Daikin RWEYQ8T9Y1B Installation And Operation Manual

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

Contents

4 PreparationInstallation and operation manual12RWEYQ8~14T9V1B+RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1A – 2017.04To activate the variable flow system, change field setting [2-24] tothe applicable value. See "6.1 Making field settings" on page 23.NOTICEMake sure that all field supplied equipment for variableflow rate can be switched off together with the outdoor unit.This is required when cleaning the plate heat exchanger.NOTICEMake sure that all field supplied equipment for variableflow rate meet the minimum hydronic and electricspecifications. Failure to do so can result in inefficientoperation or even breakdown of the system.Size the valve (b) or pump (c) in accordance with the maximumrequired flow rate A, calculated by the installer of the hydronicsystem (with respect to the operation range of the outdoor unit). Thetypical operation range of the flow rate of the valve/pump is 50% (B)to 100% (A).The valve/pump input signal is based on a variable 2~10 V DCcontrol output signal coming from the outdoor unit. The valve orpump should have a linear control characteristic between unit outputsignal and flow rate according to the example graph below.0%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 thesystem. The valve system maximum required flow rate A is aproperty of the supplied valve and the 50% flow rate B is directlyrelated to the maximum flow rate of the system.INFORMATIONSome third party valves/pumps have a maximum flow ratedefined by the hardware of the system, but a differentmaximum flow rate can be set to correspond with themaximum input voltage (10 V DC) The installer should askinformation to the valve/pump supplier before making theselection.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 hydronicengineer when designing 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 "4.4 Preparing electricalwiring" on page 12.Check the minimum flow rate of the system during commissioning toensure good operation.During the initialization process of the outdoor unit, the output signalwill trigger a flow rate of B (50%). The installer should make surethat a flow rate can be checked in the individual hydronic system ofeach unit. If this value is not matching the required flow, the installershould troubleshoot the hydronic system to solve the problem andensure the correct flow rate.4.4 Preparing electrical wiring4.4.1 Safety device requirementsThe power supply must be protected with the required safetydevices, i.e. a main switch, a slow blow fuse on each phase and anearth leakage protector in accordance with the applicable legislation.For single modelsSelection and sizing of the wiring should be done in accordance withthe applicable legislation based on the information mentioned in thetable below.Model MinimumcircuitampacityRecommendedfusesRWEYQ8~14T9 22.3 A 25 AFor all models:▪ Phase and frequency: 3N~ 50 Hz▪ Voltage: 380~415 V▪ Transmission line section: 0.75~1.25 mm2, maximum length is1000 m. If the total transmission wiring exceeds these limits, itmay result in communication error.For free combinationsCalculate the recommended fuse capacity.Formula Calculate, by adding the minimum circuit amps of eachused unit (according to the table above), multiply theresult by 1.1 and select the next higher recommendedfuse capacity.Example Combining the RWEYQ30T9 by using the RWEYQ8T9,RWEYQ10T9, and RWEYQ12T9.▪ Minimum circuit ampacity of the RWEYQ8T9=16.1 A▪ Minimum circuit ampacity of theRWEYQ10T9=22.0 A▪ Minimum circuit ampacity of theRWEYQ12T9=24.0 AAccordingly, the minimum circuit ampacity of theRWEYQ30T9=16.1+22.0+24.0=62.1 AMultiply the above result by 1.1 ⇒ (62.1×1.1)=68.31 A⇒ the recommended fuse capacity would be 80 A.NOTICEWhen using residual current operated circuit breakers, besure to use a high-speed type 300 mA rated residualoperating current.