Daikin RZQG71L9V1B Installer's Reference Manual

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Daikin RZQG71L9V1B Installer's Reference Manual Manual pdf 18 page image

6 InstallationInstaller reference guide18RZQG71~140L_V1+Y1 + RZQSG100~140L_V1+Y1Split system air conditioners4P385522-1A – 2016.10NOTICEUse this vacuum pump for R410A exclusively. Using thesame pump for other refrigerants may damage the pumpand the unit.NOTICE▪ Connect the vacuum pump to both the service port ofthe gas stop valve and the service port of the liquidstop valve to increase efficiency.▪ Make sure that the gas stop valve and liquid stop valveare firmly closed before performing the leak test orvacuum drying.6.5.3 Checking refrigerant piping: Setupacfcfb d e hgiabABd eR410AR410AA Setup in case of pairB Setup in case of twina Pressure gaugeb Nitrogenc Refrigerantd Weighing machinee Vacuum pumpf Stop valveg Main pipingh Refrigerant branch kiti Branch piping6.5.4 To check for leaksNOTICEDo NOT exceed the unit's maximum working pressure (see"PS High" on the unit name plate).NOTICEMake sure to use a recommended bubble test solutionfrom your wholesaler. Do not use soap water, which maycause cracking of flare nuts (soap water may contain salt,which absorbs moisture that will freeze when the pipinggets cold), and/or lead to corrosion of flared joints (soapwater may contain ammonia which causes a corrosiveeffect between the brass flare nut and the copper flare).1 Charge the system with nitrogen gas up to a gauge pressure ofat least 200 kPa (2 bar). It is recommended to pressurize to3000 kPa (30 bar) in order to detect small leaks.2 Check for leaks by applying the bubble test solution to allconnections.3 Discharge all nitrogen gas.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.6.5.5 To perform vacuum drying1 Vacuum the system until the pressure on the manifold indicates−0.1 MPa (−1 bar).2 Leave as is for 4-5 minutes and check the pressure:If the pressure… Then…Does not change There is no moisture in thesystem. This procedure isfinished.Increases There is moisture in thesystem. Go to the next step.3 Evacuate for at least 2 hours to a pressure on the manifold of−0.1 MPa (−1 bar).4 After turning OFF the pump, check the pressure for at least1 hour.5 If you do NOT reach the target vacuum or cannot maintain thevacuum for 1 hour, do the following:▪ Check for leaks again.▪ Perform vacuum drying again.NOTICEMake sure to open the stop valves after installing therefrigerant piping and performing vacuum drying. Runningthe system with the stop valves closed may break thecompressor.6.6 Charging refrigerant6.6.1 About charging refrigerantThe outdoor unit is factory charged with refrigerant, but in somecases the following might be necessary:What WhenCharging additional refrigerant When the total liquid pipinglength is more than specified(see later).Completely recharging refrigerant Example:▪ When relocating the system.▪ After a leak.For RZQG only: When piping length is <5 m, a complete recharge ofthe unit is required.Charging additional refrigerantBefore charging additional refrigerant, make sure the outdoor unit'sexternal refrigerant piping is checked (leak test, vacuum drying).INFORMATIONDepending on the units and/or the installation conditions, itmight be necessary to connect electrical wiring before youcan charge refrigerant.Typical workflow – Charging additional refrigerant typically consistsof the following stages:1 Determining if and how much you have to charge additionally.2 If necessary, charging additional refrigerant.