EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Medium
A technician is performing a major repair on a high-pressure appliance that contains R-407C. The system has 8 pounds of refrigerant. According to EPA regulations, what is the required evacuation level for this system before being returned to service?
- A15 inches of mercury vacuum
- B0 inches of mercury vacuum (0 psig)
- C25 inches of mercury vacuum
- D10 inches of mercury vacuum
Show answer & explanationAnswer & explanation
Correct answer: B. 0 inches of mercury vacuum (0 psig)
For high-pressure appliances containing 10 pounds or less of refrigerant, after a major repair, the system must be evacuated to 0 inches of mercury vacuum (i.e., atmospheric pressure). This is a less stringent requirement than for larger systems.
Why the other options are wrong
- A. This vacuum level is not a standard EPA requirement for this specific scenario.
- C. This vacuum level is not a standard EPA requirement for this specific scenario.
- D. This level is required for high-pressure appliances with more than 10 lbs of refrigerant after a major repair.
High-Pressure Appliance Evacuation Levels (Major Repair, ≤10 lbs)
After a major repair on a high-pressure appliance containing 10 pounds or less of refrigerant, the system must be evacuated to a specific vacuum level before being returned to service.
- Required vacuum level is 0 inches of mercury vacuum (atmospheric pressure).
- Applies to major repairs on high-pressure appliances.
- Applies when the refrigerant charge is 10 lbs or less.
Memory trick: Small charge, no deep dive, just clear the air, and you're alive!