Which of the precautions listed should be taken before opening any part of a refrigeration system for the purpose of accomplishing non-major repairs?

Correct Answer: Option C — Bring the part of the system to be opened to 0 psig.

Before breaking any piping or component containment, systems must be pumped down and equalized to 0 psig (atmospheric pressure) using proper recovery procedures to prevent dangerous refrigerant discharge into the machinery space and comply with EPA and maritime safety standards.