Question 159Refrigeration & AC - Assistant Engineer

The correct answer is A) prevent liquid slugging or overloading the compressor. When a refrigeration system has been shut down for an extended period, refrigerant and oil can accumulate in the cold parts of the system. Suddenly starting the compressor can pull this liquid refrigerant and oil into the compressor, which can cause liquid slugging and overload the compressor. Running the compressor in short intermittent spurts or throttling the suction isolation valve allows the system to gradually build up suction pressure and circulate the refrigerant, preventing liquid slugging and protecting the compressor. The other options are incorrect because: B) is not the primary purpose, C) is a secondary benefit, and D) is unrelated to the startup procedure.