What is the primary function of a filter drier?

A filter drier is a crucial component in a refrigeration system, and its primary function is to enhance the overall reliability and efficiency of the system. The correct answer highlights the fact that a filter drier serves multiple purposes: it removes moisture, particles, and acids from the refrigerant.

Moisture can lead to the formation of acids and ice within the system, which can cause significant damage to components such as the compressor. The presence of particles can also obstruct flow and lead to wear and tear on various system components. By effectively capturing these contaminants, the filter drier helps to maintain the purity of the refrigerant, ensuring optimal performance and extending the lifespan of the refrigeration system.

While moisture removal is an essential function, it is not the sole purpose of a filter drier, which is why options that focus only on moisture do not capture the full scope of the filter drier's role. Similarly, a filter drier does not boost refrigerant pressure or directly improve thermal efficiency, although it indirectly contributes to the system's overall performance by keeping it clean and free from harmful contaminants.