UM / UM PLUS Chillers and inverter air / water heat pumps with axial fans3821 REMOTE CONTROL (OPTIONAL ACCESSORY)The Remote Control allows you to set the operating mode of the chiller and fan coils units connected to a RS485 network. Thenetwork can consist of up to 5 chillers in cascade and fan coils up to 70 units in 9 heating zones. The keyboard can be fitted ontothe E503 built-in wall boxes.21.1 CONNECTION OF THE REMOTE CONTROL TO THE MINICHILLER5: to connect to the reference GNDR terminal of the output terminal block of the unit;6: to connect to R- output terminal of the output terminal block of the unit;7: to connect to R+ output terminal of the output terminal block of the unit;8: to connect to 12V- output terminal of the output terminal block of the unit;9: to connect to 12V+ output terminal of the output terminal block of the unit.For more informations, please see the manual of the remote control device.