EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Medium
After a major repair on a high-pressure appliance, a technician must evacuate the system to a certain level. If the system holds 35 pounds of R-407C and the repair is not followed by disposal, what is the required evacuation level?
- A15 inches Hg vacuum
- B0 psig
- C10 inches Hg vacuum
- D25 inches Hg vacuum
Show answer & explanationAnswer & explanation
Correct answer: C. 10 inches Hg vacuum
For high-pressure appliances with a charge of less than 200 pounds of refrigerant, when the appliance is not being disposed of, the required evacuation level is 10 inches Hg vacuum. R-407C is a high-pressure refrigerant.
Why the other options are wrong
- A. 15 inches Hg vacuum is for very high-pressure appliances or high-pressure appliances manufactured before 1993 with 200+ lbs of refrigerant.
- B. 0 psig is for very high-pressure appliances or small high-pressure appliances being disposed of with self-contained recovery.
- D. 25 inches Hg vacuum is for low-pressure appliances.
High-Pressure Appliance Evacuation Levels (Major Repair, Not Disposal)
EPA regulations define specific evacuation levels for high-pressure appliances after major repairs but before recharging, depending on the refrigerant charge size and whether the appliance is being disposed of.
- For high-pressure appliances with <200 lbs of refrigerant, 10 inches Hg vacuum is required when not being disposed of.
- This ensures non-condensables and residual refrigerant are removed.
- Different standards apply for disposal or larger systems.
Memory trick: Post-repair, not disposal, ten inches is the call, for small charges, stand tall.