Where should the suction line filter drier be located?

• A. Downstream of the Expansion Device
• B. Just upstream of the Compressor Inlet
• C. Near the Evaporator Coil
• D. At the Compressor Outlet

Answer: (B)

The suction line filter drier should be located just upstream of the compressor inlet. This placement is critical for ensuring that any contaminants or moisture in the refrigerant are removed before the refrigerant enters the compressor. By filtering the refrigerant at this point, the filter drier helps protect the compressor, which is a vital component in the refrigeration cycle, from potential damage caused by debris or moisture.

Additionally, if contaminants were allowed to pass through to the compressor, they could lead to inefficiencies or failure of the compressor, which would result in system downtime and increased repair costs. Placing the filter drier before the compressor provides the best chance for the compressor to operate efficiently and reliably, maintaining the overall health of the system.

Other incorrect locations, such as downstream of the expansion device or at the compressor outlet, would not serve the same protective purpose, as moisture and debris would have already impacted the system by that point. Near the evaporator coil is also not ideal as it does not address the compressor's need for protection before it processes the refrigerant. Thus, the positioning of the filter drier is strategically designed to enhance the system's longevity and performance.