Row1
How should refrigerant cylinders be positioned when they are shipped?
upright
Hydrochlorofluorocarbons (HCFC) refrigerants contain what elements?
hydrogen, chlorine, fluorine, and carbon
when recovering refrigerant, it is important not to mix different refrigerants in the same container. Why?
it is a violation of EPA environmental standards
What is the most serious results of damage to the ozone layer?
increases in human skin cancer
If a system will not hold a vacuum after it has been evacuated, what does this indicate?
the system may be leaking
What gas helps form the earth's protective shield
Stratospheric Ozone
Ozone depletion in the stratosphere is what type of problem (local, regional, national, or global)?
Global
True or False: Vacuum line (hoses) should be equal to or larger than pump intake connection.
True
Which of the following is an example of a CFC refrigerant (R-134a, R-123, R-33, or R-12)?
R-12
When a question contains three very long answer choices about where chlorine in the stratosphere comes from, the answer is most likely going to be what?
All of the above
Which of the following refrigerants has the lowest ozone depletion potential (R-22, R-123, R-134a, or R-502)?
R-134a
A refrigerant cylinder that has a gray body and a yellow top indicates the cylinder is designed to hold what?
recovered refrigerant
Violation of the Clean Air Act, including knowingly release of refrigerant during the maintenance, service, repair, or disposal of appliances, can result in fines up to how much per day per violation?
$27,500
Refrigerant vapors or mist in high concentrations should be inhaled since they can cause what two effects?
heart irregularities or unconsciousness
After 1995, supplies of CFC refrigerant for equipment servicing will come from what/where?
recovery and recycling
Disposing of disposable cylinders is accomplished by doing what steps?
assuring that all refrigerant is recovered and that cylinders are rendered useless, then recycling the metal
A refrigerant oil that is hygroscopic can do what?
readily absorbs moisture
Which of the following is illegal to do: use CFC or HCFC refrigerants, manufacture or import HCFC refrigerants into the U.S., knowingly release CFC or HCFC refrigerants with the except of de minimis releases, or all three of them?
knowingly release CFC or HCFC refrigerants and their substitutes during the service, maintenance, repair, or disposal of appliances, with the exception of de minimis releases
What is unique about azeotropic refrigerant mixture?
it is a mixture made from at least three component refrigerants
What is the Montreal Protocol?
a treaty among nations that controls production of chlorofluorocarbons and hydrochlorofluorocarbons
Cooling occurs in a direct-expansion vapor-compression refrigeration system when what happens to the refrigerant?
refrigerant liquid turns to a vapor
What makes a recovery device "self-contained?"
it can capture liquid and/or vapor refrigerant without the assistance of components (compressor) in the air-conditioning of refrigeration equipment
What is being done in the U.S. to stop damage to the stratospheric ozone layer?
capturing and ultimately eliminating use of chlorofuorocarbons
Removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in an way defines what word?
recovering
The center port on a three port manifold is used for what three purposes?
recovery, evacuation, and charging