Patent ID: 8397531

Claim:
An apparatus comprising: a compressor ( 22 ) having a suction port ( 46 ), a discharge port ( 48 ), and an economizer port ( 44 ); a condenser ( 24 ) downstream of the discharge port; an evaporator ( 28 ) upstream of the suction port; an expansion device ( 30 ) between the condenser and the evaporator; and an economizer ( 40 ) between the condenser and the evaporator, an economizer line ( 42 ) extending from the economizer to the economizer port, wherein: a resonator ( 60 ) is located in the economizer line and has a first branch ( 66 ) and a second branch ( 68 ), a first flowpath length across the resonator through the second branch being longer than a second flowpath length across the resonator through the first branch.