Question 129Refrigeration & AC - Assistant Engineer

The correct answer is D) noisy compressor operation upon starting. When a refrigeration system with a reciprocating compressor has a leaking liquid-line solenoid valve during the 'off' cycle, it can cause refrigerant to slowly flow back into the compressor. This refrigerant can then result in a 'liquid slug' being drawn into the compressor upon the next startup, leading to noisy and potentially damaging compressor operation. The other options are incorrect because a leaking liquid-line solenoid valve would not directly cause refrigerant slugs in the receiver (A), high superheat in the outlet coil (B), or low suction pressure (C). The key issue is the potential for liquid refrigerant to flood back into the compressor, which can lead to the noisy startup described in the correct answer (D).