Federal Signal 371DST Users Manual

Model 371DST Commander

Strobe Lights for

Hazardous Locations

Installation and

Maintenance Manual

®

256A504H
REV. H1 114
Printed in USA.

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Installation and Service Instructions for Commander®

Model 371DST Strobe Lights

for Use in Hazrdous Locations

Safety Message to Installers,

Users and Maintenance Personnel

This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D; Class II, Division 2;
Class 3 or non-hazardous locations only.

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.

• To reduce the risk of ignition of hazardous atmospheres, disconnect the fixture from the supply circuit

before opening. Keep tightly closed when in operation.

• The strobe housing is not be used as a raceway for through branch circuit conductors.

• 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
the extent of the damage. Carefully check all envelopes, shipping labels, and tags before removing or
destroying them.

B. Mounting (see Figure 1).

CAUTION

To reduce the risk of fire or explosion, do not install in hazardous location if the operating
temperature exceeds the hazardous atmosphere’s ignition temperature. Refer to the product
nameplate for operating temperature markings.

The Model 371DST 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 (3-point
mounting bracket) may be used. When using Model 371BRCKT, the bottom 1” NPT conduit entry
of the light must be plugged with the 1” NPT close-up plug provided with the kit. If conduit side
entry is to be used, disassemble light as described in section ID.1 and remove knockout with a
blunt tool prior to mounting light. Use a file to remove excess flash around the knockout.

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immedi ately with the carrier stating

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”

(7.1 mm) diameter hole at each of the outside drill position marks for mounting. Drill or punch a 1-3/8”
(34.9 mm) diameter hole at the center drill position mark for wire entry.

Attach 1” NPT conduit or suitable user supplied 1” NPT hub or connector to conduit entrance in

b.

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 12-24VDC 120 VAC 50/60 Hz

Operating Current 2.10A 0.60A

Energy Output 10.0 joules 10.0 joules

Flash Rate 72-88 FPM 72-88 FPM

Operating Temperature -31°F to 104°F -31°F to 104°F
(-35°C to 40°C) (-35°C to 40°C)

Approvals UL, cUL UL, cUL

Environmental Ratings Type 4X, IP66 Type 4X, IP66

D. Electrical Connections (see Figure 2)

The Model 371DST comes assembled from the factory with three color-coded leads for wiring to a
junction box. If desired, the factory leads can be removed and the supply connections can be directly
made to the terminal block located on the backside of the mounting bracket as described below.

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.

d. If desired, remove the factory field wiring leads from the terminal block.

2. If conduit side entry is 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 using side entry, the bottom 1” NPT conduit entry must be plugged with a UL listed threaded
plug (user-supplied).

3. Route supply wires (10 AWG to 16 AWG) into the housing.

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4. Strip a maximum of .28” (7 mm) of wire insulation from the ends of the power leads. Connect wires to

terminal block by inserting the stripped ends of the wire into the connector as far as they can travel and
tightening the clamping screw (max. tightening torque = 7.0 in-lbs {.8 N-m}).

NOTE

For DC models, polarity must be observed for proper operation. Connect the positive power supply

lead to the (+) terminal and the negative power supply lead to the (-) terminal.

5.

Connect earth ground to terminal block and green ground screw located in housing.

6. 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.

WARNING: EXPLOSION HAZARD—Substitution of any component may impair suitability

•

for Class I, Division 2, Groups A, B, C and D; Class II, Division 2; Class 3 or non-hazardous
locations.

• EXPLOSIONHAZARD—Donotdisconnectequipmentunlesspowerhasbeenswitchedoffor

theareaisknowntobenon-hazardous.

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.

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:

Remove the dome assembly by grasping the die-cast ring attached to the dome and turning it

1.
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.

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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ash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ashtubebyfullyseatingitintothesocket.

5. Reassemble the unit.

6. Test light for proper operation.

B. Replacement Parts.

Description Part No.
Dome Assembly, Polycarbonate, Amber K8459125
Dome Assembly, Polycarbonate, Blue K8459125-01
Dome Assembly, Polycarbonate, Clear K8459125-02
Dome Assembly, Polycarbonate, Green K8459125-03
Dome Assembly, Polycarbonate, Red K8459125-04
Inner Lens, Polycarbonate Clear K8422B428
Dome Ring Gasket K8459123
Surface-Mount Gasket K8459127
Strobe Tube K8107178
Printed Circuit Board Assy., 12-24VDC K2001265-01
Printed Circuit Board Assy., 120VAC K200865-02

C. Optional Accessories.

Description

Part No.

Mounting Bracket, Surface 371BRCKT
Conduit hub kit, 3/4” N.P.T. K8459138
Close-up plug, 1” N.P.T. K8459130

III. SERVICE

The Federal Signal 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:

Industrial Systems

2645 Federal Signal Drive • University Park, IL 60484-3167
Tel.: [phone] • 1-877-289-3246 • Fax: [phone]
www.federalsignal-indust.com • www.fs-isys.com

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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

5

290A3944

DOME
ASSEMBLY

DIE CAST
RING

SCREWS, #10
HEX HEAD (3)

TURN DIE CAST RING

COUNTER-CLOCKWISE

TO REMOVE

.28"

(7mm)

STROBE
SPINNING
ASSEMBLY

GASKET

GROUND
SCREW

CONDUIT HUB
(USER SUPPLIED)

CONDUIT NUT

(USER SUPPLIED)

A

Figure 2

A

TERMINAL

BASE

CONDUIT PLUG

(USER SUPPLIED)

BLOCK

290A3945

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