What could indicate a need for slide valve calibration?

The indication of a need for slide valve calibration is associated with over-compression. When a refrigeration system operates with a slide valve that is not properly calibrated, it can lead to excessive compression of the refrigerant vapor. Over-compression typically results in higher discharge pressures and temperatures, which can negatively impact the efficiency of the system and potentially cause damage or increased wear on the compressor.

Properly calibrated slide valves are crucial for maintaining the desired pressures and ensuring optimal system performance. When the slide valve operates correctly, it helps manage the flow of refrigerant based on the load requirements, thereby preventing scenarios like over-compression. Recognizing this need for calibration is essential to maintain the reliability and efficiency of refrigeration systems.

In contrast, while excessive vibration, low discharge pressure readings, and increased power consumption can all indicate issues within a refrigeration system, they are not specifically tied to slide valve calibration. These factors could point to other problems, such as mechanical wear, insufficient refrigerant charge, or inefficiencies within the system that require different troubleshooting steps.