Question 190Refrigeration & AC - 1st Asst/Chief
70% to passA thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the evaporator superheat setting will result in which of the following?
Athe expansion valve will further close
Bthe expansion valve diaphragm will rupture
Cthe evaporator pressure will decrease
Dthe evaporator feed will increase
AI Explanation
The correct answer is D) the evaporator feed will increase. Adjusting the thermostatic expansion valve to lower the evaporator superheat setting will cause the valve to open further, allowing more refrigerant to flow into the evaporator. This increased refrigerant flow will result in a higher evaporator feed, which is the correct answer. The other options are incorrect because: A) the valve will open further, not close; B) lowering the superheat setting will not cause the diaphragm to rupture; and C) decreasing the superheat setting will increase the evaporator pressure, not decrease it.
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