Question 140Refrigeration & AC - Assistant Engineer

The correct answer is B) short cycle on low-pressure cutout. With an evaporator coil accumulating excessive frost due to a failed defrost mechanism, the refrigerant flow through the coil will be restricted, leading to a drop in suction pressure. This will cause the low-pressure cutout to trip, shutting off the compressor. Once the pressure rises again, the compressor will restart, only to short cycle as the low-pressure cutout continues to activate. The other options are incorrect because: A) the compressor would not fail to start, as it is cycling on the low-pressure cutout; C) the high-pressure cutout would not be the issue, as the problem is on the low-pressure side; and D) the compressor would not run continuously, as it is being shut off by the low-pressure cutout.