When the sightglass has a continuous, full stream of refrigerant going through it, it will look clear (empty). This should happen about 2k RPM and up with the fan on high speed. If you see bubbles in the sightglass add more. Check the suction line temperature and make sure you have no liquid refrigerant returning to the compressor. Too little refrigerant is not good and too much refrigerant is not good.
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