SiBE06-708 Main FunctionsFunction and Control 231.3 Fan Speed Control for Indoor UnitsControl Mode The airflow rate can be automatically controlled depending on the difference between the settemperature and the room temperature. This is done through phase control and Hall IC control.For more information about Hall IC, refer to the troubleshooting for fan motor on page 91.Phase Steps Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.In automatic operation, the step “SL” is not available.= The airflow rate is automatically controlled within this range when the FAN settingbutton is set to automatic.Note: 1. During powerful operation, fan operates H tap + 40 rpm.2. Fan stops during defrost operation.3. In time of thermostat OFF, the fan rotates at the following speed.Cooling: The fan keeps rotating at the set tap.Heating: The fan keeps rotating at LLL tap.Dry: The fan will stop after keeps rotating for a few minutes at LL tap.Automatic AirFlow Control forHeatingOn heating mode, the indoor fan speed will be regulated according to the indoor heat exchangertemperature and the difference between the room temperature and the required set point.Automatic AirFlow Control forCoolingThe following drawing explains the principle of fan speed control for cooling:Step Cooling HeatingLLLLLLMLMMHHHH (Powerful)(R6833) (R6834)+1.5˚C+0.5˚C+2˚C+1˚CMMLLfan speedDifference between roomand set temperaturePhase controlThermostatsettingtemperature (R2820)
