Refrigeration & Air Conditioning USCG Question #950 (Set 18)

The fluid used as a source of actuating power against the underside of the unloader power element piston of the refrigeration compressor capacity control mechanism illustrated is obtained from where? Illustration GS-RA-13 Illustration GS-RA-13: the U.S. Coast Guard has not released this illustration.

Official USCG Answer & Rule Citation

Correct Answer: Option B — discharge of the compressor lube oil pump

Hydraulic capacity control mechanisms on multi-cylinder marine refrigeration compressors utilize high-pressure lubricating oil discharged directly from the compressor lube oil pump as the actuating power source for the unloader pistons.

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