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 B — the suction line will be abnormally cold and liquid may flood back to the compressor

An excessively low superheat setting keeps the thermal expansion valve too wide open. Liquid refrigerant fails to fully boil off in the evaporator, resulting in abnormally cold suction lines and dangerous liquid flood-back into the compressor cylinders.