What is a blend of two or more components who's equilibrium vapor phase & liquid phase compositions are the same at a given pressure? - Answer- Azeotrope
This is a halogenated hydrocarbon containing one or more of the
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What is a blend of two or more components who's equilibrium vapor phase & liquid phase compositions are the same at a given pressure? - Answer- Azeotrope
This is a halogenated hydrocarbon containing one or more of the three halogens: fluorine, chlorine, and bromine - Answer- Halocarbon
Chlorofluorocarbons (CFCs) consist of? - Answer- Chlorine, fluorine, carbon
CFCs are chemically very stable because they contain no? - Answer- Hydrogen
CFCs are damaging to what layer of the ozone layer? - Answer- Stratospheric
Of the three common types of refrigerants this one has the highest ozone depletion potential (ODP) - Answer- CFCs
These test methods are assumed by the EPA as the most effective methods for locating the general area of small leaks - Answer- Electronic and ultrasonic
After recovery of a system, if the pressure rises above ambient pressure then what is most likely happening? - Answer- Trapped refrigerant is probably boiling off
In cases where the refrigerant cannot be reclaimed due to contamination with other refrigerants, what must be done to the refrigerant? - Answer- Must be destroyed by incineration at an approved facility
Where should the system vacuum gauge be connected? - Answer- As close as possible to the system being evacuated
Import of CFCs will be banned after December 31, what year? - Answer- 1995
A second category of refrigerant is currently available which is hydrochlorofluorocarbons (HCFCs). Although they contain chlorine, which is damaging to the ozone layer, they also contain this which makes them chemically less stable once they enter the atmosphere. - Answer- Hydrogen
Under EPA's regulations, reclaimed refrigerant must meet what standards for purity before it can be resold? - Answer- ARI-700
What type of recovery devices are so named because they depend on components of the system; that is, they capture refrigerant with the assistance of components in the air conditioning or refrigeration equipment as they are emptying. - Answer- System dependent
All devices used for refrigerant recovery must meet what standards? - Answer- EPA
What is one HCFC? - Answer- R-22
Refrigerants that contain no chlorine at all are called? - Answer- HFCs
CH2FCF3 refrigerant is a? - Answer- HFC
Ozone in the stratosphere consist of molecules containing how many oxygen atoms? - Answer- 3
What's in refrigerants causes ozone destruction? - Answer- Chlorine
CFCs are able to reach the stratosphere because? - Answer- They are chemically very stable
The lower case letter following the refrigerant number, as in 134a for example, is the? - Answer- Form of the isomer
What refrigerants are toxic? - Answer- Group 2
What group of refrigerants are nonflammable mixtures of group 1 & 3 refrigerants, which are nonflammable as formulated but who's composition can become flammable do to fractionation under some leakage situations - Answer- Group 4
What group of refrigerants are flammable but not toxic? - Answer- Group 3
What group of refrigerants do not show flame propagation? - Answer- Group 1
R-134a refrigerant tanks are what color? - Answer- Light Blue
Disposable cylinders are manufactured to specifications established by? - Answer- DOT
Every refrigerant cylinder is equipped with what device that will automatically vent pressure from the cylinder before it reaches the rupture point? - Answer- Safety (pressure) relief valve
Refillable cylinders are regulated in their design, fabrication & tested by who for use in the transportation of refrigerants? - Answer- DOT
Capturing and ultimately eliminating the use of chlorofluorocarbons is being done in the United States to stop damage to what layer of the ozone? - Answer- Stratospheric
State and local government's may establish laws that contain what kind of regulations than Clean Air Act/EPA regulations? - Answer- Stricter
What does the clean air act state? - Answer- Calls for the phase-out of CFC/HCFC production also prohibits CFC/HCFC venting as of July 1, 1992 and requires the EPA to set standards for equipment and technicians
Before you dispose of any appliance containing what refrigerant, you must recover the refrigerant - Answer- CFC, HFC, HCFC
CFCs can no longer be manufactured or imported into the United States after what year? - Answer- December 31, 1995
Recovery cylinders are painted what color in the shoulder area and 12 inches down the side? - Answer- Yellow
Refrigerant cylinders must be retested at what intervals? - Answer- Five years
Chemically, oxygen is O2 & ozone is? - Answer- O3
After what year individual servicing and disposing of air-conditioning and refrigeration equipment are prohibited from knowingly venting refrigerant into the atmosphere? - Answer- July 1, 1992
Under the EPA equipment certification requirement, mandatory equipment certification would go into affect on what date? - Answer- November 15, 1993
Under the EPA final rule, technician certification requirements would go into affect on what date? - Answer- November 14, 1994
What means to clean refrigerant for reuse by oil separation and single or multiple passes through devices, such as replaceable poor filter dryers which reduce moisture, acidity and particulate matter? - Answer- Recycling
What term requires chemical analysis of the refrigerant to verify that the ARI 700 purity specifications are met? - Answer- Reclamation
What term means to remove refrigerant in any condition from a system & store it in an extra container without necessarily testing or processing it in any way - Answer- Recovery
Used disposable refrigerant cylinders can be? - Answer- Recycled with other scrap metal after they are emptied and rendered useless
The internal pressure of a cylinder with 1 pound of liquid refrigerant is _____ the internal pressure of a full 50lb cylinder? - Answer- The same as
Refillable containers must meet what requirements? - Answer- DOT
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