Which condition is likely to cause high discharge pressure in a refrigeration system?

High discharge pressure in a refrigeration system is often a result of refrigerant overcharge. When the system is overcharged, there is an excessive amount of refrigerant in the system, which can lead to increased pressure in the compressor. This happens because the compressor is forced to work harder to compress the surplus refrigerant, resulting in a rise in discharge pressure.

Maintaining the correct refrigerant charge is critical for the efficient operation of the refrigeration system. An overcharge not only leads to high discharge pressure but can also cause issues like increased energy consumption, reduced system efficiency, and potential damage to the compressor. Proper assessment and adjustments of the refrigerant charge are crucial for the effective management of a refrigeration system's performance.