Short answer? It's NOT an option to not evacuate a refrigerant system into a deep vacuum (less than 500 microns) before charging. Your system will not work if the air and moisture are not removed before charging with refrigerant. Longer answer? Air is a non-condensable, meaning that it will not be condensed in the condenser, but rather, it will take up space and cause your system pressures to be too high to properly absorb and reject heat. Moisture in the air will also cause a lot of problems as it reacts with the refrigerant and oil.
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John
"There are no stupid questions, but there are a LOT of inquisitive idiots!"
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