Daikin RWEYQ8T9Y1B Installer And User Manual

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6 InstallationInstaller and user reference guide28RWEYQ8~14T9V1B + RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1 – 2017.042 Check that, with the vacuum pump turned off, the targetvacuum is maintained for at least 1 hour.3 Should you fail to reach the target vacuum within 2 hours ormaintain the vacuum for 1 hour, the system may contain toomuch moisture. In that case, break the vacuum by pressurisingwith nitrogen gas to a gauge pressure of 0.05 MPa (0.5 bar)and repeat steps 1 to 3 until all moisture has been removed.4 Depending on whether you want to immediately chargerefrigerant through the refrigerant charge port or first pre-chargea portion of refrigerant through the liquid line, either open theoutdoor unit stop valves, or keep them closed. See "6.7.2 Aboutcharging refrigerant" on page 28 for more information.INFORMATIONAfter opening the stop valve, it is possible that the pressurein the refrigerant piping does NOT increase. This might becaused by e.g. the closed state of the expansion valve inthe outdoor unit circuit, but does NOT present any problemfor correct operation of the unit.6.6 To insulate the refrigerant pipingAfter finishing the leak test and vacuum drying, the piping must beinsulated. Take into account the following points:▪ Make sure to insulate the connection piping and refrigerant branchkits entirely.▪ Be sure to insulate the liquid and gas piping (for all units).▪ Use heat resistant polyethylene foam which can withstand atemperature of 70°C for liquid piping and polyethylene foam whichcan withstand a temperature of 120°C for gas piping.▪ Reinforce the insulation on the refrigerant piping according to theinstallation environment.AmbienttemperatureHumidity Minimum thickness≤30°C 75% to 80% RH 15 mm>30°C ≥80% RH 20 mmCondensation might form on the surface of the insulation.▪ If there is a possibility that condensation on the stop valve mightdrip down into the indoor unit through gaps in the insulation andpiping because the outdoor unit is located higher than the indoorunit, this must be prevented by sealing up the connections. Seebelow figure.3×aba Insulation materialb Caulking etc.6.7 Charging refrigerant6.7.1 Precautions when charging refrigerantWARNING▪ Only use R410A as refrigerant. Other substances maycause explosions and accidents.▪ R410A contains fluorinated greenhouse gases. Itsglobal warming potential (GWP) value is 2087.5. DoNOT vent these gases into the atmosphere.▪ When charging refrigerant, always use protectivegloves and safety glasses.NOTICEIf the power of some units is turned off, the chargingprocedure cannot be finished properly.NOTICEIn case of a multiple outdoor system, turn on the power ofall outdoor units.NOTICEBe sure to turn on the power 6 hours before operation inorder to have power running to the crankcase heater andto protect the compressor.NOTICEIf operation is performed within 12 minutes after the indoorand outdoor units are turned on, the compressor will notoperate before the communication is established in acorrect way between outdoor unit(s) and indoor units.NOTICEBefore starting charging procedures, check if the7‑segment display indication of the outdoor unit A1P PCBis as normal (see "7.2.4 To access mode 1 or 2" onpage 36). If a malfunction code is present, see"10.2 Solving problems based on error codes" onpage 43.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.6.7.2 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.6.7.3 To determine the additional refrigerantamountINFORMATIONFor final charge adjustment in the test laboratory, pleasecontact your local dealer.