Main Functions SiUS091601E25 Functions and Control1.4 Fan Speed Control for Indoor UnitOutline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH.The airflow rate can be automatically controlled depending on the difference between the roomthermistor temperature and the target temperature.Automatic FanSpeed ControlIn automatic fan speed operation, the step SL is not available.= The airflow rate is automatically controlled within this range when the FAN button is set toautomatic.CoolingThe following drawing explains the principle of fan speed control for cooling.*The upper limit is M tap for 30 minutes from the operation start.HeatingIn heating operation, the fan speed is regulated according to the indoor heat exchangertemperature and the difference between the room thermistor temperature and the targettemperature.Note: The fan stops during defrost control.COMFORTAIRFLOWOperationFTX Series The fan speed is controlled automatically within the following steps.CoolingL tap ~ MH tap (same as automatic)HeatingL tap ~ M tap The latest command has the priority between POWERFUL and COMFORT AIRFLOW.Step Cooling HeatingLLLLLLMLMMHHHH (POWERFUL) (R11681) (R6834)(R21654)Fan speed+2.5°C (+4.5°F)+1.5°C (+2.7°F)+0.5°C (+0.9°F)MH*MMLL+3°C (+5.4°F)+2°C (+3.6°F)+1°C (+1.8°F)Room thermistor temperature – target temperature
