When charging liquids should be added to the side of the compressor?

When charging liquids, they should be added to the side of the compressor to ensure proper mixing and prevent slugging. This method allows the liquid refrigerant to vaporize adequately and ensures that it enters the compressor in a gaseous state, reducing the risk of damage. Additionally, adding liquids to the side helps maintain the compressor's efficiency and performance during the charging process. Always follow manufacturer guidelines for specific charging procedures.