What is a sign of liquid slugging that must be immediately addressed?

A rapid discharge temperature drop is a significant indicator of liquid slugging in a refrigeration system and requires immediate attention. This phenomenon occurs when liquid refrigerant enters the compressor in substantial amounts instead of vapor, leading to a condition known as slugging. When this occurs, the compressor struggles to manage the liquid, which can cause mechanical damage, reduced efficiency, and potential compressor failure. The rapid drop in discharge temperature is a warning sign that liquid is not being processed correctly and that troubleshooting is essential to prevent further complications.

In the context of the other choices, high discharge temperature indicates possible overloading or inadequate cooling, but does not specifically point to liquid slugging. Normal discharge pressure might suggest that the system is operational but does not provide information regarding the state of the refrigerant. Decreased refrigerant flow could signify other issues in the system, but does not directly indicate liquid slugging as clearly as a rapid drop in discharge temperature does. Therefore, recognizing a rapid discharge temperature drop as a direct consequence of liquid slugging is critical for the timely maintenance and safety of refrigeration equipment.