Engine_2014 : General Subjects - 3186/3524
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| When adding oil to a refrigeration system using a oil charging hand pump, what precaution must be taken? |
| A) all air is purged from the pump and hoses using clean refrigeration oil or refrigerant vapor |
| B) all air is purged from the pump and hoses using dry nitrogen |
| C) all refrigerant vapor is purged from the compressor crankcase using dry nitrogen |
| D) all refrigerant vapor is purged from the compressor crankcase using clean refrigeration oil |
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