Daikin RWEYQ8T9Y1B Installer And User Manual

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

10 TroubleshootingInstaller and user reference guide43RWEYQ8~14T9V1B + RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1 – 2017.041 Connect the piping for circulation of cleaning chemicals to theinlet piping of the plate heat exchanger.2 Fill a cleaning solution of 50°C~60°C for a while in the plateheat exchanger.3 Circulate for 2~5 hours by using a pump. Time for cleaningdepends on the temperature of the cleaning solution or thedegree of scale accumulation. Therefore, please watch thechange of dirtiness of the cleaning solution to determine thelevel of removal of scale.4 After circulating the cleaning solution, discharge the solutionfrom the plate heat exchanger.5 Fill the plate heat exchanger with a solution of 1-2% sodiumhydroxide (NaOH) or sodium bicarbonate (NaHCO3).6 Circulate this solution for 15-20 minutes for neutralizationpurpose.7 Rinse the inside of the plate heat exchanger with care usingfresh and clean water.8 When using any commercially available cleaning agent, checkin advance that such agent has no corrosive features againststainless steel and copper. Ask the manufacturer of thecleaning agent for more details.9 Check if the unit can operate in a normal way.9.4 About service mode operationRefrigerant recovery operation/vacuuming operation is possible byapplying setting [2‑21]. Refer to "7.2 Making field settings" onpage 35 for details how to set mode 2.When vacuuming/recovery mode is used, check very carefully whatshould be vacuumed/recovered before starting. See installationmanual of the indoor unit for more information about vacuuming andrecovery.9.4.1 To use vacuum mode1 When the unit is at standstill, set the unit in [2‑21]=1.Result: When confirmed, the indoor and outdoor unit expansionvalves will fully open. At that moment the 7‑segment displayindication= and the user interface of all indoor unitsindicate TEST (test operation) and (external control) andthe operation will be prohibited.2 Evacuate the system with a vacuum pump.3 Press BS3 to stop vacuuming mode.9.4.2 To recover refrigerantThis should be done by a refrigerant reclaimer. Follow the sameprocedure as for vacuuming method.DANGER: RISK OF EXPLOSIONPump down – Refrigerant leakage. If you want to pumpdown the system, and there is a leakage in the refrigerantcircuit:▪ Do NOT use the unit's automatic pump down function,with which you can collect all refrigerant from thesystem into the outdoor unit. Possible consequence:Self-combustion and explosion of the compressorbecause of air going into the operating compressor.▪ Use a separate recovery system so that the unit'scompressor does NOT have to operate.NOTICEMake sure to NOT recover any oil while recoveringrefrigerant. Example: By using an oil separator.10 Troubleshooting10.1 Overview: TroubleshootingThis chapter describes what you have to do in case of problems.It contains information about:▪ Solving problems based on error codes10.2 Solving problems based on errorcodesIn case of a displayed malfunction code, perform correcting actionsas explained in the malfunction code table.After correcting the abnormality, press BS3 to reset the malfunctioncode and retry operation.The malfunction code which is displayed on the outdoor unit willindicate a main malfunction code and a sub code. The sub codeindicates more detailed information about the malfunction code. Themalfunction code will be displayed intermittent.Example:Code ExampleMain codeSub codeWith an interval of 1 second, the display will switch between maincode and sub code.11 DisposalNOTICEDo not try to dismantle the system yourself: the dismantlingof the system, treatment of the refrigerant, oil and otherparts must comply with applicable legislation. Units mustbe treated at a specialised treatment facility for reuse,recycling and recovery.12 Technical data▪ A subset of the latest technical data is available on the regionalDaikin website (publicly accessible).▪ The full set of latest technical data is available on the Daikinextranet (authentication required).12.1 Overview: Technical dataThis chapter contains information about:▪ Service space▪ Piping diagram▪ Wiring diagram12.2 Service space: Outdoor unitMake sure the space around the unit is adequate for servicing andthe minimum space for ventilation is available (refer to the figurebelow).