Daikin RWEYQ8T9Y1B Installation And Operation Manual

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5 InstallationInstallation and operation manual16RWEYQ8~14T9V1B+RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452190-1A – 2017.045.4 Checking the refrigerant piping5.4.1 About checking the refrigerant pipingRefrigerant piping works arefinished?The indoor units and/oroutdoor unit were alreadypowered ON?Use procedure:"Method 2: After power ON".Finish piping work.Use procedure:"Method 1: Before power ON(regular method)".YesNoNoYesIt is very important that all refrigerant piping work is done before theunits (outdoor or indoor) are powered on.When the units are powered on, the expansion valves will initialise.This means that they will close. Leak test and vacuum drying of fieldpiping and indoor units is impossible when this happens.Therefore, there will be explained 2 methods for initial installation,leak test and vacuum drying.Method 1: Before power ONIf the system has not yet been powered on, no special action isrequired to perform the leak test and the vacuum drying.Method 2: After power ONIf the system has already been powered on, activate setting [2‑21](refer to "6.1.4 To access mode 1 or 2" on page 24). This settingwill open field expansion valves to guarantee a R410A pipingpathway and make it possible to perform the leak test and thevacuum drying.NOTICEMake sure that all indoor units connected to the outdoorunit are powered on.NOTICEWait until the outdoor unit has finished the initialisation toapply setting [2‑21].Leak test and vacuum dryingChecking the refrigerant piping involves:▪ Checking for any leakages in the refrigerant piping.▪ Performing vacuum drying to remove all moisture, air or nitrogenin the refrigerant piping.If there is a possibility of moisture being present in the refrigerantpiping (for example, water may have entered the piping), first carryout the vacuum drying procedure below until all moisture has beenremoved.All piping inside the unit has been factory tested for leaks.Only field installed refrigerant piping needs to be checked.Therefore, make sure that all the outdoor unit stop valves are firmlyclosed before performing leak test or vacuum drying.NOTICEMake sure that all (field supplied) field piping valves areOPEN (not outdoor unit stop valves!) before you start leaktest and vacuuming.For more information on the state of the valves, refer to"5.4.3 Checking refrigerant piping: Setup" on page 16.5.4.2 Checking refrigerant piping: GeneralguidelinesConnect the vacuum pump through a manifold to the service port ofall stop valves to increase efficiency (refer to "5.4.3 Checkingrefrigerant piping: Setup" on page 16).NOTICEUse a 2-stage vacuum pump with a non-return valve or asolenoid valve that can evacuate to a gauge pressure of–100.7 kPa (–1.007 bar) (5 Torr absolute).NOTICEMake sure the pump oil does not flow oppositely into thesystem while the pump is not working.NOTICEDo not purge the air with refrigerants. Use a vacuum pumpto evacuate the installation.5.4.3 Checking refrigerant piping: Setupp< 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 mode.NOTICEDo not connect the vacuum pump to the suction gas stopvalve if the unit is intended to run in heat pump mode. Thiswill increase the risk of unit failure.Valve State of valveValve A OpenValve B OpenValve C OpenValve D OpenLiquid line stop valve CloseGas line stop valve CloseHigh pressure/low pressure gasline stop valveClose