What is a consequence of overcharging a refrigeration system?

Overcharging a refrigeration system leads to high compressor suction and discharge pressures. When the system is overcharged, there is an excess of refrigerant which can lead to elevated pressures within the compressor. This occurs because the compressor operates with more refrigerant than it was designed to handle, resulting in an increase in the pressure of the vapor returning to the compressor as well as the pressure of the refrigerant being discharged. These high pressures can cause mechanical stress and inefficiencies within the system, potentially leading to damage or malfunction.

In contrast, the other consequences listed are not accurate in the context of overcharging. Low evaporator temperatures can occur with undercharging or other issues in the system but not with overcharging. Increased refrigerant efficiency is not a valid outcome as overcharging typically reduces efficiency due to the compressor having to work harder and potentially leading to a lack of proper heat exchange. Reduced cooling capacity is directly linked to refrigerant issues but would more commonly be associated with undercharging or other problems rather than overcharging, which often sees the opposite effect where the system struggles to maintain effectiveness under the stress of high pressures.