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 manual26RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1D – 2020.10NOTICEBefore starting charging procedures, check if the7‑segment display indication of the outdoor unit A1P PCBis as normal (see "16.1.4 To access mode 1 or 2" [433]).If a malfunction code is present, see "18.1 Solvingproblems based on error codes" [436].NOTICEClose the front panel before any refrigerant chargeoperation is executed. Without the front panel attached theunit cannot judge correctly whether it is operating properlyor not.14.5.2 About charging refrigerantThe outdoor unit is factory charged with refrigerant, but dependingon the field piping you have to charge additional refrigerant.Make sure the outdoor unit's external refrigerant piping is checked(leak test, vacuum drying).Charging additional refrigerant typically consists of the followingstages:1 Determining how much you have to charge additionally.2 Charging additional refrigerant (pre-charging and/or charging).3 Filling in the fluorinated greenhouse gases label, and fixing it tothe inside of the outdoor unit.14.5.3 To determine the additional refrigerantamountINFORMATIONFor final charge adjustment in the test laboratory, pleasecontact your local dealer.NOTICEThe refrigerant charge of the system must be less than100 kg. This means that in case the calculated totalrefrigerant charge is equal to or more than 95 kg you mustdivide your multiple outdoor system into smallerindependent systems, each containing less than 95 kgrefrigerant charge. For factory charge, refer to the unitname plate.In case of heat pump systemFormula:R=[(X1×Ø22.2)×0.37+(X2×Ø19.1)×0.26+(X3×Ø15.9)×0.18+(X4×Ø12.7)×0.12+(X5×Ø9.5)×0.059+(X6×Ø6.4)×0.022]+AR Additional refrigerant to be charged [in kg and rounded offto 1 decimal place]X1...6 Total length [m] of liquid piping size at ØaA Parameter AParameter A. If the total indoor unit capacity connection ratio(CR)>100%, charge an additional 0.5 kg of refrigerant per outdoorunit.In case of heat recovery systemFormula:R=[(X1×Ø22.2)×0.37+(X2×Ø19.1)×0.26+(X3×Ø15.9)×0.18+(X4×Ø12.7)×0.12+(X5×Ø9.5)×0.059+(X6×Ø6.4)×0.022]×1.04+A+CR Additional refrigerant to be charged [in kg and rounded offto 1 decimal place]X1...6 Total length [m] of liquid piping size at ØaA Parameter AC Parameter CParameter A. If the total indoor unit capacity connection ratio(CR)>100%, charge an additional 0.5 kg of refrigerant per outdoorunit.Parameter C. When using more than one multi BS unit, add the sumof the individual BS unit charge factors.Model CBS1Q10 0.05 kgBS1Q16 0.1 kgBS1Q25 0.2 kgBS4Q 0.3 kgBS6Q 0.4 kgBS8Q 0.5 kgBS10Q 0.7 kgBS12Q 0.8 kgBS16Q 1.1 kgMetric piping. When using metric piping, replace the weight factorsin the formula by the ones from the following table:Inch piping Metric pipingPiping Weight factor Piping Weight factorØ6.4 mm 0.022 Ø6 mm 0.018Ø9.5 mm 0.059 Ø10 mm 0.065Ø12.7 mm 0.12 Ø12 mm 0.097Ø15.9 mm 0.18 Ø15 mm 0.16Ø16 mm 0.18Ø19.1 mm 0.26 Ø18 mm 0.24Ø22.2 mm 0.37 Ø22 mm 0.3514.5.4 To charge refrigerantFollow the steps as described below.Pre-charging refrigerant1 Calculate the additional amount of refrigerant to be added usingthe formula mentioned in "14.5.3 To determine the additionalrefrigerant amount" [426].2 The first 10 kg of additional refrigerant can be pre-chargedwithout outdoor unit operation:If ThenThe additional refrigerant amountis smaller than 10 kgPerform steps 3~4.The additional refrigerant chargeis larger than 10 kgPerform steps 3~6.3 Pre-charging can be done without compressor operation, byconnecting the refrigerant bottle to the service port of the liquidstop valve (open valve B). Make sure that all outdoor unit stopvalves, as well as valves A, C, and D are closed.NOTICEDuring pre-charging, the refrigerant is charged through theliquid line only. Close valves C, D, and A and disconnectthe manifold from the gas line and the high pressure/lowpressure gas line.p< p>R410AN2C (1) Db c eaghfdA Ba Pressure reducing valveb Nitrogenc Weighing scalesd Refrigerant R410A tank (siphon system)e Vacuum pumpf Liquid line stop valveg Gas line stop valve