EPA Section 608 Universal Certification ExamType I (Small Appliances)Medium
A technician is replacing the evaporator coil in a small appliance that uses R-410A. Which of the following is a key characteristic of R-410A that influences safe handling procedures?
- AR-410A requires specialized recovery equipment designed for low-pressure refrigerants.
- BR-410A is a hydrocarbon refrigerant and is highly flammable.
- CR-410A operates at significantly higher pressures than R-22.
- DR-410A is a single-component refrigerant and does not fractionate.
Show answer & explanationAnswer & explanation
Correct answer: C. R-410A operates at significantly higher pressures than R-22.
R-410A operates at much higher pressures than many other common refrigerants like R-22. This requires technicians to use tools and equipment specifically rated for these higher pressures to prevent leaks and equipment failure.
Why the other options are wrong
- A. R-410A is a high-pressure refrigerant, so equipment must be rated for high pressure, not low pressure.
- B. R-410A is an HFC, not a hydrocarbon, and is not considered highly flammable.
- D. R-410A is a zeotropic blend, meaning it can fractionate, making it incorrect.
R-410A Pressure Characteristics
R-410A is a high-pressure HFC refrigerant that operates at significantly higher pressures than older refrigerants like R-22, necessitating specialized high-pressure rated tools and equipment.
- Operates at higher pressures (e.g., 50% higher than R-22).
- Requires high-pressure rated gauges, hoses, and recovery equipment.
- Not flammable (unlike hydrocarbons).
- Is a blend, can fractionate if leaked slowly.
Memory trick: 410A: High pressure, high precaution!