EPA 608 HVAC Certification 2026/2027 Study Guide
| EPA Section 608 Certification Exam Prep | HVAC
Refrigerant Certification Practice Questions &
Answers, Universal, Type I, Type II & Type III
Review, Recovery & Recycling, Refrigerant
Handling, EPA Regulations, Ozone Protection &
Detailed Rationales
Question 1: What is the primary environmental purpose of the EPA Section 608
certification program?
A. To improve the energy efficiency of HVAC systems
B. To regulate the handling of refrigerants and reduce ozone depletion and climate
change
C. To ensure HVAC technicians are trained in electrical safety
D. To set standards for HVAC system manufacturing
CORRECT ANSWER: B. To regulate the handling of refrigerants and reduce
ozone depletion and climate change
Rationale: Section 608 of the Clean Air Act mandates that technicians who service,
repair, or dispose of appliances containing refrigerants must be certified. The program's
primary environmental goal is to minimize the release of ozone-depleting substances
(ODS) and high-global warming potential (GWP) refrigerants into the atmosphere .
Question 2: Which class of refrigerants has the highest Ozone Depletion
Potential (ODP)?
A. Hydrofluorocarbons (HFCs)
B. Hydrochlorofluorocarbons (HCFCs)
C. Chlorofluorocarbons (CFCs)
D. Hydrofluoroolefins (HFOs)
CORRECT ANSWER: C. Chlorofluorocarbons (CFCs)
Rationale: Chlorofluorocarbons (CFCs), such as R-12 and R-11, contain chlorine and are
highly stable, allowing them to reach the stratosphere where they release chlorine atoms
that catalytically destroy ozone . They are assigned the highest ODP, with R-12 having
an ODP of 1.0, serving as the reference point .
Question 3: What is the maximum allowable refrigerant charge for an
appliance to be classified as a "small appliance" under EPA regulations?
A. 2 pounds
B. 5 pounds
C. 10 pounds
D. 15 pounds
CORRECT ANSWER: B. 5 pounds
,Rationale: Under EPA Section 608 regulations, a small appliance is defined as a factory-
charged, hermetically sealed appliance that contains 5 pounds or less of refrigerant .
This classification determines the specific certification type and recovery requirements a
technician must follow.
Question 4: What does the "A" in the ASHRAE Standard 34 refrigerant safety
classification represent?
A. The refrigerant is non-flammable
B. The refrigerant has lower toxicity
C. The refrigerant has higher toxicity
D. The refrigerant is mildly flammable
CORRECT ANSWER: B. The refrigerant has lower toxicity
Rationale: ASHRAE Standard 34 classifies refrigerants by both toxicity and flammability.
The "A" safety classification signifies lower toxicity (with an occupational exposure limit
of 400 ppm or greater), and the "B" classification denotes higher toxicity . This is
combined with a number (e.g., 1, 2, 2L, 3) to indicate flammability.
Question 5: What is the standard color of the low-side (compound) gauge on a
refrigerant manifold gauge set?
A. Red
B. Yellow
C. Blue
D. Green
CORRECT ANSWER: C. Blue
Rationale: The blue gauge on a manifold set is used to measure the low-side (suction)
pressure of a refrigeration system. The red gauge measures the high-side (discharge)
pressure, and the yellow hose is for the center service port, used for recovery,
evacuation, and charging .
Question 6: What is the primary purpose of a purge unit on a low-pressure
chiller?
A. To increase the system's cooling capacity
B. To reduce the operating pressure of the chiller
C. To remove non-condensable gases like air and moisture from the system
D. To recover refrigerant for recycling
CORRECT ANSWER: C. To remove non-condensable gases like air and
moisture from the system
Rationale: Low-pressure chillers operate below atmospheric pressure, making them
susceptible to leaks that allow air and moisture to enter. A purge unit continuously
removes these non-condensable gases and moisture to maintain system efficiency,
prevent corrosion, and protect the compressor .
,Question 7: Which of the following refrigerants is an HFC and has an Ozone
Depletion Potential of zero?
A. R-12
B. R-22
C. R-134a
D. R-11
CORRECT ANSWER: C. R-134a
Rationale: R-134a is a Hydrofluorocarbon (HFC), meaning its molecular structure does
not contain chlorine. The lack of chlorine atoms means it does not contribute to
stratospheric ozone depletion . In contrast, R-12 and R-11 are CFCs, while R-22 is an
HCFC, all of which contain chlorine and have positive ODPs.
Question 8: What is the maximum allowable fill capacity for a refrigerant
recovery cylinder to allow for safe thermal expansion?
A. 60% of its water capacity
B. 70% of its water capacity
C. 80% of its water capacity
D. 90% of its water capacity
CORRECT ANSWER: C. 80% of its water capacity
Rationale: A recovery cylinder must not be overfilled beyond 80% of its internal volume
to prevent a hydraulic rupture from thermal expansion. Leaving a 20% vapor space
allows the refrigerant to expand safely as the temperature increases .
Question 9: What is the definition of "recovery" in the context of Section 608
refrigerant management?
A. Processing refrigerant to meet virgin purity standards
B. Cleaning refrigerant on-site for immediate reuse in the same system
C. Removing refrigerant from a system and storing it in an external container
D. Destroying refrigerant through high-temperature incineration
CORRECT ANSWER: C. Removing refrigerant from a system and storing it in
an external container
Rationale: Recovery is the act of removing the refrigerant charge from a system and
placing it into an approved external container. "Recycling" refers to cleaning the
refrigerant on-site, while "reclaiming" is the process of processing used refrigerant to
meet ARI 700 purity specifications, which must be done by a certified reclaimer .
Question 10: Under Section 608, at what annual leak rate must commercial
refrigeration systems containing more than 50 pounds of refrigerant be
repaired?
A. 10%
B. 15%
, C. 20%
D. 35%
CORRECT ANSWER: C. 20%
Rationale: The EPA requires that commercial refrigeration equipment with a charge of
50 lbs or more must be repaired if the annual leak rate exceeds 20% of the full charge.
The leak rate triggers are different for other applications: 15% for comfort cooling and
35% for industrial process refrigeration .
Question 11: What is the Ozone Depletion Potential (ODP) of CFC-12 (R-12),
which is used as the baseline for the ODP scale?
A. 0.0
B. 0.055
C. 0.5
D. 1.0
CORRECT ANSWER: D. 1.0
Rationale: CFC-12 is assigned an Ozone Depletion Potential of exactly 1.0, serving as
the reference point against which all other ozone-depleting substances are measured.
For example, HCFC-22 has an ODP of approximately 0.055 .
Question 12: What is the required evacuation level for a high-pressure
appliance containing more than 200 pounds of R-22 when using recovery
equipment manufactured before November 15, 1993?
A. 0 inches of Hg vacuum
B. 4 inches of Hg vacuum
C. 10 inches of Hg vacuum
D. 15 inches of Hg vacuum
CORRECT ANSWER: C. 10 inches of Hg vacuum
Rationale: The required evacuation levels depend on the type of appliance and the date
of manufacture of the recovery equipment. For high-pressure appliances containing
more than 200 pounds of refrigerant (like R-22), equipment manufactured before
November 15, 1993, must achieve 10 inches of Hg vacuum .
Question 13: What is the primary purpose of a filter-drier in a refrigeration
system?
A. To increase the velocity of the refrigerant flow
B. To add refrigerant to the system
C. To remove moisture and contaminants from the refrigerant
D. To raise the condensing pressure
CORRECT ANSWER: C. To remove moisture and contaminants from the
refrigerant
| EPA Section 608 Certification Exam Prep | HVAC
Refrigerant Certification Practice Questions &
Answers, Universal, Type I, Type II & Type III
Review, Recovery & Recycling, Refrigerant
Handling, EPA Regulations, Ozone Protection &
Detailed Rationales
Question 1: What is the primary environmental purpose of the EPA Section 608
certification program?
A. To improve the energy efficiency of HVAC systems
B. To regulate the handling of refrigerants and reduce ozone depletion and climate
change
C. To ensure HVAC technicians are trained in electrical safety
D. To set standards for HVAC system manufacturing
CORRECT ANSWER: B. To regulate the handling of refrigerants and reduce
ozone depletion and climate change
Rationale: Section 608 of the Clean Air Act mandates that technicians who service,
repair, or dispose of appliances containing refrigerants must be certified. The program's
primary environmental goal is to minimize the release of ozone-depleting substances
(ODS) and high-global warming potential (GWP) refrigerants into the atmosphere .
Question 2: Which class of refrigerants has the highest Ozone Depletion
Potential (ODP)?
A. Hydrofluorocarbons (HFCs)
B. Hydrochlorofluorocarbons (HCFCs)
C. Chlorofluorocarbons (CFCs)
D. Hydrofluoroolefins (HFOs)
CORRECT ANSWER: C. Chlorofluorocarbons (CFCs)
Rationale: Chlorofluorocarbons (CFCs), such as R-12 and R-11, contain chlorine and are
highly stable, allowing them to reach the stratosphere where they release chlorine atoms
that catalytically destroy ozone . They are assigned the highest ODP, with R-12 having
an ODP of 1.0, serving as the reference point .
Question 3: What is the maximum allowable refrigerant charge for an
appliance to be classified as a "small appliance" under EPA regulations?
A. 2 pounds
B. 5 pounds
C. 10 pounds
D. 15 pounds
CORRECT ANSWER: B. 5 pounds
,Rationale: Under EPA Section 608 regulations, a small appliance is defined as a factory-
charged, hermetically sealed appliance that contains 5 pounds or less of refrigerant .
This classification determines the specific certification type and recovery requirements a
technician must follow.
Question 4: What does the "A" in the ASHRAE Standard 34 refrigerant safety
classification represent?
A. The refrigerant is non-flammable
B. The refrigerant has lower toxicity
C. The refrigerant has higher toxicity
D. The refrigerant is mildly flammable
CORRECT ANSWER: B. The refrigerant has lower toxicity
Rationale: ASHRAE Standard 34 classifies refrigerants by both toxicity and flammability.
The "A" safety classification signifies lower toxicity (with an occupational exposure limit
of 400 ppm or greater), and the "B" classification denotes higher toxicity . This is
combined with a number (e.g., 1, 2, 2L, 3) to indicate flammability.
Question 5: What is the standard color of the low-side (compound) gauge on a
refrigerant manifold gauge set?
A. Red
B. Yellow
C. Blue
D. Green
CORRECT ANSWER: C. Blue
Rationale: The blue gauge on a manifold set is used to measure the low-side (suction)
pressure of a refrigeration system. The red gauge measures the high-side (discharge)
pressure, and the yellow hose is for the center service port, used for recovery,
evacuation, and charging .
Question 6: What is the primary purpose of a purge unit on a low-pressure
chiller?
A. To increase the system's cooling capacity
B. To reduce the operating pressure of the chiller
C. To remove non-condensable gases like air and moisture from the system
D. To recover refrigerant for recycling
CORRECT ANSWER: C. To remove non-condensable gases like air and
moisture from the system
Rationale: Low-pressure chillers operate below atmospheric pressure, making them
susceptible to leaks that allow air and moisture to enter. A purge unit continuously
removes these non-condensable gases and moisture to maintain system efficiency,
prevent corrosion, and protect the compressor .
,Question 7: Which of the following refrigerants is an HFC and has an Ozone
Depletion Potential of zero?
A. R-12
B. R-22
C. R-134a
D. R-11
CORRECT ANSWER: C. R-134a
Rationale: R-134a is a Hydrofluorocarbon (HFC), meaning its molecular structure does
not contain chlorine. The lack of chlorine atoms means it does not contribute to
stratospheric ozone depletion . In contrast, R-12 and R-11 are CFCs, while R-22 is an
HCFC, all of which contain chlorine and have positive ODPs.
Question 8: What is the maximum allowable fill capacity for a refrigerant
recovery cylinder to allow for safe thermal expansion?
A. 60% of its water capacity
B. 70% of its water capacity
C. 80% of its water capacity
D. 90% of its water capacity
CORRECT ANSWER: C. 80% of its water capacity
Rationale: A recovery cylinder must not be overfilled beyond 80% of its internal volume
to prevent a hydraulic rupture from thermal expansion. Leaving a 20% vapor space
allows the refrigerant to expand safely as the temperature increases .
Question 9: What is the definition of "recovery" in the context of Section 608
refrigerant management?
A. Processing refrigerant to meet virgin purity standards
B. Cleaning refrigerant on-site for immediate reuse in the same system
C. Removing refrigerant from a system and storing it in an external container
D. Destroying refrigerant through high-temperature incineration
CORRECT ANSWER: C. Removing refrigerant from a system and storing it in
an external container
Rationale: Recovery is the act of removing the refrigerant charge from a system and
placing it into an approved external container. "Recycling" refers to cleaning the
refrigerant on-site, while "reclaiming" is the process of processing used refrigerant to
meet ARI 700 purity specifications, which must be done by a certified reclaimer .
Question 10: Under Section 608, at what annual leak rate must commercial
refrigeration systems containing more than 50 pounds of refrigerant be
repaired?
A. 10%
B. 15%
, C. 20%
D. 35%
CORRECT ANSWER: C. 20%
Rationale: The EPA requires that commercial refrigeration equipment with a charge of
50 lbs or more must be repaired if the annual leak rate exceeds 20% of the full charge.
The leak rate triggers are different for other applications: 15% for comfort cooling and
35% for industrial process refrigeration .
Question 11: What is the Ozone Depletion Potential (ODP) of CFC-12 (R-12),
which is used as the baseline for the ODP scale?
A. 0.0
B. 0.055
C. 0.5
D. 1.0
CORRECT ANSWER: D. 1.0
Rationale: CFC-12 is assigned an Ozone Depletion Potential of exactly 1.0, serving as
the reference point against which all other ozone-depleting substances are measured.
For example, HCFC-22 has an ODP of approximately 0.055 .
Question 12: What is the required evacuation level for a high-pressure
appliance containing more than 200 pounds of R-22 when using recovery
equipment manufactured before November 15, 1993?
A. 0 inches of Hg vacuum
B. 4 inches of Hg vacuum
C. 10 inches of Hg vacuum
D. 15 inches of Hg vacuum
CORRECT ANSWER: C. 10 inches of Hg vacuum
Rationale: The required evacuation levels depend on the type of appliance and the date
of manufacture of the recovery equipment. For high-pressure appliances containing
more than 200 pounds of refrigerant (like R-22), equipment manufactured before
November 15, 1993, must achieve 10 inches of Hg vacuum .
Question 13: What is the primary purpose of a filter-drier in a refrigeration
system?
A. To increase the velocity of the refrigerant flow
B. To add refrigerant to the system
C. To remove moisture and contaminants from the refrigerant
D. To raise the condensing pressure
CORRECT ANSWER: C. To remove moisture and contaminants from the
refrigerant
