When is the need for recalibration of the slide valve most likely indicated?

The need for recalibration of the slide valve is most likely indicated in over-compression situations. The slide valve in a refrigeration system plays a critical role in managing the flow of refrigerant and ensuring that the compressor operates efficiently. When over-compression occurs, it typically means that the system is experiencing unauthorized high pressures which can interfere with the proper functioning of the slide valve.

Recalibration is essential in this context because it ensures that the slide valve is adjusted to optimal settings that prevent excessive pressure and related issues. This adjustment helps the compressor operate within safe parameters, thus protecting the overall system from damage and maintaining efficiency.

While low lubrication oil levels, high discharge pressure, and inaccurate temperature readings can certainly indicate other issues within the refrigeration system, they do not directly suggest that recalibration of the slide valve is necessary. Instead, these conditions might point to problems that could affect the system's performance but do not specifically relate to the valve's adjustment and calibration requirements.