Patent ID: 11874031
Assignee: COPELAND LP
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A system comprising:
a first compressor having a first inlet and a first outlet;
a second compressor being a horizontal sumpless compressor and having a second inlet and a second outlet, the second compressor providing working fluid discharged from the second outlet to the first inlet of the first compressor;
a first evaporator disposed upstream of the second compressor and providing working fluid to the second compressor, the first evaporator and the second compressor being disposed within a first display case;
a second evaporator disposed upstream of the first compressor and providing working fluid to the first compressor, the second evaporator being a medium-temperature evaporator disposed within a second display case that is operated as a refrigerator;
a bypass passageway that extends from a suction line of the second compressor at a location between the first evaporator and the second compressor to a discharge line of the second compressor; and
a bypass valve disposed along the bypass passageway and movable between an open position in which fluid is allowed to flow through the bypass passageway and a closed position in which fluid is restricted from flowing through the bypass passageway;
wherein:
the first evaporator is controlled to operate as a low-temperature evaporator and the first display case is controlled to operate, as a freezer when the bypass valve receives communication controlling the bypass valve to move is to the closed position; and
the first evaporator is controlled to operate as another medium-temperature evaporator and the first display case is controlled to operate as another refrigerator when the bypass valve receives communication controlling the bypass valve to move to the open position and the second compressor is controlled to turn off.