Which of the following is NOT an issue when oil goes out into the system beyond the compressors, and past the oil separator?

When discussing the impact of oil in a refrigeration system, it's crucial to understand the functions of oil and the potential issues linked to oil migration beyond the compressors and oil separators.

The first option refers to the "Improved actuation of the automatic valves." In a refrigeration system, oil is necessary for lubrication and sealing functions, but its presence in excess amounts can lead to various operational challenges rather than improvements. If oil were to enhance the actuation of automatic valves, it would suggest a beneficial effect, which does not align with the typical problems associated with oil flowing into areas where it shouldn’t be, such as inside the evaporator or along the piping. Thus, improved actuation is not seen as a concern when oil improperly circulates, making this option correct as it does not reflect an actual issue.

In contrast, moisture contained in the air can cause significant problems when oil is introduced into the system, as it can lead to corrosion and inefficiency. The formation of frost on the evaporator would indicate that the oil is negatively affecting the heat exchange process, leading to a decrease in performance. Lastly, decreased efficiency of the coil would result from the oil coating the heat exchange surfaces, thereby insulating them and impairing their ability to transfer heat. Hence