Batch oil return system and method

A refrigeration system, comprising:

• a compressor, condenser, separator, and evaporator, wherein;
• a condenser inlet is connected to an outlet of the compressor;
• a separator inlet is connected to an outlet of the condenser;
• an evaporator inlet is connected to a first outlet of the separator;
• an evaporator outlet is connected to the separator inlet, wherein the separator is configured to receive vapor and liquid refrigerant from the evaporator outlet and from the condenser via an expansive valve;
• wherein the refrigeration system includes a refrigerant with an oil;
• a control unit having instructions stored thereon for executing an oil batch return sequence comprising the following steps:
• boiling the refrigerant within the evaporator and the separator that leaves the oil in the evaporator and the separator;
• and
• draining the oil from the evaporator and/or separator.