- AA device with its own compressor
- A device that uses the system's compressor or pressure to aid recovery
- CA device that only works on high-pressure systems
- DA device requiring external power
Correct answer
A device that uses the system's compressor or pressure to aid recovery
Why
System-dependent devices rely on the system's compressor or the pressure difference in the system to recover refrigerant.
The concept behind this question
Recovery technique depends on the appliance and how much refrigerant it holds. The practical distinction is between system-dependent (passive) recovery, which relies on the appliance's own compressor or pressure and is limited to small appliances, and self-contained (active) recovery, which uses a powered recovery machine and is required for larger equipment. Recovery equipment must be certified to the applicable standard, and required evacuation levels vary with appliance size and type.
More questions on this topic
- Why is it important to never mix refrigerants?
- What type of recovery equipment must be used for refrigerants?
- What must recovery equipment be capable of achieving?
- What is the required recovery efficiency for small appliance recovery equipment manufactured after November 15, 1993 when the compressor is operating?
- What is a self-contained recovery device?
- What should be done before recovering refrigerant from a system with a burned-out compressor?
Exam-style practice question. Not an official EPA exam question.