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 process is TRUE?
- AThe recovery unit must be capable of handling the high pressure of R-410A, which is similar to R-22.
- BThe recovery unit's maximum working pressure (MAWP) must meet or exceed the maximum pressure of the R-410A system.
- CThe recovery cylinder should be filled to no more than 90% of its capacity by weight to prevent overpressurization.
- DSince R-410A is an HFC, it can be vented to the atmosphere if the system contains less than 5 pounds.
Show answer & explanationAnswer & explanation
Correct answer: B. The recovery unit's maximum working pressure (MAWP) must meet or exceed the maximum pressure of the R-410A system.
The recovery unit's maximum working pressure (MAWP) must be appropriate for the refrigerant being recovered. R-410A operates at significantly higher pressures than many other refrigerants, so selecting a recovery unit with a matching or higher MAWP is crucial for safety and effective recovery.
Why the other options are wrong
- A. R-410A operates at significantly higher pressures than R-22, so this statement is incorrect.
- C. Recovery cylinders should be filled to a maximum of 80% by weight to allow for thermal expansion, not 90%.
- D. Venting any refrigerant, including HFCs, is illegal under EPA Section 608 regulations.
Recovery Unit MAWP
The Maximum Allowable Working Pressure (MAWP) of a recovery unit must be equal to or greater than the maximum pressure of the refrigerant system it is used with.
- Ensures safety during recovery operations, preventing equipment failure.
- High-pressure refrigerants like R-410A require recovery units rated for higher pressures.
- Always check the recovery unit's specifications against the system's refrigerant type.
Memory trick: Match the unit's strength to the refrigerant's might for a safe flight.