31 Fan Coil FC600 Instruction ManualTap on fan icon. Choose fan speedTap the fan icon on your App screenand a sub-menu with fan speeds(1-3, Auto and Off ) will appear. Makeyour selection.By default, the Fan is on only when the Fan Coil calls for heating or cooling. You can change the default settingby changing parameter d38 in Installer Mode. On details regarding the installer mode, please check page 49.In program mode, the default fan mode is automatic. The fan mode can be changed to Manual by pressing theFan button. The fan returns to the automatic default mode until next program time.The fan is controlled by the TPI method. TPI is a learning algorithm for the fan. It tells the fan in which speed ithas to run in order to be most economy efficient. Not that it only sets the speed depending on the differencebetween the room temperature and the set point temperature, it also figures out the thermo patterns in yourhouse/office to result into the best energy saving plan.3. 7 Fan ControlThe application gives you the possibility to lock the keys on your device. Simply tap the lock icon on thescreen to lock. To unlock, tap it again. When the keys are locked, the user can't press any keys on the device.Tap lock icon. Thermostat locked. Tap tounlock.Thermostat unlocked.3.8 Key lock functionYou can also change the key lock settings in parameter settings, by changing the d37 value in Installer Mode.Please check page 51.