Question 22Refrigeration/AC - Assistant Engineer70% to pass
If the superheat value of the thermostatic expansion valve is adjusted too high, what would be the result?
AI Explanation
The correct answer is A) the suction line of the compressor will be abnormally warm.
If the superheat value of the thermostatic expansion valve is adjusted too high, it will cause the valve to open less, resulting in an over-feeding of the evaporator with liquid refrigerant. This excess liquid refrigerant in the evaporator will not be fully vaporized, leading to a lower temperature in the evaporator. As a result, the suction line of the compressor will be abnormally warm as it pulls in a mixture of liquid and vapor refrigerant, rather than just superheated vapor.
The other options are incorrect because: B) the heat removal capacity of the evaporator would actually decrease due to the over-feeding, C) the suction line would be abnormally cold if the superheat was too low, and D) the evaporator being overfed is the cause, not the result, of the issue.
Related Questions
#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 #23 If the superheat setting of a thermostatic expansion valve is set too low, what would be the result, assuming that the system has a single evaporator? #24 Which of the illustrated valves is used to gain access to a hermetic system and features a Schrader core valve which is unseated by the core depressor of hose fitting when attached? Illustration GS-RA-69 #25 How should small appliances with less than three pounds of refrigerant be charged with refrigerant?