EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Medium
A technician is evacuating a high-pressure appliance that has undergone a major component replacement. The system contains 45 pounds of R-407C. What is the required evacuation level for this system before recharging?
- A15 inches of mercury vacuum
- B0 inches of mercury vacuum
- C10 inches of mercury vacuum
- D25 inches of mercury vacuum
Show answer & explanationAnswer & explanation
Correct answer: C. 10 inches of mercury vacuum
For high-pressure appliances containing more than 10 pounds of refrigerant, after a major repair, the system must be evacuated to 10 inches of mercury vacuum. This ensures sufficient removal of non-condensables and moisture.
Why the other options are wrong
- A. This vacuum level is not a standard EPA requirement for this specific scenario.
- B. 0 inches of mercury vacuum (atmospheric pressure) is not a sufficient vacuum for dehydration or removal of non-condensables.
- D. This vacuum level is not a standard EPA requirement for this specific scenario.
High-Pressure Appliance Evacuation Levels (Major Repair, >10 lbs)
After a major repair on a high-pressure appliance containing more than 10 pounds of refrigerant, the system must be evacuated to a specific vacuum level to ensure proper dehydration and removal of non-condensables.
- Required vacuum level is 10 inches of mercury vacuum.
- Applies to major repairs on high-pressure appliances.
- Applies when the refrigerant charge is greater than 10 lbs.
Memory trick: Ten inches deep, for big repairs, so no moisture creeps!