EPA SECTION 608 TYPE III
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS(VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What type of appliances are covered under EPA Section 608 Type III
certification?
A. Small appliances
B. High-pressure appliances
C. Low-pressure appliances
D. Motor vehicle A/C systems
Rationale: Type III certification applies specifically to low-pressure
appliances such as chillers.
2. Low-pressure appliances typically operate at pressures:
A. Above atmospheric pressure
B. At or below atmospheric pressure
C. Above 150 psig
D. Above 300 psig
Rationale: Low-pressure appliances operate in a vacuum or near
atmospheric pressure.
3. Which refrigerant is commonly used in low-pressure chillers?
A. R-410A
B. R-134a
C. R-11
D. R-404A
Rationale: R-11 is a traditional low-pressure refrigerant used in
centrifugal chillers.
,4. What is the primary environmental concern with low-pressure refrigerants?
A. Toxicity
B. Ozone depletion
C. Flammability
D. Corrosion
Rationale: Many low-pressure refrigerants are CFCs with high ozone
depletion potential.
5. What device is used to prevent air and moisture from entering a low-
pressure system?
A. Expansion valve
B. Purge unit
C. Receiver
D. Accumulator
Rationale: Purge units remove air and non-condensables from low-
pressure systems.
6. When should refrigerant be recovered from a low-pressure appliance?
A. Only during disposal
B. Only when contaminated
C. Before opening the system for service
D. Never
Rationale: EPA regulations require recovery before servicing to prevent
emissions.
7. What is the required recovery level for low-pressure appliances when using
recovery equipment manufactured after November 15, 1993?
A. 0 inches Hg
B. 10 inches Hg
C. 25 mm Hg absolute
D. 4 inches Hg
Rationale: EPA specifies 25 mm Hg absolute for newer recovery
equipment.
8. What is the primary cause of air infiltration in low-pressure systems?
A. Overcharging
B. Operating in a vacuum
, C. High condenser pressure
D. Oil migration
Rationale: Vacuum operation allows air to leak into the system.
9. Which component typically leaks air into a low-pressure system?
A. Liquid line
B. Discharge valve
C. Shaft seals and gaskets
D. Sight glass
Rationale: Shaft seals and gaskets are common leak points.
10.What happens if air accumulates in a low-pressure chiller?
A. Increased efficiency
B. Reduced efficiency and higher operating costs
C. Lower condenser pressure
D. Increased refrigerant flow
Rationale: Non-condensables reduce heat transfer efficiency.
11.What safety concern is associated with low-pressure refrigerants like R-11?
A. Flammability
B. Corrosiveness
C. Toxicity at high concentrations
D. Reactivity with oil
Rationale: Some low-pressure refrigerants can be toxic if leaked in
confined spaces.
12.What device is used to detect leaks in low-pressure systems?
A. Bubble solution only
B. Flame detector
C. Ultrasonic or electronic leak detector
D. Pressure gauge
Rationale: Electronic and ultrasonic detectors are effective for low-
pressure systems.
13.Why is nitrogen often used during leak testing?
A. It reacts with refrigerant
B. It is inert and dry
C. It increases pressure permanently
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS(VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What type of appliances are covered under EPA Section 608 Type III
certification?
A. Small appliances
B. High-pressure appliances
C. Low-pressure appliances
D. Motor vehicle A/C systems
Rationale: Type III certification applies specifically to low-pressure
appliances such as chillers.
2. Low-pressure appliances typically operate at pressures:
A. Above atmospheric pressure
B. At or below atmospheric pressure
C. Above 150 psig
D. Above 300 psig
Rationale: Low-pressure appliances operate in a vacuum or near
atmospheric pressure.
3. Which refrigerant is commonly used in low-pressure chillers?
A. R-410A
B. R-134a
C. R-11
D. R-404A
Rationale: R-11 is a traditional low-pressure refrigerant used in
centrifugal chillers.
,4. What is the primary environmental concern with low-pressure refrigerants?
A. Toxicity
B. Ozone depletion
C. Flammability
D. Corrosion
Rationale: Many low-pressure refrigerants are CFCs with high ozone
depletion potential.
5. What device is used to prevent air and moisture from entering a low-
pressure system?
A. Expansion valve
B. Purge unit
C. Receiver
D. Accumulator
Rationale: Purge units remove air and non-condensables from low-
pressure systems.
6. When should refrigerant be recovered from a low-pressure appliance?
A. Only during disposal
B. Only when contaminated
C. Before opening the system for service
D. Never
Rationale: EPA regulations require recovery before servicing to prevent
emissions.
7. What is the required recovery level for low-pressure appliances when using
recovery equipment manufactured after November 15, 1993?
A. 0 inches Hg
B. 10 inches Hg
C. 25 mm Hg absolute
D. 4 inches Hg
Rationale: EPA specifies 25 mm Hg absolute for newer recovery
equipment.
8. What is the primary cause of air infiltration in low-pressure systems?
A. Overcharging
B. Operating in a vacuum
, C. High condenser pressure
D. Oil migration
Rationale: Vacuum operation allows air to leak into the system.
9. Which component typically leaks air into a low-pressure system?
A. Liquid line
B. Discharge valve
C. Shaft seals and gaskets
D. Sight glass
Rationale: Shaft seals and gaskets are common leak points.
10.What happens if air accumulates in a low-pressure chiller?
A. Increased efficiency
B. Reduced efficiency and higher operating costs
C. Lower condenser pressure
D. Increased refrigerant flow
Rationale: Non-condensables reduce heat transfer efficiency.
11.What safety concern is associated with low-pressure refrigerants like R-11?
A. Flammability
B. Corrosiveness
C. Toxicity at high concentrations
D. Reactivity with oil
Rationale: Some low-pressure refrigerants can be toxic if leaked in
confined spaces.
12.What device is used to detect leaks in low-pressure systems?
A. Bubble solution only
B. Flame detector
C. Ultrasonic or electronic leak detector
D. Pressure gauge
Rationale: Electronic and ultrasonic detectors are effective for low-
pressure systems.
13.Why is nitrogen often used during leak testing?
A. It reacts with refrigerant
B. It is inert and dry
C. It increases pressure permanently
