Nimbus Pocket M NET R32 Installation Manual UK

Electrical connections

Electrical connections 5.4 Installing the system interface Note: when installing cascade systems, to install the system interface refer to the relevant dedicated manual. Positioning The system interface detects the room temperature. This factor must be taken into account when choosing its position. We recommend positioning the appliance far from heat sources (radiators, direct exposure to sunlight, fireplaces, etc.). We also advise against positioning it near draughts or external openings that could affect the operation of the system interface. The interface must be placed at least 1.5 m above the floor. a Installation should be performed by a qualified technician. Before installing the appliance, ensure that the electrical power supply is disconnected. 5.4.1 Wall installation The SENSYS HD system interface must be fitted to the wall prior to connecting the BUS line. – Open the holes required for fixing. – Fix the base of the device to the box on the wall using the screws (1). – Position the system interface on the base, pushing it slightly downwards. Fig. 50 Signal sending, receiving, and decoding is carried out using BUS protocol, which ensures the interaction between the system and the interface. Connect the cables to the terminal board located in the system’s indoor unit panel. NOTE: Use a shielded cable or a twisted-pair cable to connect the system interface and the indoor unit so as to avoid interference problems. 1 Fig. 48 – Connect the pair of wires to connector (2) while respecting the B-T polarity. B T BUS B T 2 B T Blue Orange Fig. 49 32 / EN

Commissioning 6. Commissioning 6.1 Checking for electrical dispersions and gas leakages 6.1.1 Electrical safety checks Upon completing the installation, check that all the power cables have been installed in conformity to the relevant national and local regulations and according to the instructions contained in the installation manual. PRIOR TO THE OPERATIONAL TEST Check the integrity of the earthing circuit. Measure the earth resistance with a visual inspection and with a specific tester. The earth resistance must be below 0.1 Ω. For TT system the earth resistance must be below 15 Ω. Please ensure that differential switch is compliant with that ohmic value of earth impedance. DURING THE OPERATIONAL TEST Check for electrical dispersions. During the functional test, carry out a complete electrical check, e.g. with the help of a multimeter, in order to identify any electrical dispersions. If an electrical dispersion is detected, switch off the unit immediately and contact a qualified electrician to identify and solve the cause of the problem. a All electrical connections must be made by an authorised electrician in conformity to the national and local electrical standards. 6.2 Preliminary checks OUTDOOR UNIT – The unit must be positioned on a sturdy and perfectly horizontal base, in a place that is easily accessible for subsequent maintenance operations. – If there are significant air draughts, a protective screen must be fitted and positioned at an appropriate distance. – There must not be any obstacle hindering the flow of air. – The supporting structure must be able to withstand the weight of the outdoor unit. – If the installation site is subject to frequent snowfalls, the outdoor unit must be positioned at least 200 mm above the usual snowfall level. INDOOR UNIT – The unit must be positioned in an enclosed space and in a place easily accessible for subsequent maintenance operations. – The unit must be anchored firmly. 6.1.2 Check for gas leakages If a leak detector is used, follow the instructions contained in the user manual of the device. 33 / EN