What might indicate that a compressor is receiving liquid refrigerant?

The presence of frost developing in the suction line is a strong indicator that a compressor is receiving liquid refrigerant. In a properly functioning refrigeration system, the compressor should primarily be handling gas refrigerant. However, if liquid refrigerant enters the compressor, it can cool the suction line excessively, leading to condensation and subsequent frost formation. This frost occurs because the temperature of the refrigerant is low enough that it causes moisture in the air around the suction line to freeze.

Other factors may provide clues about compressor performance but do not specifically indicate the presence of liquid refrigerant. High pressure in the compressor might suggest overcharging or other issues but does not directly point to liquid refrigerant intake. Low temperature readings could indicate efficient cooling but, again, do not necessarily correlate with liquid refrigerant in the system. Noise from the compressor can indicate a variety of problems but is not a definitive sign of liquid refrigerant presence either. Thus, the formation of frost is a clear and observable sign that indicates liquid refrigerant is entering the compressor.