When removing the primary refrigerant from a system using water as a secondary refrigerant, it is important to follow which procedure(s) to safeguard the equipment?

Correct Answer: Option A — Insure that the water is drained or continually circulating to avoid freeze-up.

Water used as a secondary refrigerant has a freezing point of 32°F. When removing primary refrigerant, lowering system pressure can freeze the water, causing catastrophic shell-and-tube chiller rupture unless flow or drainage is maintained.