Question 149Refrigeration & AC - QMED

The correct answer is B) system leaks on the low side. In a low-pressure refrigeration system, excessive running of the purge recovery unit generally indicates that there are leaks on the low side of the system. The purge recovery unit is designed to remove non-condensable gases, such as air, that can accumulate in the system. If there are leaks on the low side, air can be drawn into the system, causing the purge recovery unit to run more frequently to remove the accumulated non-condensable gases. The other options are incorrect because: A) a faulty purge system vent valve would not cause the purge recovery unit to run excessively, C) system leaks on the high side would not lead to the same issue, and D) an overcharged system would not necessarily cause the purge recovery unit to run excessively.