During conversion, what is the purpose of flushing and purge with nitrogen?

During conversion, what is the purpose of flushing and purge with nitrogen?

• A. To cool the system
• B. To replace refrigerant with nitrogen permanently
• C. To lubricate moving parts
• D. To remove contaminants and moisture from the system before evacuation and charging

Answer: (D)

Purging with nitrogen during a conversion is used to remove contaminants and moisture from the refrigerant circuit before evacuation and charging. Nitrogen is dry and inert, so it displaces air, moisture, and any introduced contaminants without reacting with oils or metals. This helps prevent moisture-related problems like acid formation, corrosion, and ice formation that can occur when the system is later vacuumed and charged with the new refrigerant. By flushing out these impurities first, you achieve a cleaner, deeper vacuum and a more reliable refrigerant charge. It’s not intended for cooling, not a permanent replacement for the refrigerant, and it doesn’t lubricate moving parts.

Purging with nitrogen during a conversion is used to remove contaminants and moisture from the refrigerant circuit before evacuation and charging. Nitrogen is dry and inert, so it displaces air, moisture, and any introduced contaminants without reacting with oils or metals. This helps prevent moisture-related problems like acid formation, corrosion, and ice formation that can occur when the system is later vacuumed and charged with the new refrigerant. By flushing out these impurities first, you achieve a cleaner, deeper vacuum and a more reliable refrigerant charge. It’s not intended for cooling, not a permanent replacement for the refrigerant, and it doesn’t lubricate moving parts.