EPA 608 HVAC Certification Exam Prep – Practice Questions, Answers &
Detailed Rationales (Updated 2026) | Core + Type I, II & III Coverage,
Refrigerant Types & Properties, Recovery & Recycling Procedures, Leak
Detection & Repair, System Evacuation & Charging, EPA Regulations
(Clean Air Act), Safety & Environmental Practices
Question 1: What is the primary environmental concern associated with
chlorofluorocarbon (CFC) refrigerants?
A. They contribute to acid rain formation
B. They deplete stratospheric ozone through chlorine release
C. They cause immediate respiratory distress in humans
D. They increase ground-level ozone formation
CORRECT ANSWER: B. They deplete stratospheric ozone through chlorine release
Rationale: CFCs are stable compounds that migrate to the stratosphere where
ultraviolet radiation breaks them down, releasing chlorine atoms that catalytically
destroy ozone molecules. This ozone depletion allows more harmful UV radiation to
reach Earth's surface, increasing risks of skin cancer and ecosystem damage.
www.epa.gov
Question 2: Under EPA Section 608 regulations, which action is explicitly prohibited
when servicing refrigeration equipment?
A. Using recovery equipment certified by an EPA-approved organization
B. Intentionally venting ozone-depleting refrigerants during maintenance
C. Keeping records of refrigerant purchases for three years
D. Installing access valves on small appliances
CORRECT ANSWER: B. Intentionally venting ozone-depleting refrigerants during
maintenance
Rationale: The Clean Air Act prohibits the knowing release or venting of ozone-
depleting refrigerants (CFCs, HCFCs) and their substitutes (HFCs) during servicing,
maintenance, repair, or disposal of appliances. This prohibition applies regardless of
refrigerant type and is a cornerstone of Section 608 compliance.
www.epa.gov
Question 3: Which refrigerant classification has an ozone depletion potential (ODP)
of zero?
A. CFCs
B. HCFCs
C. HFCs
D. Halons
CORRECT ANSWER: C. HFCs
,Rationale: Hydrofluorocarbons (HFCs) contain no chlorine or bromine atoms, which
are the elements responsible for ozone depletion. Therefore, all HFCs have an ODP of
zero. However, many HFCs have high global warming potentials (GWPs), leading to
ongoing regulatory phase-downs under the AIM Act.
www.epa.gov
Question 4: What is the minimum certification required for a technician to service a
residential split-system air conditioner using R-410A?
A. Type I only
B. Type II only
C. Type III only
D. Universal certification
CORRECT ANSWER: B. Type II only
Rationale: Residential split-system air conditioners are classified as high-pressure
appliances. Type II certification qualifies technicians to service high-pressure
equipment. Since R-410A is an HFC blend used in high-pressure systems, Type II
certification is sufficient; Universal certification includes Types I, II, and III plus Core but
is not the minimum requirement.
www.epa608.com
Question 5: According to EPA regulations, what is the required evacuation level for
a high-pressure appliance containing more than 200 pounds of refrigerant when
using recovery equipment manufactured after November 15, 1993, prior to
disposal?
A. 0 psig
B. 4 inches of mercury vacuum
C. 10 inches of mercury vacuum
D. 15 inches of mercury vacuum
CORRECT ANSWER: B. 4 inches of mercury vacuum
Rationale: For high-pressure appliances containing more than 200 pounds of
refrigerant, EPA regulations require evacuation to 4 inches of mercury vacuum when
using recovery equipment manufactured after November 15, 1993, prior to disposal.
This ensures minimal refrigerant release during equipment retirement.
ww2.epatest.com
Question 6: Which of the following best defines "reclaiming" refrigerant under
Section 608?
A. Removing refrigerant from a system and storing it in an external container
B. Processing recovered refrigerant to meet AHRI Standard 700-2016 specifications
,C. Cleaning refrigerant by oil separation and moisture removal for immediate reuse
D. Transferring refrigerant between systems of the same owner
CORRECT ANSWER: B. Processing recovered refrigerant to meet AHRI Standard
700-2016 specifications
Rationale: Reclaiming means reprocessing refrigerant to the purity level specified in
AHRI Standard 700-2016, which is the industry standard for virgin refrigerant. This
process typically occurs at specialized facilities and allows reclaimed refrigerant to be
sold and used as if it were new. Recovering and recycling are distinct processes with
lower purity requirements.
www.epa.gov
Question 7: What personal protective equipment is essential when handling
refrigerant cylinders to prevent frostbite?
A. Steel-toed boots only
B. Insulated gloves and safety goggles
C. Full-face respirator with organic vapor cartridges
D. Flame-resistant coveralls
CORRECT ANSWER: B. Insulated gloves and safety goggles
Rationale: Refrigerants can cause severe frostbite upon skin contact due to rapid
evaporation and extreme cold temperatures. Insulated gloves protect hands, while
safety goggles shield eyes from liquid refrigerant splashes. Additional PPE may be
required based on specific tasks and refrigerant types.
www.epa.gov
Question 8: Why is nitrogen preferred over compressed air or oxygen for
pressurizing refrigeration systems during leak testing?
A. Nitrogen is less expensive than other gases
B. Nitrogen does not support combustion and prevents oxidation inside the system
C. Nitrogen has a higher pressure rating than air
D. Nitrogen improves refrigerant lubricity
CORRECT ANSWER: B. Nitrogen does not support combustion and prevents
oxidation inside the system
Rationale: Nitrogen is inert, non-flammable, and dry, making it safe for pressurization
testing. Using oxygen or compressed air introduces moisture and oxygen, which can
cause internal corrosion, acid formation, and potential combustion hazards when
mixed with refrigerant oil. Always use a pressure regulator and relief valve with nitrogen
cylinders.
www.epa.gov
, Question 9: What is the maximum allowable fill percentage for a refrigerant
recovery cylinder to ensure safe transportation?
A. 60%
B. 70%
C. 80%
D. 90%
CORRECT ANSWER: C. 80%
Rationale: DOT regulations require recovery cylinders to be filled no more than 80% of
their water capacity to allow for liquid expansion due to temperature increases during
transport. Overfilling can cause catastrophic cylinder failure if pressure exceeds design
limits. Cylinders must also be properly labeled with refrigerant type and DOT
classification.
www.epa.gov
Question 10: Which Montreal Protocol provision directly impacts EPA Section 608
certification requirements?
A. Mandatory use of reclaimed refrigerant in all new equipment
B. Phaseout schedule for production of ozone-depleting substances
C. Requirement for universal certification for all HVAC technicians
D. Ban on all hydrocarbon refrigerants
CORRECT ANSWER: B. Phaseout schedule for production of ozone-depleting
substances
Rationale: The Montreal Protocol is an international treaty that established phaseout
schedules for ozone-depleting substances including CFCs and HCFCs. EPA Section 608
regulations implement these obligations in the United States by requiring technician
certification, recovery practices, and venting prohibitions to minimize refrigerant
emissions during the phaseout transition.
www.epa.gov
Question 11: What is the primary purpose of a purge unit on a low-pressure
centrifugal chiller?
A. To increase system cooling capacity
B. To remove non-condensable gases and moisture that accumulate in the condenser
C. To automatically recharge refrigerant when levels drop
D. To filter compressor oil contaminants
CORRECT ANSWER: B. To remove non-condensable gases and moisture that
accumulate in the condenser
Rationale: Low-pressure chillers operate below atmospheric pressure, allowing air and
moisture to leak into the system. The purge unit automatically removes these non-
Detailed Rationales (Updated 2026) | Core + Type I, II & III Coverage,
Refrigerant Types & Properties, Recovery & Recycling Procedures, Leak
Detection & Repair, System Evacuation & Charging, EPA Regulations
(Clean Air Act), Safety & Environmental Practices
Question 1: What is the primary environmental concern associated with
chlorofluorocarbon (CFC) refrigerants?
A. They contribute to acid rain formation
B. They deplete stratospheric ozone through chlorine release
C. They cause immediate respiratory distress in humans
D. They increase ground-level ozone formation
CORRECT ANSWER: B. They deplete stratospheric ozone through chlorine release
Rationale: CFCs are stable compounds that migrate to the stratosphere where
ultraviolet radiation breaks them down, releasing chlorine atoms that catalytically
destroy ozone molecules. This ozone depletion allows more harmful UV radiation to
reach Earth's surface, increasing risks of skin cancer and ecosystem damage.
www.epa.gov
Question 2: Under EPA Section 608 regulations, which action is explicitly prohibited
when servicing refrigeration equipment?
A. Using recovery equipment certified by an EPA-approved organization
B. Intentionally venting ozone-depleting refrigerants during maintenance
C. Keeping records of refrigerant purchases for three years
D. Installing access valves on small appliances
CORRECT ANSWER: B. Intentionally venting ozone-depleting refrigerants during
maintenance
Rationale: The Clean Air Act prohibits the knowing release or venting of ozone-
depleting refrigerants (CFCs, HCFCs) and their substitutes (HFCs) during servicing,
maintenance, repair, or disposal of appliances. This prohibition applies regardless of
refrigerant type and is a cornerstone of Section 608 compliance.
www.epa.gov
Question 3: Which refrigerant classification has an ozone depletion potential (ODP)
of zero?
A. CFCs
B. HCFCs
C. HFCs
D. Halons
CORRECT ANSWER: C. HFCs
,Rationale: Hydrofluorocarbons (HFCs) contain no chlorine or bromine atoms, which
are the elements responsible for ozone depletion. Therefore, all HFCs have an ODP of
zero. However, many HFCs have high global warming potentials (GWPs), leading to
ongoing regulatory phase-downs under the AIM Act.
www.epa.gov
Question 4: What is the minimum certification required for a technician to service a
residential split-system air conditioner using R-410A?
A. Type I only
B. Type II only
C. Type III only
D. Universal certification
CORRECT ANSWER: B. Type II only
Rationale: Residential split-system air conditioners are classified as high-pressure
appliances. Type II certification qualifies technicians to service high-pressure
equipment. Since R-410A is an HFC blend used in high-pressure systems, Type II
certification is sufficient; Universal certification includes Types I, II, and III plus Core but
is not the minimum requirement.
www.epa608.com
Question 5: According to EPA regulations, what is the required evacuation level for
a high-pressure appliance containing more than 200 pounds of refrigerant when
using recovery equipment manufactured after November 15, 1993, prior to
disposal?
A. 0 psig
B. 4 inches of mercury vacuum
C. 10 inches of mercury vacuum
D. 15 inches of mercury vacuum
CORRECT ANSWER: B. 4 inches of mercury vacuum
Rationale: For high-pressure appliances containing more than 200 pounds of
refrigerant, EPA regulations require evacuation to 4 inches of mercury vacuum when
using recovery equipment manufactured after November 15, 1993, prior to disposal.
This ensures minimal refrigerant release during equipment retirement.
ww2.epatest.com
Question 6: Which of the following best defines "reclaiming" refrigerant under
Section 608?
A. Removing refrigerant from a system and storing it in an external container
B. Processing recovered refrigerant to meet AHRI Standard 700-2016 specifications
,C. Cleaning refrigerant by oil separation and moisture removal for immediate reuse
D. Transferring refrigerant between systems of the same owner
CORRECT ANSWER: B. Processing recovered refrigerant to meet AHRI Standard
700-2016 specifications
Rationale: Reclaiming means reprocessing refrigerant to the purity level specified in
AHRI Standard 700-2016, which is the industry standard for virgin refrigerant. This
process typically occurs at specialized facilities and allows reclaimed refrigerant to be
sold and used as if it were new. Recovering and recycling are distinct processes with
lower purity requirements.
www.epa.gov
Question 7: What personal protective equipment is essential when handling
refrigerant cylinders to prevent frostbite?
A. Steel-toed boots only
B. Insulated gloves and safety goggles
C. Full-face respirator with organic vapor cartridges
D. Flame-resistant coveralls
CORRECT ANSWER: B. Insulated gloves and safety goggles
Rationale: Refrigerants can cause severe frostbite upon skin contact due to rapid
evaporation and extreme cold temperatures. Insulated gloves protect hands, while
safety goggles shield eyes from liquid refrigerant splashes. Additional PPE may be
required based on specific tasks and refrigerant types.
www.epa.gov
Question 8: Why is nitrogen preferred over compressed air or oxygen for
pressurizing refrigeration systems during leak testing?
A. Nitrogen is less expensive than other gases
B. Nitrogen does not support combustion and prevents oxidation inside the system
C. Nitrogen has a higher pressure rating than air
D. Nitrogen improves refrigerant lubricity
CORRECT ANSWER: B. Nitrogen does not support combustion and prevents
oxidation inside the system
Rationale: Nitrogen is inert, non-flammable, and dry, making it safe for pressurization
testing. Using oxygen or compressed air introduces moisture and oxygen, which can
cause internal corrosion, acid formation, and potential combustion hazards when
mixed with refrigerant oil. Always use a pressure regulator and relief valve with nitrogen
cylinders.
www.epa.gov
, Question 9: What is the maximum allowable fill percentage for a refrigerant
recovery cylinder to ensure safe transportation?
A. 60%
B. 70%
C. 80%
D. 90%
CORRECT ANSWER: C. 80%
Rationale: DOT regulations require recovery cylinders to be filled no more than 80% of
their water capacity to allow for liquid expansion due to temperature increases during
transport. Overfilling can cause catastrophic cylinder failure if pressure exceeds design
limits. Cylinders must also be properly labeled with refrigerant type and DOT
classification.
www.epa.gov
Question 10: Which Montreal Protocol provision directly impacts EPA Section 608
certification requirements?
A. Mandatory use of reclaimed refrigerant in all new equipment
B. Phaseout schedule for production of ozone-depleting substances
C. Requirement for universal certification for all HVAC technicians
D. Ban on all hydrocarbon refrigerants
CORRECT ANSWER: B. Phaseout schedule for production of ozone-depleting
substances
Rationale: The Montreal Protocol is an international treaty that established phaseout
schedules for ozone-depleting substances including CFCs and HCFCs. EPA Section 608
regulations implement these obligations in the United States by requiring technician
certification, recovery practices, and venting prohibitions to minimize refrigerant
emissions during the phaseout transition.
www.epa.gov
Question 11: What is the primary purpose of a purge unit on a low-pressure
centrifugal chiller?
A. To increase system cooling capacity
B. To remove non-condensable gases and moisture that accumulate in the condenser
C. To automatically recharge refrigerant when levels drop
D. To filter compressor oil contaminants
CORRECT ANSWER: B. To remove non-condensable gases and moisture that
accumulate in the condenser
Rationale: Low-pressure chillers operate below atmospheric pressure, allowing air and
moisture to leak into the system. The purge unit automatically removes these non-
