5
Figure 9. Weight Distribution Mat Construction
surface is unable to support the weight of the siren. This mat
distributes the Speaker Array weight to approximately 18
pounds per square foot (88kg per square meter). When
installing the siren on a flat roof, be sure that the Speaker
Array is mounted above any obstructions which may reduce
sound propagation.
To install the Speaker Array on a flat roof or other
flat surface, proceed as follows:
1. If desired, construct a platform for mounting
the Speaker Array. The platform must be capable of
supporting at least 350 pounds (162 kg.) and withstanding a
siren wind load of 110 mph (177kmph). Platform
construction details are left to the builder and the safety
engineer. Locate the platform at the siren installation site,
and anchor the platform to the mounting surface.
WARNING
The eyebolts and hoisting bracket do not have
sufficient strength to support the combined
weight of the Speaker Array and a platform.
Therefore, do NOT attempt to lift the Speaker
Array and platform together using the eyebolts
as lifting points.
Also, never attempt to lift the Speaker Array
by one eyebolt. The assembly is designed to
be lifted by utilizing both eyebolts.
2. Hoist the Speaker Array to the installation site
using both eyebolts as lifting points.
3. Anchor the Speaker Array to the mounting
surface with user-supplied 1/2" lag bolts or nuts and bolts, as
appropriate, through the four inner and four outer mounting
holes in the Speaker Array base plate.
NOTE
When using the weight distribution mat, use
the mounting holes shown in figure 9. When
mounting the siren directly on a roof, be sure
to install waterproof joints where the mounting
bolts pass through the roof so that water does
not enter the building.
4. Federal recommends that the 50-foot (15.2m.)
interconnecting cable be routed through user-supplied
conduit to the Control Unit. If this recommended installation
is to be performed, a user-supplied 1" conduit fitting must be
installed in the junction box as described in paragraph
III.B.2. of this Instruction Sheet.
5. Ensure that the wooden blocks, located near
the rollers at the bottom of the rotator assembly, have been
removed as described in paragraph III.A.2.
6. Install the Control Unit by performing the
procedure in the MCP Installation and Maintenance
Instructions.
NOTE
The 3-foot length of flexible conduit allows the
junction box to be positioned after the conduit
has been installed.
