Patent ID: 8287230

Claim:
A controller for a system having at least one variable-capacity, pulse-width modulated compressor and at least one fixed-capacity compressor, said controller comprising: processing circuitry operable to modulate the at least one variable-capacity, pulse-width modulated compressor to any capacity substantially between ten percent capacity and one hundred percent capacity, said processing circuitry determining a desired capacity of the at least one variable capacity, pulse-width modulated compressor based on a load sensor signal and a current run percentage of the at least one variable capacity, pulse-width modulated compressor and operable to toggle the at least one fixed-capacity compressor between a run mode and a shutdown mode based on said desired capacity of the at least one variable-capacity, pulse-width modulated compressor, said processing circuitry toggling the at least one fixed-capacity compressor into the run mode when the desired capacity of the at least one variable-capacity, pulse-width modulated compressor is at one hundred percent capacity for a first predetermined time.