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WorksheetsEPA BANK 3 2025
Total questions: 100
Worksheet time: 50mins
Which refrigerant does not need to be recovered?
R-744
carbon monoxide
R-404A
both A and B
An exempt refrigerant is any refrigerant that has a zero-ozone depletion potential (0 ODP) and a global warming potential (GWP) equal to or lower than carbon dioxide, that is a GWP of ___ or less.
1
10
11
12
______________ is an exempt refrigerant.
Carbon dioxide
Ammonia because it is used in absorption and not vapor compression systems
Nitrogen
All of the above
The hydrocarbon refrigerant approved for retrofit into existing household refrigerators is __________.
R-600a if charge is less than 1 ounce
R-290 if charge is less than 2 ounces
any hydrocarbon if the charge is less than 1 ounce
none. Hydrocarbons are not approved for any retrofit applications
Recovery devices for use with small appliances must be capable of _________.
Recovering 90% of the refrigerant when the compressor is operating
Recovering 90% of the refrigerant when the compressor is NOT operating
Achieving a 10-inch vacuum under the conditions of AHRI 740
Recovering 70% of the refrigerant when the compressor is NOT operating
Recovery equipment is certified by ________________.
an ASHRAE-approved laboratory
an EPA-approved laboratory
a SNAP-approved laboratory
any of the above three organizations can approve the testing laboratory
When recovering refrigerant from small appliances, you must recover ________.
at least 85% or the refrigerant
at least 90% of the refrigerant with an inoperative compressor and 80% of the refrigerant with an operative compressor
at least 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor
all the refrigerant down to a vacuum of 500 microns
The sale of reclaimed CFC, HCFC, HFC, and HFO refrigerants is __________.
banned
banned unless you have an approved recovery machine
restricted to use in existing units
restricted to technicians who are EPA certified in refrigerant recovery
If you encounter a small appliance that is leaking, __________.
you must repair the leak within 30 days
you must document all attempts to repair the leak
you do not have to repair the leak
you must recover all remaining refrigerant and dispose of the appliance
Low-loss fittings __________________________.
can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses
only leak small amounts of refrigerant during use
are no longer required to be used because refrigerants are now greener
reduce oil losses during refrigerant recovery
When checking for non-condensables, _______________.
work quickly to prevent safety valves from purging refrigerant
always chill the recovery tank before taking a temperature reading
always heat the recovery tank before taking a pressure reading
make certain the pressure and temperature of the refrigerant are stable and known
Recovered R-410A ___________.
can be recovered into a recovery tank containing R-32 or R-125 because R-410A is a mixture of those two refrigerants
can only be recovered into a tank containing R-407C
can only be recovered into a tank containing R-22 and not R-407C
can only be recovered into an evacuated tank or a tank containing R-410A
For small appliances, a standard vacuum pump _______________.
can be configured as an active recovery device
can only be used as a recovery device in combination with an unpressurized container
can only be used as a recovery device in combination with a pressurized container
can never be used as a recovery device
To reach the necessary recovery level, when using a ____________, it will most likely be essential to heat and strike the compressor with a rubber mallet to release any refrigerant.
self-contained recovery device on a small appliance with an operating compressor
self-contained recovery device on a small appliance with a non-operating compressor
system-dependent active recovery device with an operational compressor
passive recovery device on a small appliance with a non-operating compressor
What requires accessing both the high and low side of the system for refrigerant recovery when using a passive recovery process?
When the system leaks
When the compressor oil is contaminated
When the refrigerant contains non-condensable gasses
When the compressor does not run
Low- and high-side access valves can be installed instead of a single access valve to __________.
speed-up recovery
prevent contamination
prevent oil recovery
remove acids in the system
When recovering refrigerant from a small appliance with a working compressor, you must recover the refrigerant to a vacuum of __________.
4 inches of mercury or 90% of the remaining charge
4 inches of mercury or 90% of the nameplate charge
4 inches of mercury or 80% of the remaining charge
500 microns
What is the pressure of a storage cylinder of R-134a that is stored in a room where the temperature is 100 °F?
37 psig
84 psig
124 psig
207 psig
What is the pressure of a storage cylinder of R-410A that is stored in a room where the temperature is 100 °F?
68 psig
238 psig
319 psig
488 psig
What is the pressure of a storage cylinder of R-404A that is stored in a room where the temperature is 100 °F?
68 psig
237 psig
319 psig
488 psig
Which condition can cause excessive pressure on the high side of a self-contained recovery device?
When the recovery tank valve is closed.
When the recovery tank is extremely hot.
When there is a large volume of non-condensable gas in the refrigerant being recovered.
Any of the above conditions could cause excessive high-side pressure.
If a recovery cylinder is suspected to be contaminated, measure the _______.
pressure of the refrigerant in the cylinder
weight of the cylinder
weight of the cylinder and subtract the empty cylinder weight to get the refrigerant weight
both A and C
The 80% fill level in a recovery tank can be determined by _________.
System superheat when a capillary tube is present or sub-cooling when a thermostatic expansion valve is used
a float switch in the recovery tank
measuring the temperature and pressure in the recovery tank
shaking the tank to feel the liquid refrigerant
Recovery of refrigerant cannot begin if the initial pressure in the system is _________.
above 800 psig
above 550 psig
above 30 psig
0 psig
Solderless piercing valves should never remain permanently installed because they _________.
violate EPA regulations
violate SNAP regulations
tend to leak over time
trap lubricant and cause compressor failure
Which maintenance practice should be performed on a regular basis?
Change the vacuum pump oil.
Check the recovery equipment for leaks.
Check the manifold hose set for leaks.
All of the above
When a pungent odor is detected in the oil, ___________.
the refrigerant should not be recovered; instead vent it
a compressor burnout has probably occurred
it is POE oil
all of the above
Anytime pressurized nitrogen is put into a system, the nitrogen gas __________.
must be recovered
may be vented to the ambient air
must be returned to the cylinder
must be purified before it can be vented
Which refrigerants can be mixed in a system?
R-22 and R-407C
R-22 and R-410A
R-407C and R-410A
Refrigerants cannot be mixed
For a system with an operating compressor and a restricted capillary tube, what is the minimum number of access valves needed and where would you place them?
Only one access valve on the low side of the system
Only one access valve on the high side of the system
Two valves, one on the high side and one on the low side of the compressor
Three valves, one on the high side and one on the low side of the compressor and the third at the condenser outlet
How can you speed refrigerant recovery from a frost-free refrigerator?
Cool the compressor
Heat the recovery cylinder
Turn on the defrost heater
Perform both A and B together
Which of the following is required by the EPA when attaching a gauge set?
A red colored high-pressure hose and a blue colored low-pressure hose
Self-sealing valves on the ends of the gauge set hoses to minimize any release of refrigerant
Manual hand valves on the ends of the gauge set hoses to minimize any release of refrigerant
either B or C
You must know the __________ before beginning a refrigerant recovery.
actual charge in the system
type of refrigerant that is in the system
non-condensable concentration
oil type
Any refrigerant that is vented off the top of a charging cylinder _________.
does not need to be recovered
must be vented because it is full of non-condensables
cannot be reclaimed
must be recovered
Always look for oil contamination when recovering refrigerant because _______.
contaminated oil is hard to remove from the refrigerant
contaminated oil indicates the system will need to be flushed
contaminates destroy recovery tanks
if the refrigerant is contaminated, it does not need to be recovered
A passive system-dependent recovery process _________.
uses a pressurized container
must still use a pressurized container but no pressure relief device is needed
recovers refrigerant in a non-pressurized container
needs a system with an operating compressor
If the refrigerant in a system is suspected to be contaminated, you can ________.
turn the refrigerant in for reclamation
vent the refrigerant because it cannot be recycled
mix the refrigerant with nitrogen, call it a trace gas, leak check, and then vent it
mix the refrigerant with virgin refrigerant to lower the contamination
When ______________, it is a direct service 'drop-in' substitute for R-22.
R-407C is retrofitted into a system with an EXV expansion device
R-410A is retrofitted into a system with a TXV that has a MOP of at least 75 psig
R-290 is retrofitted into a system with a fixed orifice metering device
None of the above. There is no such thing as a 'drop-in' substitute.
When a tank of mixed refrigerant is sent to a reclaimer, they can _____________.
refuse to accept the refrigerant
charge extra for processing it
vent the refrigerant
either A or B
A passive system-dependent recovery process __________.
uses a pump to recover refrigerant
uses a non-pressurized container
can only be performed on a system with an operating compressor
can only be performed on a system with an inoperable compressor
When recovering refrigerant using a passive recovery system and the system has an inoperative compressor, it is _______________.
helpful to heat and strike the compressor with a rubber mallet to release any refrigerant trapped in and under the compressor oil
only necessary to recover the refrigerant that will naturally flow out of the system
only necessary to recover the refrigerant that will naturally flow out of the system when the compressor is heated to 100 °F
necessary to blow the system oil into the recovery tank with pressurized nitrogen
When installing an access fitting, ________________.
it is not necessary to leak test the access fitting because the recovery will be fast
the fitting should verified to be leak free before beginning any recovery to avoid drawing air into the recovery tank
the fitting should be leak tested before the system is recharged
the fitting should be leak tested after the system is recharged
Always ________________ when connecting or disconnection refrigeration hoses.
wear safety eyewear and butyl-lined gloves
verify the hoses are rated for the refrigerant being used
avoid trapping liquid refrigerant in the hoses
do all of the above
Nitrogen tanks should always be equipped with a __________________.
pressure regulator
pressure relief valve downstream of the regulator
float switch
both A and B
CFC and HCFC refrigerants can decompose to form ______________________.
boric acid
sulfuric acid
hydrochloric and hydrofluoric acids
phosphoric acid
At high temperatures, CFC and HCFC refrigerants decompose into __________.
hydrazine gas
phosgene gas
hydrogen gas
chlorine gas
If a large leak of refrigerant occurs, __________________________.
put on butyl-lined gloves and try to stop the leak ASAP
turn off the leak detector because high concentrations of refrigerant will destroy any leak detector
immediately vacate and naturally ventilate the area
both A and B
A very large refrigerant leak can cause suffocation because refrigerants _______.
cause asthmatic symptoms making breathing difficult
are lighter than air making breathing difficult
are heavier than air and displace oxygen
lead to serious lung irritation
HC refrigerant systems require permanent safety markings ________________.
on or near any evaporators and near any exposed refrigerant tubing
near the machine compartment
on the exterior of the refrigerator
at all of the above locations
Look for ________________ when trying to find a leak in a system.
frost
wax residue
superheat
water stains
oil residue
For a belt-driven non-hermetic compressor system, the ________________ is most likely to leak if the system has not been operated for several months.
head gasket
shaft seal
king valves
filter drier
What is an acceptable trace gas?
Nitrogen mixed with a trace amount of R-22
Nitrogen with a trace amount of the system's design refrigerant
Nitrogen with a trace amount of R-410A
Either A or B
________________________ indicates low charge in a high-pressure system with a capillary tube.
Low superheat
Low subcooling
Excessive superheat
Excessive vibration
After buttoning up a system, the next step is to ________________.
pull a vacuum to leak check the system
pressurize with nitrogen and leak check
pressurize with refrigerant and leak check
charge the system to the nameplate charge and start the compressor
According to the EPA, soap bubbles are best used to ____________________.
pin point refrigerant leaks
find oil leaks on the coil fin area
find leaks in chiller tube barrels
detect leaks on dirty coil fins
After installing a new split-system AC unit, the next step is to _______________.
pressurize with air and leak check the system
pressurize with a nitrogen/R-22 mixture and leak check the system
pressurize with nitrogen and leak check the system
charge the system and verify operation
When planning on using a refrigerant leak detector, an R-407C system should be leak checked with _______________.
pressurized nitrogen and any HFC
pressurized nitrogen and R-22
pressurized nitrogen and a trace amount of R-407C
R-407C
After January 1, 2019, any commercial refrigeration systems containing 50 pounds or more of refrigerant must be repaired if the leak rate exceeds _______________.
10 percent or more per year of the normal charge
20 percent or more per year of the normal charge
30 percent or more per year of the normal charge
35 percent or more per year of the normal charge
A supermarket rack refrigeration system containing 600 pounds of refrigerant had a significant leak and you have successfully repaired the leak and perform a successful initial leak verification test. When must the follow up leak verification test be performed?
Within 3 days
Within 7 days
Within 10 days
Within 20 days
After repairing a leak in a rack refrigeration system, the system fails the initial leak repair verification test. What do you do next?
If the 30-day repair window has expired, you must document all repair efforts and notify EPA of the reason you could not fix the leak. Then retrofit or replace the equipment.
If the 30-day repair window has expired and you cannot get the parts you need to repair the system, you can apply to the EPA for an extension.
If the 30-day repair window has not expired, perform additional repairs and retest within the 30-day repair window.
Any of the above options are acceptable to the EPA.
When the 30-day repair window has expired and you have to request a time extension from the EPA, what CANNOT be used as a reason to extend the deadline?
Requirements of federal, state, or local regulations make the repair within 30 days impossible.
A necessary component is not available.
The appliance is located in an area that is subject to radiological contamination.
A service technician is not available.
What must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of R-22 do when the leak rate threshold has been exceeded?
Take further action by repairing, retiring, mothballing, or retrofitting the appliance.
Turn the system off.
Disconnect the electrical power to the system.
Introduce a UV leak detection dye so the leak will be found in the future and then disconnect power.
If an owner of a system with a charge of 50 or more pounds decides to retire the unit and replace the unit with a new unit that uses an EXEMPT refrigerant, the appliance owner has _______________ to retire the appliance.
3 months
6 months
12 months
18 months
If an owner of a system with a charge of 50 or more pounds decides to retire the unit and replace the unit with a new unit that uses a NON-EXEMPT refrigerant, the appliance owner has _______________ to retire the appliance.
3 months
6 months
12 months
18 months
Owners of a cold storage warehouse can't repair their R-22 refrigeration unit, so they are going to retire the unit without replacing the unit. How long can they operate the leaking unit before it must be retired?
3 months
9 months
12 months
18 months
Owners of a cold storage warehouse can't repair their R-22 refrigeration unit (normal system charge is 80 pounds), so they are going to retire the unit. The owner plans to operate the unit until it is retired. How much refrigerant can the owner add to the leaking system before it is retired?
8 pounds
16 pounds
24 pounds
none
What must owners/operators do if their supermarket system that contains 60 pounds of R-22 leaks more than 125% of its full charge in a calendar year?
Retrofit the appliance within 15 days
Repair the unit within 60 days
Mothball the unit immediately
Submit a report to EPA describing efforts to identify leaks and repair the appliance
An owner of a system with 55 pounds of refrigerant is required to keep records of leak inspections, and any initial leak verification and follow-up verification tests for _________.
120 days
3 years
72 months
10 years after any significant leak was discovered
To mothball a system with 60 pounds of refrigerant, you must _________.
shut down the appliance temporarily, and recover the refrigerant from the leaking isolated section or from the entire system to at least atmospheric pressure
remove the appliance and store it at an off-site facility
remove the compressor
immediately shut down the appliance and disconnect electrical power
After repairing a significant leak in a system with 60 pounds of refrigerant, how many successful verification tests are required?
One performed before the appliance is recharged.
Two, one before the system is recharged, and the second performed after the appliance returns to normal operating conditions.
Three, one before the system is recharged, the second performed after the appliance returns to normal operating conditions, and the third performed within 10 days.
None.
After January 1, 2019, any comfort cooling systems containing 50 pounds or more of refrigerant must be repaired if the leak rate exceeds _______________.
10 percent or more per year of the normal charge
20 percent or more per year of the normal charge
25 percent or more per year of the normal charge
30 percent or more per year of the normal charge
_______________ appliances are defined by the EPA as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities.
Comfort heating
Critical cooling
Comfort cooling
Dehumidification cooling
_______________ appliances are defined by the EPA as refrigeration appliances used in the retail food and cold storage warehouse sectors.
Commercial refrigeration
Process refrigeration
Food refrigeration
Warehouse refrigeration
To determine the system charge for leakage rate calculations, the EPA allows the use of calculations based on ____________________________.
compressor current draw
power usage
component and pipe sizes
refrigeration or cooling capacity
A factory has a chiller with 200 pounds of charge that uses 65% of the chiller's cooling capacity to cool a manufacturing line and the remaining 35% of the chiller's cooling capacity is used to air condition the office space in the factory. Which leak rate category would this chiller be in?
industrial process refrigeration
comfort cooling
mixed-use cooling
industrial comfort cooling
You have repaired a significant leak in an industrial process refrigeration system that contains 1000 pounds of R-404A. How often is the owner required to perform a leak inspection to verify the system is no longer leaking?
Every 2 months
Every 3 months
Every 4 months
Every 12 months
You have repaired a significant leak in an industrial process refrigeration system that contains 200 pounds of R-404A. How often is the owner required to perform a leak inspection to verify the system is no longer leaking?
Every 2 months
Every 3 months
Every 4 months
Every 12 months
You must calculate the leak rate ________________.
following a retrofit or new install
every time you top off a system
every time you top off a system that has a normal charge of 50 pounds or more
every time you top off a comfort cooling system
A comfort-cooling appliance containing 60 pounds of refrigerant has a significant leak. You have ______________ to repair the leak and perform a successful initial leak verification test.
15 days
30 days
45 days
120 days
EPA-approved recycling and recovery equipment must ____________.
be tested by an EPA-approved third party and have a label verifying it meets EPA requirements
be equipped with low-loss fittings
be certified for use with the refrigerant being recovered or recycled
be all of the above
You are changing out the compressor of a system containing 40 pounds of R-404A, you must _______.
isolate the compressor, vent the refrigerant in the compressor to 0 psig, and remove the compressor
isolate the compressor, evacuate the isolated section of the system to 0 psig, and if system pressure does not rise after a few minutes, remove the compressor
vent the refrigerant from the entire system because the compressor is bad
calculate the leak rate to be certain you don't have a substantial leak before removing the compressor
After reaching the required recovery vacuum on a system, _______________.
immediately open the system before there is any more out-gassing
wait at least a few minutes to see if the system pressure rises
break the vacuum with compressed air
purge the system with R-410A or R-134a to flush refrigerant from the oil
You have to open an R-410A system with a normal charge of 250 pounds. To replace a compressor, you must evacuate the system to _______________.
0 psig
25 mm Hg absolute
10 inches of Hg vacuum
15 inches of Hg vacuum
If leaks in a system make the recovery to a required evacuation level unattainable or if reaching this level of evacuation would draw air into the recovered refrigerant, you are only required to recover down to a pressure of _______________.
10 psig
5 psig
0 psig
5 inches of mercury
Which repair is ALWAYS considered "major system repair" under EPA's regulations?
replacement of a condenser
replacement of a capacitor
replacement of a fan blade
replacement of an evaporator blower motor
It is against EPA regulations to use system-dependent recovery unit when the _______________.
normal charge of the system is more than 5 pounds
ambient temperature is over 95 °F
appliance contains over 15 pounds of refrigerant
appliance has a leak
When beginning recovery, it is fastest to remove the refrigerant as a __________.
vapor
mixture
liquid
The state of the refrigerant does not affect the recovery rate.
Why do manifold gauge set hoses have self-sealing connectors or hand valves on the ends of the hoses?
To prevent the trapping of liquid refrigerant in the hoses
Because they are required by the EPA
To minimize refrigerant losses when the hoses are connected and disconnected to the system
Both B and C
During a TXV repair, refrigerant was recovered from the system. The refrigerant __________.
can be charged back into the same system after repairs are made and the system is leak checked and properly evacuated
can be sold because it is probably ok
must be reclaimed because it was a major system repair
must be destroyed because it was a major system repair
Before recovering refrigerant into an empty recovery tank, you must __________.
test the refrigerant for acid
purge the cylinder with nitrogen
heat the cylinder
evacuate the cylinder
Before using a recovery unit, you should __________.
test the refrigerant for moisture
test the refrigerant for acid
heat the recovery unit and recovery cylinder
check the service valve positions and recovery oil level (if recovery compressor is not oil less) before turning the recovery unit on
Refrigerant should be removed from the condenser outlet when the __________.
condenser is below the receiver
condenser is above the receiver
condenser is above the evaporator
compressor is leaking
A system with a large liquid receiver needs a major system repair to replace a faulty TXV. When servicing the unit _______________.
the compressor should be isolated
the liquid refrigerant should be recovered last
the refrigerant should be recovered to or isolated in the receiver
the refrigerant in the liquid recover can be vented
An HVAC company must keep records for each disposed appliance with a charge between 5 and 50 pounds for _________.
30 days
18 months
3 years
5 years
To recover liquid refrigerant, it is best to connect to the __________.
compressor suction
compressor discharge
liquid line
evaporator outlet
Recovering refrigerant as a vapor minimizes the removal of _______ from the system.
moisture
acid
oil
non-condensables
After all the liquid refrigerant has been recovered from a system, the remaining vapor ____.
must be purged to the atmosphere
can be vented or recovered
left in the system if it is being discarded
must be removed by the recovery system to the required evacuation level
_____________ will speed up recovery.
Using a smaller recovery tank
Cooling the recovery tank
Heating the recovery tank
Cooling the system
A hermetic compressor overheats if operated in a vacuum because ________.
it runs faster when operated in a vacuum
the compressor motor uses the flow of refrigerant through the compressor for cooling
the oil has lower lubricity when exposed to a vacuum
off-gassing of acid from the oil causes the compressor to overheat
You have a recovery machine certified for both R-407C and R-410A with R-410A refrigerant in it. You now have to recover refrigerant from a R-407C unit. What must be done before beginning the R-407C recovery?
Nothing has to be done to the recovery unit, but you must change the recovery cylinder to one that holds R-407C.
Nothing, it is a dual refrigerant machine and both refrigerants are alternatives to R-22.
Change the filter on the recovery machine.
Remove the R-410A from the recovery unit (and hoses), change the filter drier, and change the recovery cylinder to an R-407C cylinder.
