Question 46Refrigeration & AC - QMED

The correct answer is C) The expansion valve would hunt excessively, alternately starving and overfeeding the evaporator coil. If the replacement valve cage assembly is oversized at 5 tons compared to the original 1/2 ton rating, the expansion valve would not be able to properly control the refrigerant flow. The larger capacity valve cage would cause the expansion valve to constantly oscillate between starving and overfeeding the evaporator coil, resulting in excessive hunting behavior. This would lead to inconsistent superheat levels and poor system performance. The other options are incorrect because: A) The evaporator would not be starved, but rather would experience alternating starvation and overfeed conditions. B) The expansion valve would not function normally with the oversized valve cage. D) The evaporator would experience both insufficient and excessive superheat, not consistently insufficient superheat.