Bosch LA3-VARI-B Installation Manual page 21

VARI-directional array
Configuration
VARI base unit only
VARI base + one extension
VARI base + two extensions
Warning!
Only use the brackets that are supplied with the loudspeakers for loudspeaker mounting. The
!
VARI loudspeakers are heavy and must be securely fixed to a flat vertical surface.
It is important to ensure that all mounting points are in the same vertical plane, to avoid the
unit being bent when the screws are tightened. The design of the hinged brackets makes it
possible to drill the wall and insert the fixing screws without removing the brackets from the
loudspeaker assembly. The elongated shape of the fixing holes allows the screw heads to pass
through the rear plate of the bracket and the speaker is then lowered so that the screw shaft
sits in the elongation.
Proceed as follows:
1.
2.
3.
4.
5.
6.
7.
8.
Bosch Security Systems B.V.
Use the supplied 30 mm hexagon-headed screws, together with the washers and wall
plugs to secure the brackets to the wall. The head size of the supplied screws allow the
brackets to slide over the heads later on (step 7).
Refer to the diagram below. Mark on the centreline the position for the lower hole of the
bottom bracket, which will be 89 mm above the datum height previously marked (refer to
section Mounting height, page 20). The upper hole of the bottom bracket will be 80 mm
above this. Mark the other pairs of holes higher up the centreline using the dimensions
given in the drawing. Note that the hole spacing for the two holes in each bracket is
always 80 mm.
Mark and drill the holes (8 mm) for the wall plugs.
Insert the plugs and screws into the holes. Tighten the screws with a spanner, but stop
with a few mm of screw shaft visible between the head and the wall.
Remove the front grille from the VARI base unit by gently lifting the grille at the locations
of the 'snap-on' fittings which hold it in place. Unscrew the six self-tapping screws
securing the connector compartment cover and remove the cover.
If flexible steel (or plastic, nylon, etc.) conduit is to be used to contain the cabling to the
rear of the loudspeaker, a conduit fitting or entry bush of the correct size for the conduit
should now be fitted to the 37 mm diameter hole in the rear of the connector
compartment.
Open the hinges on all the mounting brackets. Lift the VARI loudspeaker into position and
slide the brackets over the heads of the hex-head screws protruding from the wall, at the
same time threading all cabling through the rear cable hole (with or without its bush) and
the connector compartment so that it is free and accessible from the front.
Gently lower the VARI so that all fixing screws are fully engaged in the vertical elongations
of their bracket holes. Firmly tighten all the screws. Close the hinged brackets so that the
loudspeaker is in its correct orientation. Re‑check the verticality with a spirit level or
similar levelling device.
Brackets
2
3
4
Installation manual
Installation | en 21
2018.06 | V1.3 |