Question 136Refrigeration & AC - Assistant Engineer

The correct answer is A) the expansion valve strainers were fouled. When the refrigeration compressor is short cycling on the low-pressure cutout switch, it is most likely due to a restriction in the system, preventing adequate refrigerant flow. The expansion valve strainers are a common point of restriction, as they can become clogged with debris, causing the pressure to drop and triggering the low-pressure cutout switch. The other options are less likely causes: B) the suction valves leaking slightly would not cause the compressor to short cycle; C) the high-pressure switch being improperly adjusted would affect the high-pressure side, not the low-pressure side; and D) an overcharge of refrigerant would typically cause high-pressure issues, not low-pressure cycling.