AC leak
Sometimes if the AC gauges read no pressure at all, and the shop air compressor tank has been drained of condensate, relative humidity is low, and I'm not seeing water condensate spraying out of my air nozzle or air tools, I will pressurize an AC system with shop air and listen for an air leak rather than rushing an evacuation that won't hold and wasting a partial charge on a system you would be able to hear a hissing sound on something with a larger leak. And if you do recover a partial charges on systems with larger AC leaks the damn recovery machine pulls in air contamination before it reaches -7in hg and automatically shutsoff by it self. I manually shut machine it off at zero psi, wait 5 minutes and might recover again if pressure rises back up over 20 psi
Sometimes if the AC gauges read no pressure at all, and the shop air compressor tank has been drained of condensate, relative humidity is low, and I'm not seeing water condensate spraying out of my air nozzle or air tools, I will pressurize an AC system with shop air and listen for an air leak rather than rushing an evacuation that won't hold and wasting a partial charge on a system you would be able to hear a hissing sound on something with a larger leak. And if you do recover a partial charges on systems with larger AC leaks the damn recovery machine pulls in air contamination before it reaches -7in hg and automatically shutsoff by it self. I manually shut machine it off at zero psi, wait 5 minutes and might recover again if pressure rises back up over 20 psi
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