Two step oil motive eductor system

A chiller assembly, comprising:

• a centrifugal compressor driven by a hermetically sealed induction motor;
• a condenser;
• an evaporator;
• and
• an oil motive eductor system, comprising:
• an oil sump;
• a first eductor comprising a first suction inlet, a first motive inlet configured to receive a first motive fluid from the oil sump, and a first outlet;
• and
• a second eductor comprising a second suction inlet, a second motive inlet configured to receive a second motive fluid comprising a pressurized refrigerant gas from the condenser, and a second outlet,
• wherein the centrifugal compressor, the condenser, and the evaporator are connected in a closed refrigerant loop.

A chiller assembly, comprising:

• a compressor driven by a motor, wherein the compressor comprises a plenum;
• a condenser;
• an evaporator;
• and
• an oil motive eductor system, comprising:
• an oil sump separate from the plenum;
• a first eductor comprising:
• a first suction inlet configured to receive a first oil and refrigerant mixture from the plenum of the compressor;
• a first motive inlet configured to receive a pressurized oil motive fluid from the oil sump;
• and
• a first outlet configured to discharge a first outlet mixture comprising the first oil and refrigerant mixture and the pressurized oil motive fluid to the oil sump;
• and
• a second eductor comprising a second suction inlet, a second motive inlet, and a second outlet,
• wherein the compressor, the condenser, and the evaporator are connected in a closed refrigerant loop.