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WorksheetsEPA Type 1
Total questions: 55
Worksheet time: 30mins
A passive recovery device can be used for a _______________.
domestic refrigerator with a charge of 3 pounds
small commercial walk-in freezer with a charge of 14 pounds
reciprocating liquid chiller with a charge of 100 pounds
both B and C
Any system with a charge of less than _______ pounds can use system-dependent recovery equipment.
15
10
20
5
The maximum allowable factory charge for a Type I appliance is _______.
1 pound
3 pounds
5 pounds
7 pounds
You must have a self-contained recovery machine available unless you only work on _______________.
small appliances
chillers
extremely low pressure units
very high pressure systems
New household refrigerators with a charge of less than 57 grams (2 ounces weight) can use any of the following refrigerants, EXCEPT _______________.
R-600a
R-1235yf
R-290
R-450A
_______________ is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezers.
R-1234yf
R-600a
R-1234ze(E)
R-1234zd
Which refrigerant does not need to be recovered?
carbon monoxide
R-744
both A and B
R-404A
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
12
11
10
_______________ 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 NOT operating
Recovering 70% of the refrigerant when the compressor is NOT operating
Recovering 90% of the refrigerant when the compressor is operating
Achieving a 10-inch vacuum under the conditions of AHRI 740
Recovery equipment is certified by _______________.
a SNAP-approved laboratory
an EPA-approved laboratory
an ASHRAE-approved laboratory
When recovering refrigerant from small appliances, you must recover _______.
all the refrigerant down to a vacuum of 500 microns
at least 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor
at least 85% of the refrigerant
at least 90% of the refrigerant with an inoperative compressor and 80% of the refrigerant with an operative compressor
The sale of reclaimed CFC, HCFC, HFC, and HFO refrigerants is ____________.
restricted to technicians who are EPA certified in refrigerant recovery
banned unless you have an approved recovery machine
restricted to use in existing units
banned
If you encounter a small appliance that is leaking, ________.
you must recover all remaining refrigerant and dispose of the appliance
you do not have to repair the leak
you must repair the leak within 30 days
you must document all attempts to repair the leak
Low-loss fittings ___________________.
reduce oil losses during refrigerant recovery
are no longer required to be used because refrigerants are now greener
only leak small amounts of refrigerant during use
can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses
When checking for non-condensables, ______________.
make certain the pressure and temperature of the refrigerant are stable and known
always heat the recovery tank before taking a pressure reading
always chill the recovery tank before taking a temperature reading
work quickly to prevent safety valves from purging refrigerant
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 an evacuated tank or a tank containing R-410A
can only be recovered into a tank containing R-22 and not R-407C
can only be recovered into a tank containing R-407C
For small appliances, a standard vacuum pump ______________.
can never be used as a recovery device
can only be used as a recovery device in combination with a pressurized container
can only be used as a recovery device in combination with an unpressurized container
can be configured as an active 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.
system-dependent active recovery device with an operational compressor
self-contained recovery device on a small appliance with a non-operating compressor
self-contained recovery device on a small appliance with an operating 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 refrigerant contains non-condensable gasses
When the system leaks
When the compressor oil is contaminated
When the compressor does not run
Low- and high-side access valves can be installed instead of a single access valve ________.
to remove acids in the system
to prevent oil recovery
to prevent contamination
to speed-up recovery
When recovering refrigerant from a small appliance with a working compressor, you must recover the refrigerant to a vacuum of ______________.
What is the pressure of a storage cylinder of R-134a that is stored in a room where the temperature is 100 °F?
207 psig
124 psig
84 psig
37 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
319 psig
488 psig
237 psig
Which condition can cause excessive pressure on the high side of a self-contained recovery device?
Any of the above conditions could cause excessive high-side pressure.
When there is a large volume of non-condensable gas in the refrigerant being recovered.
When the recovery tank is extremely hot.
When the recovery tank valve is closed.
If a recovery cylinder is suspected to be contaminated, measure the ______.
weight of the cylinder
pressure of the refrigerant in 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 ______.
shaking the tank to feel the liquid refrigerant
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
Recovery of refrigerant cannot begin if the initial pressure in the system is _______.
above 800 psig
above 550 psig
0 psig
above 30 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.
All of the above
Check the manifold hose set for leaks.
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 purified before it can be vented
must be returned to the cylinder
must be recovered
may be vented to the ambient air
Which refrigerants can be mixed in a system?
R-22 and R-407C
Refrigerants cannot be mixed
R-22 and R-410A
R-407C and R-410A
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?
Three valves, one on the high side and one on the low side of the compressor and the third at the condenser outlet
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
Only one access valve on the low side of the system
How can you speed refrigerant recovery from a frost-free refrigerator?
Cool the compressor
Heat the recovery cylinder
Perform both A and B together
Turn on the defrost heater
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.
oil type
type of refrigerant that is in the system
non-condensable concentration
actual charge in the system
Any refrigerant that is vented off the top of a charging cylinder _______.
must be recovered
cannot be reclaimed
must be vented because it is full of non-condensables
does not need to be recovered
Always look for oil contamination when recovering refrigerant because _______.
if the refrigerant is contaminated, it does not need to be recovered
contaminates destroy recovery tanks
contaminated oil indicates the system will need to be flushed
contaminated oil is hard to remove from the refrigerant
A passive system-dependent recovery process ________.
uses a pressurized container
needs a system with an operating compressor
recovers refrigerant in a non-pressurized container
must still use a pressurized container but no pressure relief device is needed
If the refrigerant in a system is suspected to be contaminated, you can _______.
mix the refrigerant with virgin refrigerant to lower the contamination
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
When __________, it is a direct service 'drop-in' substitute for R-22.
None of the above. There is no such thing as a 'drop-in' substitute.
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
When a tank of mixed refrigerant is sent to a reclaimer, they can _________.
refuse to accept the refrigerant
vent the refrigerant
either A or B
charge extra for processing it
A passive system-dependent recovery process __________.
can only be performed on a system with an inoperable compressor
uses a pump to recover refrigerant
uses a non-pressurized container
can only be performed on a system with an operating compressor
When recovering refrigerant using a passive recovery system and the system has an inoperative compressor, it is ___________.
necessary to blow the system oil into the recovery tank with pressurized nitrogen
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
When installing an access fitting, ________________.
the fitting should be leak tested after the system is recharged
it is not necessary to leak test the access fitting because the recovery will be fast
the fitting should be leak tested before the system is recharged
the fitting should verified to be leak free before beginning any recovery to avoid drawing air into the recovery tank
Always ______________ when connecting or disconnection refrigeration hoses.
do all of the above
avoid trapping liquid refrigerant in the hoses
verify the hoses are rated for the refrigerant being used
wear safety eyewear and butyl-lined gloves
Nitrogen tanks should always be equipped with a _________________
both A and B
float switch
pressure relief valve downstream of the regulator
pressure regulator
CFC and HCFC refrigerants can decompose to form ___________________.
boric acid
sulfuric acid
phosphoric acid
hydrochloric and hydrofluoric acids
At high temperatures, CFC and HCFC refrigerants decompose into ___________.
hydrazine gas
chlorine gas
phosgene gas
hydrogen 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
both A and B
immediately vacate and naturally ventilate the area
Where must permanent safety markings be placed on HC refrigerant systems?
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
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
