Main Functions Si04-402A20 Function and Control1.4 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 77.Phase Steps Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.= Within this range the airflow rate is automatically controlled when the FAN settingbutton is set to automatic.Note: 1. During powerful operation, fan operates H tap + 50 - 70 rpm.2. Fan stops during defrost operation.Automatic AirFlow Control forHeatingThe following drawing explains the principle for fan speed control for heating:Automatic AirFlow Control forCoolingThe following drawing explains the principle of fan speed control for cooling:Step Cooling Heating Dry modeLLL (Heating thermostat OFF)25/35kW class :830 - 980 rpm(During powerful operation :1030 rpm)LL (Cooling thermostat OFF)SL (Silent)LMLMMHHHH (Powerful)(R4085) (R4085)-1.5˚C0˚C-0.5˚C-2˚CLMLMThermostatsettingtemperaturePhase controlDifference between roomand set temperaturefan speed (R3299)+1.5˚C+2.5˚C+0.5˚C+2˚C+3˚C+1˚CMMLMHLfan speedDifference between roomand set temperaturePhase controlThermostatsettingtemperature (R3300)
