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Nuos Plus Wi-Fi - Manual UK

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ELECTRICAL CONNECTIONS

ELECTRICAL CONNECTIONS WARNING! Before you get access to terminals, all supply circuits must be disconnected. IMPORTANT Where an appliance is installed in a room containing a bath or shower, the appliance and any electrical switch or any appliance control, utilitising mains electricity should be situated specifically in accordance with current IEE wiring regulations, Health & Safety document no. 635 (Electricity at Work Regulations). For unusual locations special procedures may be necessary. BS 6798 gives detailed guidance on this aspect. The appliance is supplied with a power supply cable (should the latter need to be replaced, use only original spare parts supplied by the manufacturer). It is advisable to carry out a check on the electrical system to verify conformity to the regulations in force. Verify that the electrical system can suitably withstand the water heater’s maximum power consumption values (refer to the data plate), in terms of the size of the cables and their conformity to the regulations in force. It is forbidden to use multiple outlet sockets, extension cables or adaptors. It is forbidden to use piping from the water, heating and gas systems for earthing the appliance. Prior to operating the machine, make sure that the electricity mains voltage conforms to the value indicated on the appliance’s data plate. The manufacturer of the appliance shall not be held liable for any damage caused by failure to earth the system or due to anomalies in the electric power supply. To disconnect the appliance from the mains, use a bipolar switch complying with all applicable CEI- EN regulations in force (minimum distance between contacts 3 mm, switch preferably equipped with fuses). The appliance must comply with the European and national standards, and must be protected by a 30mA RCD. The main circuit board on the appliance is fitted with an earth contact for operating purposes only, not for safety purposes. ELECTRICAL CONNECTION Nuos Flex or 3183TQ Flex 3-Core x 2.5mm2 heat resistant BS6500 13 amp Class A Double Pole Isolating Swicth with at least 3 mm pole separation and electric and mechanical indicators. Fused 13 amp. Zone 2 Zone 3 CABLE FUSE Permanent power supply (cable supplied with the appliance) 3G ø min. 1.5 mm² H05VV-F B 16A Signal HC-HP (cable not supplied with the appliance) 2G ø min. 1 mm² H05VV-F Signal AUX/PV/SG (cable not supplied with the appliance) 2G ø min. 1 mm² H05VV-F Signal BUS* (cable not supplied with the appliance) max. 50 m - 2G ø min. 1 mm² * IMPORTANT: in the bus connection, to avoid interference problems, use a shielded cable or twisted pair cable. 16 /EN

The main circuit board on the appliance is fitted with an earth contact for operating purposes only, not for safety purposes. Open the cover to access the connection board located on the right, rear side of the product and carry out the connections according to the chosen configuration: PERMANENT ELECTRICAL CONNECTION (24h/24h) Use this configuration whenever users do not have a two-tier electricity rate. The water heater will always be connected to the power supply network to ensure 24h operation. AUX AUXILIARY CONNECTION If you have a PV system to be connected or an SG signal available, you can connect a bipolar cable from the inverter or the SG signal cable (alternatively, not both) to the connection box (secure the cable into the dedicated cabling sheath). Connect this cable (C) to the connector called “SG2” and activate the PV (P11) or SG (P13) function via the installer menu. WARNING: signal 230 V. Only for SYS or TWIN SYS models, if you have an auxiliary heat generator (e.g. boiler) and you would like to use it instead of the integration carried out by the heating element, you can connect a bipolar cable (D) from the heat generator (if provided) to the product connection box (secure the cable into the dedicated cabling sheath). Connect the cable to the connector called “AUX” and set the P14 parameter to 1 via the installer menu. SG2 SG1 N 16 A AUX D N L A SG2 SG1 C N 16 A ELECTRICAL CONNECTION WITH DUAL POWER SUPPLY AND HC-HP SIGNAL (power supply 24h/24h) It offers the same cost advantages as the two-tier rate configuration but, additionally, it provides rapid heating thanks to the BOOST mode that activates the heating even with the HP rate. 1) Connect a bipolar cable to the appropriate signal contacts on the meter. 2) Connect the signal bipolar cable (B) to the appropriate EDF connector “SG1” which is inside the connection box (make a hole in the rubber plugs to create a suitable passage section). WARNING: The EDF signal has a 230V voltage. 3) Activate the HC-HP function through the P1 parameter in the installer menu. N L If you connect the SYS version to the boiler/stove, it is advisable to use upper sensor slot S3. If you connect the TWIN SYS version to the boiler/stove, it is advisable to use sensor slot S4 for the lower heat exchanger and S3 for the upper one). If you connect the SYS or TWIN SYS versions to the solar control unit (lower heat exchanger), you can use the lower sensor slot on its own (S2) or both sensor slots (S2) and (S3/S4). A EDF AUX SG2 N 2 A N 16 A SG1 B N L 17 / EN