Daikin Altherma EHVZ04S18CB Installer's Reference Manual

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Daikin Altherma EHVZ04S18CB Installer's Reference Manual Manual pdf 30 page image

7 InstallationInstaller reference guide30ERLQ004~008CA + EHVZ04+08S18CBDaikin Altherma – Low temperature split4P401676-1D – 2018.07Typical workflowChecking the refrigerant piping typically consists of the followingstages:1 Checking for leaks in the refrigerant piping.2 Performing vacuum drying to remove all moisture, air ornitrogen from 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.7.6.2 Precautions when checking therefrigerant pipingINFORMATIONAlso read the precautions and requirements in thefollowing chapters:▪ General safety precautions▪ PreparationNOTICEUse a 2-stage vacuum pump with a non-return valve thatcan evacuate to a gauge pressure of −100.7 kPa(−1.007 bar)(5 Torr absolute). Make sure the pump oildoes not flow oppositely into the system while the pump isnot working.NOTICEUse this vacuum pump for R410A exclusively. Using thesame pump for other refrigerants may damage the pumpand the unit.NOTICE▪ Connect the vacuum pump to the service port of thegas stop valve.▪ Make sure that the gas stop valve and liquid stop valveare firmly closed before performing the leak test orvacuum drying.7.6.3 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.7.6.4 To perform vacuum dryingConnect the vacuum pump and manifold as follows:a djbfecg h iha Pressure meterb Gauge manifoldc Low-pressure valve (Lo)d High-pressure valve (Hi)e Charging hosesf Vacuum pumpg Service porth Valve lidsi Gas stop valvej Liquid stop valve1 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 Vacuum the system for at least 2 hours to a manifold pressureof −0.1 MPa (−1 bar).4 After turning the pump OFF, check the pressure for at least1 hour.5 If you do NOT reach the target vacuum or CANNOT maintainthe vacuum for 1 hour, do the following:▪ Check for leaks again.▪ Perform vacuum drying again.NOTICEBe sure to open the gas stop valve after piping installationand vacuuming. Running the system with the valve closed,the compressor may break down.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.7.7 Charging refrigerant7.7.1 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.