Lubrication system for a compressor

A heating, ventilation, air conditioning, and/or refrigeration (HVAC&R) system, comprising:

• a refrigerant circuit configured to flow a refrigerant therethrough;
• a condenser positioned along the refrigerant circuit and configured to receive the refrigerant from a compressor positioned along the refrigerant circuit;
• a sump configured to direct a lubricant to the compressor positioned along the refrigerant circuit, wherein the sump and the condenser are separate from one another, and wherein the lubricant directed to the compressor and the refrigerant directed through the refrigerant circuit are different fluids;
• an ejector configured to direct the lubricant from the refrigerant circuit to the sump;
• an expansion device positioned along the refrigerant circuit and configured to reduce a pressure of the refrigerant directed through at least a portion of the refrigerant circuit;
• and
• a controller configured to adjust operation of the HVAC&R system between a first mode and a second mode, wherein the controller is configured to instruct the expansion device to adjust to a first position to enable the ejector to direct the lubricant from the refrigerant circuit to the sump at a first target flow rate in the first mode, and wherein the controller is configured to instruct the expansion device to adjust to a second position to enable the ejector to direct the lubricant from the refrigerant circuit to the sump at a second target flow rate in the second mode.