What should a technician do with a DOT 39 nonrefillable cylinder when it is empty?
A) The cylinder should be returned to the refrigerant manufacturer to be reused.
B) Knock out the relief disk to remove the residual refrigerant and label the cylinder empty.
C) Recover any remaining refrigerant, open the valve, knock out the relief disk, and label it EMPTY.
D) Once most of the refrigerant has been used, the residual may be released to the air.
C
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a. fifth b. fourth c. third d. half
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