of the system — assuming the pump is operating correctly, pulls adequate vacuum and is left on long enough to fully evacuate the system." I can't imagine why you would take this stand against "pumping down" a system before charging it, against ALL "conventional wisdom"???
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