EPA 608 Type III Test Questions Actual 2026 Newest
Updated Questions and Correct Answers (Latest
Update) (Verified Answers by Expert)
Question 1
Where do leaks commonly occur in low-pressure systems?
A. Evaporator
B. Condenser
C. Purge unit
D. Gaskets or fittings
Correct Answer: D. Gaskets or fittings
Rationale: Low-pressure refrigeration systems commonly develop leaks at
gaskets, fittings, joints, and other connections, where seals can deteriorate or
loosen.
Question 2
Where do leaks commonly occur in open-drive type compressor systems?
A. Evaporator
B. Condenser
C. Shaft seal
D. Cooling tower
,Correct Answer: C. Shaft seal
Rationale: Open-drive compressors have a rotating shaft that passes through the
compressor housing, making the shaft seal a common location for refrigerant
leakage.
Question 3
Does refrigerant go out of the system in low-pressure systems or does air and
moisture go in?
A. Refrigerant escapes through low-pressure leaks.
B. Air and moisture enter the refrigeration system because it operates in a vacuum.
C. Refrigerant leaks out through shaft seals and gaskets.
Correct Answer: B. Air and moisture enter the refrigeration system because it
operates in a vacuum.
Rationale: A low-pressure refrigeration system can operate below atmospheric
pressure. Therefore, when a leak occurs, atmospheric air and moisture are drawn
into the system rather than refrigerant escaping.
Question 4
When should a low-pressure system be leak checked according to ASHRAE
Guideline 3-1996?
A. There are specific recommendations.
B. During pressure checks
C. When the system rises from 1 mm Hg to a level above 2.5 mm Hg during
vacuum testing
D. Leak check every year
,Correct Answer: C. When the system rises from 1 mm Hg to a level above 2.5
mm Hg during vacuum testing
Rationale: A rise in system pressure above the specified 2.5 mm Hg level during
vacuum testing indicates possible leakage or inadequate evacuation, requiring the
system to be leak checked.
Question 5
What does a purge unit do and what is a high-efficiency purge unit?
A. Removes the refrigerant from the system. High-efficiency purge system will
expel large quantities of refrigerant.
B. Removes the refrigerant from the system. High-efficiency purge system will
expel very little refrigerant.
C. Removes the oil from the system. High-efficiency purge system will expel very
little refrigerant.
D. Removes the air from the system. High-efficiency purge system will expel very
little refrigerant.
Correct Answer: D. Removes the air from the system. High-efficiency purge
system will expel very little refrigerant.
Rationale: A purge unit removes non-condensable gases such as air from a
refrigeration system. A high-efficiency purge unit separates the non-condensables
from the refrigerant, minimizing refrigerant loss.
Question 6
How does a centrifugal compressor purge unit work?
, A. Takes its suction from the top of the evaporator, removes the air from the
system, and returns the refrigerant to the evaporator.
B. Takes its suction from the top of the chiller barrel, removes the air from the
system, and returns the refrigerant to the evaporator.
C. Takes its suction from the top of the compressor suction, removes the air from
the system, and returns the refrigerant to the evaporator.
D. Takes its suction from the top of the condenser, removes the air from the
system, and returns the refrigerant to the evaporator.
Correct Answer: D. Takes its suction from the top of the condenser, removes
the air from the system, and returns the refrigerant to the evaporator.
Rationale: In centrifugal refrigeration systems, air and other non-condensables
accumulate in the condenser, so the purge unit draws from the top of the
condenser, removes the air, and returns recovered refrigerant to the evaporator.
Question 7
What are visible ways to check for leaks in a low-pressure system?
A. Excessive running of a purge system.
B. Continuous excessive moisture in the purge unit could indicate a leak in the
condenser or the chiller barrel.
C. High head pressure
D. All the above
Correct Answer: D. All the above
Rationale: Excessive purge operation, continuous moisture in the purge unit, and
high head pressure can all be indicators of air or refrigerant leakage in a low-
pressure system.
Updated Questions and Correct Answers (Latest
Update) (Verified Answers by Expert)
Question 1
Where do leaks commonly occur in low-pressure systems?
A. Evaporator
B. Condenser
C. Purge unit
D. Gaskets or fittings
Correct Answer: D. Gaskets or fittings
Rationale: Low-pressure refrigeration systems commonly develop leaks at
gaskets, fittings, joints, and other connections, where seals can deteriorate or
loosen.
Question 2
Where do leaks commonly occur in open-drive type compressor systems?
A. Evaporator
B. Condenser
C. Shaft seal
D. Cooling tower
,Correct Answer: C. Shaft seal
Rationale: Open-drive compressors have a rotating shaft that passes through the
compressor housing, making the shaft seal a common location for refrigerant
leakage.
Question 3
Does refrigerant go out of the system in low-pressure systems or does air and
moisture go in?
A. Refrigerant escapes through low-pressure leaks.
B. Air and moisture enter the refrigeration system because it operates in a vacuum.
C. Refrigerant leaks out through shaft seals and gaskets.
Correct Answer: B. Air and moisture enter the refrigeration system because it
operates in a vacuum.
Rationale: A low-pressure refrigeration system can operate below atmospheric
pressure. Therefore, when a leak occurs, atmospheric air and moisture are drawn
into the system rather than refrigerant escaping.
Question 4
When should a low-pressure system be leak checked according to ASHRAE
Guideline 3-1996?
A. There are specific recommendations.
B. During pressure checks
C. When the system rises from 1 mm Hg to a level above 2.5 mm Hg during
vacuum testing
D. Leak check every year
,Correct Answer: C. When the system rises from 1 mm Hg to a level above 2.5
mm Hg during vacuum testing
Rationale: A rise in system pressure above the specified 2.5 mm Hg level during
vacuum testing indicates possible leakage or inadequate evacuation, requiring the
system to be leak checked.
Question 5
What does a purge unit do and what is a high-efficiency purge unit?
A. Removes the refrigerant from the system. High-efficiency purge system will
expel large quantities of refrigerant.
B. Removes the refrigerant from the system. High-efficiency purge system will
expel very little refrigerant.
C. Removes the oil from the system. High-efficiency purge system will expel very
little refrigerant.
D. Removes the air from the system. High-efficiency purge system will expel very
little refrigerant.
Correct Answer: D. Removes the air from the system. High-efficiency purge
system will expel very little refrigerant.
Rationale: A purge unit removes non-condensable gases such as air from a
refrigeration system. A high-efficiency purge unit separates the non-condensables
from the refrigerant, minimizing refrigerant loss.
Question 6
How does a centrifugal compressor purge unit work?
, A. Takes its suction from the top of the evaporator, removes the air from the
system, and returns the refrigerant to the evaporator.
B. Takes its suction from the top of the chiller barrel, removes the air from the
system, and returns the refrigerant to the evaporator.
C. Takes its suction from the top of the compressor suction, removes the air from
the system, and returns the refrigerant to the evaporator.
D. Takes its suction from the top of the condenser, removes the air from the
system, and returns the refrigerant to the evaporator.
Correct Answer: D. Takes its suction from the top of the condenser, removes
the air from the system, and returns the refrigerant to the evaporator.
Rationale: In centrifugal refrigeration systems, air and other non-condensables
accumulate in the condenser, so the purge unit draws from the top of the
condenser, removes the air, and returns recovered refrigerant to the evaporator.
Question 7
What are visible ways to check for leaks in a low-pressure system?
A. Excessive running of a purge system.
B. Continuous excessive moisture in the purge unit could indicate a leak in the
condenser or the chiller barrel.
C. High head pressure
D. All the above
Correct Answer: D. All the above
Rationale: Excessive purge operation, continuous moisture in the purge unit, and
high head pressure can all be indicators of air or refrigerant leakage in a low-
pressure system.
