EPA Section 608 Universal Certification ExamType I (Small Appliances)Medium
A technician is recovering R-290 (propane) from a small appliance. Which of the following is an essential safety precaution specific to working with flammable refrigerants like R-290?
- AUse non-sparking tools and work in a well-ventilated area.
- BEnsure the recovery cylinder is heated to prevent liquefaction.
- CIncrease the recovery machine's operating pressure to speed up the process.
- DStore the recovered R-290 in a standard gray recovery cylinder.
Show answer & explanationAnswer & explanation
Correct answer: A. Use non-sparking tools and work in a well-ventilated area.
R-290 (propane) is a highly flammable hydrocarbon refrigerant. To prevent ignition, it is essential to use non-sparking tools and ensure adequate ventilation to disperse any potential refrigerant leaks, minimizing the risk of explosion or fire.
Why the other options are wrong
- B. Heating a recovery cylinder for flammable refrigerants is extremely dangerous and risks explosion.
- C. Increasing recovery pressure is not a safety precaution for flammables and could be dangerous.
- D. Flammable refrigerants require specific recovery cylinders (e.g., red band) and cannot be stored in standard gray cylinders.
Flammable Refrigerant Safety
When working with flammable refrigerants like R-290 (propane), essential safety precautions include using non-sparking tools and ensuring the work area is extremely well-ventilated to prevent ignition hazards.
- Hydrocarbon refrigerants are highly flammable.
- Eliminate all ignition sources (sparks, open flames).
- Adequate ventilation is critical to disperse leaked refrigerants below flammability limits.
Memory trick: For flammables, no sparks, and fresh air marks!