Daikin VRV IV W+ Series Installer And User Reference Manual

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18 | Piping installationInstaller and user reference guide98RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1B – 2020.1018.5.4 To charge refrigerantFollow the steps as described below.Pre-charging refrigerant1 Calculate the additional amount of refrigerant to be added using the formulamentioned in "18.5.3 To determine the additional refrigerant amount" [496].2 The first 10 kg of additional refrigerant can be pre-charged without outdoorunit operation:If ThenThe additional refrigerant amount issmaller than 10 kgPerform steps 3~4.The additional refrigerant charge islarger than 10 kgPerform steps 3~6.3 Pre-charging can be done without compressor operation, by connecting therefrigerant bottle to the service port of the liquid stop valve (open valve B).Make sure that all outdoor unit stop valves, as well as valves A, C, and D areclosed.NOTICEDuring pre-charging, the refrigerant is charged through the liquid line only. Closevalves C, D, and A and disconnect the manifold from the gas line and the highpressure/low pressure 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 valveh High pressure/low pressure gas line stop valveA Valve AB Valve BC Valve C(1)D Valve D(1) Only for heat recovery system.NOTICEDo not connect the vacuum pump to the suction gas stop valve if the unit is intendedto run as a heat pump system. This will increase the risk of unit failure.4 Do one of the following:If Then4a The calculated additionalrefrigerant amount is reached byabove pre-charging procedureClose valve B and disconnect themanifold from the liquid line.