Daikin VRV IV-S RXYSQ6TMYFK Installation And Operation Manual

12 OperationInstallation and operation manual32RXYSQ6TMYFKVRV IV-S system air conditioner4P524881-1 – 2018.02into defrost operation to be able to remove frost from the outdoorunit’s coil. During defrost operation the heating capacity on theindoor unit side will temporarily drop until defrosting is completed.After defrosting, the unit will regain its full heating capacity.The indoor unit will stop fan operation, the refrigerant cycle willreverse and energy from inside the building will be used to defrostthe outdoor unit coil.The indoor unit will indicate defrost operation on the display .Hot startIn order to prevent cold air from blowing out of an indoor unit at thestart of heating operation, the indoor fan is automatically stopped.The display of the user interface shows . It may take sometime before the fan starts. This is not a malfunction.12.2.4 To operate the system1 Press the operation mode selector button on the user interfaceseveral times and select the operation mode of your choice.Cooling operationHeating operationFan only operation2 Press the ON/OFF button on the user interface.Result: The operation lamp lights up and the system startsoperating.12.3 Using the dry program12.3.1 About the dry program▪ The function of this program is to decrease the humidity in yourroom with minimal temperature decrease (minimal room cooling).▪ The micro computer automatically determines temperature andfan speed (cannot be set by the user interface).▪ The system does not go into operation if the room temperature islow (<20°C).12.3.2 To use the dry programTo start1 Press the operation mode selector button on the user interfaceseveral times and select (program dry operation).2 Press the ON/OFF button of the user interface.Result: The operation lamp lights up and the system startsoperating.3 Press the air flow direction adjust button (only for double-flow,multi-flow, corner, ceiling-suspended and wall-mounted). Referto "12.4 Adjusting the air flow direction" on page 32 for details.To stop4 Press the ON/OFF button on the user interface once again.Result: The operation lamp goes out and the system stopsoperating.NOTICEDo not turn off power immediately after the unit stops, butwait for at least 5 minutes.12.4 Adjusting the air flow directionRefer to the operation manual of the user interface.12.4.1 About the air flow flapDouble flow+multi-flow unitsCorner unitsCeiling suspended unitsWall-mounted unitsFor the following conditions, a micro computer controls the air flowdirection which may be different from the display.Cooling Heating▪ When the room temperature islower than the settemperature.▪ When starting operation.▪ When the room temperature ishigher than the settemperature.▪ At defrost operation.▪ When operating continuously at horizontal air flow direction.▪ When continuous operation with downward air flow is performedat the time of cooling with a ceiling-suspended or a wall-mountedunit, the micro computer may control the flow direction, and thenthe user interface indication will also change.The air flow direction can be adjusted in one of the following ways:▪ The air flow flap itself adjusts its position.▪ The air flow direction can be fixed by the user.▪ Automatic and desired position .WARNINGNever touch the air outlet or the horizontal blades while theswing flap is in operation. Fingers may become caught orthe unit may break down.NOTICE▪ The movable limit of the flap is changeable. Contactyour dealer for details. (only for double-flow, multi-flow,corner, ceiling-suspended and wall-mounted).▪ Avoid operating in the horizontal direction . It maycause dew or dust to settle on the ceiling or flap.12.5 Setting the master user interface12.5.1 About setting the master user interfaced dc cbaa VRV IV-S Heat pump outdoor unitb Refrigerant pipingc VRV direct expansion (DX) indoor unitd User interface (dedicated depending on indoor unit type)When the system is installed as shown in the figure above, it isnecessary to designate one of the user interfaces as the master userinterface.