What is the primary purpose of a receiver-drier in an A/C system?

The primary purpose of a receiver-drier in an A/C system is to remove moisture from the refrigerant. Moisture in the refrigerant can lead to various problems, including corrosion, reduced efficiency, and the formation of ice within the system. The receiver-drier contains desiccant materials that absorb any moisture present, ensuring that the refrigerant remains dry and performs optimally. Additionally, the receiver-drier also serves to store excess refrigerant and can filter impurities, but its key function revolves around moisture removal to maintain the integrity and efficiency of the A/C system.

In contrast, while options like cooling the refrigerant, controlling refrigerant flow, and increasing pressure can be functions associated with other components in the A/C system, they do not accurately describe the primary role of the receiver-drier.