Patent ID: 8122731
Filing Date: 2012-02-28
Classification: B60H,F25B

Abstract:
1. A method of flushing oil from an oil inject circuit of a refrigerant recovery unit, comprising the steps of: determining if a change from a first type of refrigerant oil is needed for a vehicle refrigerant system under service; removing a first bottle containing the first type of refrigerant oil from the oil injection circuit; opening a vacuum solenoid, a high side solenoid and an oil inject solenoid, wherein the solenoids are controlled by a controller; removing the first type of refrigerant oil from the oil inject circuit by applying a vacuum from a vacuum pump for a predetermined period of time; closing the vacuum solenoid, the high side solenoid and the oil inject solenoid; turning the vacuum pump off; and installing a second bottle containing a second type of refrigerant oil to be introduced into the vehicle refrigerant system under service.