EPA Section 608 Universal Certification ExamType III (Low-Pressure Appliances)Easy
A technician is preparing to charge a low-pressure chiller with R-123. Which of the following safety precautions is most critical when handling this refrigerant?
- AEnsuring adequate ventilation to prevent oxygen deprivation.
- BWearing insulated gloves to prevent frostbite.
- CMaintaining a safe distance from the charging cylinder to avoid explosion.
- DUsing a self-contained breathing apparatus due to high toxicity.
Show answer & explanationAnswer & explanation
Correct answer: A. Ensuring adequate ventilation to prevent oxygen deprivation.
R-123 is a low-pressure refrigerant that can displace oxygen in enclosed spaces. Adequate ventilation is crucial to prevent oxygen deprivation (asphyxiation) for technicians working with it.
Why the other options are wrong
- B. While good practice, R-123 is low pressure and typically not cold enough to cause severe frostbite during normal handling.
- C. Refrigerant cylinders are designed to be robust; explosion is not a common risk during normal charging procedures if handled correctly.
- D. R-123 has low toxicity; a SCBA is not typically required unless in extreme, unventilated conditions or during a massive leak.
R-123 Safety (Asphyxiation)
R-123, like many refrigerants, is heavier than air and can displace oxygen in poorly ventilated areas, posing a risk of asphyxiation.
- Low pressure, low toxicity.
- Heavier than air.
- Ventilation is key for safety.
Memory trick: Ventilate well, or your breath won't tell!