Question 43Refrigeration/AC - QMED70% to pass
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?
AI Explanation
The correct answer is B) the suction line will be abnormally cold and liquid may flood back to the compressor.
When the superheat setting of a thermostatic expansion valve is set too low, it causes the valve to open wider, allowing more liquid refrigerant to flow into the evaporator. This can lead to a reduction in superheat, causing the suction line to become abnormally cold and liquid refrigerant to potentially flood back to the compressor. This can damage the compressor and negatively impact the system's performance.
The other options are incorrect because: A) a reduced amount of refrigerant returning to the compressor would cause the suction line to be abnormally warm, not cold; C) a reduced amount of refrigerant returning to the compressor would cause the receiver level to be abnormally low, not high; and D) the box temperature would be too low, not "way down below the normal temperature range."
Related Questions
#41 Which of the following statements describes the accepted method for testing a thermostatic expansion valve? #42 A small obstruction at the thermostatic expansion valve inlet will result in which of the following conditions? #44 The coil temperature measured at the expansion valve sensing bulb of an operating system is 10°F. The low side pressure with the compressor running as shown on the gauge illustrated indicates 15 psig. What adjustments or changes, if any, should be made to the system? Illustration GS-RA-16 #45 If the superheat value of the thermostatic expansion valve is adjusted too high, what would be the result? #46 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