NCT Refrigerant Management & Environmental Compliance 3 — Questions and Answers
Question 1: Which refrigerant has a Global Warming Potential (GWP) of approximately 1 and is classified as the reference standard?
- R-22
- R-134a
- CO2 (R-744) (Correct answer)
- R-410A
Correct answer: CO2 (R-744)
Carbon dioxide (R-744) has a GWP of exactly 1 and serves as the baseline reference against which all other refrigerants' global warming potentials are measured.
Question 2: When must a technician complete repairs on a leaking appliance with a charge of 50 lbs or more under EPA Section 608?
- Within 14 days of discovery
- Within 30 days of discovery (Correct answer)
- Within 45 days of discovery
- Within 90 days of discovery
Correct answer: Within 30 days of discovery
EPA Section 608 requires that leaks in appliances with 50 lbs or more of refrigerant must be repaired within 30 days of discovering the leak.
Question 3: What information must be recorded in a refrigerant tracking log when adding refrigerant to a system with a full charge of 50 lbs or more?
- Technician's name and EPA certification number only
- Date, technician name, amount added, and refrigerant type (Correct answer)
- Amount added and the brand of refrigerant cylinder used
- Date and the system's operating pressures before and after charge
Correct answer: Date, technician name, amount added, and refrigerant type
EPA Section 608 requires recording the date, servicing technician, type of refrigerant, and amount added for appliances with charges of 50 lbs or more.
Question 4: What is the ODP (Ozone Depletion Potential) of R-134a?
- 0.05
- 1.0
- 0 (Correct answer)
- 0.11
Correct answer: 0
R-134a has an ODP of zero because it contains no chlorine or bromine atoms that could destroy stratospheric ozone.
Question 5: Which type of refrigerant cylinder is PROHIBITED from being refilled under DOT regulations?
- Recovery cylinders
- Returnable cylinders
- Non-refillable disposable cylinders (Correct answer)
- Large DOT-4BW cylinders
Correct answer: Non-refillable disposable cylinders
DOT regulations prohibit refilling non-refillable (disposable) refrigerant cylinders, as they are not designed or tested for repeated pressurization.
Question 6: Under EPA SNAP program, which of the following is an approved substitute for R-22 in residential air conditioning retrofit applications?
- R-410A
- R-407C (Correct answer)
- R-32
- R-290
Correct answer: R-407C
R-407C is an EPA SNAP-approved retrofit substitute for R-22 in residential air conditioning systems, with similar operating pressures.
Question 7: What is the purpose of the 'de minimis' exemption under EPA Section 608 venting prohibitions?
- It allows small amounts of refrigerant to be vented during normal system operation
- It exempts releases that are incidental to repair, not from venting (Correct answer)
- It permits venting of refrigerants with a GWP below 150
- It allows technicians without certification to vent small amounts
Correct answer: It exempts releases that are incidental to repair, not from venting
The de minimis exemption covers refrigerant released as an unavoidable consequence of good-faith repair work, such as small releases when connecting or disconnecting hoses.
NCT Refrigerant Management & Environmental Compliance 3
Which refrigerant has a Global Warming Potential (GWP) of approximately 1 and is classified as the reference standard?