5
4. Fixing Intercoms
4.1 External intercom
Important: To give the best possible waterproofi ng and appearance we
recommend taking the wiring through the exterior wall directly behind
the external intercom so that the cabling will feed directly through
a back box cable knock out. If the surface to be fi xed to is not even
(e.g. pebbledash or brickwork with raised pointing) we recommend
the use of at least 10mm (3/8") thick marine ply as a mounting plate
between the wall and the back box to prevent its distortion and loss of
waterproofi ng.
i Remove the back box from the external intercom in the following way. Insert
a small screwdriver blade in the end cap screwdriver notch (fi g 4, i) and lever
end cap so that it slides outwards from the main case (in opposite directions
to those shown in fi g 4, iv). Remove the two fi xing screws (as shown in fi g 4,
iii) and remove the back box from the rear of the external intercom.
ii This is a convenient time to mark the nameplate.
Referring to fi g 5, remove screw holding the PCB assembly to the transparent
housing. Lever one of the catches on the transparent housing clear of the
PCB assembly and lift the PCB assembly clear of the transparent housing.
Lever out the diffuser and nameplate from the transparent housing.
Mark the nameplate as required with a permanent fi bre-tipped pen. When
dry insert the nameplate into its recess in the housing ensuring it is the right
way up. Replace the diffuser on top of the nameplate and push the PCB
housing to engage with the catches of the transparent housing. Replace the
screw holding the transparent and PCB housings together.
iii Offer the back box up to the required position on the wall (refer to section
3.1). Decide which of the cable knock outs is to be used. Score around the
groove with a sharp knife and push the centre out. Feed the 4 core cable
through this knock out in the back box (see fi g 4, ii). Mark the positions of
the four fi xing screws (no 8 roundhead) using the back box as a template
(see fi g 4, ii). Remove the back box, drill and, if necessary plug holes.
Feed the cables through the wiring slot. Fix the back box to the wall with
No. 8 roundhead screws.
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