After the refrigerant has been recovered, which of the following can be used to flush the system?

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Multiple Choice

After the refrigerant has been recovered, which of the following can be used to flush the system?

After refrigerant recovery, you want to purge the system of residual refrigerant, air, and moisture. Dry nitrogen is the best choice because it is an inert, dry gas that won’t react with oils or metals inside the system and won’t introduce moisture. This helps displace non-condensables and water, reducing the risk of corrosion or acid formation when you evacuate. Water would add moisture and could cause corrosion and contaminants; compressed air can contain moisture and oils and isn’t a controlled purge medium; refrigerant itself (R-22) would simply reintroduce refrigerant into the system. Nitrogen, being dry and inert, is the appropriate purge gas.

After refrigerant recovery, you want to purge the system of residual refrigerant, air, and moisture. Dry nitrogen is the best choice because it is an inert, dry gas that won’t react with oils or metals inside the system and won’t introduce moisture. This helps displace non-condensables and water, reducing the risk of corrosion or acid formation when you evacuate.

Water would add moisture and could cause corrosion and contaminants; compressed air can contain moisture and oils and isn’t a controlled purge medium; refrigerant itself (R-22) would simply reintroduce refrigerant into the system. Nitrogen, being dry and inert, is the appropriate purge gas.

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