If the combination moisture indicator and sight glass indicates an accumulation of moisture within the system, which of the listed procedures would be the most practical to follow?

Correct Answer: Option C — Close the king valve, pump down the system, isolate the drier, remove the desiccant core and replace with new drier cartridge.

A color change in the moisture indicator sight glass signals desiccant saturation. Standard marine maintenance dictates pumping down the system via the king valve, isolating the drier assembly, and replacing the exhausted core with a fresh desiccant cartridge.