After flushing the lines and coils, the flush should be purged out using which gas?

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Multiple Choice

After flushing the lines and coils, the flush should be purged out using which gas?

Explanation:
Purging after flushing lines and coils is about displacing air and any moisture with a gas that won’t react with the refrigerant or oil. Nitrogen is the best choice because it’s inert and dry, so it won’t cause corrosion, moisture-related problems, or reactions with lubricants or refrigerants. It effectively pushes out air and residual moisture from the system before charging. Using air would bring in moisture and oxygen, which can lead to corrosion and other moisture-related issues, while oxygen promotes oxidation. Helium isn’t necessary for purge and is more costly, and is mainly used for leak testing.

Purging after flushing lines and coils is about displacing air and any moisture with a gas that won’t react with the refrigerant or oil. Nitrogen is the best choice because it’s inert and dry, so it won’t cause corrosion, moisture-related problems, or reactions with lubricants or refrigerants. It effectively pushes out air and residual moisture from the system before charging. Using air would bring in moisture and oxygen, which can lead to corrosion and other moisture-related issues, while oxygen promotes oxidation. Helium isn’t necessary for purge and is more costly, and is mainly used for leak testing.

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