Daikin RWEYQ8T9Y1B Installer And User Manual

Also see for RWEYQ10T9Y1B: Installation and operation manual Installer and user reference guide Installation and operation manual

9 Maintenance and serviceInstaller and user reference guide42RWEYQ8~14T9V1B + RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1 – 2017.04Step DescriptionPipe 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 "8.6 Correcting after abnormalcompletion of the test run" on page 42 to takeactions for correcting the abnormality. Whenthe test operation is fully completed, normaloperation will be possible after 5 minutes.8.6 Correcting after abnormalcompletion of the test runThe test operation is only completed if there is no malfunction codedisplayed on the user interface or outdoor unit 7‑segment display. Incase of a displayed malfunction code, perform correcting actions asexplained in the malfunction code table. Carry out the test operationagain and confirm that the abnormality is properly corrected.INFORMATIONRefer to the installation manual of the indoor unit fordetailed malfunction codes related to indoor units.8.7 Operating the unitOnce the unit is installed and test operation of outdoor unit andindoor units is finished, the operation of the system can start.For operating the indoor unit, the user interface of the indoor unitshould be switched ON. Refer to the indoor unit operation manual formore details.9 Maintenance and serviceNOTICEMaintenance must be done by an authorised installer orservice agent.We recommend to do maintenance at least once a year.However, applicable legislation might require shortermaintenance intervals.NOTICEIn Europe, the greenhouse gas emissions of the totalrefrigerant charge in the system (expressed as tonnesCO2-equivalent) is used to determine the maintenanceintervals. Follow the applicable legislation.Formula to calculate the greenhouse gas emissions:GWP value of the refrigerant × Total refrigerant charge [inkg] / 10009.1 Overview: Maintenance andserviceThis chapter contains information about:▪ Preventing electrical hazards when maintaining and servicing thesystem▪ Cleaning the plate heat exchanger▪ The refrigerant recovery operation9.2 Maintenance safety precautionsDANGER: RISK OF ELECTROCUTIONDANGER: RISK OF BURNINGNOTICE: Risk of electrostatic dischargeBefore performing any maintenance or service work, toucha metal part of the unit in order to eliminate static electricityand to protect the PCB.9.2.1 To prevent electrical hazardsWhen performing service to inverter equipment:1 Do not open the electrical component box cover for 10 minutesafter the power supply is turned off.2 Measure the voltage between terminals on the terminal blockfor power supply with a tester and confirm that the power supplyis shut off. In addition, measure points as shown in the figurebelow, with a tester and confirm that the voltage of the capacitorin the main circuit is less than 50 V DC.3 To prevent damaging the PCB, touch a non-coated metal partto eliminate static electricity before pulling out or plugging inconnectors.9.3 Maintenance of the plate heatexchangerThe performance of a plate heat exchanger may decline due to scaleaccumulation. It may be damaged by freezing due to the decrease inthe flow rate. For this reason, it is necessary to carry outprogrammed maintenance at regular intervals in order to preventscale.At the beginning of the season, carry out following inspections:▪ water quality test and follow the recommendations as described in"5.4.1 Water quality requirements" on page 19▪ clean the water filter,▪ water flow rate is correct,▪ operational conditions (e.g. pressure, water flow rate, outlettemperature,…) are normal.9.3.1 To clean the plate heat exchangerDisassembling and cleaning of the plate heat exchanger is notpossible. Please use following steps.Prerequisite: Provide a connection port on the water inlet and onthe water outlet and connect a circulation pump in between these 2connection ports when cleaning with chemicals.Prerequisite: Provide a stop valve in front of the inlet water pipeconnection port and a stop valve after the outlet water connectionport.Prerequisite: Use a solution with 5% diluted formic, citric, oxalic,acetic or phosphoric acid for cleaning scale. NEVER usehydrochloric, sulphuric or nitric acid because such solutions have astrong corrosive feature.