Pressure independent control valves (PICVs) improve system performance and optimize Delta-T through reliable valve control. Siemens PICVs integrate three functions into a single device and always maintain their full stroke. This reduces or eliminates hunting for the right actuator setting, resulting in better control.

A fan coil unit (FCU) is a small terminal unit that combines a fan with a heat exchanger – to generate either heating or cooling for a space. They are also known as IDUs (Indoor Units). A fan coil unit (FCU) may be used in a residential, commercial or industrial environment to cool or heat a space.

It is the job of the AC actuator to control the opening and closing of the airflow in response to the thermostat, thus controlling air controlling air movement and allowing cool air to blow down the ducts and into the house. The AC actuator is located above or below the coil. It can be set to either single speed or variable speed.