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

Correct Answer: Option B — "2"

Component "2" represents the primary range adjustment screw or nut on the pressure control switch. Rotating this specific fastener alters the main spring tension, directly changing the operating cut-in and cut-out set points for the compressor in accordance with standard marine refrigeration control systems.