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great writeup, however, there is one important clarification that needs to be made. The fill amount in the system CANNOT be determined by pressure gauges. This is a two phase system where liquid is present in the receiver dryer and a varying amount of liquid can be present at the same pressure. The pressure reading on the gauges is a function of temperature of the refrigerant and nothing else.
If this were a single phase system,i.e. all gas, then the amount of refrigerant could be inferred by pressure.
Hope this helps
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