Refrigerant and Oil Chemistry and
Management—Recovery, Recycling,
Reclaiming, and Retrofitting Unit 9
A DOT-approved refrigerant recovery cylinder is color-coded - ANSWER-gray with a
yellow top.
All of the following tasks are part of a refrigerant retrofitting process except - ANSWER-
ensure that the evaporator fan motor is off during system charging.
An increase in the natural greenhouse effect that leads to the heating of the earth is
called - ANSWER-global warming.
CFCs are more harmful to the stratospheric ozone layer than HFCs because CFCs
contain - ANSWER-chlorine.
HFO refrigerants are classified as having - ANSWER-low GWPs and low ODPs.
How are oil-less compressors on recovery units lubricated? - ANSWER-They rely on
residual oil in the recovered refrigerant.
If a refrigerant experiences a temperature glide, which of the following can be correctly
concluded? - ANSWER-The refrigerant is a blended refrigerant.
It is estimated that a single chlorine atom can destroy up to ______ ozone molecules. -
ANSWER-100,000
Low-loss fittings are intended to ensure that - ANSWER-refrigerant losses are
minimized when removing hoses from a system.
Of the following refrigerants, which is best suited as a retrofit refrigerant for an R-22
residential air-conditioning system? - ANSWER-R-407C
Refrigerants R-11, R-12, and R-22 all have what in common? - ANSWER-They are all
methane-based refrigerants.
The Montreal Protocol is best described as a - ANSWER-treaty or agreement among
nations to address ozone depletion.
The most common type of refrigeration oil used in conjunction with HFC refrigerants is -
ANSWER-esters.
The safest overall rating with respect to both toxicity and flammability is - ANSWER-A1.
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