A refrigerant system that has been improperly pressure-tested could lead to what type of operational issue?

Improper pressure testing of a refrigerant system can significantly affect its operational performance. When a system is pressure-tested incorrectly, it can lead to high head pressure. This situation arises because the refrigerant may not be able to circulate properly due to blockages, leaks, or improper refrigerant charge.

High head pressure results in the compressor having to work harder to push the refrigerant through the system. This not only reduces the system's efficiency but can also cause increased wear and tear on the compressor, leading to potential system failures and costly repairs. Maintaining the appropriate pressure levels is essential for ensuring the refrigerant can absorb and release heat effectively, which is critical for the system's overall performance.

In contrast, low evaporation rates, increased efficiency, and stability in operation are not typically associated with improper pressure testing and reflect healthier operational characteristics.