Question 19Refrigeration/AC - Assistant Engineer70% to pass
An obstructed expansion valve may be indicated by an incompletely cooled evaporator and what other symptom?
AI Explanation
The correct answer is A) frosting at the evaporator inlet.
An obstructed expansion valve can cause incomplete cooling of the evaporator, leading to frosting at the evaporator inlet. This is because the expansion valve controls the flow of refrigerant into the evaporator, and an obstruction can prevent the proper amount of refrigerant from entering, resulting in an incompletely cooled evaporator.
The other options are incorrect because: B) a higher than normal discharge pressure is associated with a restricted condenser, not an obstructed expansion valve; C) a decrease in the amount of frosting across the drier is not a symptom of an obstructed expansion valve; and D) frosting at the suction side of the compressor is not a typical symptom of an obstructed expansion valve.
Related Questions
#17 Moisture entering a typical refrigeration system will most likely produce what effect? #18 A small obstruction at the thermostatic expansion valve inlet will result in which of the following conditions? #20 Which of the following conditions will occur if the power element of the thermostatic expansion valve shown in the illustration loses its charge? Illustration GS-RA-07 #21 If the needle and seat assembly is excessively eroded, the valve cage assembly can be replaced. In replacing the original valve cage assembly rated at 1/2 tons, what would be the result if the replacement valve cage was oversized at 5 tons? Illustration GS-RA-07 #22 If the superheat value of the thermostatic expansion valve is adjusted too high, what would be the result?