What is the recommended process if unknown refrigerant is encountered during retrofit?

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When you encounter an unknown refrigerant during retrofit, the proper approach is to recover the refrigerant and identify what it is, then follow all applicable regulations. Venting the unknown refrigerant is not acceptable—it's illegal and dangerous because the substance could be ozone-depleting or have high global warming potential, and releasing it harms the environment.

First, isolate the system and use certified recovery equipment to remove the refrigerant into a properly labeled recovery cylinder. Do not mix it with other refrigerants. After recovery, determine the refrigerant’s identity using markings, cylinder labels, manufacturer data, or certified testing if needed. Then handle it according to regulations—reclaim for reuse if possible, or dispose of it through approved facilities in compliance with the law. This ensures environmental protection and regulatory compliance during retrofit.