Question 108Refrigeration & AC - QMED

The correct answer is A) the evaporator coil will tend to excessively frost. When there is an abnormally large difference between the evaporator refrigerant temperature and the box air temperature, it causes the evaporator coil to become overcooled. This leads to excessive frost buildup on the coil, which reduces the airflow and heat transfer efficiency of the refrigeration system. The other options are incorrect because an abnormally large temperature difference does not directly cause the box temperature to be pulled down too low, the compressor to trip out on high head pressure, or the compressor to overheat due to high suction temperature.