According to hot or cold water in the fan coil, it can adjust the ambient temperature to the desired temperature.

Control valves are used to control the flow of water in heating and cooling systems. When the required heat is supplied in the surrounding environment, the control valve shuts off the flow (two-way valve) or shuts off the flow to allow the return path (three-way valve) to continue. The three-way FCU valve can be used as a separator or mixer with the help of a valve motor.

Because of its low kvs value, the switch normally closed valve is preferred.