What is the primary purpose of a filter drier in a refrigeration system?

The primary purpose of a filter drier in a refrigeration system is to remove moisture and contaminants. In a refrigeration system, the presence of moisture can lead to the formation of ice, which can obstruct components such as the expansion valve and compressor. Moisture can also cause chemical reactions that may damage the system and decrease its efficiency.

Filter driers contain desiccants that absorb moisture and filters that capture particulate contaminants, ensuring that the refrigerant circulating through the system remains clean and dry. By doing so, they help maintain the integrity of the refrigeration cycle, thus prolonging the lifespan of the components and improving overall operational efficiency. This role is crucial for preventing issues that could lead to system failures or reduced performance, as a clean and dry refrigerant is essential for optimal heat transfer and system reliability.

The other options do not accurately represent the filter drier's main function. Increasing system pressure and enhancing refrigerant flow typically relate to other components within the refrigeration system, while regulating temperature involves a broader range of functions that extend beyond the capabilities of a filter drier.