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Terms in this set (61)
The hydrocarbon refrigerant approved for retrofit into existing household refrigerators is
none. Hydrocarbons are not approved for any retrofit applications
Low-loss fittings __.
can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses
Any refrigerant that is vented off the top of a charging cylinder ________.
must be recovered
For small appliances, a standard vacuum pump ________.
can only be used as a recovery device in combination with an unpressurized container
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.
Which of the following is required by the EPA when attaching a gauge set?
either B or C
Recovery devices for use with small appliances must be capable of ________.
recovering 90% of the refrigerant when the compressor is operating
HC refrigerant systems require permanent safety markings ________.
at all of the above locations
Recovered R-410A ________.
can only be recovered into an evacuated tank or a tank containing R-410A
Small appliance servicing requires a ________ or Universal certification.
When checking for non-condensables, ________.
make certain the pressure and temperature of the refrigerant are stable and known
A small appliance is defined as a system that is ________.
manufactured, fully charged, and hermetically sealed in a factory with a charge of 5 pounds or less
Which refrigerants can be mixed in a system?
Refrigerants cannot be mixed
Which refrigerant does not need to be recovered?
both A and B
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
If a large leak of refrigerant occurs, ________.
immediately vacate and naturally ventilate the area
Solderless piercing valves should never remain permanently installed because they ________.
tend to leak over time
Recovery of refrigerant cannot begin if the initial pressure in the system is ________.
________is an approved refrigerant for new household refrigerators, freezers, and combination refrigeration/freezers.
A process stub is a ________.
straight piece of tubing that is entered using a piercing access valve
When a tank of mixed refrigerant is sent to a reclaimer, they can ________.
either A or B
New household refrigerators with a charge of less than 57 grams (2 ounces weight) can use any of the following refrigerants, EXCEPT.
Always look for oil contamination when recovering refrigerant because ________.
contaminated oil indicates the system will need to be flushed
The 80% fill level in a recovery tank can be determined by ________
a float switch in the recovery tank
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 refrigerant.
A very large refrigerant leak can cause suffocation because refrigerants ________.
are heavier than air and displace oxygen
If a recovery cylinder is suspected to be contaminated, measure the ________.
pressure of the refrigerant in the cylinder
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.
passive recovery devices on a small appliance with a non-operating compressor
Which maintenance practice should be performed on a regular basis?
All of the above
CFC and HCFC refrigerants can decompose to form ________.
hydrochloric and hydrofluoric acids
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 high side of the system
Always ________ when connecting or disconnection refrigeration hoses.
do all of the above
A ________ recovery device can be used for Type I small appliance applications or Type II applications if the total charge is below 15 pounds.
Recovery equipment is certified by ________.
an EPA-approved laboratory
The maximum allowable factory charge for a Type I appliance is ________.
If you encounter a small appliance that is leaking, ________.
you do not have to repair the leak
A passive system-dependent recovery process ________.
uses a non-pressurized container
________ can be vented.
all of the above
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.
A passive recovery device can be used for a ________.
both B and C
What is the pressure of a storage cylinder of R-410A, that is stored in a room where the temperature is 100 °F?
At high temperatures, CFC and HCFC refrigerants can decompose into ________.
Nitrogen tanks should always be equipped with a ________.
both A and B
Low- and high-side access valves can be installed instead of a single access valve ________.
to speed-up recovery
When installing an access fitting, ________.
the fitting should be verified as leak free before beginning any recovery to avoid drawing air into the recovery tank
The sale of reclaimed CFC, HCFC, HFC, and HFO refrigerants is ________.
restricted to technicians who are EPA certified in refrigerant recovery
You must have a self-contained recovery machine available unless you only work on ________.
When recovering refrigerant from small appliances, you must recover ________.
at least 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an operative compressor
A passive system-dependent recovery process ________.
recovers refrigerant in a non-pressurized container
What is the pressure of a storage cylinder of R-404A, that is stored in a room where the temperature is 100 °F?
What requires accessing both the high and low side of the system for refrigerant recovery when using a passive recovery process?
When the compressor does not run
If the refrigerant in a system is suspected to be contaminated, you can ________.
turn the refrigerant in for reclamation
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 nameplate charge
When a pungent odor is detected in the oil, ________.
a compressor burnout has probably occurred
You must know the ________ before beginning a refrigerant recovery.
type of refrigerant that is in the system
Any system with a charge of less than ________ pounds can use system-dependent recovery equipment.
What is the pressure of a storage cylinder of R-134a, that is stored in a room where the temperature is 100 °F?
What is not a small appliance?
An MVAC-like system that holds three pounds of R-22
Anytime pressurized nitrogen is put into a system, the nitrogen gas ________.
may be vented to the ambient air
Type I technicians can service any ________.
appliances with 5 pounds or less of refrigerant that have been hermetically sealed and charged at the factory
How can you speed refrigerant recovery from a frost-free refrigerator?
Turn on the defrost heater
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