Which device can remove small amounts of moisture from a refrigeration system?

The filter dryer is specifically designed to remove small amounts of moisture from a refrigeration system. Moisture can be detrimental in refrigeration systems, as it can lead to corrosion, freezing of refrigerants, and reduced efficiency of the system. The filter dryer combines the functions of filtration and moisture removal; it contains desiccant materials that absorb moisture and also filters out contaminants from the refrigerant.

In contrast, other devices serve different purposes. A strainer primarily filters out large debris and contaminants but does not address moisture. An expansion device regulates the flow of refrigerant, but it does not remove moisture. An accumulator is used to manage excess refrigerant in the system and help prevent liquid refrigerant from returning to the compressor, but it does not serve a function related to moisture removal either. Therefore, the filter dryer is the most appropriate choice for removing small amounts of moisture from a refrigeration system.