Fundamentals of Refrigeration Practice Test

The purpose of a filter drier in a refrigeration system is to remove moisture and contaminants from the refrigerant. Moisture is detrimental to refrigeration systems as it can lead to the formation of acid and sludge, which can cause corrosion and reduce the efficiency of components such as the compressor, expansion device, and evaporator. By installing a filter drier, the system is protected against these harmful elements, ensuring the refrigerant remains clean and dry, thus maintaining optimal performance and extending the lifespan of the components.

Filter driers employ materials that absorb moisture and may contain filtration media to capture solid impurities, providing a dual function of moisture control and filtration. This is crucial for reliable operation and maintaining the system's efficiency.