Federal Signal 253-012-048 Instrucciones De Instalación Para página 5

Installation
This alarm is designed to concentrate its audible alarm in the
target hazard area. For proper warning signal coverage, the
alarm should be mounted approximately 4 ft above ground level
with the alarm sound ports facing the target hazard area. There
should be no obstructions around or blocking the sound ports
of the unit.
Do not mount the alarm with the sound ports facing upwards
where it can become buried, submerged or clogged with mud,
water and other debris. A clogged alarm will be rendered inef-
fective and will produce little or no sound output. Always be sure
that the alarm's sound ports are facing the area you are trying to
warn, the ports are not clogged and that the alarm is functioning
properly before using the vehicle.
The Model 253 must hear the surrounding noise level to properly
adjust its sound output. It must be mounted to the rear of the
vehicle approximately 4 ft above ground level with the grille fac-
ing rearward (unobstructed towards the listening field/targeted
hazard area).
1. Select a mounting location at the rear of the vehicle that will
provide protection from impact and adverse weather conditions
while allowing unobstructed sound projection to the target haz-
ard area.
A suggested location is on the rear of the vehicle, just inside the
last cross member or other sturdy part of the body structure. The
alarm's "L-type" mounting configuration provides mounting flex-
ibility and allows installation in a variety of locations.
Before drilling holes in any part of a vehicle, be sure that
both sides of the mounting surface are clear of parts that
could be damaged, such as brake lines, fuel lines, electrical
wiring or other vital parts.
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