Where are filter-driers typically installed in a refrigeration system?

Filter-driers are typically installed on the high side of a refrigeration system, specifically between the receiver and the expansion valve. The function of the filter-drier is crucial for the overall performance and longevity of the refrigeration system.

In this location, the filter-drier serves multiple purposes: it removes any moisture and contaminants from the refrigerant that can cause damage or inefficiencies in the system. This is especially important because moisture can lead to the formation of acids or ice that may obstruct the flow of refrigerant. Additionally, by positioning the filter-drier here, it ensures that the refrigerant entering the expansion valve is clean and dry, which is essential for the proper operation of the expansion process and, consequently, the entire refrigeration cycle.

Other placements for filter-driers, such as on the low-side before the compressor or after the evaporator coil, would not effectively protect the system, as those areas are different stages of the refrigeration cycle where contaminants would do more harm before reaching the expansion valve. Therefore, the placement of the filter-drier on the high-side between the receiver and the expansion valve is the most effective in maintaining the integrity and efficiency of the refrigeration system.