65. When recovering vapor from a low pressure refrigeration system the:

water pumps should be on, and the recovery compressor should be off.
system water pumps should be on, the recovery compressor should be on, and the recovery condenser water should be off.
system water pumps, the recovery compressor, and the recovery condenser water should all be on.
system water pumps should be off, and the recovery compressor should be on.

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