Question 42Refrigeration & AC - QMED

The correct answer is A) Lower than normal suction pressure. A small obstruction at the thermostatic expansion valve inlet will restrict the flow of refrigerant entering the valve, resulting in a lower than normal suction pressure. This occurs because the obstruction limits the amount of refrigerant that can pass through the valve, reducing the pressure in the suction line. The other answer choices are incorrect: B) Ice forming is not the sole cause, and an adverse condition will occur due to the reduced refrigerant flow. C) A higher than normal discharge pressure is not a direct result of the obstruction at the expansion valve inlet. D) Expansion valves are not designed to pass small foreign particles indefinitely without issue.