MODEL 371ST-250
INSTALLATION AND SERVICE INSTRUCTIONS
FOR COMMANDER
MODEL 371ST-250 STROBE LIGHTS
®
Address all communications and shipments to:
FEDERAL SIGNAL CORPORATION
Electrical Products Division
Service Department
2645 Federal Signal Drive
University Park, IL 60466-3195
INSTALLATION AND SERVICE INSTRUCTIONS
FOR COMMANDER
MODEL 371ST-250 STROBE LIGHTS
SAFETY MESSAGE TO INSTALLERS,
USERS AND MAINTENANCE PERSONNEL
It is important to follow all instructions shipped with this product. This device is to be installed by
a trained electrician who is thoroughly familiar with the National Electric Code/Canadian Electric
Code and will follow the NEC/CEC Guidelines as well as local codes.
The selection of mounting location for the device, its controls and the routing of the wiring is to be
accomplished under the direction of the facilities engineer and the safety engineer. In addition,
listed below are some other important safety instructions and precautions you should follow:
• Read and understand all instructions before installing or operating this equipment.
• Do not connect this light to the system when power is on.
• After installation, ensure that the threaded dome ring joint is fully engaged.
• After installation, test the light system to ensure that it is operating properly.
• After testing is complete, provide a copy of this instruction sheet to all operating personnel.
• Establish a procedure to routinely check the light installation for integrity and proper operation.
Failure to follow all safety precautions and instructions may result in property damage, serious
injury, or death to you and others.
I. INSTALLATION.
A. Unpacking.
After unpacking the light, examine it for damage that may have occurred in transit. If the
equipment has been damaged, do not attempt to install or operate it. File a claim immediately with the carrier stating the extent of the damage. Carefully check all envelopes,
shipping labels, and tags before removing or destroying them.
B. Mounting (see figure 1).
The Model 371ST lights are designed for mounting on a flat horizontal surface or on a 1" NPT
pipe. For surface mounting on solid substrates, a separately purchased Model 371BRCKT (3point mounting bracket) may be used. If conduit side entries are to be used, disassemble light
as described in section I.D.1 and remove knockout(s) with a blunt tool prior to mounting light.
Use a file to remove excess flash around the knockout.
1. Pipe Mounting.
a. Attach light to pipe by turning clockwise.
b. Refer to section D for information on making electrical connections.
2. Surface Mounting.
a. Using the gasket as a template, scribe four drill position marks on the mounting surface.
Drill a 9/32” (7.1mm) diameter hole at each of the outside drill position marks for
mounting. Drill or punch a 1-3/8” (34.9mm) diameter hole at the center drill position
mark for wire entry.
b. Attach 1” NPT conduit or suitable user supplied 1” NPT hub or connector to conduit
entrance in bottom of light.
c. Set light on gasket and attach to the mounting surface using the provided 1/4” screws
and washers.
d. Refer to section D for information on making electrical connections.
®
C. Specifications.
Operating Voltage 225-300 VDC
Operating Current 0.25A
Energy Output 10.0 Joules
Flash Rate 60 FPM
Environmental Ratings Type 4X, IP66
D. Electrical Connections (see figure 2).
The model 371ST comes assembled from the factory. Models are supplied with a two power
leads for wiring to the supply circuit. If conduit side entries are to be used or if the housing is
to be used as a junction box perform the following steps:
WARNING
To avoid electrical shock hazards, do not connect to supply circuit when power is
applied.
1. Disassemble the light as follows:
a. Remove dome assembly by grasping the die-cast ring attached to the dome and turning
it counter-clockwise.
b. Remove three #10 hex head screws that secure strobe-spinning assembly to housing.
c. Remove strobe-spinning assembly.
2. If conduit side entries are to be used, attach either Myers STNTB-2 or T&B H075-TBH 3/4"
N.P.T. conduit hub with 3/4" N.P.T. close nipple (all user-supplied) to housing and tighten
securely. When side entries are used, the bottom 1" NPT conduit entry must be plugged
with a threaded plug (user-supplied).
3. Route supply wires (12AWG to 16AWG) into housing. Connect the red (+) lead to the
positive power source lead and the black (-) lead to the negative power source lead.
NOTE
Polarity MUST be observed for proper operation.
4. Re-assemble the light and test for proper operation.
II. MAINTENANCE.
SAFETY MESSAGE TO
MAINTENANCE PERSONNEL
Listed below are some important safety instructions and precautions you should follow:
• Read and understand all instructions before operating this system.
• Any maintenance to the light system must be done with the power turned off.
• Any maintenance to the light system must be performed by a trained electrician in accordance
with NEC/CEC Guidelines and local codes.
• Never alter the unit in any manner. Safety may be endangered if additional openings or other
alterations are made to units.
• The nameplate, which contains cautionary or other information of importance to maintenance
personnel, should not be obscured.
• If the dome is damaged in any way, the complete dome assembly MUST be replaced.
• After performing any maintenance, test the light system to ensure that it is operating properly.
A. Flashtube Replacement (see figure 3).
After extended operation, occasionally check for flash tube degradation. Should the flash tube
misfire, have a noticeable decrease in light output, glow continuously or darken- replacement
is necessary.
-2-
WARNING
HIGH VOLTAGES ARE PRESENT INSIDE THE LIGHT ASSEMBLY. WAIT AT LEAST 5
MINUTES AFTER SHUTTING OFF POWER BEFORE SERVICING THIS UNIT.
To replace strobe tube, proceed as follows:
1. Remove the dome assembly by grasping the die-cast ring attached to the dome and turning
it counter-clockwise. If difficulty occurs removing the dome assembly, place a screwdriver
blade against one of the four bosses on the die-cast ring attached to the dome. Gently tap
the screwdriver handle to loosen the dome assembly from the housing.
WARNING
To maintain the watertight enclosure, do not damage dome or threads while disassembling or
reassembling the unit. Lubricated threaded joints exposed for long periods of time may attract
small particles of dirt or other foreign materials. Re-assemble joint immediately after
performing maintenance.
2. Remove the two #8 screws retaining the fresnel lens to it’s mounting base and lift the lens
off the metal spinning.
3. Carefully remove the flash tube from its socket by grasping the connector and lifting
upwards using a slight rocking motion.
4. See replacement parts table (Section IIB) for a complete list of Federal Signal lamps that
are available. Install a new flash tube by fully seating it into the socket.
5. Reassemble the unit.
6. Test light for proper operation.
B. Replacement Parts.
Description Part No.
Glass Dome Assembly, Amber K8459126A
Glass Dome Assembly, Blue K8459126A-01
Glass Dome Assembly, Red K8459126A-02
Fresnel lens, Clear K8422B428A
Gasket, dome ring K8459123A
Gasket, surface mount K8459127A
Flash Tube K149122B
Printed circuit board assy., 250VDC K2001070B
C. Accessories.
Description Part No.
Mounting Bracket, Surface 371BRCKT
Conduit hub kit, 3/4" NPT K8459138A
Close-up plug, 1" NPT K8459130A
III. SERVICE.
The Federal factory will service your equipment or provide technical assistance with any
problems that cannot be handled locally.
Any units returned to Federal Signal for service, inspection, or repair must be accompanied by a
Return Material Authorization. This R.M.A. can be obtained from a local Distributor or
Manufacturer’s Representative.
At this time a brief explanation of the service requested, or the nature of the malfunction, should
be provided.
Address all communications and shipments to:
FEDERAL SIGNAL CORPORATION
Electrical Products Division
Service Department
2645 Federal Signal Drive
University Park, IL 60466-3195
-3-
1" NPT PIPE
PIPE MOUNT SURFACE MOUNT
371 LIGHT
ASSEMBLY
GASKET
DRILL (3) 9/32"
(7.143 mm) HOLES
MOUNTING
SURFACE
1/4" FLATWASHERS
1/4" SCREWS
Figure 1.
-4-
290A3948
DOME
ASSEMBLY
DIE CAST
RING
SCREWS, #10
HEX HEAD (3)
STROBE
SPINNING
ASSEMBLY
GASKET
GROUND
SCREW
TURN DIE CAST RING
COUNTER-CLOCKWISE
TO REMOVE
A
CONDUIT HUB
(USER SUPPLIED)
CONDUIT NUT
(USER SUPPLIED)
Figure 2.
-5-
BASE
CONDUIT PLUG
(USER SUPPLIED)
290A3949
DOME
ASSEMBLY
DIE CAST
RING
FRESNEL
LENS
#8 SCREWS (2)
TURN DIE CAST RING
COUNTER-CLOCKWISE
FLASH TUBE
METAL
SPINNING
TO REMOVE
BASE
290A3950
Figure 3.
-6-
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