Daikin VRV IV+ RXYTQ8U5/U7YF Installation And Operation Manual

17 CommissioningInstallation and operation manual32RXYTQVRV IV+ heat pump for high ambient temperatures4P546223-1C – 2021.11Fuses, circuit breakers, or protection devicesCheck that the fuses, circuit breakers, or the locallyinstalled protection devices are of the size and typespecified in the chapter "15.1 Safety devicerequirements" [4 26]. Be sure that neither a fuse nor aprotection device has been bypassed.Internal wiringVisually check the electrical component box and theinside of the unit for loose connections or damagedelectrical components.Pipe size and pipe insulationBe sure that correct pipe sizes are installed and that theinsulation work is properly executed.Stop valvesBe sure that the stop valves are open on both liquid andgas side.Damaged equipmentCheck the inside of the unit for damaged components orsqueezed pipes.Refrigerant leakCheck the inside of the unit on refrigerant leakage. If thereis a refrigerant leak, try to repair the leak. If the repair isunsuccessful, call your local dealer. Do not touch anyrefrigerant which has leaked out from refrigerant pipingconnections. This may result in frostbite.Oil leakCheck the compressor for oil leakage. If there is an oilleak, try to repair the leak. If the repairing is unsuccessful,call your local dealer.Air inlet/outletCheck that the air inlet and outlet of the unit is NOTobstructed by paper sheets, cardboard, or any othermaterial.Additional refrigerant chargeThe amount of refrigerant to be added to the unit shall bewritten on the included "Added refrigerant" plate andattached to the rear side of the front cover.Installation date and field settingBe sure to keep record of the installation date on thesticker on the rear of the upper front panel according toEN60335‑2‑40 and keep record of the contents of the fieldsetting(s).17.3 About the test runNOTICEMake sure to carry out the test run after the firstinstallation. Otherwise, the malfunction code will bedisplayed on the user interface and normal operation orindividual indoor unit test run cannot be carried out.The procedure below describes the test operation of the completesystem. This operation checks and judges following items:▪ Check for incorrect wiring (communication check with indoorunits).▪ Check of the stop valves opening.▪ Judgement of piping length.▪ Abnormalities on indoor units cannot be checked for each unitseparately. After the test operation is finished, check the indoorunits one by one by performing a normal operation using the userinterface. Refer to the indoor unit installation manual for moredetails concerning the individual test run.INFORMATION▪ It may take 10 minutes to achieve a uniform refrigerantstate before the compressor starts.▪ During the test operation, the refrigerant running soundor the magnetic sound of a solenoid valve may becomeloud and the display indication may change. These arenot malfunctions.17.4 To perform a test run1 Close all front panels in order to not let it be the cause ofmisjudgement (except the electrical component box inspectionopening service cover).2 Make sure all field settings you want are set; see "16.1 Makingfield settings" [428].3 Turn ON the power to the outdoor unit and the connectedindoor 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.4 Make sure the default (idle) situation is existing; see "16.1.4 Toaccess mode 1 or 2" [4 29]. Push BS2 for 5 seconds or more.The unit will start test operation.Result: The test operation is automatically carried out, theoutdoor unit display will indicate " " and the indication "Testoperation" and "Under centralised control" will display on theuser interface of indoor units.Steps during the automatic system test run procedure:Step DescriptionControl before start up (pressure equalisation)Cooling start up controlCooling stable conditionCommunication checkStop valve checkPipe length checkRefrigerant amount checkPump down operationUnit stopNote: During the test operation, it is not possible to stop the unitoperation from a user interface. To abort the operation, press BS3.The unit will stop after ±30 seconds.5 Check the test operation results on the outdoor unit 7‑segmentdisplay.Completion DescriptionNormal completion No indication on the 7‑segment display (idle).AbnormalcompletionIndication of malfunction code on the7‑segment display.Refer to "17.5 Correcting after abnormalcompletion of the test run" [433] to takeactions for correcting the abnormality. Whenthe test operation is fully completed, normaloperation will be possible after 5 minutes.