AD - 320 is a remote control with LCD display equipped with: radio communication up to 50 meters, 6-phase mode of operation, control of devices of 250W power, high ergonomics and comfort of use. Connecting the controller means connecting a receiver with a power outlet of 230V and the controlled device (fan, air handling unit) to the receiver's switch. The receiving-executive module is activated when it is connected with the supply network and operates all the time. The receiver's module is equipped with an executive element that controls the operation of a fan. The change of phase by means of a remote control causes the modification of the supply voltage of the controlled device. The allowed load power is 250W. The transmitter and the receiver have a fourfold two-positional switch.