EPA 608 Type III actual Test Questions
with correct answers graded a+ for
2026
Where do leaks commonly occur in low pressure systems?
a. Evaporator
b. Condenser
c. Purge unit
d. Gaskets or fittings - d. Gaskets or fittings
Where do leaks commonly occur in open-drive type compressor systems?
a. Evaporator
b. Condenser
c. Shaft seal
d. Cooling tower - c. Shaft seal
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. - b. Air and moisture enter the
refrigeration system because it operates
,in a vacuum
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 - c. When the system rises from 1 mm Hg to a level above 2.5 mm Hg
during vacuum testing
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 - d. Removes the air from the system. High efficiency purge system
will
expel very little refrigerant
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 - d. Takes its suction from the top
of the condenser, removes the air
from the system, and returns the refrigerant to the evaporator
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 - d. All the above
What needs to be done to leak check a low pressure system?
a. Increase the pressure in the system by the use of nitrogen
b. Increase the pressure in the system by the use of oxygen
c. Increase the pressure in the system by the use of controlled hot
water or heater blankets
d. Increase the pressure in the system by the use of boiler hot water - c. Increase the pressure in
the system by the use of controlled hot
water or heater blankets
What are ways you can increase the pressure in the system?
a. controlled hot water
b. heater blankets
with correct answers graded a+ for
2026
Where do leaks commonly occur in low pressure systems?
a. Evaporator
b. Condenser
c. Purge unit
d. Gaskets or fittings - d. Gaskets or fittings
Where do leaks commonly occur in open-drive type compressor systems?
a. Evaporator
b. Condenser
c. Shaft seal
d. Cooling tower - c. Shaft seal
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. - b. Air and moisture enter the
refrigeration system because it operates
,in a vacuum
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 - c. When the system rises from 1 mm Hg to a level above 2.5 mm Hg
during vacuum testing
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 - d. Removes the air from the system. High efficiency purge system
will
expel very little refrigerant
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 - d. Takes its suction from the top
of the condenser, removes the air
from the system, and returns the refrigerant to the evaporator
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 - d. All the above
What needs to be done to leak check a low pressure system?
a. Increase the pressure in the system by the use of nitrogen
b. Increase the pressure in the system by the use of oxygen
c. Increase the pressure in the system by the use of controlled hot
water or heater blankets
d. Increase the pressure in the system by the use of boiler hot water - c. Increase the pressure in
the system by the use of controlled hot
water or heater blankets
What are ways you can increase the pressure in the system?
a. controlled hot water
b. heater blankets
