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?

Correct Answer: Option C — the suction line will be abnormally cold and liquid may flood back to the compressor

Setting the TXV superheat too low causes excessive refrigerant feed into the evaporator, incomplete vaporization, abnormally cold suction lines, and severe liquid flood-back, which can catastrophically damage compressor valves.