Federal Signal Corporation 121 Hoja De Instrucciones página 4

B. Models 121A and 121S.
Models 121A & 121S rotating lights are designed for mounting on a flat horizontal
or vertical surface or on a 1/2" NPT threaded pipe. Mounting on a vertical surface with the
lens positioned upward can be accomplished using a separately purchased Federal Signal
wall (Model LWMB2) or corner (Model LCMB2) mounting bracket.
1. Pipe Mounting.
Models 121A & 121S can be mounted on 1/2 inch pipe. Mounting hardware
and installation details are left to the installer.
To prevent the connection from loosening, tighten the fixture to a MINIMUM
torque of 5 ft.-lbs. (6.8N m) after threading it onto the pipe.
2. Surface Mounting.
a.
b.
c.
IV. ELECTRICAL CONNECTIONS.
A. Model 121 12VDC.
The Model 121 is equipped with a plug that fits in standard cigarette lighter
sockets.
Center contact on the cigarette plug is the (+) positive power lead. Polarity MUST
be observed for operation.
B. Model 121A 12 and 24VDC.
The Model 121A direct current unit is supplied with two leads (one red and one
black). Connect the red (+) lead to the positive power source terminal and the black (-) to the
negative power source terminal.
Polarity MUST be observed for operation.
C. Models 121S 120 VAC.
Do not connect if supply wires are energized.
The 121S alternating current units are supplied with three leads (one black, one
white, and one green/yellow) for the AC units. Connect the black lead to the phase side of the
Using the gasket as a template, scribe the three mounting holes and the
center hole for surface mounting. Drill a 3/16" (4.8 mm) diameter hole at
each of the three scribed mounting marks. Drill or punch a 1" (25.4 mm)
diameter hole at the center for the wires.
Set the light on gasket and attach to the mounting surface using the
provided #8-32 screws.
Refer to paragraph E. for electrical connections.
NOTE
NOTE
NOTE
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