- A80% of the refrigerant
- 90% of the refrigerant OR evacuation to 4 inches Hg vacuum
- C95% of the refrigerant
- D100% of the refrigerant
Correct answer
90% of the refrigerant OR evacuation to 4 inches Hg vacuum
Why
When the compressor is operating, post-11/15/93 recovery equipment must capture 90% of the refrigerant OR achieve a 4-inch Hg vacuum, whichever occurs first. When the compressor is NOT operating, the requirement is 80% recovery or 4 inches Hg vacuum.
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 a self-contained recovery device?
- What is a system-dependent 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.