Patent ID: 8661846
Filing Date: 2014-03-04
Classification: F25B

Abstract:
1. A refrigerant system comprising: a compressor, said compressor delivering refrigerant to a condenser, a tap line downstream of said condenser tapping a refrigerant from a main refrigerant flow line, said main refrigerant flow line passing through an economizer heat exchanger, said main refrigerant flow line passing from said economizer heat exchanger to an expansion device, and to an evaporator, and, then returning through a suction line back to said compressor, said tapped refrigerant selectively passing through said economizer heat exchanger, and into an economizer injection line to be returned to an intermediate compression point of said compressor through a connector line connecting the injection line to said intermediate compression point, and including an economizer shut-off device, said economizer device selectively allowing or blocking flow of said tapped refrigerant to said compressor; a partially compressed fluid from said intermediate compression point of said compressor being selectively communicated through said connector line and then through an unloader line to said suction line by an unloader valve placed on said unloader line; a restriction placed on said economizer injection line at a location such that refrigerant passing through said unloader line does not pass through said restriction but said tapped refrigerant returned to said intermediate compression point will pass through said restriction; and said restriction being placed downstream of said economizer shut-off device.