Daikin LX10F11B3 Service Manual

Contents

Daikin LX10F11B3 Service Manual Manual pdf 21 page image

1-141.4.4 Defrost ModeHot-Gas Defrost SystemA hot gas system is adopted for the heat source;I.e. the high temperature and high pressurerefrigerant discharged from the compressor issupplied to the evaporator and drain pan fordefrosting. Since the ice built on the evaporatoris directly and evenly heated up from the inside,defrosting can be efficiently performed.Display"DEFROST" is displayedon the upper right of thescreen.LED displayThe DEFROST indicator (orange) lights.Defrost operationThe pump-down operation is executed by closingEEV and opening DMV first.Then the defrost operation will start by closingDMV and opening HSV and hot gas is supplied tothe evaporator and drain pan. During defrosting,the compressor speed is adjusted in order tomaintain the optimum hot gas temperature. (HighPressure Constant Control). Release control(DMV open, CFM ON) or charge control (ESV and,EMV open) may be carried out depending on theoperating conditions. After termination of defrosting,normal temperature control operation will start.However, the delay timer will cause the evaporatorfan to remain stopped for a maximum of 3 minutes.In-Range maskingThe control temperature temporarily becomes out-rage during defrosting, but the IN RANGE LED iskept ON.This will avoid misunderstanding that there will be aproblem if the IN RANGE LED is turned OFF.Defrost InitiationPull-downShort timer 6Hr12Hr when RS<-15AutomaticdetectingWhen supply air temperature does notdrop 0.2 per 1 hr in frozen mode."AUTO"In-RangeDefrostintervalsettingDefrost interval setting"3, 6, 9, 12 or 24" HrOut-rangetimerExecuted by 30 min. timerafter the control temperaturerises out of in-range.Manual Defrost Executed by Manual defrost key.Defrost Initiation ConditionsTimer Count-down Initiation ConditionsDefrost interval (Frozen)Short timerOut-range timerManual defrostEOS 20.0Defrost interval (Chilled) EOS 20.0& EIS<5.0If the initiation conditions are not satisfied whentimer counts down, the defrosting will not beinitiated. If "AUTO" is selected, defrosting will beexecuted automatically in accordance with theaccumulation of ice on the evaporator coil.Defrost Termination ConditionsDefrosting Time Termination Conditions45 minuteEOS 20& (RS 5 or RS 5 with 10 min.elapse if RS<-20 at defrost initiation)45 minuteEOS 25& (RS 15 or RS 5 with 10 min.elapse if RS<-20 at defrost initiation)90 minute Defrost is forcibly terminated at90 minutes. (E207EconomizerReheat coil (option)CondenserReceiverCompressorHPTHPSEMVESVLSV DryerEEVLPTSight glassEvaporatorCFMEFMRSVHSV PRVDMVhttps://daikin-p.ru