Refrigerant system with suction line restrictor for capacity correction

A refrigerant system comprising:

• a compressor compressing refrigerant and delivering the refrigerant through a discharge line to a condenser, an expansion device recieving refrigerant from said condenser, and an evaporator downstream of said expansion device, a suction line communicating said evaporator back to said compressor;
• a fixed restriction downstream of said evaporator and upstream of the compression chambers in said compressor, the size of the restriction selected to achieve a desired capacity for the compressor;
• and
• wherein an economizer heat exchanger is placed between said main expansion device and said condenser, and a tapped flow of refrigerant passes through said economizer heat exchanger, and said tapped flow of refrigerant being returned to said compressor to allow selective control of the performance of the refrigerant system.

A refrigerant system comprising:

• a compressor compressing refrigerant and delivering the refrigerant through a discharge line to a condenser, an expansion device recieving refrigerant from said condenser, and an evaporator downstream of said expansion device, a suction line communicating said evaporator back to said compressor;
• a fixed restriction downstream of said evaporator and upstream of the compression chambers in said compressor, the size of the restriction selected to achieve a desired capacity for the compressor;
• and
• wherein an unloader line selectively communicates intermediate compression chambers of said compressor back to said suction line, an unloader valve is placed in said unloader line, and said unloader valve is opened to reduce capacity provided by the refrigerant system.

A method of operating a refrigerant system comprising:

• providing a compressor compressing refrigerant and delivering the refrigerant through a discharge line to a condenser, an expansion device receiving refrigerant from said condenser, and an evaporator downstream of said expansion device, a suction line communicating said evaporator back to said compressor;
• providing a fixed restriction downstream of said evaporator and upstream of the compression chambers in said compressor, the size of the fixed restriction selected to achieve a desired capacity for the compressor;
• and
• wherein said suction line includes two branches, with at least one of said branches including a fixed restriction, and another of said branches including a selectively opened valve, said selectively opened valve being opened to provide additional capacity as desired, and closed when a reduced capacity is desired.

A method of operating a refrigerant system comprising:

• providing a compressor compressing refrigerant and delivering the refrigerant through a discharge line to a condenser, an expansion device receiving refrigerant from said condenser, and an evaporator downstream of said expansion device, a suction line communicating said evaporator back to said compressor;
• providing a fixed restriction downstream of said evaporator and upstream of the compression chambers in said compressor, the size of the fixed restriction selected to achieve a desired capacity for the compressor;
• and
• wherein said fixed restriction is placed in a suction line leading to said compressor.

A method of operating a refrigerant system comprising:

• providing a compressor compressing refrigerant and delivering the refrigerant through a discharge line to a condenser, an expansion device receiving refrigerant from said condenser, and an evaporator downstream of said expansion device, a suction line communicating said evaporator back to said compressor;
• providing a fixed restriction downstream of said evaporator and upstream of the compression chambers in said compressor, the size of the fixed restriction selected to achieve a desired capacity for the compressor;
• and
• wherein an economizer heat exchanger is placed between said main expansion device and said condenser, and a tapped flow of refrigerant passes through said economizer heat exchanger, and said tapped flow of refrigerant being returned to said compressor to allow selective control of the performance of the refrigerant system.

A method of operating a refrigerant system comprising:

• providing a compressor compressing refrigerant and delivering the refrigerant through a discharge line to a condenser, an expansion device receiving refrigerant from said condenser, and an evaporator downstream of said expansion device, a suction line communicating said evaporator back to said compressor;
• providing a fixed restriction downstream of said evaporator and upstream of the compression chambers in said compressor, the size of the fixed restriction selected to achieve a desired capacity for the compressor;
• and
• an unloader line selectively communicates intermediate compression chambers of said compressor back to said suction line, an unloader valve is placed in said unloader line, and said unloader valve is opened to reduce capacity provided by the refrigerant system.