Question 26Refrigeration/AC - Assistant Engineer70% to pass
Before charging a refrigeration unit, unless quick disconnect fittings are used, the refrigerant charging hoses should be prepared in what way?
AI Explanation
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.
Related Questions
#24 Which of the illustrated valves is used to gain access to a hermetic system and features a Schrader core valve which is unseated by the core depressor of hose fitting when attached? Illustration GS-RA-69 #25 How should small appliances with less than three pounds of refrigerant be charged with refrigerant? #27 Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant charge? Illustration GS-RA-45 #28 Concerning the charging of refrigerant into a vapor compression refrigerating system, which of the following is true? #29 Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? Illustration GS-RA-24