PRODUCT SPECIFICATION
904 & 924 Horn Strobe Appliance
ACTION MESSAGES
ADA
SYSTEMS
COMMUNICATIONS
Audible Strobe Appliance
Description
DMP’s two wire 924 Series Horn Strobe Appliances and
904 Horns offer more features with Less Current and Zero
Inrush. The Horn provides a Selectable choice of either a
continuous horn tone or temporal pattern (code 3) tone
when constant voltage from a Fire Alarm Control Panel
(FACP) is applied. Each tone has 3 dBA settings to choose
from. All models (Horn only or Horn/strobe) may be
Synchronized when used in conjunction with the 831 or 832
Sync Modules or 508 Power Supply with Sync Protocol.
Additionally, the Horn may be silenced while maintaining
strobe activation on combination 924 Series units.
• LOW CURRENT and ZERO INRUSH.
• Selectable Continuous Horn or Temporal (code 3)
Tones.
• 3 Selectable dBA levels in both tones.
• Continuous Tone:
Anechoic: 90, 95, or 99 dBA
Reverberant 82, 88, or 91 dBA
• Temporal (Code 3) Tone:
Anechoic: 90, 95, or 99 dBA
Reverberant: 75, 82 or 85 dBA
The 924 Series Horn Strobes and 904 Horns are designed
for maximum performance, reliability, and cost-effectiveness
while meeting or exceeding the latest requirements of NFPA
72 (National Fire Alarm Code), ANSI 117.1 (American
National Standard for Accessible and Usable Buildings and
Facilities), UL Standard 1971 (Standard for Signaling Devices
for The Hearing Impaired), and UL 464 (Audible Signal
Appliances). 924 Series Horn Strobe Appliances, when
properly specified and installed in accordance with NFPA/
ANSI standards can provide the Equivalent Facilitation
allowed under ADA Accessibility Guidelines (ADAAG
General Section 2.2) by meeting or exceeding the illumination
which results from the ADA specified strobe intensity of 75
candela at 50 feet. This is an illumination of .030 lumens per
square foot.
• Approvals Include: Underwriters Laboratories UL 1971
and UL464 Listings, FCC Part 15, and California State
Fire Marshal (CSFM).
• ADA/NFPA/ANSI compliant. Meets OSHA 29 Part
1910.165.
• Wall mount available in 15, 15/75, 30, 75 and 110
candela intensity.
904 Horn
924 Horn/Strobe
When used with the DMP Series 831 or 832 Sync Module ,
synchronization of the continuous horn tone produces the
temporal (code 3) tone (required by NFPA-72 (1999)
simultaneously for all horn appliances. This ensures a
distinct temporal (code 3) pattern when multiple horns are
within hearing distance. If not synchronized the temporal
sound could overlap and not be distinctive. At the same time
the strobes will be synchronized. This provides the ability to
comply with ADA recommendations concerning
photosensitive epilepsy and NFPA standards when installing
multiple visual appliances within the field of view. All of this
plus the ability to silence the Horn is achieved by using only
TWO WIRES.
• All models can be Synchronized by adding the 831 or
832 Sync Modules to the NAC circuit.
• Sync the Horn — Maintain the Temporal Pattern
(code 3) when multiple appliances are in an area.
Meets NFPA requirement for Temporal Evacuation
Notification.
• Sync the Strobe — Maintain True 1 Flash per second
when using multiple visual appliances within the field of
view. Meets ADA and NFPA.
• Ability to Silence the Horn while maintaining the strobe
flash.
Quick Reference Guide
Model
Number
904
904WP
924-15W
924-1575W
924-30W
924-75W
924-110W
924-15C
924-30C
924-75C
924-100C
Wall
Mount
X
X
X
X
X
X
X
Ceiling Strobe
Mount Candela
X
X
15
15/75
30
75
110
X
15
X
30
X
75
X
100
Non-Sync
Sync
X
X
X
X
X
X
X
X
X
X
X
24 VDC
X
X
X
X
X
X
X
X
X
X
X
• Ceiling mount available in 15, 30, 75 and 100 candela
intensity.
2841 E. Industrial Drive Springfield, MO 65802-6310 800-641-4282
LT-0556 (6/00)
Ordering Information
Audible Appliances Wall Mount (24V)
Input
Strobe
Model
Description
Voltage Candela
904-81
Horn
24 VDC
-904-51
Horn
24 VDC
-904WP-81
Horn Weather-proof 24 VDC
-Audible Strobe Appliances Wall Mount (24V)
Strobe
Model
Description
Candela
924-15W-81
Audible Strobe
24 VDC
15
924-15W-51
Audible Strobe
24 VDC
15
924-1575W-81
Audible Strobe
24 VDC
15/75
924-1575W-51
Audible Strobe
24 VDC
15/75
924-30W-81
Audible Strobe
24 VDC
30
924-30W-51
Audible Strobe
24 VDC
30
924-75W-81
Audible Strobe
24 VDC
75
924-75W-51
Audible Strobe
24 VDC
75
924-110W-81
Audible Strobe
24 VDC
110
924-110W-51
Audible Strobe
24 VDC
110
Audible Strobe Appliances Ceiling Mount (24V)
Strobe
Model
Description
Candela
924-15C-51
Audible Strobe
24 VDC
15
924-30C-51
Audible Strobe
24 VDC
30
924-75C-51
Audible Strobe
24 VDC
75
924-100C-51
Audible Strobe
24 VDC
100
Specifications
Color
Red
White
Red
Color
Red
White
Red
White
Red
White
Red
White
Red
White
Color
White
White
White
White
Warning: Please read these specifications and associated
Installation Instructions carefully before using, specifying or
applying this product. Failure to comply with any of these
instructions, cautions and warnings could result in improper
application, installation and/or operation of these products in
an emergency situation, which could result in property damage,
and serious injury or death to you and/or others.
General Notes:
• Strobes are designed to flash at 1 flash per second
minimum from 20-31VDC. Note that NFPA-72 (1999)
specifies a flash rate of 1 to 2 flashes per second and
ADA Guidelines specify a flash rate of 1 to 3 flashes per
second.
• All candela ratings represent minimum effective Strobe
intensity based on UL 1971.
• 924 Series Strobe appliances are UL 1971 for indoor use
with a temperature range of 320 F to 1200 F (00 C to 490
C) and maximum humidity of 85%.
• 904 Horns are listed under UL 464 for audible signal
appliances (Indoor use only).
• 904 Horns are listed under UL 464 for indoor/outdoor
use with a temperature range of -310F to 1500F (-350C to
660C) maximum humidity of 95%.
Average current per actual production testing at 20, 24, and
31 VDC. For rated average, peak and inrush current across
the UL listed voltage range for both filtered DC and unfiltered
VRMS, see installation instructions.
924 Series Average Current Wall Mount Appliances (24 VDC)
Hi dBA Setting (99 dBA)
Voltage
924-15W 924-1575W 924-30W 924-75W 924-110W
20 VDC
0.088
0.105
0.128
0.200
0.230
24 VDC
0.087
0.102
0.120
0.177
0.202
31 VDC
0.090
0.100
0.119
0.152
0.183
Med dBA Setting (95 dBA)
Voltage
924-15W 924-1575W 924-30W 924-75W 924-110W
20 VDC
0.074
0.089
0.116
0.184
0.216
24 VDC
0.072
0.083
0.105
0.156
0.183
31 VDC
0.067
0.077
0.092
0.130
0.158
Low dBA Setting (90 dBA)
Voltage
924-15W 924-1575W 924-30W 924-75W 924-110W
20 VDC
0.070
0.084
0.111
0.178
0.210
24 VDC
0.064
0.077
0.098
0.149
0.177
31 VDC
0.058
0.067
0.084
0.117
0.148
924 Series Average Current Ceiling Mount Appliances (24 VDC)
Hi dBA Setting (99 dBA)
Voltage
924-15C
924-30C
924-75C
924-100C
20 VDC
0.105
0.147
0.291
0.323
24 VDC
0.102
0.135
0.250
0.277
31 VDC
0.102
0.132
0.204
0.245
Med dBA Setting (95 dBA)
Voltage
924-15C
924-30C
924-75C
924-100C
20 VDC
0.091
0.134
0.273
0.308
24 VDC
0.086
0.120
0.226
0.258
31 VDC
0.079
0.104
0.182
0.217
Low dBA Setting (90 dBA)
Voltage
924-15C
924-30C
924-75C
924-100C
20 VDC
0.087
0.129
0.265
0.301
24 VDC
0.077
0.113
0.219
0.252
31 VDC
0.069
0.096
0.168
0.207
904 Series Average Current Wall Mount Appliances (24 VDC)
Hi dBA Setting (99 dBA)
Voltage
904
904WP
20 VDC
0.035
0.035
24 VDC
0.041
0.041
31 VDC
0.053
0.053
Med dBA Setting (95 dBA)
Voltage
904
904WP
20 VDC
0.020
0.020
24 VDC
0.024
0.024
31 VDC
0.030
0.030
Low dBA Setting (90 dBA)
Voltage
904
904WP
20 VDC
0.014
0.014
24 VDC
0.017
0.017
31 VDC
0.021
0.021
904 & 924 Audible dBA Ratings
Description
Continuous
Horn
CODE 3
Horn
Volume
Reverberent dBA
per UL 464 @ 10 ft.
High
Med
Low
High
Med
Low
24 VDC
91
88
82
85
82
75
Anechoic dBA
@ 10 ft.
24 VDC
99
95
90
99
95
90
904 & 924 Series Product Specification
Digital Monitoring Products
2841 E. Industrial Drive Springfield, MO 65802-631- 800-641-4282
Mounting Options
DMP Model 841, NATP, Option H
DMP Model 842 SHBB surface backbox, Option X
DMP Model 845 WBB backbox, Option K (WP model only)
DMP Model 846, BB Backbox, Option J
Single gang, flush mount, Option B
4" Square, flush mount, Option D
4" square, deep, flush mount, Option E
Double gang, flush mount, Option F
Double gang, surface mount, Option G
RP-R retrofit plate, Option O (Wall only)
SFP semi-flush plate, Option R
AP adapter plate, Option S
4 11/16" square, deep, surface mount, Option V (ceiling only)
Refer to LT-0459 Fire Notificaton Mounting Accessories
Wiring Diagrams
FROM PRECEDING APPLIANCE
OR FIRE ALARM CONTROL PANEL +
+
+
-
SIGNAL
904 or 924 Appliances Non-synchronized
Strobe
NAC
circuit
Class B circuit
831
+ STROBE
- STROBE
+ OUT
FACP
Warning: Contact DMP for Installation Instructions and
General Information sheets on these products. These
documents do undergo periodic changes. It is important
that you have current information on these products. These
materials contain important information that should be read
prior to specifying or installing these products, including:
924
EOLR
Audible
NAC
circuit
- AUDIBLE
924 Synchronized with Audible SilenceFeature
832
+ SYNC
• Conductor size (AWG), length and capacity should be
taken into consideration prior to design and installation
of these products, particularly in retrofit installations.
+ OUT
1
+ IN 1
924
924
904
924
924
904
MINUS 1
+ AUDIBLE
- AUDIBLE
• The voltage applied to these products must be within
their rated input voltage range.
• Failure to comply with the installation instructions or
general information sheets could result in improper
installation, application, and/or operation of these
products in an emergency situation, which could result
in property damage and serious injury or death to you
and/or others.
Class A circuit
- SYNC
Audible NAC
circuit out
• Composite flash rate from multiple strobes within a
person’s field of view.
• Use only on circuits with continuously applied
operating voltage. Do not use strobe on coded or
interrupted circuits in which the applied voltage is
cycled on and off as the strobe may not flash.
EOLR
904
+ AUDIBLE
• Fuse ratings on notification appliance circuits to
handle peak currents from all appliances on those
circuits.
• Installation in office areas and other specification and
installation issues.
924
- OUT
• Total current required by all appliances connected to
system primary and secondary power sources.
• Installation of 110 candela strobe products in sleeping
areas.
TO NEXT APPLIANCE
OR END-OF-LINE RESISTOR
+ OUT 2
+ IN 2
FACP
Audible NAC
circuit return
MINUS 2
904 & 924 Synchronized without Audible Silence Feature
Audible NAC Circuit
832
924
924
904
-
924
924
904
832
924
924
-
924
924
832
924
924
904
924
924
904
Strobe NAC Circuit
+
FACP
Audible NAC Circuit
SYNC
Strobe NAC Circuit
+
SYNC
Audible NAC Circuit
Strobe NAC Circuit
+
-
SYNC
904 & 924 Synchronized with Multiple Sync Modules
Note: Models 904 and 924 must be set on Code 3 horn tone
to achieve synchronized Temporal (Code 3) tone and
connected to the Sync Module or the 508 Power Supply with
Sync Protocol.
904 & 924 Series Product Specification
2841 E. Industrial Drive Springfield, MO 65802-631- 800-641-4282
Digital Monitoring Products
DMP products must be used within their published
specifications and must be PROPERLY specified, applied,
installed, operated, maintained and operationally tested in
accordance with their installation instructions at the time of
installation and at least twice a year or more often and in
accordance with local, state and federal codes, regulations
and laws. Specification, application, installation, operation,
maintenance and testing must be performed by qualified
personnel for proper operation in accordance with all of the
latest National Fire Protection Association (NFPA),
Underwriters’ Laboratories (UL), National Electrical Code
(NEC), Occupational Safety and Health Administration
(OSHA), local, state, county, province, district, federal and
other applicable building and fire standards, guidelines,
regulations, laws and codes including, but not limited to, all
appendices and amendments and the requirements of the
local authority having jurisdiction (AHJ).
Architects and Engineers Specifications
The notification appliances shall be DMP’s 924 Series Horn
Strobe and Series 904 Horn appliances; and when
synchronization is required the companion 831 and 832
Sync Module(s), or approved equals. 924 Series appliances
and 831 or 832 Sync Module(s) shall be listed under UL
Standard 1971 (Emergency Devices for the Hearing Impaired
for Indoor Fire Protection Service). 904 Horn shall be UL
listed under Standard 464 (Fire Protective Signaling). 924
Series, 904, 831 and 832 shall be certified to meet FCC part
15, Class B.
The appliances shall be designed for 2-wire operation and
shall provide either a continuous or temporal (Code 3) tone
when constant voltage from a Notification Appliance Circuit
(NAC) of the Fire Alarm Control Panel (FACP) is applied or
synchronized temporal (Code 3) tone and synchronized
strobe when used in conjunction with the 831 or 832 Sync
Module(s) or DMP’s 508 Power Supply with Sync Protocol.
maximum allowable average current at 24VDC for wall
mount shall be 87mA @ 15cd, 102mA@ 15/75cd, 120mA@
30cd, 177mA @ 75cd and 202mA@ 110cd. The maximum
allowable average current at 24 VDC for ceiling mount shall
be 102 mA @ 15 cd, 135 mA @ 30 cd, 250 mA @ 75 cd and
277 mA @ 100 Cd. All appliances shall incorporate a zero
inrush circuit design. The strobe shall have a horizontal
plane.
The 831 or 832 Sync Module(s) or DMP’s 508 Power Supply
with Sync Protocol and 924 Series Horn Strobes shall be
designed as a system for continuous activation of the
strobes. Should the Sync Module contacts fail in the passive
state (i.e., contacts remain closed) the strobe shall revert to
a non-synchronized flash rate of 1 flash per second.
The 924 Series and 904 appliances shall be designed for
operation at 24 VDC, over their respective listed voltage
ranges of 20.0 to 31.0 VDC. The units shall be designed for
operation on filtered DC, or unfiltered VRMS. Rated average
current for 924 Series shall depend upon voltage and strobe
intensity; the current shall be as low as .058 amperes for 24
VDC versions. Rated average current for Series 904 (volume
set at high dB output) shall be .041 amperes for 24 VDC
versions.
All versions shall be polarized for DC supervision and shall
incorporate screw terminals for in/out field wiring of #18 to
#12AWG wire size.
The 924 Series and 904 shall incorporate a unique Patented
Universal Mounting Plate which shall allow mounting to
single-gang, double-gang, 4" square, 100mm European
backboxes or DMP’s 842 surface backbox. No additional
trim plate shall be required for flush mounting. If required an
NATP (Notification Appliance Trim Plate) shall be provided.
Dimensions for the 924 Series/904 shall be 4 and 5/8 inches
square by 1 and 1/2 inches deep.
The 924 Series shall be designed so that the audible signal
may be silenced while maintaining strobe activation (when
used with the Series 831 or 832 Sync Module(s) or DMP’s
508 Power Supply which incorporates Sync Protocol. The
831 and 832 Sync Module(s) shall incorporate two inputs
from the Notification Appliance Circuits (NAC) for power
connection from the Fire Alarm Control Panel; one for the
strobe circuit (NAC) and one for the audible circuit (NAC). A
single 2-wire output shall control both the audible and visual
appliances. Upon activation of the audible silence function
of the Fire Alarm Control Panel, the audible signal shall be
silenced while maintaining strobe activation.
Sound output at 10 feet shall be field selectable for 90, 95,
or 99 dBA anechoic for both continuous and temporal (Code
3) tones. 924 Series shall provide listed strobe intensities of
15, 15/75, 30, 75, and 110 candela for wall mount and/or 15,
30, 75 and 100 candela for ceiling mount applications, with
a flash rate of one flash per second minimum across the
listed voltage range. The strobe appliance shall incorporate
a Xenon flashtube enclosed in a rugged Lexan lens. The
Digital Monitoring Products
2841 E. Industrial Drive Springfield, MO 65802-6310 800-641-4282