Question 190Refrigeration & AC - Assistant Engineer

The correct answer is D) the expansion valve being open too wide. When the expansion valve is open too wide, it allows excessive refrigerant to flow into the evaporator. This results in a high suction pressure and a low suction temperature to the compressor. The excessive refrigerant flow causes the evaporator to become flooded, leading to the low suction temperature. The other options are incorrect because: A) An insufficiently opened expansion valve would result in low suction pressure and high suction temperature. B) The king valve is used to isolate the compressor and is not directly related to suction pressure and temperature. C) A clogged liquid-line strainer would restrict refrigerant flow and lead to low suction pressure and high suction temperature.