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