Question 139Refrigeration & AC - Assistant Engineer

The correct answer is B) leaking condenser or chiller tubes. Excessive moisture collected in the purge unit of a low-pressure refrigeration system indicates a leak in the system, most likely in the condenser or chiller tubes. This is because a leak allows air and moisture to be drawn into the system, which will then be collected in the purge unit. The other options are incorrect because they do not directly explain the excessive moisture issue - a low efficiency purge unit or improper refrigerant charging may contribute to the problem, but they do not directly cause the excessive moisture, and a dryer core replacement may address the moisture but does not explain the underlying cause.