Patent ID: 6884042
Filing Date: 2005-04-26
Classification: F04C

Abstract:
1. A scroll compressor comprising: a first scroll member having a base and a generally spiral wrap extending from said base, and a second scroll member having a base and a generally spiral wrap extending from said base, said wraps of said first and second scroll members interfitting to define compression chambers, and said second scroll member being driven to orbit relative to said first scroll member to compress a refrigerant entrapped in said compression chambers; and a capacity control which is self-modulating based upon refrigerant conditions, said capacity control including two distinct valves with a first valve and a second valve, said second valve moving to a low capacity condition when a pressure differential between a more compressed refrigerant and a less compressed refrigerant is below a first predetermined amount, and said first valves moving to a low capacity condition when a suction pressure is above a second predetermined amount such that low capacity operation only occurs when said pressure differential is below said first predetermined amount and said suction pressure is above said second predetermined amount.