Daikin VRV IV W+ Series Installer And User Reference Manual

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18 | Piping installationInstaller and user reference guide99RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1B – 2020.10If Then4b The total amount of refrigerantcould not be charged by pre-chargingClose valve B, disconnect themanifold from the liquid line, andperform steps 5~6.INFORMATIONIf the total additional refrigerant amount was reached in step 4 (by pre-chargingonly), record the amount of refrigerant that was added on the additional refrigerantcharge label provided with the unit and attach it on the back side of the front panel.Perform the test procedure as described in "21 Commissioning" [4128].Charging refrigerant5 After pre-charging, connect valve A to the refrigerant charge port and chargethe remaining additional refrigerant through this port. Open all outdoor unitstop valves. At this point, valve A must remain closed!p< p>R410Aa cdbAa Weighing scalesb Refrigerant R410A tank (siphon system)c Vacuum pumpd Refrigerant charge portA Valve AINFORMATIONFor a multi outdoor unit system, it is not required to connect all charge ports to arefrigerant tank.The refrigerant will be charged with ±22 kg in 1 hour time at an outdoor temperatureof 30°C DB or with ±6 kg at an outdoor temperature of 0°C DB.If you need to speed up in case of a multiple outdoor system, connect the refrigeranttanks to each outdoor unit.NOTICE▪ The refrigerant charging port is connected to the piping inside the unit. The unit'sinternal piping is already factory charged with refrigerant, so be careful whenconnecting the charge hose.▪ After adding the refrigerant, do not forget to close the lid of the refrigerantcharging port. The tightening torque for the lid is 11.5 to 13.9 N•m.▪ In order to ensure uniform refrigerant distribution, it may take the compressor±10 minutes to start up after the unit has started operation. This is not amalfunction.The remaining additional refrigerant charge can be charged by operating theoutdoor unit by means of the manual refrigerant charge operation mode:6 Take all the precautions mentioned in "20 Configuration" [4 116] and"21 Commissioning" [4128] into account.7 Turn on the power of the indoor units and outdoor unit.