R-22 is generally considered to be a safe, nontoxic, nonflammable, and nonexplosive refrigerant. It can, however, become highly toxic under what conditions?
• Chemical behavior of R-22 (refrigerant) when exposed to high heat • Formation of toxic decomposition products when refrigerants are burned or exposed to flame • Difference between normal operating temperatures and conditions that cause chemical breakdown
• Under which of these choices is R-22 most likely to chemically decompose rather than just change temperature or state? • Is R-22 simply being heated, or is something happening that can actually change its chemical structure and form poisonous gases? • Which option describes a situation commonly warned about in safety manuals for refrigerants and brazing/welding work?
• Identify which condition involves actual combustion or flame contact, not just high temperature. • Think about standard HVAC and marine refrigeration safety warnings regarding welding, brazing, or open flames near refrigerant. • Eliminate any answer where R-22 is only changing phase (liquid to gas) but not undergoing chemical breakdown.
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