Which indication would suggest improper adjustment of a thermal expansion valve?

Low superheat readings are indicative of an improperly adjusted thermal expansion valve (TXV). In a properly functioning system, the TXV ensures that the right amount of refrigerant is metered into the evaporator based on the cooling load. Superheat is the temperature difference between the refrigerant vapor leaving the evaporator and its saturation temperature. A low superheat reading suggests that excessive refrigerant is entering the evaporator, which can lead to liquid refrigerant returning to the compressor. This condition can cause compressor damage and reduced efficiency.

Understanding the concept of superheat is crucial for recognizing the implications of low superheat. It indicates that the evaporator is flooded, which compromises the refrigeration cycle's effectiveness and can lead to operational issues. Addressing the TXV adjustment can help correct this situation, ensuring optimal performance and preventing potential system failures.