Federal Signal Corporation 121 Hoja De Instrucciones página 3

III. INSTALLATION.
A. Model 121.
1. Roof Mounting.
The Model 121 is designed for vehicular and portable use. It comes with a
magnetic mounting base and is equipped with a plug that fits in a standard cigarette lighter
socket. If the light is used outdoors, it MUST be mounted with the dome up.
Because vehicle roof construction and driving conditions vary, Federal does not
recommend driving a vehicle with a magnetically mounted warning light installed.
The light could fly off the vehicle causing injury or damage. Repair of damage
incurred because of ignoring this warning shall be the sole responsibility of the
user.
Holding power of magnetic mounting systems is dependent upon surface finish,
surface flatness, and thickness of the steel mounting surface. Therefore, to promote
proper magnetic mounting:
• Mounting surface and magnets must be kept clean, dry, and free of foreign
particles that prevent good surface contact.
• Ensure that mounting surface is flat.
• Magnet mounting system should not be used on vehicles with vinyl tops.
• To prevent sliding of light assembly on mounting surface, quick acceleration
and hard stops should be avoided.
• If the light is to be held directly to the roof by the magnet, ensure that the
power cable is not under the magnet.
2. Dashboard Mounting.
When installing equipment inside air bag equipped vehicles, the installer MUST
ensure that the equipment is installed ONLY in areas recommended by the vehicle
manufacturer.
Failure to observe this warning will reduce the effectiveness of the air bag, damage
the air bag, or potentially damage or dislodge the equipment, causing serious
injury or death to you or others.
a.
b.
c.
The vinyl cover is provided for use with the light when it is semi-
permanently mounted behind the windshield on the dash of the vehicle.
Use the dash mounting plate provided if the dash is made of non-ferrous
material. Tape or screw the plate to the dash.
If the dash is narrow or drops at a sharp angle, fabricate an angle
bracket and fasten it to the dashboard so that the light is level. Screw
the mounting plate to the bracket. If steel is used to fabricate the
mounting bracket, it is not necessary to secure the mounting plate to the
bracket. Mount the light directly on the bracket.
-2-