Engine Refrigeration (Supplementary) USCG Question #431 (Set 7)

The set point adjustment of the device shown in the illustration is made by rotating what component? GS-RA-14 Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration.

Official USCG Answer & Rule Citation

Correct Answer: Option A — "2"

Component 2 on the illustrated pressure control device represents the differential or range adjustment nut, which is manually rotated to alter the operating cut-in and cut-out set points for reliable compressor cycling in marine refrigeration plants.

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