HVAC - EPA Certification Practice Exam

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What might a strong odor during refrigerant recovery indicate?

Normal operation
Compressor burn-out has occurred
Refrigerant is leaking
System is overcharged

The correct answer is: Compressor burn-out has occurred

A strong odor during refrigerant recovery can indicate that a compressor burn-out has occurred. When a compressor fails, it can produce a burnt or smoky smell due to overheating of the internal components. This can release particulates and oil mist into the refrigerant, which also contributes to a distinct odor during recovery. In cases of compressor burn-out, the deterioration of the components can lead to contamination of the refrigerant, indicating that it may no longer be suitable for reuse. This situation necessitates proper handling and disposal procedures to ensure safety and environmental compliance. Recognizing this symptom is critical for technicians, as it signals a need for further investigation and potential repair or replacement of the compressor and related system components.