EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Medium
A technician is preparing to recover refrigerant from a high-pressure appliance containing R-410A. Which of the following statements about the recovery cylinder is TRUE?
- AThe recovery cylinder must be rated for the maximum working pressure of R-410A.
- BThe recovery cylinder should be filled to no more than 90% of its gross weight.
- CThe recovery cylinder must be color-coded yellow on the top and gray on the body.
- DThe recovery cylinder should be stored in a horizontal position to prevent over-pressurization.
Show answer & explanationAnswer & explanation
Correct answer: A. The recovery cylinder must be rated for the maximum working pressure of R-410A.
Recovery cylinders must be designed and rated to safely contain the specific refrigerant at its maximum possible pressure, including its maximum working pressure, to prevent rupture and ensure safety.
Why the other options are wrong
- B. Recovery cylinders are typically filled to no more than 80% of their net weight capacity, not gross weight, to allow for liquid expansion.
- C. While recovery cylinders have specific color codes, the primary requirement for safety is the pressure rating, not a specific color combination for R-410A.
- D. Recovery cylinders should be stored upright to properly utilize the liquid and vapor valves, and orientation does not prevent over-pressurization if the fill limit is exceeded.
Recovery Cylinder Pressure Rating
Recovery cylinders must be rated to safely contain the maximum pressure of the refrigerant they hold, indicated by their Maximum Allowable Working Pressure (MAWP).
- MAWP must meet or exceed the refrigerant's maximum expected pressure.
- Ensures safety during recovery and storage.
- Different refrigerants require different cylinder ratings.
Memory trick: Pressure Rating is the 'MAX' safety check for recovery.