Question 39Refrigeration & AC - QMED

The correct answer is C) they should be purged with refrigerant. When charging a refrigeration unit, the refrigerant charging hoses should be purged with refrigerant before connecting them to the system. This is done to remove any air or contaminants that may be present in the hoses, which could otherwise be introduced into the refrigeration system and cause damage or impair its performance. Purging the hoses with refrigerant ensures that only the proper refrigerant is being charged into the system. The other options are incorrect because: A) flushing with oil would not remove air or contaminants, B) cleaning with carbon tetrachloride is an outdated and potentially hazardous practice, and D) warming the hoses in an oven would not effectively purge them of air or contaminants.