Question 91Refrigeration & AC - Assistant Engineer

The correct answer is D) The duct thermostat determines the amount of water flow circulating through the cooling coil. In a class "D" air conditioning system, the duct thermostat controls the temperature of the air exiting the cooling coil by regulating the amount of water flowing through the coil. This allows the system to maintain the desired temperature in the conditioned space. The other answer choices are incorrect - option A is about recirculated air, which is not directly related to the cooling coil; option B is about wet bulb temperature, which is not the control parameter in this type of system; and option C describes a direct expansion cooling system, which is different from the water-cooled system depicted in the illustration.