When charging liquid should added to which side of the compressor?

When charging a liquid refrigerant into a compressor, it should be added to the low-pressure side, typically through the suction port. This allows the liquid refrigerant to evaporate and absorb heat before it reaches the compressor, preventing damage. Adding liquid refrigerant to the high-pressure side can lead to compressor failure due to liquid slugging. Always follow manufacturer guidelines and safety protocols when charging refrigerants.