Daikin VRV IV W+ Series Installation And Operation Manual

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

14 Piping installationInstallation and operation manual18RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1D – 2020.10In case of heat pump systemIndoor unit capacityindexPiping outer diameter size (mm)Gas pipe Liquid pipe<150 15.9 9.5150≤x<200 19.1200≤x<290 22.2290≤x<420 28.6 12.7420≤x<640 15.9640≤x<920 34.9 19.1≥920 41.3In case of heat recovery systemIndoor unit capacityindexPiping outer diameter size (mm)Liquid pipe Suction gaspipeHighpressure/lowpressure gaspipe<150 9.5 15.9 12.7150≤x<200 19.1 15.9200≤x<290 22.2 19.1290≤x<420 12.7 28.6420≤x<640 15.9 28.6640≤x<920 19.1 34.9≥920 41.3Example:▪ Downstream capacity for E=[capacity index of unit 1]▪ Downstream capacity for D=[capacity index of unit 1]+[capacityindex of unit 2]E: Piping between refrigerant branch kit or BS unitand indoor unitFor heat pump and heat recovery systemPipe size for direct connection to indoor unit must be the same asthe connection size of the indoor unit.15~50 12.7 6.463~140 15.9 9.5200 19.1250 22.2▪ If a size-up of the piping is required, refer to the table below.edb caa Outdoor unitb Main pipesc Increased First refrigerant branch kite Indoor unitSize upHP class Liquid piping outer diameter size (mm)8 9.5 → 12.71012+14 12.7 → 15.91618~22 15.9 → 19.12426~34 19.1 → 22.236~42F: Piping between refrigerant branch kit andbranch selector box (BP box)Heat pump system in case of single outdoor unitPipe size for direct connection on branch selector box (BP*) must bebased on the total capacity of the connected indoor units (only incase RA DX indoor units are connected).Total capacity indexof connected indoorunitsPiping outer diameter size (mm)Gas pipe Liquid pipe20~62 12.7 6.463~149 15.9 9.5150~208 19.1Example:Downstream capacity for F=[capacity index of unit 4]+[capacity indexof unit 5]G: Piping between branch selector box (BP box)and RA DX indoor unitHeat pump system in case of single outdoor unitOnly in case RA DX indoor units are connected.Indoor unit capacityindexPiping outer diameter size (mm)Gas pipe Liquid pipe20, 25, 30 9.5 6.450 12.760 9.571 15.914.1.3 To select refrigerant branch kitsRefrigerant refnetsFor piping example, refer to "14.1.2 To select the piping size" [417].▪ When using refnet joints at the first branch counted from theoutdoor unit side, choose from the following table in accordancewith the capacity of the outdoor unit (example: refnet joint a).Outdoor unitcapacity type (HP)2 pipes 3 pipes8+10 KHRQ22M29T9 KHRQ23M29T912~22 KHRQ22M64T KHRQ23M64T24~42 KHRQ22M75T KHRQ23M75T▪ For refnet joints other than the first branch (example refnet joint b),select the proper branch kit model based on the total capacityindex of all indoor units connected after the refrigerant branch.Indoor unit capacityindex2 pipes 3 pipes<200 KHRQ22M20T KHRQ23M20T200≤x<290 KHRQ22M29T9 KHRQ23M29T9290≤x<640 KHRQ22M64T KHRQ23M64T≥640 KHRQ22M75T KHRQ23M75T▪ Concerning refnet headers, choose from the following table inaccordance with the total capacity of all the indoor units connectedbelow the refnet header.Indoor unit capacityindex2 pipes 3 pipes<200 KHRQ22M29H KHRQ23M29H200≤x<290290≤x<640 KHRQ22M64H(a) KHRQ23M64H(a)≥640 KHRQ22M75H KHRQ23M75H