How should refrigerant be charged into the system?
Refrigerant must be charged in the liquid state, not the gaseous state. If gaseous refrigerant is drawn out first, the composition of the remaining refrigerant will change and become unsuitable for use. When using a cylinder with a siphon, refrigerant is charged in the liquid state without needing to turn it upside down. (Page 14)
From the official Mitsubishi PURY-HP72 Heat Pump manual, page 14
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