Question 144Refrigeration/AC - 1st Asst/Chief70% to pass
Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration GS-RA-42
AI Explanation
The correct answer is A) The duct thermostat determines the amount of water flow circulating through the cooling coil.
In a class "D" air conditioning system, the duct thermostat monitors the temperature of the air flowing through the ductwork and controls the amount of water circulating through the cooling coil. This adjusts the cooling capacity of the system to maintain the desired temperature in the conditioned space.
The other options are incorrect because: B) The cooling is achieved through the refrigerant circuit, not a direct type air conditioning unit. C) Increasing recirculated air would increase the heat load, not decrease it. D) The room thermostat controls the dry bulb temperature, not the wet bulb temperature, of the conditioned space.
Related Questions
#142 Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system? #143 Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration GS-RA-09 #145 A room humidistat initiates the lowering of the humidity of the conditioned supply air to a space, while the actual process is accomplished by what means? #146 To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, what should be done? #147 Concerning the arrangement of equipment and associated hoses shown in the illustration, which statement is true? Illustration GS-RA-59