What reading indicates proper refrigerant charge when using superheat and subcooling as indicators?

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The reading that indicates proper refrigerant charge is when the superheat is at its target value and the subcooling is within the adequate range. Superheat tells you how much vapor remains after the evaporator, ensuring the compressor doesn’t take in liquid, while subcooling shows how much liquid refrigerant is present before the expansion device, ensuring full condensation and preventing flash gas. When both readings align with their recommended targets under the current operating conditions, the system has the right amount of refrigerant for that load, so the charge is considered correct. If both readings are high or both are low, or if they conflict (high superheat with high subcooling), you don’t have a reliable indication of proper charge.