Which of the precautions listed should be taken before opening any part of a refrigeration system for the purpose of accomplishing non-major repairs?

Question

Accepted Answer

Bring the part of the system to be opened to 0 psig.

Answer

Set the high-pressure cut-out on manual to prevent automatic starting.

Answer

Use the hot gas defrost line to remove any frost on the evaporator coils.

Answer

Bring the part of the system to be opened to a pressure corresponding to the ambient temperature.

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