EPA Section 608 Universal Certification ExamType II (High-Pressure Appliances)Hard
A client notices a strong, pungent odor similar to ammonia near their high-pressure air conditioning system. The system uses an unknown refrigerant. What is the MOST likely refrigerant being used in this system?
- AR-717
- BR-134a
- CR-410A
- DR-22
Show answer & explanationAnswer & explanation
Correct answer: A. R-717
R-717 is the chemical designation for ammonia. Ammonia is known for its strong, pungent, and distinct odor, which is often described as similar to household ammonia. While it is a natural refrigerant, it is toxic and flammable, requiring specific safety precautions.
Why the other options are wrong
- B. R-134a is an HFC refrigerant and typically has a faint, ethereal odor, not pungent or ammonia-like.
- C. R-410A is an HFC blend; it has a very faint, almost odorless characteristic, not a strong pungent smell.
- D. R-22 is an HCFC refrigerant and also has a faint, ethereal odor, not a strong pungent smell.
R-717 (Ammonia) Odor
R-717, or ammonia, is a natural refrigerant characterized by its strong, pungent, and irritating odor, which makes leaks easily detectable.
- Chemical formula is NH₃.
- Distinctive pungent, ammonia-like smell.
- Classified as a high-pressure refrigerant.
- Toxic and flammable, requiring careful handling.
Memory trick: Pungent ammonia, R-717's true aroma!