Federal Signal Corporation Commander 371ST-250 Manual

256820E
REV. E 811
Printed in U.S.A.
Commander®
Strobe Warning Light
Model 371ST-250
Installation and
Maintenance Manual

Warranty – Seller warrants all goods for ve years on parts and 2-1/2 years
on labor, under the following conditions and exceptions: Seller warrants that
all goods of Seller's manufacture will conform to any descriptions thereof for
specications which are expressly made a part of this sales contract and at the
time of sale by Seller such goods shall be commercially free from defects in
material or workmanship. Seller reserves the right at the Seller’s discretion
to “Repair and Return” or “Replace” any item deemed defective during the
warranty period. This warranty does not cover travel expenses, the cost of
specialized equipment for gaining access to the product, or labor charges for
removal and reinstallation of the product. This warranty shall be ineffective
and shall not apply to goods that have been subjected to misuse, neglect,
accident, damage, improper maintenance, or to goods altered or repaired by
anyone other than Seller or its authorized representative, or if ve years have
elapsed from the date of shipment of the goods by Seller with the following
exceptions: lamps and strobe tubes are not covered under this warranty.
Outdoor warning sirens and controllers manufactured by Federal Warning Sys-
tems are warranteed for two years on parts and one year on labor. No agent,
employee, representative or distributor of Seller has any authority to bind the
Seller to any representation, afrmation, or warranty concerning the goods
and any such representation, afrmation or warranty shall not be deemed to
have become a part of the basics of the sales contract and shall be unenforce-
able. THE FOREGOING WARRANTIES ARE EXCLUSIVE AND IN LIEU
OF ALL OTHER WARRANTIES OR MERCHANTABILITY, FITNESS
FOR PURPOSE AND OF ANY OTHER TYPE, WHETHER EXPRESS
OR IMPLIED. These warranties shall not apply unless Seller shall be given
reasonable opportunity to investigate all claims for allegedly defective goods.
Upon Seller's instruction a sample only of allegedly defective goods shall be
returned to Seller for its inspection and approval. The basis of all claims for al-
leged defects in the goods not discoverable upon reasonable inspection thereof
pursuant to paragraph 8 hereof must be fully explained in writing and received
by Seller within thirty days after Buyer learns of the defect or such claim shall
be deemed waived.
Industrial Systems
2645 Federal Signal Drive • University Park, IL 60484-3167
Tel: [phone] • Fax: [phone]
Email: [e-mail] • www.federalsignal-indust.com

Model 371ST-250 Strobe Light 3
Contents
Safety Messages to Installers .......................................................... 5
An Overview of Model 371ST-250..................................................... 6
Unpacking the Light.......................................................................... 6
Mounting the Light ............................................................................ 7
Pipe Mounting the Light .......................................................... 8
Surface Mounting the Light ..................................................... 8
Wiring the Light ................................................................................. 9
Safety Messages to Maintenance Personnel ................................ 11
Replacing the Flash Tube................................................................ 12
Cleaning the Dome.......................................................................... 14
Getting Service, Assistance, and Parts ......................................... 14
Repair Service ....................................................................... 14
Technical Assistance ............................................................... 14
Accessories and Replacement Parts ....................................... 15
Tables
Table 1 Electrical and environmental ratings......................................7
Table 2 Dimensions............................................................................7
Table 3 Replacement parts ..............................................................15
Table 4 Accessories ......................................................................... 15

4Model 371ST-250 Strobe Light
Contents
Figures
Figure 1 Mounting options .................................................................8
Figure 2 Dome and lens assembly removed ...................................10
Figure 3 Flash tube replacement..................................................... 13

5
Installation and Maintenance Instructions
Model 371ST-250 Strobe Light
Safety Messages to Installers
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 Electrical Code and/
or Canadian Electrical Code and will follow the NEC and/or
CEC Guidelines as well as all local codes. This light should be
considered a part of the warning system and not the entire warning
system.
The selection of the mounting location for the light, its controls
and the routing of the wiring are 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 light.
• Do not connect this light to the system when power is on.
• After installation, make sure that all set screws and threaded
joints are properly tightened.
• After installation, test the light to make sure that it is
operating properly.
• After testing is complete; provide a copy of this instruction
booklet to all personnel.
• Establish a procedure to routinely check the light for proper
activation and operation.
Failure to follow all safety precautions and instructions may result
in property damage, serious injury, or death.

6
Installation and Maintenance Instructions
Model 371ST-250 Strobe Light
An Overview of Model 371ST-250
The Federal Signal Model 371ST is a single-ash strobe housed
in a Type 4X enclosure. At 60 ashes per minute and 275 effective
candela, the Commander® is the largest strobe signal in the Federal
Signal product line.
The 371ST-250 features a heat resistant glass dome available in
three colors: amber, blue, and red. The letter (A, B, or R) after the
model number 371ST-250 represents the dome color. The dome-
and-ring assembly screws on for easy access to the strobe tube and
printed circuit board assembly.
The base of the Commander features textured black powder paint
for greater corrosion resistance. Wiring can be routed through
the pipe-mount opening in the bottom of the light or the side
knockouts can be used for side entry wiring. Installation can be
surface or 1-inch NPT pipe mount. Optional wall and corner
mount brackets are available for the 371ST. The Commander is
rated Type 4X, IP66 (watertight, dust tight, corrosion resistant).
The LWMB2 wall-mount bracket and the LCMB2 corner-mount
bracket can be used to mount the Model 271ST-250. For surface
mounting on solid substrates, the separately purchased Model
371BRCKT three-point surface-mount bracket is available.
Unpacking the Light
After unpacking the Model 371ST-250, examine it for damage that
may have occurred in transit. If the light 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 discarding
them. Disposal of all shipping materials must be carried out in
accordance with national and local codes and standards. If any
parts are missing, please call Federal Signal Customer Support at
708-534-4756.

7
Installation and Maintenance Instructions
Model 371ST-250 Strobe Light
Table 1 Electrical and environmental ratings
Operating Voltage: 225 Vdc to 300 Vdc
Operating Current: 0.25 A
Energy Output: 10.0 J
Flash Rate: 60 FPM
Candela, Peak
1:625,000
ECP
2:275
Lamp Life: 10,000 Hours
Light Source: Strobe Tube
Operating Temperature: –31 °F to 150 °F
(–35 °C to 66 °C)
Environmental Ratings: Type 4X, IP66
1 Peak candela is the maximum light intensity generated by
a ashing light during its light pulse.
2ECP (Effective Candela) is the intensity that would
appear to an observer if the light were burning steadily.
Table 2 Dimensions
Height: 11.38 in (289.0 mm)
Diameter: 9.13 in (231.9 mm)
Net Weight: 10.0 lb (4.54 kg)
Shipping Weight: (12.4 lb) 5.62 kg
Mounting the Light
The Model 371ST-250 light is designed for mounting on a at
horizontal surface or on a 1" NPT pipe. If conduit side-entries
are to be used, disassemble the light as described in “Wiring the
Light” on page 9 and remove one or more knockouts with a blunt
tool before mounting the light. Use a le to remove excess ash
around the knockout.

8
Installation and Maintenance Instructions
Model 371ST-250 Strobe Light
Figure 1 Mounting options
371ST-250 LIGHT
ASSEMBLY
PIPE MOUNT
PIPE MOUNT SURFACE MOUNT
GASKET
MOUNTING
SURFACE
1/4" FLATWASHERS
DRILL THREE 9/32"
(7.143 mm) HOLES
1/4" SCREWS
1" NPT
PIPE
290A3948B
Pipe Mounting the Light
Attach the light to the 1-inch NPT pipe by threading the light
clockwise on the pipe (Figure 1). For information on making
the electrical connections, see “Wiring the Light on page 9.”
Surface Mounting the Light
To mount the light on a at surface:
1. Using the gasket as a template, scribe four drill-position
marks on the mounting surface (Figure 1).
2. Drill a 9/32" (7.1 mm) diameter hole at each of the outside
drill position marks for mounting.
3. Drill or punch a 1-3/8" (34.9 mm) diameter hole at the
center drill-position mark for the wire entry.

9
Installation and Maintenance Instructions
Model 371ST-250 Strobe Light
4. Attach 1" NPT conduit or a suitable user-supplied 1" NPT
hub or connector to the conduit entrance in the bottom of
the light.
5. Set the light on the gasket and attach it to the mounting
surface with the provided 1/4" screws and washers.
6. For information on making the electrical connections, see
the next section.
Wiring the Light
SHOCK HAZARD
To avoid electrical shock hazards, do not connect wires while
power is applied.
The Model 371ST-250 comes assembled from the factory. Models
are supplied with two power leads for wiring to the supply circuit.
If you are using conduit side entries or if you are using the housing
as a junction box, perform the following steps:
1. Disassemble the light:
a) Remove the dome assembly by grasping the die-cast ring
attached to the dome and turning it counter-clockwise.
b) Remove the three #10 hex-head screws that secure the
strobe-spinning assembly to the housing.
c) Remove the strobe-spinning assembly.
2. If you are using conduit side-entries, attach a Myers®
STTTB-2 or a T&B® H075TBH 3/4-inch NPT conduit hub
with a 3/4-inch NPT close nipple (both user-supplied) to
the housing and tighten the hub securely. When side entries
are used, the bottom 1-inch NPT conduit entry must be
plugged with a threaded plug (user-supplied). (See Table 4:
Accessories on page 15).
NOTE: Polarity MUST be observed for proper operation.

10
Installation and Maintenance Instructions
Model 371ST-250 Strobe Light
Figure 2 Dome and lens assembly removed
DOME ASSEMBLY
DIE CAST RING
GASKET
GROUND SCREW
STROBE SPINNING
ASSEMBLY
SCREWS, #10
HEX HEAD (3)
BASE
TURN DIE-CAST RING
COUNTER-CLOCKWISE
TO REMOVE
290A3949B
A
CONDUIT HUB
(USER SUPPLIED)
CONDUIT NUT
(USER SUPPLIED)
CONDUIT PLUG
(USER SUPPLIED)