EPA Section 608 Universal Certification ExamType III (Low-Pressure Appliances)Medium
A technician is decommissioning a low-pressure chiller that contains 150 lbs of R-11. The EPA-mandated recovery level for this appliance, considering its charge size, is:
- A25 inches of Hg vacuum.
- B20 inches of Hg vacuum.
- C10 inches of Hg vacuum.
- D15 inches of Hg vacuum.
Show answer & explanationAnswer & explanation
Correct answer: A. 25 inches of Hg vacuum.
For low-pressure appliances with a charge of 50 lbs or more, the EPA requires evacuation to 25 inches of Hg vacuum. This ensures a substantial amount of refrigerant is recovered, reducing environmental impact.
Why the other options are wrong
- B. 20 inches of Hg vacuum is not a standard EPA recovery level for low-pressure appliances.
- C. 10 inches of Hg vacuum is for appliances with less than 50 lbs charge, and manufactured before 1993.
- D. 15 inches of Hg vacuum is for appliances with less than 50 lbs charge, manufactured in or after 1993.
Low-Pressure Recovery Standard (>=50 lbs)
The EPA-mandated vacuum level for recovering refrigerant from low-pressure appliances with a charge of 50 lbs or more.
- Applies to low-pressure systems (Type III).
- For systems with 50 lbs or more of refrigerant.
- Requires recovery to 25 inches of Hg vacuum.
Memory trick: Fifty pounds or more, twenty-five is the score!