Daikin VRV IV W+ Series Installer And User Reference Manual

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

2 | General safety precautionsInstaller and user reference guide10RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1B – 2020.10WARNINGDuring tests, NEVER pressurize the product with a pressure higher than themaximum allowable pressure (as indicated on the nameplate of the unit).WARNINGTake sufficient precautions in case of refrigerant leakage. If refrigerant gas leaks,ventilate the area immediately. Possible risks:▪ Excessive refrigerant concentrations in a closed room can lead to oxygendeficiency.▪ Toxic gas might be produced if refrigerant gas comes into contact with fire.DANGER: RISK OF EXPLOSIONPump down – Refrigerant leakage. If you want to pump down the system, and thereis a leak in the refrigerant circuit:▪ Do NOT use the unit's automatic pump down function, with which you can collectall refrigerant from the system into the outdoor unit. Possible consequence: Self-combustion and explosion of the compressor because of air going into theoperating compressor.▪ Use a separate recovery system so that the unit's compressor does NOT have tooperate.WARNINGALWAYS recover the refrigerant. Do NOT release them directly into the environment.Use a vacuum pump to evacuate the installation.NOTICEAfter all the piping has been connected, make sure there is no gas leak. Use nitrogento perform a gas leak detection.NOTICE▪ To avoid compressor breakdown, do NOT charge more than the specified amountof refrigerant.▪ When the refrigerant system is to be opened, refrigerant MUST be treatedaccording to the applicable legislation.WARNINGMake sure there is no oxygen in the system. Refrigerant may only be charged afterperforming the leak test and the vacuum drying.Possible consequence: Self-combustion and explosion of the compressor because ofoxygen going into the operating compressor.▪ In case recharge is required, see the nameplate of the unit. It states the type ofrefrigerant and necessary amount.▪ The unit is factory charged with refrigerant and depending on pipe sizes and pipelengths some systems require additional charging of refrigerant.▪ Only use tools exclusively for the refrigerant type used in the system, this toensure pressure resistance and prevent foreign materials from entering into thesystem.▪ Charge the liquid refrigerant as follows: