Patent ID: 7213405

Claim:
A refrigeration system comprising: a dual-piston linear compressor including a first piston disposed in a first cylinder and a second piston opposed to the first piston and disposed in a second cylinder, the first piston divides the first cylinder into a first suction chamber and a first discharge chamber and the second piston divides the second cylinder into a second suction chamber and a second discharge chamber; a first gas flow path through the linear compressor; a second gas flow path through the linear compressor; a controller operable to switch the linear compressor between an economizer cycle and a single stage cycle wherein in the economizer cycle flow of gas is along the first gas flow path and in the single stage cycle flow of gas is along the second gas flow path; at least one discharge control valve coupled to the controller and responsive to control signals from the controller, the discharge control valve operable to direct gas from the first and second discharge chambers to the first gas flow path or the second gas flow path; and at least one suction control valve coupled to the controller and responsive to control signals from the controller, the suction control valve operable to direct gas to the first and second suction chambers along the first gas flow path or the second gas flow path.