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 manual17RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1D – 2020.10Pipe Ø Temper grade of piping material≥19.1 mm 1/2H (half hard)▪ All piping lengths and distances have been taken intoconsideration (see About the piping length in the installerreference guide).▪ The pipe thickness of the refrigerant piping shall comply with theapplicable legislation. The minimal pipe thickness for R410Apiping must be in accordance with the table below.Pipe Ø Minimal thickness t6.4 mm/9.5 mm/12.7 mm 0.80 mm15.9 mm 0.99 mm19.1 mm/22.2 mm 0.80 mm28.6 mm 0.99 mm34.9 mm 1.21 mm41.3 mm 1.43 mm▪ In case the required pipe sizes (inch sizes) are not available, it isalso allowed to use other diameters (mm sizes), taken thefollowing into account:▪ Select the pipe size nearest to the required size.▪ Use the suitable adapters for the change-over from inch to mmpipes (field supply).▪ The additional refrigerant calculation has to be adjusted asmentioned in "14.5.3 To determine the additional refrigerantamount" [426].14.1.2 To select the piping sizeINFORMATIONPlease select the proper pipe sizes depending on themode of your system. There are 2 possible modes:▪ heat pump,▪ heat recovery.Determine the proper size using the following tables and referencefigure (only for indication).In case of heat pump systemA B B BCD FGEx yba31 2 4 51,2 VRV DX indoor unit3 Branch selector box (BP*)4,5 RA DX indoor unita,b Indoor branch kitx,y Outdoor multi connection kitIn case of heat recovery systemA B B BCD EEx yba431 21,2 VRV DX indoor unit3 Branch selector unit (BS*)4 Cooling only VRV indoor unitA~E Pipinga,b Indoor branch kitx,y Outdoor multi connection kitA, B, C: Piping between outdoor unit and (first)refrigerant branch kitChoose from the following table in accordance with the outdoor unittotal capacity type, connected downstream.In case of heat pump systemOutdoor unitcapacity type (HP)Piping outer diameter size (mm)Gas pipe Liquid pipe8 19.1 9.510 22.212~16 28.6 12.718~22 15.924 34.926~34 19.136~42 41.3In case of heat recovery systemOutdoor unitcapacity type (HP)Piping outer diameter size (mm)Liquid pipe Suction gaspipeHighpressure/lowpressure gaspipe8 9.5 19.1 15.910 22.2 19.112 12.7 28.614~16 22.218 15.920~22 28.624 34.926~34 19.136 41.338~42 34.9D: Piping between refrigerant branch kits orrefrigerant branch kit and BS unitChoose from the following table in accordance with the indoor unittotal capacity type, connected downstream. Do not let theconnection piping exceed the refrigerant piping size chosen by thegeneral system model name.