What would be a major consequence of the refrigeration system for a low-pressure CO2 fixed fire extinguishing system remaining inoperable?

Correct Answer: Option D — The entire charge might eventually be lost due to CO2 venting out through the relief valve.

If the refrigeration unit on a low-pressure CO2 tank fails completely, ambient heat warms the liquid carbon dioxide, causing pressure to rise until safety relief valves open and vent the entire extinguishing charge.