Daikin VRV IV W+ Series Installer And User Reference Manual

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

18 | Piping installationInstaller and user reference guide82RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1B – 2020.10The valve/pump input signal is based on a variable 2~10 V DC control output signalcoming from the outdoor unit. The valve or pump should have a linear controlcharacteristic between unit output signal and flow rate according to the examplegraph below.10%BEDCca bA50%100%2 V DC 10 V DCa Valve/pump flow rateb Unit/system flow ratec Valve/pump input signalA Maximum required flow rate (100%)B 50% of the maximum required flow rateC Minimum flow rate (see description below)D Maximum flow rate (see description below)E Hydronic flow rateFollow the design criteria below to select the correct valve for the system. Thevalve system maximum required flow rate A is a property of the supplied valve andthe 50% flow rate B is directly related to the maximum flow rate of the system.INFORMATIONSome third party valves/pumps have a maximum flow rate defined by the hardwareof the system, but a different maximum flow rate can be set to correspond with themaximum input voltage (10 V DC) The installer should ask information to the valve/pump supplier before making the selection.Design criteria1 Minimum flow rate C:Model CRWEYQ8~12 50 l/minRWEYQ14 75 l/min2 Maximum flow rate D:Model DRWEYQ8~12 120 l/minRWEYQ14 190 l/min3 Hydronic flow rate E:The value E is the design flow rate calculated by the hydronic engineer whendesigning the building system.Correct valve selection is done when following conditions are met:(B≥C) AND (E≤A≤D)For further selection requirements, refer to "19 Electrical installation" [4103].Check the minimum flow rate of the system during commissioning to ensure goodoperation.