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Question:

After refrigerant is recovered from a sealed system, which of the following gas is used to pressurize (for leak checking) or blow debris out of the system?

A Nitrogen gas
Explaination

Nitrogen is a colorless, odorless, non-inflammable, and readily available (economical) gas. It may not cause any acidic formation when reacting with oxygen or moisture (Acids can cause corrosion). CO2 in moisture forms carbonic acid.