Question 173Refrigeration & AC - 1st Asst/Chief

The correct answer is D) liquid refrigerant returning to the compressor. When a refrigeration compressor crankcase is sweating or frosting and operating with an unusual noise, it is most likely due to liquid refrigerant returning to the compressor. This can happen when there is excessive refrigerant in the system, which causes liquid to flood back to the compressor, leading to abnormal operating conditions, noises, and potential damage to the compressor. The other answer choices are incorrect because: A) short cycling would not cause sweating/frosting, B) continuous running alone would not cause these symptoms, and C) a shortage of refrigerant would not lead to liquid returning to the compressor.