Red Seal Refrigeration and Air Conditioning Mechanic Practice Exam

A filter-drier plays a crucial role in the functioning of a refrigeration system, particularly in ensuring optimal operation and longevity of the system. Its primary function is to remove moisture and contaminants from the refrigerant. Moisture in the refrigerant can lead to several issues, such as acid formation and ice blockage within the system, which can severely damage components like compressors and metering devices.

By absorbing moisture and capturing debris or particulates, the filter-drier protects the integrity of the refrigerant cycle and maintains the efficiency of the system. This is particularly important because clean, dry refrigerant is essential for efficient heat transfer and system performance. In addition, the removal of contaminants helps prevent corrosion and mechanical failure, ultimately extending the life of the equipment.

In contrast, the other options do not reflect the primary purpose of a filter-drier. It does not serve to directly increase refrigerant temperature or provide additional cooling capacity, nor is it designed primarily to enhance noise reduction in the system.