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discharge gas pressure to power an eductor, the oil is vacuumed from the housing by the
eductor and is discharged into the oil reservoir. Oil and refrigerant are also recovered from the
top of the cooler refrigerant level and are discharged into the guide vane housing. The oil will
drop to the bottom of the guide vane housing and be recovered by the eductor system.
During Light Load Conditions
, the suction gas into the compressor does not have
enough velocity to return oil, which is floating in the cooler back to the compressor. In addition,
the eductor may not have enough power to pull the oil from the guide vane housing back into
the oil reservoir due to extremely low pressure at the guide vanes. Two solenoids, located on
the oil reclaim piping, are operated so that the eductor can pull oil and refrigerant directly from
the cooler and discharge the mixture into the oil reservoir. The oil reclaim solenoids are
operated by an auxiliary contact integral to the guide vane actuator. This switchover of the
solenoids occurs when the guide vanes are opened beyond 30 degrees from the closed
position.