EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Medium
A technician is performing a major repair on a high-pressure appliance containing R-410A. The system has a charge of 30 pounds. After recovery, what is the required evacuation level before recharging the system?
- A0 psig
- B10 inches Hg vacuum
- C15 inches Hg vacuum
- D25 inches Hg vacuum
Show answer & explanationAnswer & explanation
Correct answer: C. 15 inches Hg vacuum
For high-pressure appliances with a charge of more than 10 pounds, after a major repair, the EPA requires evacuation to 15 inches of mercury vacuum. This ensures thorough removal of non-condensables and moisture.
Why the other options are wrong
- A. 0 psig is atmospheric pressure, not a vacuum level.
- B. 10 inches Hg vacuum is required for high-pressure appliances with 10 pounds or less of refrigerant after a major repair.
- D. 25 inches Hg vacuum is not a standard EPA evacuation level for this specific scenario.
High-Pressure Appliance Evacuation Levels (Major Repair, >10 lbs)
EPA regulations mandate specific vacuum levels for high-pressure appliances after recovery, depending on the refrigerant charge size and type of repair.
- For major repairs on appliances with >10 lbs, 15 inches Hg vacuum is required.
- For major repairs on appliances with <=10 lbs, 10 inches Hg vacuum is required.
- These levels prevent contamination and ensure proper system operation.
Memory trick: Major fix, greater charge, deeper vacuum to discharge!