21English9 - elecTrIcal connecTIonS (fig. 15/16)All field electrical connections are the responsibility ofthe installer.WARNING: Make water connections before electricalconnections.Make ground connection prior to any otherelectrical connections.CAUTION:• Connect the power cable correctly. If the power cableis connected in a wrong way, electric parts may bedamaged.• Connection to the mains supply is of the Y type;therefore, the cable must only be replaced by thetechnical support in order to prevent any risk.• Use the specified cables for wiring and connect themfirmly to the terminals.WARNING:• Be sure to provide grounding; inappropriategrounding may cause electric shock.• Do not connect ground wires to gas pipes, waterpipes, lightning rods or ground wires for telephonecables.DANGER: Do not modify this unit by removing any ofthe safety guards or by by-passing any of the safetyinterlock switches.FINAL CHECKWARNING:• If refrigerant gas leaks out during the installationwork, ventilate the room immediately.• If refrigerant gas leaks into the room and flows neara fire source, such as a cooking range, poisonous gasis generated.Contact the qualified service if one of the following eventstakes place:• hot or damaged power supply cable;• unusual noise during operation;• frequent operation of the protection devices;• unusual smell (such as smell of burning).DANGER: Electrical shock can cause severe personalinjury or death. These operations are carried out byqualified personnel only.WARNING:• This unit complies with Machinery (2006/42/EC),electromagnetic compatibility (2004/108/EC) andpressure equipment (EEC/97/23) Directives.• To avoid electric shock or fire make sure theseoperations are carried out by qualified personnelonly.• Ensure that national safety code requirements havebeen followed for the main supply circuit.• Follow all current national safety code requirements.• Ensure that a properly sized and connected groundwire is in place.• Check that voltage and frequency of the mains powersupply are those required; the available power mustbe adequate to operate any other possible appliancesconnected to the same line.• Check that the impedance of the mains power supplyis in conformance with the unit power inputindicated in the rating plate of the unit.• Make sure that properly sized disconnecting andsafety switches are installed.• For installation of wired remote controller pleaserefer to the control installation manual.• All devices for disconnection from the power supplymains must have a contact opening (4 mm) to allowtotal disconnection according to the conditionsprovided for the overvoltage class III.• The imbalance between voltage phases must alwaysbe less than 2%.unit 30rB008 012 015Power supply V- ph - Hz 400 - 3N - 50Allowable Voltage Range V 400 V ± 6%24 V via internal transformerControl circuit supply VMaximum start-up current (Un) * A 30 66 73Unit power factor at nominalcapacity**0.88 0.84 0.85Maximum operating power input ** kW 3.1 4.4 5.5Nominal unit operating currentdraw ***A 4.5 6.3 9.1Power Fuses (type gL) current A 10 16 20Power supply cables mm 2 H07RN-F 5 x 2.5mm2Maximum Pump Current ExternalcirculationA 2Fan motor capacitor (5 μF / 450V) N° 1 2 2Remote controller power supplycablesmm 2 H03VV-F 7 x 0.5 mm2* Maximum instantaneous start-up current (locked rotor current of thecompressor).** Power input, compressors and fans, at the unit operating limits (leaving watertemperature 18°C, outside air temperature 41°C) and nominal voltage of 400 V(data given on the unit nameplate).*** Standardised Eurovent conditions: water heat exchanger entering/leavingwater temperature 12°C/7°C, outside air temperature 35°C. and nominalvoltage of 400 V .9.1 - electrical connections (fig. 16)Remove the front panel, the electric parts appear at thefront side.The power supply cables can be inserted into thepipeholes. Be sure to fix the power cable with bundlingband sold on the market so that they do not make contactwith the compressor and the hot pipes.To ensure good tensile strength, the electric cables mustbefastened using the cable-holder on the plate(See fig. 16 A).If the unit operates at a voltage outside the limits or with aphase imbalance above 2%, this constitutes improper useand may afect the warranty. If the phase imbalance is hig.her than 2%, contact the local electricity boardimmediately.