Question 199Refrigeration & AC - Assistant Engineer

The correct answer is C) to prevent the damaging effects of liquid slugging. Hot gas defrost systems reheat the refrigerant just prior to its returning to the compressor in order to prevent liquid slugging. Liquid slugging occurs when liquid refrigerant enters the compressor instead of vapor, which can damage the compressor's valves and other components. Reheating the refrigerant ensures it is in a vapor state before it enters the compressor, protecting the system from the harmful effects of liquid slugging. The other answer choices are incorrect because: A) reheating does not specifically protect the compressor suction valves, B) it does not improve the efficiency of the expansion valve, and D) it does not increase the circulation of liquid refrigerant (in fact, it prevents liquid refrigerant from entering the compressor).