Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration GS-RA-42 Illustration GS-RA-42: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option A — The duct thermostat determines the amount of water flow circulating through the cooling coil.

In chilled water HVAC configurations, the space or duct thermostat modulates control valves regulating chilled water flow through the cooling coil, directly governing thermal exchange capacity to maintain designated environmental setpoints.