Patent ID: 6928828

Claim:
A refrigerant cycle comprising: at least two compressors, each of said compressors receiving a suction line for delivering refrigerant to be compressed, said suction line receiving refrigerant from a common suction manifold, and each of said compressors having a discharge line for delivering a compressed refrigerant to a downstream discharge common manifold; a first heat exchanger downstream of said discharge manifold, and an economizer heat exchanger downstream of said first heat exchanger, a refrigerant tap tapping a refrigerant line communicating said first heat exchanger to said economizer heat exchanger, and an expansion device on said tap line, upstream of said economizer heat exchanger, an economizer manifold returning said tapped refrigerant downstream of said economizer heat exchanger to each of said compressors, and an economizer return line communicating said economizer manifold to an intermediate compression point in each of said compressors.