Question 26Refrigeration & AC - Assistant Engineer

The correct answer is B) they should be purged with refrigerant. Before charging a refrigeration unit, the refrigerant charging hoses should be purged with refrigerant to remove any air or contaminants that may be present. This is done to prevent air or moisture from entering the refrigeration system, which could lead to issues such as reduced efficiency, corrosion, or even damage to the compressor. Purging the hoses with refrigerant ensures that the system is properly charged with the correct type and amount of refrigerant. The other options are incorrect because: A) Cleaning the hoses with carbon tetrachloride is not a recommended practice, as it can leave residues that are harmful to the system. C) Flushing the hoses with clean refrigerant oil is not necessary before charging the system. D) Warming the hoses in an oven would not effectively remove any contaminants or air from the hoses.