Daikin RWEYQ8T9Y1B Installer And User Manual

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6 InstallationInstaller and user reference guide24RWEYQ8~14T9V1B + RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1 – 2017.04NOTICEPrecautions when connecting field piping. Add brazingmaterial as shown in the figure.1 1112 2≤Ø25.4 >Ø25.4NOTICE▪ Be sure to use the supplied accessory pipes whencarrying out piping work in the field.▪ Be sure that the field installed piping does not touchother pipes, the bottom panel or side panel. Especiallyfor the bottom and side connection, be sure to protectthe piping with suitable insulation, to prevent it fromcoming into contact with the casing.Connect the stop valves to the field piping using the accessory pipessupplied with the unit.The connections to the branch kits are the responsibility of theinstaller (field piping).6.4.5 To connect the multi connection piping kitNOTICEImproper installation may lead to malfunction of theoutdoor unit.▪ Install the joints horizontally, so that the caution label (a) attachedto the joint comes to the top.▪ Do not tilt the joint more than 7.5° (see view A).▪ Do not install the joint vertically (see view B).a aA B7.5°7.5°a Caution labelX Not allowedO Allowed▪ Make sure that the total length of the piping connected to the jointis absolute straight for more than 500 mm. Only if a straight fieldpiping of more than 120 mm is connected, more than 500 mm ofstraight section can be ensured.>120 mm>500 mm6.4.6 To connect the refrigerant branching kitFor installation of the refrigerant branching kit, refer to the installationmanual delivered with the kit.▪ Mount the refnet joint so that it branches either horizontally orvertically.▪ Mount the refnet header so that it branches horizontally.AB±30° ab caa Horizontal surfaceb Refnet joint mounted verticallyc Refnet joint mounted horizontally6.4.7 To protect against contaminationProtect the piping as described in the following table to prevent dirt,liquid or dust from entering the piping.Unit Installation period Protection methodOutdoor unit >1 month Pinch the pipe<1 month Pinch or tape the pipeIndoor unit Regardless of theperiodSeal the piping and wiring intake holes using sealing material (fieldsupply), otherwise the capacity of the unit will drop and smallanimals may enter the machine.If the gaps are not properly sealed, sound level will increase andsweat problems can occur.6.4.8 To braze the pipe endNOTICEPrecautions when connecting field piping. Add brazingmaterial as shown in the figure.1 1112 2≤Ø25.4 >Ø25.4▪ When brazing, blow through with nitrogen to prevent creation oflarge quantities of oxidised film on the inside of the piping. Thisfilm adversely affects valves and compressors in the refrigeratingsystem and prevents proper operation.▪ Set the nitrogen pressure to 20 kPa (0.2 bar) (just enough so itcan be felt on the skin) with a pressure-reducing valve.a b c d effa Refrigerant pipingb Part to be brazedc Tapingd Manual valvee Pressure-reducing valve