How does a two-step scroll compressor achieve capacity reduction?

A) The orbiting scroll only completes half-orbits in low-capacity operation.
B) The orbiting scroll turns clockwise for reduced capacity and counterclockwise for full capacity.
C) An internal rotating plate opens and closes two drilled ports in the scroll.
D) Only one scroll is used during low-capacity operation, while both are used for full-capacity operation.


C

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