All devices used for refrigerant recovery must
Which safety precaution(s) should always be followed?
Which gas(es) would cause the LEAST damage to the environment during a leak check?
An example of an HFC refrigerant is
In a vapor compression refrigeration system, cooling occurs when
When using a recovery unit, the fill level of the recovery tank can be controlled by
According to ASHRAE’s 1992 refrigerant safety classification, which of the following designations would be the most safe?
Each chlorine atom in the stratosphere can destroy ______ ozone molecules.
To obtain an accurate vacuum reading during system evacuation, the system vacuum gauge should be located
What is the best proof of CFCs in the stratosphere?
Which refrigerant is an HCFC?
When transporting cylinders containing used refrigerant, the DOT requires that you
Never use an open flame to heat a refrigerant tank because
Equipment covered by EPA regulations include
It is important not to mix different refrigerants in the same container because
Which of the following refrigerant releases is a violation of the EPA prohibition on venting?
The over-evacuation of a system
It is important not to mix R-22 and R-410a refrigerants in the same container because
Manifold gauge sets are often color coded. When they are, the low pressure gauge is colored
Refrigerant migrates to the compressor crankcase because of a difference in _______ between the refrigerant and the oil.
Never overfill refrigerant storage cylinders because
The evacuation of a system is a method of
Reusable refrigerant containers that are normally under any pressure above 15 psig, must be hydrostatically tested and date stamped every
Which refrigerant(s) must be recovered before opening a system or disposing of a system
