Page |1
EPA 608 CERTIFICATION TEST 2026/2027 BANK 400
QUESTIONS WITH DETAILED VERIFIED ANSWERS / EXAM
QUESTIONS AND VERIFIED ANSWERS |ALREADY GRADED
A+|
Although recovering refrigerant in the vapor phase will minimize
the loss of oil, recovering as much as possible in the liquid phase
will _______ - ANSWER-reduce recovery time.
After recovery, refrigerant may be: - ANSWER-Returned to the
appliance from which it was removed or to another appliance
owned by the same person without being recycled or reclaimed.
Disposable cylinders must be: - ANSWER-Discarded.
It is necessary to frequently check and change the recycling
machine's: - ANSWER-Oil and filter.
, Page |2
Quick couplers, self-sealing hoses, and hand valves should be
used to _____ - ANSWER-minimize refrigerant release when
hoses are connected/disconnected.
A major repair involves removal of _______ - ANSWER-an
auxiliary heat exchanger coil.
Because a low-pressure system operates below atmospheric
pressure (vacuum), leaks in the gasket or fittings will _______ -
ANSWER-cause air and moisture to enter the system.
What can be used to pressurize a system for the purpose of
opening the system for a non-major repair? (Type III) - ANSWER-
Controlled hot water
A recovery unit's high pressure cut-out is set for (Psig for Type III):
- ANSWER-10 psig when evacuating the refrigerant from a low
pressure chiller (rupture disc at 15psig)
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A substantial amount of vapor will remain in the appliance after all
the liquid is removed. An average 350 ton R-11 chiller at 0 psig
still contains what amount of vapor? - ANSWER-100 pounds of
vapor
When removing oil from a low-pressure system, a temperature of
what must be attained? - ANSWER-130 degrees F
Refrigerant recovery from a system using R-11 or R-123 starts
with recovery of (Type III): - ANSWER-Liquid removal, followed by
vapor.
Water must be circulated through the tubes when evacuating
refrigerant in order to prevent ________ - ANSWER-freezing of
the water.
Most low-pressure recovery machines utilize a water-cooled
condenser that is connected to the ________ - ANSWER-
municipal water supply.
, Page |4
Before charging with liquid, how much pressure does an R-11
refrigeration system require (vapor pressure), and how much
saturation temperature? - ANSWER-16.9" hg. vacuum or 36
degrees F.
Two refrigerants are not allowed to collect into one recovery
cylinder because: - ANSWER-Recovering two refrigerants back
from mixture is not possible
What is one refrigerant used in low pressure refrigerated
appliances? - ANSWER-R-123
Low pressure appliances uses a refrigerant with a liquid phase
saturation pressure below 45 psia at 104°F.
Nitrogen reacts with hydrogen to form what? - ANSWER-
Ammonia.
The ______ connects the condenser to the expansion device: -
ANSWER-Liquid line
EPA 608 CERTIFICATION TEST 2026/2027 BANK 400
QUESTIONS WITH DETAILED VERIFIED ANSWERS / EXAM
QUESTIONS AND VERIFIED ANSWERS |ALREADY GRADED
A+|
Although recovering refrigerant in the vapor phase will minimize
the loss of oil, recovering as much as possible in the liquid phase
will _______ - ANSWER-reduce recovery time.
After recovery, refrigerant may be: - ANSWER-Returned to the
appliance from which it was removed or to another appliance
owned by the same person without being recycled or reclaimed.
Disposable cylinders must be: - ANSWER-Discarded.
It is necessary to frequently check and change the recycling
machine's: - ANSWER-Oil and filter.
, Page |2
Quick couplers, self-sealing hoses, and hand valves should be
used to _____ - ANSWER-minimize refrigerant release when
hoses are connected/disconnected.
A major repair involves removal of _______ - ANSWER-an
auxiliary heat exchanger coil.
Because a low-pressure system operates below atmospheric
pressure (vacuum), leaks in the gasket or fittings will _______ -
ANSWER-cause air and moisture to enter the system.
What can be used to pressurize a system for the purpose of
opening the system for a non-major repair? (Type III) - ANSWER-
Controlled hot water
A recovery unit's high pressure cut-out is set for (Psig for Type III):
- ANSWER-10 psig when evacuating the refrigerant from a low
pressure chiller (rupture disc at 15psig)
, Page |3
A substantial amount of vapor will remain in the appliance after all
the liquid is removed. An average 350 ton R-11 chiller at 0 psig
still contains what amount of vapor? - ANSWER-100 pounds of
vapor
When removing oil from a low-pressure system, a temperature of
what must be attained? - ANSWER-130 degrees F
Refrigerant recovery from a system using R-11 or R-123 starts
with recovery of (Type III): - ANSWER-Liquid removal, followed by
vapor.
Water must be circulated through the tubes when evacuating
refrigerant in order to prevent ________ - ANSWER-freezing of
the water.
Most low-pressure recovery machines utilize a water-cooled
condenser that is connected to the ________ - ANSWER-
municipal water supply.
, Page |4
Before charging with liquid, how much pressure does an R-11
refrigeration system require (vapor pressure), and how much
saturation temperature? - ANSWER-16.9" hg. vacuum or 36
degrees F.
Two refrigerants are not allowed to collect into one recovery
cylinder because: - ANSWER-Recovering two refrigerants back
from mixture is not possible
What is one refrigerant used in low pressure refrigerated
appliances? - ANSWER-R-123
Low pressure appliances uses a refrigerant with a liquid phase
saturation pressure below 45 psia at 104°F.
Nitrogen reacts with hydrogen to form what? - ANSWER-
Ammonia.
The ______ connects the condenser to the expansion device: -
ANSWER-Liquid line
