Daikin VRV IV W+ Series Installer And User Reference Manual

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

19 | Electrical installationInstaller and user reference guide113RWEYQ8~14T9Y1BVRV IV water-cooled system air conditioner4P452191-1B – 2020.10L1 L2 L2 N19.7 To connect the optional wiringFor the optional wiring use insulated wires of a rated voltage of 250 V or higherand a minimal cross section of 1.25 mm² for single core wires and 0.75 mm² formulticore wires.Variable water flowThe variable water flow output signal is a low voltage control signal whichgenerates an output of 2~10 V DC depending on the required water flow ratethrough the plate heat exchanger. For more information, see "18.2.4 About thewater flow rate" [481].NOTICEThe maximum output power of the 2~10 V DC output signal is 50 mW. Exceeding thispower can result in damage of the system.Always use shielded cables with a minimal cross section of 0.75 mm² and a lengthlimited to 100 m.The control line of the valve/pump should be connected to the X2M connector inthe electrical switchbox. To connect the valve/pump to the outdoor unit, alsoprovide a separate 12 V DC power supply (with an output power of at least 50 mW)to the X2M connector.Connect the valve/pump to: X2M terminals 2 and 3.Connect the power source to X2M terminals 1 and 3 (respect the polarity).BLKINTERLOCK TW1IN TW2OUTWHTBLUBLUBLUYLWORGREDBRN+ –1 2 3 4 5 6 7 8 9 10X2M+– 2~10 V DC12 V DCabX2Ma Valve/pumpb Power supplyNOTICEMake sure to connect a flow switch to your water-cooled VRV IV system. Running thesystem with a flow rate below the minimum requirement can result in damage of thesystem.InterlockIt is mandatory to connect a flow switch to the interlock circuit of the outdoor unit.Running the system with a flow rate below the minimum requirement can result indamage of the system. The flow switch should be installed in the main water circuitbetween the plate heat exchanger and the closed valve. Select a flow switchcontact of at least 15 V DC, 1 mA.Connect the flow switch to: X2M terminals 5 and 6.