Mechanical Installation 2.214Wall MountingWall (surface) mounting is used where flush mounting is inapplicable (in concrete andsteel structures, entry barrier columns, etc.). The frame is not used.Caution Wall mounting may be a problem where vandals may destroy the unit (inpublic garages, e.g.). Therefore, use steel fixing elements instead of thedowels and screws included in the delivery. Be sure to insert plugs into unused bushing holes to avoid water leakageduring facade cleaning, for example. Never leave the holes open for even ashort time (one day delay between mounting and cable connection, e.g.).Safety Warning Eliminate the risk of accident! Wall mounting is not suitable for narrowpassages or places where people’s attention may be distracted. Themanufacturer shall not be liable for injuries incurred as a result of unsafemounting!1. Select the 2N® Helios Force / Safetyposition with respect to the supplycables. Where the cables are installedinside a structure or wall, use the holeat the intercom bottom.2. Drill holes of the depth of 70 mm fordowels in the wall as shown in thefigure. Push or hammer the encloseddowels into the drilled holes. Usesome suitable building adhesive if thedowels are too loose. Use fixingelements of your own for steelstructure surface mounting (metricscrews + nuts, e.g.).3. Remove the front panel from theintercom. The electronic parts of thetwo bottom buttons remain on thepanel in the four-name plate version.4. Select the holes for cable supply.Select and mount the bushingsdepending on the cables: 2-holebushing or 1-hole bushing or both.Insert the blanks in the other holes.5. Put the intercom on the wall/structurewhile introducing cables inside. Leave some of the cables inside the unit as areserve. Insert the plugs in the unused bushings and tighten the bushing nutscarefully.6. Do not complete mounting until you have finished electrical installation – refer toMounting Completion. Where cables lead along the surface, use the bushingsincluded in the delivery.