Ac System Won T Hold Vacuum But Will Hold Pressure

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Answering as an engineer, who has had (almost) 50 years of working on refrigeration system (yes that includes air conditioners) the answer is: #3 · aug 8, 2015. When the system is not running, the high and low side are the same. I'd say you might have a gauge or connector issue.

Since the vapor pressure of moisture can exceed 50,000 microns on a hot day, a “blank off” test on a system with remaining moisture can easily rise beyond the reach of a. I'm hoping someone familiar with ac system could help me. I am currently installing this ac system in my house. After connecting the coolant lines and checking for leaks (soapy water. Couldn't hold vacuum on the low pressure side of ac system but i didn't realize i was supposed to vacuum the high side at the same time. Is it possible the leak was just pulling from the high. But, if it's still in a vacuum or no pressure, dump a little freon into the high side. It might be just enough to get the compressor engaging and pulling freon in on the low side. A positive pressure can push on a seal lip ever so slightly in one direction causing it to leak but when it’s under vacuum it sucks on it in the other direction causing it to seal up.