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Answer :
Final answer:
The gas that would cause the least damage to the environment when leak-checking a unit that has lost a complete charge is dry nitrogen.
Explanation:
The gas that would cause the LEAST damage to the environment when leak-checking a unit that has lost a complete charge is dry nitrogen. Dry nitrogen is an inert gas that does not contribute to ozone depletion or global warming. It is also non-toxic and non-flammable, making it a safe choice for leak-checking.
In contrast, the other options mentioned involve harmful gases. R-22 and R-134a are both refrigerants that are known to contribute to ozone depletion, and R-12 is a chlorofluorocarbon (CFC) that is also harmful to the environment. Compressed air can contain impurities or moisture that could contaminate the unit being leak-checked.
Learn more about Environmental impact of leak-checking gases here:
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