Which of the following statements is true about Section 608 applicability to nitrogen refrigerant?

• A. False
• B. Not sure
• C. Both true and false
• D. True

Answer: (D)

Section 608 governs how refrigerants in cooling equipment must be handled, recovered, and vented. Nitrogen gas isn’t a typical refrigerant, so in ordinary HVAC work it isn’t regulated under 608 when used merely as an inert purge, leak-test gas, or pressure source. But if nitrogen is actually used as the refrigerant in a system, it becomes subject to the same 608 rules as any other refrigerant: technicians must be certified to work with it, recovery equipment must be used to remove it rather than vent it, and venting is prohibited. So the statement is true in the sense that Section 608 applies whenever nitrogen functions as the refrigerant, even though nitrogen used for non-refrigerant purposes isn’t covered by those rules.