Which of the following indicates that the condenser or chiller barrel tubes are leaking?

The indication that the condenser or chiller barrel tubes are leaking is represented by continuous excessive moisture in the purge unit. When a leak occurs in these tubes, refrigerant can escape, but it can also allow moisture to enter the system. This moisture accumulation is typically detected by the purge unit, which is designed to remove non-condensable gases and moisture from the refrigerant circuit. High levels of moisture can lead to operational inefficiencies and potential damage to the system, so the continuous presence of excessive moisture in the purge unit is a clear sign that a leak may be present in the condenser or chiller tubing.

Other factors such as high system pressure, frequent compressor cycling, or a low refrigerant charge could indicate various issues within the refrigeration system, but they do not specifically point to leaks in the condenser or chiller barrel tubes as clearly as the moisture in the purge unit does.