EPA 608 UNIVERSAL EXAM QUESTIONS WITH
VERIFIED SOLUTIONS (2025/2026) AGRADE
Before beginning a refrigerant recovery procedure, it is ALWAYS
necessary to: - ANSWER ->know the type of refrigerant in the system
Which of the following gases is used as the baseline measurement for
global warming potential? - ANSWER ->Carbon Dioxide
Which hydrocarbon refrigerant is approved for retrofit into existing
household refrigerators? - ANSWERHC R-600a 2 ounces or less
Recovered refrigerant may contain which of the following impurities? -
ANSWER ->Acids, moisture, and oil
A hydrostatic tube test kit will - ANSWER ->determine if a lube leaks
When installing any type of access fitting onto a sealed system: -
ANSWER ->the fitting should be leak tested before proceeding with
recovery
,A chiller with a charge of 200 pounds of an ozone-depleting refrigerant
has passed the initial verification leak test. When must a follow-up
verification test be conducted? - ANSWER ->Within 10 days
Why are some hydrofluoroolefin (HFO) refrigerants classified as "A2L"?
- ANSWER ->They are less flammable than hydrocarbon refrigerants,
but most are still mildly flammable
To determine if the system is leaking more than the allowed rate, the
EPA allows the use of which one of the following methods to determine
the full charge? - ANSWER ->Use of calculations based on component
and pipe sizes
When could a reciprocating compressor be damaged if energized? -
ANSWER ->When the discharge service valve is closed
Which of the following are included in EPA's definition of a "small
appliance"? - ANSWER ->Products manufactured, fully charged and
hermetically sealed in a factory
Recovering refrigerant from a system in the vapor phase will minimize
the loss of which of the following? - ANSWER ->Oil
,Which of the following is an indicator of a leak in a high-pressure
system with a capillary tube? - ANSWER ->Excessive superheat
A typical setting for the high-pressure cut-out control on a recovery unit
used for evacuating the refrigerant from a low-pressure chiller is: -
ANSWER ->10 psig
When is it essential to take measures to help release trapped CFC,
HCFC, or HFC refrigerant from the compressor oil during refrigerant
recovery? - ANSWER ->When using self-contained recovery devices
Excessive running of a purge system on a low-pressure chiller generally
indicates what condition? - ANSWER ->Leaking system
Which of the following always falls under the EPA definition for "major
maintenance, service, or repair"? - ANSWER ->Replacing a compressor
What effect will low ambient temperatures have on recovery? -
ANSWER ->Increase the recovery time What should be used to remove
ice from sight glasses or viewing glasses? - ANSWER ->An alcohol spray
After installation of a field piped split system, the unit should first be
pressurized with: - ANSWERnitrogen and leak checked
Pressure relief valves can only be installed: - ANSWER ->in parallel
, How many access valves are needed to recover the refrigerant on a
sealed system with an operating compressor that has a completely
restricted capillary tube? - ANSWER ->Only one access valve, on the
high side of the system
What are two factors that, if present, are most likely to lead to an
explosion with hydrocarbon refrigerants? - ANSWER ->A sufficient
concentration of the refrigeration in the space and an ignition source
An appliance normally containing more than 50 pounds of R-22
refrigerant was found to have a 35% annual leak rate. After the repair,
how many successful verification tests are required? - ANSWER ->Two.
Performed before the appliance is recharged
All appliances must be equipped with a service aperture or process stub
which is used when adding or removing refrigerant from the appliance.
What is typically used on small appliances? - ANSWER ->A straight piece
of tubing that is entered using a piercing access valve. Process Tube
What is the primary purpose of a purge unit on a low-pressure chiller? -
ANSWER ->Remove noncondensable from the system
Which of the following are recommended safe work practices when
recovering refrigerants? - ANSWER -> Wear safety eyewear and butyl-
lined gloves when connecting/disconnecting hoses
VERIFIED SOLUTIONS (2025/2026) AGRADE
Before beginning a refrigerant recovery procedure, it is ALWAYS
necessary to: - ANSWER ->know the type of refrigerant in the system
Which of the following gases is used as the baseline measurement for
global warming potential? - ANSWER ->Carbon Dioxide
Which hydrocarbon refrigerant is approved for retrofit into existing
household refrigerators? - ANSWERHC R-600a 2 ounces or less
Recovered refrigerant may contain which of the following impurities? -
ANSWER ->Acids, moisture, and oil
A hydrostatic tube test kit will - ANSWER ->determine if a lube leaks
When installing any type of access fitting onto a sealed system: -
ANSWER ->the fitting should be leak tested before proceeding with
recovery
,A chiller with a charge of 200 pounds of an ozone-depleting refrigerant
has passed the initial verification leak test. When must a follow-up
verification test be conducted? - ANSWER ->Within 10 days
Why are some hydrofluoroolefin (HFO) refrigerants classified as "A2L"?
- ANSWER ->They are less flammable than hydrocarbon refrigerants,
but most are still mildly flammable
To determine if the system is leaking more than the allowed rate, the
EPA allows the use of which one of the following methods to determine
the full charge? - ANSWER ->Use of calculations based on component
and pipe sizes
When could a reciprocating compressor be damaged if energized? -
ANSWER ->When the discharge service valve is closed
Which of the following are included in EPA's definition of a "small
appliance"? - ANSWER ->Products manufactured, fully charged and
hermetically sealed in a factory
Recovering refrigerant from a system in the vapor phase will minimize
the loss of which of the following? - ANSWER ->Oil
,Which of the following is an indicator of a leak in a high-pressure
system with a capillary tube? - ANSWER ->Excessive superheat
A typical setting for the high-pressure cut-out control on a recovery unit
used for evacuating the refrigerant from a low-pressure chiller is: -
ANSWER ->10 psig
When is it essential to take measures to help release trapped CFC,
HCFC, or HFC refrigerant from the compressor oil during refrigerant
recovery? - ANSWER ->When using self-contained recovery devices
Excessive running of a purge system on a low-pressure chiller generally
indicates what condition? - ANSWER ->Leaking system
Which of the following always falls under the EPA definition for "major
maintenance, service, or repair"? - ANSWER ->Replacing a compressor
What effect will low ambient temperatures have on recovery? -
ANSWER ->Increase the recovery time What should be used to remove
ice from sight glasses or viewing glasses? - ANSWER ->An alcohol spray
After installation of a field piped split system, the unit should first be
pressurized with: - ANSWERnitrogen and leak checked
Pressure relief valves can only be installed: - ANSWER ->in parallel
, How many access valves are needed to recover the refrigerant on a
sealed system with an operating compressor that has a completely
restricted capillary tube? - ANSWER ->Only one access valve, on the
high side of the system
What are two factors that, if present, are most likely to lead to an
explosion with hydrocarbon refrigerants? - ANSWER ->A sufficient
concentration of the refrigeration in the space and an ignition source
An appliance normally containing more than 50 pounds of R-22
refrigerant was found to have a 35% annual leak rate. After the repair,
how many successful verification tests are required? - ANSWER ->Two.
Performed before the appliance is recharged
All appliances must be equipped with a service aperture or process stub
which is used when adding or removing refrigerant from the appliance.
What is typically used on small appliances? - ANSWER ->A straight piece
of tubing that is entered using a piercing access valve. Process Tube
What is the primary purpose of a purge unit on a low-pressure chiller? -
ANSWER ->Remove noncondensable from the system
Which of the following are recommended safe work practices when
recovering refrigerants? - ANSWER -> Wear safety eyewear and butyl-
lined gloves when connecting/disconnecting hoses
