4 About the units and optionsInstaller and user reference guide9RWEYQ8~14T9V1B + RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1 – 2017.0422351(12.3 N·m)4 About the units and options4.1 Overview: About the units andoptionsThis chapter contains information about:▪ Identification of the outdoor unit▪ Where the outdoor unit fits in the system layout▪ With which indoor units and options you can combine the outdoorunits▪ Which outdoor units have to be used as standalone units, andwhich outdoor units can be combined4.2 Identification label: Outdoor unitLocationModel identificationExample: RW E Y Q 8 T9 Y1 B [*]Code ExplanationRW Water-cooledE Heat pump systemY Heat recovery systemQ Refrigerant R410A8 Capacity classT9 Model seriesY1 Power supplyB European market[*] Minor model change indication4.3 About the outdoor unitThis installation manual concerns the VRV IV water-cooled systemair conditioner. The unit is full inverter driven, and can be used forcooling, heat pump and heat recovery applications.Model line up:Model DescriptionRWEYQ8~14 Heat recovery model for single or multi-useDepending on the chosen type of unit, some functionality will or willnot exist. It will be indicated throughout this installation manual andbrought to your attention. Certain features have exclusive modelrights.These units are intended for indoor installation and aimed for heatpump applications including water to air and water to waterapplications.These units have (in single use) heating capacities ranging from 25to 45 kW and cooling capacities ranging from 22.4 to 40 kW. Whenmulti combination is used, the capacity can go up to 135 kW forheating and 120 kW for cooling.The unit is designed to work in heating mode at indoor temperaturesfrom 15°C WB to 27°C WB and in cooling mode at indoortemperatures from 21°C DB to 32°C DB or 14°C WB to 25°C WB.The ambient temperature around the unit should be above 0°C DBand below 40°C DB. Relative humidity around the unit should bebelow 80%.The water temperature at the water inlet of the unit must be between10°C and 45°C. The lower limit is extendable down to –10°C(heating operation mode) in case the brine type setting [2‑50] is setfor use with brine as heat source medium.4.4 System layoutINFORMATIONNot all combinations of indoor units are allowed, forguidance, see "4.5.2 Possible combinations of indoorunits" on page 10.