SiMT041311E Main FunctionsFunction and Control 181.4 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 isset to automatic.The following drawing explains the principle of fan speed control for cooling.In heating operation, the fan speed is regulated according to the indoor heat exchangertemperature and the difference between the room thermistor temperature and the targettemperature.Indoor Unit QuietOperationForced dropping of the fan tap decreases the airflow rate and reduces airflow noise. (Noise isreduced by about 3 dB as compared to that in L tap.)Note Airflow rate can not be set. Since the performance is lowered as compared to that in normal operation (70% under ratedconditions), the room may not be cooled or heated when this operation is used for a longtime. Indoor unit quiet operation is kept in memory even when the power supply is turned OFF.The indication remains on the display of the wireless remote controller and the indoor unitquiet operation works when the power is turned ON again.Step Cooling HeatingLLLLLLMLMMHHHH (POWERFUL) (R11681) (R6834)(R19668)Fan speed+2°C+1°C0°CMHMMLLRoom thermistor temperature – target temperature+3°C
