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The primary function of the recovery unit's oil separator is to separate oil from refrigerant. In refrigeration and air conditioning systems, lubricating oil is essential for the compressor's operation, as it reduces friction and wear. During the refrigeration cycle, some of this oil may mix with the refrigerant.

The oil separator is designed to ensure that the refrigerant that is being recovered or reclaimed is as pure as possible, which helps maintain system efficiency and prolongs the life of the components. By removing the oil from the refrigerant, it can be processed or returned to the compressor without causing issues related to oil contamination. This separation is crucial for keeping the system's performance optimal and minimizing issues like oil flooding in the evaporator coils, which can lead to reduced efficiency or damage.

While trapping moisture, filtering debris, and cooling refrigerant are important functions in various aspects of HVAC systems, they do not pertain to the specific role of the oil separator in a recovery unit.