EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Hard
Which of the following refrigerants is classified as a 'very high-pressure' refrigerant under EPA Section 608 regulations?
- AR-744
- BR-407C
- CR-22
- DR-134a
Show answer & explanationAnswer & explanation
Correct answer: A. R-744
R-744 is the chemical designation for Carbon Dioxide (CO2), which operates at significantly higher pressures than typical HVAC/R refrigerants. It is classified as a 'very high-pressure' refrigerant under EPA Section 608 regulations due to its critical temperature and operating pressures.
Why the other options are wrong
- B. R-407C is a high-pressure refrigerant, but not 'very high-pressure'.
- C. R-22 is a high-pressure refrigerant, but not 'very high-pressure'.
- D. R-134a is a high-pressure refrigerant, but not 'very high-pressure'.
Very High-Pressure Refrigerant
A refrigerant classified by EPA Section 608 as operating at extremely high pressures, typically above 300 psig at 104°F (40°C), requiring specialized handling and equipment.
- Examples include R-744 (CO2).
- Requires specific recovery and safety protocols due to high pressures.
- Different from high-pressure, low-pressure, or very low-pressure classifications.
- Characterized by high critical temperatures and operating points.
Memory trick: CO2, so high, it touches the sky!