EPA 608 Type 3 Study Guide Questions | 2026/2027 |
Answers | With Complete Solutions
____________________ indicates air in a low-pressure system
Correct Answers High Head Pressure
____________________ must not be installed in series Correct
Answers Pressure Relief Valves
_____________________ require purge units because they
operate below _____________________. The primary purpose
of a purge unit is to remove ____________________ that leak
into a low-pressure chiller system. The purge unit gets its
suction from a connection on top of the ______________ where
most non-condensables accumulate. After separating the air
from the refrigerant, the purge unit sends the refrigerant back to
the ________________. High head pressure indicates _______
in a low-pressure system and that the purge unit may not be
______________ properly. Excessive running of a purge system
on a low-pressure chiller generally indicates a ____________
system. High-efficiency purge units will discharge a low
percentage of _____________ with the air they remove. Correct
Answers Low-pressure chillers, atmospheric pressure, non-
condensables, condenser, evaporator, air, operating, leaking,
refrigerant
A 15 psig rated rupture disc is located on the _____________ of
a centrifugal chiller. When charging, refrigerant is introduced
through the evaporator ________________, make sure not to
__________-pressurize the system. Correct Answers
evaporator, charging valve, over
,A certified service technician not being available CANNOT be
used as a reason to
_____________________________________ Correct Answers
Extending Appliance Repair Deadlines
A follow-up leak verification test must be conducted
______________ after a chiller with a charge of 200 pounds of
refrigerant has passed the initial verification leak test Correct
Answers Within 10 Days
A hydrostatic tube test kit is used to determine if a tube is
__________. When leak testing a low-pressure centrifugal
chiller with nitrogen, the maximum test pressure is ______ psig.
Leak testing a low-pressure refrigeration system with nitrogen in
excess of 10 psig could cause the _____________ to fail.
Charged low-pressure refrigeration machines may be most
efficiently leak checked by adding heat with circulated
_____________ or _______________. To reduce refrigerant
loss from the purge unit on an R-123 chiller, always leak test
and repair the __________. A low-pressure refrigeration system
could have a leak in the condenser or chiller barrel tubes if
excessive moisture continuously collects in the __________
unit. Correct Answers leaking, 10, rupture disc, hot water,
heating blankets, chiller, purge
A low-pressure chiller used for comfort cooling must be
repaired if it has an annual leak rate of ______ of the total
charge.
A. 10 percent
, B. 20 percent
C. 30 percent
D. 50 percent Correct Answers A
A safety precaution that should be adhered to for low-pressure
systems is the _________________________ when working
with liquid refrigerant Correct Answers Use of Gloves and
Safety Goggles
A water-cooled recovery unit will allow for ___________
recovery of large quantities of refrigerant. Water is circulated
through a chiller during refrigerant evacuation/ recovery to
prevent ____________ of water in the appliance. Correct
Answers faster, freezing
After all the liquid has been removed from an average 350 ton,
low-pressure appliance, approximately how much vapor
refrigerant remains in the system?
A. 100 pounds
B. 150 pounds
C. 350 pounds
D. 45 pounds Correct Answers A
After reaching the required recovery vacuum on a
_______________________, wait a few minutes to see if the
system pressure rises before ___________. When leaks in the
appliance make _________________ to the prescribed level
unattainable, do not proceed with the recovery. Recovery and
recycling equipment must be labeled as certified to meet
Answers | With Complete Solutions
____________________ indicates air in a low-pressure system
Correct Answers High Head Pressure
____________________ must not be installed in series Correct
Answers Pressure Relief Valves
_____________________ require purge units because they
operate below _____________________. The primary purpose
of a purge unit is to remove ____________________ that leak
into a low-pressure chiller system. The purge unit gets its
suction from a connection on top of the ______________ where
most non-condensables accumulate. After separating the air
from the refrigerant, the purge unit sends the refrigerant back to
the ________________. High head pressure indicates _______
in a low-pressure system and that the purge unit may not be
______________ properly. Excessive running of a purge system
on a low-pressure chiller generally indicates a ____________
system. High-efficiency purge units will discharge a low
percentage of _____________ with the air they remove. Correct
Answers Low-pressure chillers, atmospheric pressure, non-
condensables, condenser, evaporator, air, operating, leaking,
refrigerant
A 15 psig rated rupture disc is located on the _____________ of
a centrifugal chiller. When charging, refrigerant is introduced
through the evaporator ________________, make sure not to
__________-pressurize the system. Correct Answers
evaporator, charging valve, over
,A certified service technician not being available CANNOT be
used as a reason to
_____________________________________ Correct Answers
Extending Appliance Repair Deadlines
A follow-up leak verification test must be conducted
______________ after a chiller with a charge of 200 pounds of
refrigerant has passed the initial verification leak test Correct
Answers Within 10 Days
A hydrostatic tube test kit is used to determine if a tube is
__________. When leak testing a low-pressure centrifugal
chiller with nitrogen, the maximum test pressure is ______ psig.
Leak testing a low-pressure refrigeration system with nitrogen in
excess of 10 psig could cause the _____________ to fail.
Charged low-pressure refrigeration machines may be most
efficiently leak checked by adding heat with circulated
_____________ or _______________. To reduce refrigerant
loss from the purge unit on an R-123 chiller, always leak test
and repair the __________. A low-pressure refrigeration system
could have a leak in the condenser or chiller barrel tubes if
excessive moisture continuously collects in the __________
unit. Correct Answers leaking, 10, rupture disc, hot water,
heating blankets, chiller, purge
A low-pressure chiller used for comfort cooling must be
repaired if it has an annual leak rate of ______ of the total
charge.
A. 10 percent
, B. 20 percent
C. 30 percent
D. 50 percent Correct Answers A
A safety precaution that should be adhered to for low-pressure
systems is the _________________________ when working
with liquid refrigerant Correct Answers Use of Gloves and
Safety Goggles
A water-cooled recovery unit will allow for ___________
recovery of large quantities of refrigerant. Water is circulated
through a chiller during refrigerant evacuation/ recovery to
prevent ____________ of water in the appliance. Correct
Answers faster, freezing
After all the liquid has been removed from an average 350 ton,
low-pressure appliance, approximately how much vapor
refrigerant remains in the system?
A. 100 pounds
B. 150 pounds
C. 350 pounds
D. 45 pounds Correct Answers A
After reaching the required recovery vacuum on a
_______________________, wait a few minutes to see if the
system pressure rises before ___________. When leaks in the
appliance make _________________ to the prescribed level
unattainable, do not proceed with the recovery. Recovery and
recycling equipment must be labeled as certified to meet
