Question 50Refrigeration & AC - 1st Asst/Chief

The correct answer is B) when release is considered 'de minimis'. The Clean Air Act regulations allow for the release of refrigerant to the atmosphere under certain "de minimis" conditions, where the amount released is considered small and insignificant. This is in contrast to options A, C, and D, which would generally require the refrigerant to be properly recovered and recycled to prevent emissions. The other options are incorrect because: A) testing with R-12 and nitrogen requires proper refrigerant recovery procedures, C) adding oil to a compressor should not result in refrigerant release, and D) compressor replacement also necessitates refrigerant recovery before the work can be performed.