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4 Installation Procedure4.9.1 Electrical ConnectionsIt is important that the Live (L) and Neutral (N) are not interchanged.A two pole shut off switch with a contact separation of at least 3 mm MUST be fitted in themains supply to the boiler with a maximum fuse value of 3ARoute the main cable through one of the cable glands at the rear of the controls pod to themains connection terminal (40) the brown wire being connected to terminal (L), the blue wire to(N) and the green / yellow to (E) ensuring that the earth (green / yellow) is longer that the liveand neutral wires. Ensure that the routing of the wire does not allow the cable to exceed itsmaximum safe working temperature.(A) Low voltage connections (to ancillaryequipment)(B) 230 V mains connection(C) Internal extension(D) Main circuit boardFigure 4/L:4.9.2 Fitting the user interfaceWhen the installation is complete and all connections have been secured, insert the userinterface behind the lower drop down door by inserting into the central aperture bottom firstthen pushing backwards to make the electrical contacts.4.10 External ControlsClock /ThermostatInstall the Vitotrol 100 UTA orVitotrol 100 UTD clock thermostatin accordance with the instructionscontained in the kit.33
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