When should a suction drier be left in the refrigeration line?

A suction drier is designed to remove moisture and contaminants from the refrigeration system, playing a crucial role in protecting the compressor and maintaining system efficiency. The correct choice regarding when to leave a suction drier in the refrigeration line is based on the importance of monitoring pressure.

Leaving the suction drier in the system until a pressure drop of more than a few psi exists is essential because it indicates a potential blockage or restriction in the refrigerant flow. This pressure drop can signal that the drier is saturated with moisture or contaminants, thereby reducing the overall efficiency of the system. Ensuring that the drier is left in the line allows for continued protection until its condition can be assessed and addressed appropriately.

While maintenance practices regarding when to remove the suction drier can vary, focusing on pressure readings provides a more immediate and relevant indicator of the drier's performance compared to visually inspecting for moisture or considering the status of other components like the compressor or the vacuuming process, which may not directly correlate with the immediate need for the drier's function.