EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Medium
A technician is performing a recovery from a high-pressure appliance containing R-410A. Which of the following refrigerants is classified as a 'very high-pressure' refrigerant under EPA regulations, requiring a different set of handling procedures?
- AR-22
- BR-404A
- CR-744 (CO2)
- DR-134a
Show answer & explanationAnswer & explanation
Correct answer: C. R-744 (CO2)
R-744 (carbon dioxide) is classified as a 'very high-pressure' refrigerant by the EPA due to its extremely high operating pressures. This classification necessitates specialized recovery equipment and handling procedures that differ from those used for standard high-pressure refrigerants like R-410A, R-134a, R-22, and R-404A.
Why the other options are wrong
- A. R-22 is a high-pressure refrigerant, not 'very high-pressure'.
- B. R-404A is a high-pressure refrigerant, not 'very high-pressure'.
- D. R-134a is a high-pressure refrigerant, but not 'very high-pressure'.
Very High-Pressure Refrigerant
Refrigerants with significantly higher operating pressures than typical high-pressure refrigerants, requiring specialized equipment and safety protocols.
- R-744 (CO2) is the primary example of a 'very high-pressure' refrigerant.
- Requires equipment rated for extremely high pressures.
- Recovery and handling procedures are distinct from high-pressure refrigerants.
- Safety considerations are heightened due to explosive potential at high pressures.
Memory trick: CO2 is SO high, it's VERY high-pressure.