Patent ID: 8276395

Claim:
A refrigerant system comprising: a compressor for compressing a refrigerant and delivering said refrigerant to a downstream condenser, an expansion device positioned downstream of said condenser, an evaporator positioned downstream of said expansion device, and a suction valve positioned on a suction line leading from said evaporator back to said compressor; said compressor being provided with a rapidly cycled unloaded mode where a discharge valve intermediate said compressor and said condenser blocks flow of refrigerant from said compressor to said condenser when the compressor is in said unloaded mode, a bypass line communicating a discharge line from said compressor back to said suction line, said bypass line communicating with said suction line at a position downstream of said suction valve; and a control for closing said suction valve and said discharge valve when said compressor is moved into said unloaded mode, said unloaded mode occurs by opening a third valve, said third valve being on said bypass line, and said third valve allowing refrigerant from said discharge line to flow back to said suction line downstream of said suction valve.