Daikin RWEYQ8T9Y1B Installer And User Manual

Also see for RWEYQ10T9Y1B: Installation and operation manual Installer and user reference guide Installation and operation manual

16 OperationInstaller and user reference guide48RWEYQ8~14T9V1B + RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1 – 2017.04▪ Fan only operation (air to air).▪ Heating and cooling (air to water).▪ Domestic hot water operationDedicated functions exist depending on the type of indoor unit, referto dedicated installation/operation manual for more information.16 Operation16.1 Operation rangeUse the system in the following temperature and humidity ranges forsafe and effective operation.Above operation range is only valid in case direct expansion indoorunits are connected to the VRV IV system.Special operation ranges are valid in case of using Hydrobox units orAHU. They can be found in the installation/operation manual of thededicated unit. Latest information can be found in the technicalengineering data.16.2 Operating the system16.2.1 About operating the system▪ Operation procedure varies according to the combination ofoutdoor unit and user interface.▪ To protect the unit, turn on the main power switch 6 hours beforeoperation.▪ If the main power supply is turned off during operation, operationwill restart automatically after the power turns back on again.16.2.2 About cooling, heating, fan only, andautomatic operation▪ Changeover cannot be made with a user interface whose displayshows "change-over under centralised control" (refer toinstallation and operation manual of the user interface).▪ When the display "change-over under centralised control"flashes, refer to "16.5.1 About setting the master userinterface" on page 50.▪ The fan may keep on running for about 1 minute after the heatingoperation stops.▪ The air flow rate may adjust itself depending on the roomtemperature or the fan may stop immediately. This is not amalfunction.16.2.3 About the heating operationIt may take longer to reach the set temperature for general heatingoperation than for cooling operation.The following operation is performed in order to prevent the heatingcapacity from dropping or cold air from blowing.Defrost operationIn heating operation, freezing of the outdoor unit's air cooled coilincreases over time, restricting the energy transfer to the outdoorunit's coil. Heating capability decreases and the system needs to gointo defrost operation to be able to deliver enough heat to the indoorunits.In case of ThenRWEYQ16~42 multi-modelsThe indoor unit will continue heatingoperation at a reduced level during defrostoperation. It will guarantee a decent comfortlevel indoor.In case of ThenRWEYQ8~14 singlemodelsThe indoor unit will stop fan operation, therefrigerant cycle will reverse and energyfrom inside the building will be used todefrost the 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.INFORMATION▪ The heating capacity drops when the outsidetemperature falls. If this happens, use another heatingdevice together with the unit. (When using together withappliances that produce open fire, ventilate the roomconstantly). Do not place appliances that produce openfire in places exposed to the air flow from the unit orunder the unit.▪ It takes some time to heat up the room from the timethe unit is started since the unit uses a hot-aircirculating system to heat the entire room.▪ If the hot air rises to the ceiling, leaving the area abovethe floor cold, we recommend that you use thecirculator (the indoor fan for circulating air). Contactyour dealer for details.16.2.4 To operate the system (WITHOUT cool/heat changeover remote control switch)1 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.16.2.5 To operate the system (WITH cool/heatchangeover remote control switch)Overview of the changeover remote control switchaba FAN ONLY/AIR CONDITIONINGSELECTOR SWITCHSet the switch to for fan onlyoperation or to for heating orcooling operation.b COOL/HEAT CHANGEOVER SWITCHSet the switch to for cooling or tofor heatingTo start1 Select operation mode with the cool/heat changeover switch asfollows: