HVAC EPA 608 Refrigerant Certification 5 — Questions and Answers
Question 1: Which refrigerant blend is an azeotrope, meaning it behaves like a single-component refrigerant with no temperature glide?
- R-404A
- R-407C
- R-502
- R-410A (Correct answer)
Correct answer: R-410A
R-410A is a near-azeotropic blend of R-32 and R-125 with minimal temperature glide (less than 0.1°F), behaving essentially like a single-component refrigerant.
Question 2: What does the AIM Act (American Innovation and Manufacturing Act) primarily authorize the EPA to do?
- Ban all HFC refrigerants immediately
- Phase down the production and consumption of HFCs in the United States (Correct answer)
- Require all HVAC technicians to retake EPA 608 certification
- Mandate the use of natural refrigerants in all new equipment
Correct answer: Phase down the production and consumption of HFCs in the United States
The AIM Act authorizes the EPA to phase down U.S. production and consumption of HFCs by 85% from baseline levels by 2036.
Question 3: A technician is working on a centrifugal chiller using R-11. Which EPA 608 certification type is required?
- Type I
- Type II (Correct answer)
- Type III
- Universal
Correct answer: Type II
Type II certification covers high-pressure and very high-pressure appliances, but centrifugal chillers using R-11 operate at low pressure, requiring Type III certification.
Question 4: What condition is indicated when the suction line of an air conditioning system is heavily frosted all the way back to the compressor?
- Overcharge of refrigerant only
- Low refrigerant charge
- Flooded evaporator with liquid returning to the compressor (Correct answer)
- Normal operation in humid conditions
Correct answer: Flooded evaporator with liquid returning to the compressor
Frost extending back to the compressor indicates liquid refrigerant is returning (flooding back), which can cause liquid slugging and compressor damage.
Question 5: Under EPA 608, what must be included on the label of a refrigerant recovery cylinder?
- Only the type of refrigerant recovered
- Refrigerant type, whether it is mixed with other refrigerants, and whether it contains contaminants (Correct answer)
- The technician's EPA certification number only
- The date of recovery and system brand
Correct answer: Refrigerant type, whether it is mixed with other refrigerants, and whether it contains contaminants
Recovery cylinder labels must identify the refrigerant type, disclose if it has been mixed with other refrigerants, and indicate whether it contains contaminants.
Question 6: Which of the following best describes 'refrigerant reclamation' under EPA 608?
- On-site filtering and drying of recovered refrigerant for reuse in the same system
- Reprocessing recovered refrigerant to meet ARI 700 purity standards for resale (Correct answer)
- Venting contaminated refrigerant and replacing with virgin refrigerant
- Transferring refrigerant between recovery cylinders
Correct answer: Reprocessing recovered refrigerant to meet ARI 700 purity standards for resale
Reclamation involves reprocessing recovered refrigerant at an EPA-certified facility to meet ARI Standard 700 purity specifications, allowing it to be resold.
Question 7: What is the recommended action if a technician suspects a refrigerant cylinder has been overfilled beyond 80% of its water capacity?
- Use the cylinder immediately before pressure builds further
- Return it to the supplier without using it (Correct answer)
- Release excess pressure through the relief valve
- Store it in a cool area and monitor pressure
Correct answer: Return it to the supplier without using it
An overfilled cylinder is a serious safety hazard and should be returned to the supplier; never use, heat, or attempt to vent an overfilled refrigerant cylinder.
HVAC EPA 608 Refrigerant Certification 5
Which refrigerant blend is an azeotrope, meaning it behaves like a single-component refrigerant with no temperature glide?