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Re: Vacuum out AC System----cheap way???
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Posted by Bob on May 05, 2007 at 07:31:43 from (69.178.229.154):
In Reply to: Vacuum out AC System----cheap way??? posted by Leaky Boot on May 05, 2007 at 06:35:27:
I wouldn't even THINK of installing a new unit without thoroughly evacuating it to a deep vacuum to remove any moisture. ANY moisture trapped inside will eventually corrode the system from the inside out. For what a new system co$t$, doing it RIGHT to start out with is worth it. The must be someone near you with a pump who would do it reasonably, or lend you the pump? Also, any air left in the system will degrade performance, and add load to the compressor, and heat to the condensor. Unlike the refrigerant, air does not liquify at the high-side pressures encountered in an A/C system, so you are using power to compress the air, then it simply "spings back" to low-side pressure, without absorbing heat in the process, as the refrigerant does. This adds load to the compressor, wasting power, and heat that must be removed by the condensor, further increasing head pressure and power needed by the compressor. ---Bob (Certified in all classes of mobile and staionary refrigeration)
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