EPA SECTION 608 TYPE III CERTIFICATION
EXAM STUDY GUIDE 2026
COMPREHENSIVE PRACTICE QUESTIONS
AND CORRECT ANSWERS WITH DETAILED
RATIONALES LOW-PRESSURE
APPLIANCES, REFRIGERANT RECOVERY,
LEAK DETECTION, EPA REGULATIONS
AND HVAC TECHNICIAN CERTIFICATION
PREPARATION
what type of refrigerant is clorine free - CORRECT ANSWER -HFC's
HCFC - CORRECT ANSWER -R-22
R-123
R-124
On low pressure chillers, moisture typically enters the refrigerant system
through - CORRECT ANSWER -air leaks from areas with gaskets or fittings
The maximum test pressure for leak testing a low pressure centrifugal is: -
CORRECT ANSWER -10 psig
,Leak test and repair the chiller to reduce refrigerant loss from a pruge unit
on CFC-11 chiller - CORRECT ANSWER -...
A hydrostatic tube test kit is used to: - CORRECT ANSWER -determine if a
tube leaks
Commercial and industrial process refrigeration systems must be repaired
when the leak rate exceeds ____ of the charge per year. - CORRECT
ANSWER -35%
Refrigerant recovery typically start with liquid recovery it is faster. -
CORRECT ANSWER -...
A rupture disc on a recovery vessel for a low pressure refrigerants relieves
at: - CORRECT ANSWER -15 psig
According to ASHRAE Guideline 3-1996, if the pressure in a system rises
from 1 mm Hg to a level above ____ during a standing vacuum test, the
system should be checked for leaks. - CORRECT ANSWER -2.5 mm Hg
The primary water source for a recovery unit condensing coil is _____. -
CORRECT ANSWER -local municipal water supply
When recharging a refrigeration system with R-11, what vaporpressure is
necessary in the shells before changing with liquid? - CORRECT ANSWER -
16.9" Hg vacuum
, After recovering the liquid refrigerant you must: - CORRECT ANSWER -
recover the vapor refrigerant
According to the EPA there is approximately _____ refrigerant vapor left
in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid
has been removed. - CORRECT ANSWER -100 pounds
Charging refrigerant liquid into a refrigeration system when it is under a 29
inch Hg vacuum can cause the: - CORRECT ANSWER -system water to freeze
A system does not have to be evacuated all the way to the required level
when: - CORRECT ANSWER -leaks in the appliance make evacuation to the
prescribed level unattainable
Which of the foloowing repairs would ALWAYS be considered "major"
under EPA's - CORRECT ANSWER -replacement of evaporator coil
Under EPA's regulation's _______ is used to pressurize a low pressure
chiller for the purpose of opening the system for a non major repair? -
CORRECT ANSWER -warming the refrigerant
If you are using a recovery machine manufactored AFTER 11-15-93 you
must evacuate an low pressure appliance to _______ before making a
major repair. - CORRECT ANSWER -25 mm of Hg absolute
After reaching the required recovery vacuum on a chiller, you should -
CORRECT ANSWER -Wait for at least a few minutes to see if the system
EXAM STUDY GUIDE 2026
COMPREHENSIVE PRACTICE QUESTIONS
AND CORRECT ANSWERS WITH DETAILED
RATIONALES LOW-PRESSURE
APPLIANCES, REFRIGERANT RECOVERY,
LEAK DETECTION, EPA REGULATIONS
AND HVAC TECHNICIAN CERTIFICATION
PREPARATION
what type of refrigerant is clorine free - CORRECT ANSWER -HFC's
HCFC - CORRECT ANSWER -R-22
R-123
R-124
On low pressure chillers, moisture typically enters the refrigerant system
through - CORRECT ANSWER -air leaks from areas with gaskets or fittings
The maximum test pressure for leak testing a low pressure centrifugal is: -
CORRECT ANSWER -10 psig
,Leak test and repair the chiller to reduce refrigerant loss from a pruge unit
on CFC-11 chiller - CORRECT ANSWER -...
A hydrostatic tube test kit is used to: - CORRECT ANSWER -determine if a
tube leaks
Commercial and industrial process refrigeration systems must be repaired
when the leak rate exceeds ____ of the charge per year. - CORRECT
ANSWER -35%
Refrigerant recovery typically start with liquid recovery it is faster. -
CORRECT ANSWER -...
A rupture disc on a recovery vessel for a low pressure refrigerants relieves
at: - CORRECT ANSWER -15 psig
According to ASHRAE Guideline 3-1996, if the pressure in a system rises
from 1 mm Hg to a level above ____ during a standing vacuum test, the
system should be checked for leaks. - CORRECT ANSWER -2.5 mm Hg
The primary water source for a recovery unit condensing coil is _____. -
CORRECT ANSWER -local municipal water supply
When recharging a refrigeration system with R-11, what vaporpressure is
necessary in the shells before changing with liquid? - CORRECT ANSWER -
16.9" Hg vacuum
, After recovering the liquid refrigerant you must: - CORRECT ANSWER -
recover the vapor refrigerant
According to the EPA there is approximately _____ refrigerant vapor left
in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid
has been removed. - CORRECT ANSWER -100 pounds
Charging refrigerant liquid into a refrigeration system when it is under a 29
inch Hg vacuum can cause the: - CORRECT ANSWER -system water to freeze
A system does not have to be evacuated all the way to the required level
when: - CORRECT ANSWER -leaks in the appliance make evacuation to the
prescribed level unattainable
Which of the foloowing repairs would ALWAYS be considered "major"
under EPA's - CORRECT ANSWER -replacement of evaporator coil
Under EPA's regulation's _______ is used to pressurize a low pressure
chiller for the purpose of opening the system for a non major repair? -
CORRECT ANSWER -warming the refrigerant
If you are using a recovery machine manufactored AFTER 11-15-93 you
must evacuate an low pressure appliance to _______ before making a
major repair. - CORRECT ANSWER -25 mm of Hg absolute
After reaching the required recovery vacuum on a chiller, you should -
CORRECT ANSWER -Wait for at least a few minutes to see if the system
