Installation and operating instructions - LED Control 9EN4. Operating the system4.1 Control screens1 LEDs The LEDs show the selected fan speed.2 Arrow pointing upwards Increase fan speed.3 Eco-Mode Puts the system into heat recoverymode. The LEDs become green.4 Full-Blast-Mode Puts the system into full blast mode.The LEDs become blue.5 Arrow pointing downwards Decrease fan speed..4.2 Operating modes and menu itemsEco-ModeEvery 70 seconds, the fan changes the airflow direction, ensuring heat recovery.Full-Blast-ModeThe system runs in just one direction, allowing a room to be thoroughly ventilated. Heatrecovery is not available in this mode. In the main menu the SmartFan‘s starting directioncan be reversed through touching the Full-Blast -Mode icon.21543