Which of the precautions listed should be taken before opening any part of a refrigeration system for the purpose of accomplishing non-major repairs?
Set the high-pressure cut-out on manual to prevent automatic starting.
Bring the part of the system to be opened to 0 psig.
Use the hot gas defrost line to remove any frost on the evaporator coils.
Bring the part of the system to be opened to a pressure corresponding to the ambient temperature.
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