Daikin VRV IV-S RXYSQ6TMYFK Installation And Operation Manual

10 About the systemInstallation and operation manual31RXYSQ6TMYFKVRV IV-S system air conditioner4P524881-1 – 2018.02For the user10 About the systemThe indoor unit part of VRV IV-S heat pump system can be used forheating/cooling applications. The type of indoor unit which can beused depends on the outdoor units series.NOTICEDo NOT use the system for other purposes. In order toavoid any quality deterioration, do NOT use the unit forcooling precision instruments, food, plants, animals, orworks of art.NOTICEFor future modifications or expansions of your system:A full overview of allowable combinations (for futuresystem extensions) is available in technical engineeringdata and should be consulted. Contact your installer toreceive more information and professional advice.INFORMATIONCombination of RA DX and aircurtain indoor units is notallowed.10.1 System layoutd 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)11 User interfaceCAUTION▪ NEVER touch the internal parts of the controller.▪ Do NOT remove the front panel. Some parts inside aredangerous to touch and appliance problems mayhappen. For checking and adjusting the internal parts,contact your dealer.This operation manual will give a non-exhaustive overview of themain functions of the system.Detailed information on required actions to achieve certain functionscan be found in the dedicated installation and operation manual ofthe indoor unit.Refer to the operation manual of the installed user interface.12 Operation12.1 Operation rangeUse the system in the following temperature and humidity ranges forsafe and effective operation.Cooling HeatingOutdoortemperature–5~52°C DB –20~21°C DB–20~15.5°C WBIndoortemperature21~32°C DB14~25°C WB15~27°C DBIndoor humidity ≤80%(a)(a) To avoid condensation and water dripping out of the unit. Ifthe temperature or the humidity is beyond these conditions,safety devices may be put in action and the air conditionermay not operate.Above operation range is only valid in case direct expansion indoorunits are connected to the VRV IV-S system.Special operation ranges are valid in case of using AHU. They canbe found in the installation/operation manual of the dedicated unit.Latest information can be found in the technical engineering data.12.2 Operating the system12.2.1 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.12.2.2 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 "12.5.1 About setting the master userinterface" on page 32.▪ 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.12.2.3 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 go