PRODUCT SPECIFICATION
923 Multi-Candela Horn/Strobe Appliance
ACTION MESSAGES
ADA
SYSTEMS
COMMUNICATIONS
12/24 VDC Audible Notification
Description
The DMP’s 923 Multi-Candela Horn/Strobe Appliance will
satisfy virtually all requirements for indoor, wall mount
applications. The horn portion of the appliance includes a
field selectable continuous horn tone or temporal pattern
(Code 3) with selectable dBA settings of 90 or 95 dBA. The
strobe options include field selectable candela ratings of 15,
30, 75, or 110cd.
•
•
•
•
Low current
Zero inrush
Two selectable tones and dB levels
Candela ratings of 15, 30, 75, and 110cd.
The 923 Multi-Candela may be synchronized when used in
conjunction with the 831 or 832 Sync Modules. Additionally,
the horn may be silenced while maintaining strobe activation.
(Audible will operate only with power applied to both strobe
and audible).
• Wall mount only
• Non-sync and sync in one (synchronization requires the
831 or 832 Sync Module)
• Mounts in DMP Model 842 backbox
The 923 Multi-Candela Horn/Strobe is 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 Building and Facilities) and UL
Standard 1971 (Standard for Signaling Devices for the
Hearing Impaired) and UL 464 (Audible Signaling Appliances).
The strobe appliance, 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 ADA requirements concerning photosensitive
epilepsy.
• Approvals: Underwriters Laboratories UL 1971 and UL
464 Listings, FCC Part 15, and California State Fire
Marshal (CSFM)
• ADA/NFPA/ANSI compliant. Meets OSHA 29 Part
1910.165
2500 N. Partnership Boulevard Springfield, MO 65803
When used with the DMP 831 or 832 Sync Modules, the
continuous horn tone produces a synchronized temporal
(Code 3) tone (mandated by NFPA-72 1999). This ensures a
distinct temporal (Code 3) pattern when 2 or more horns are
within hearing distance. If not synchronized, the temporal
sound could overlap and not be distinctive. At the same time,
the strobes on the circuit may be synchronized. This
provides the ability to comply with ADA recommendations
concerning photosensitive epilepsy and meet NFPA
requirements when installing 2 or more visual appliances
within the field of view. All of this plus the ability to silence
the horn is achieved by using only 2 wires.
• Temperature range of 320 F to 1200 F (00 C to 490 C)
• Maximum humidity of 85% RH
• Three year warranty
Ordering Information
Model
923-MCW-81
923-MCW-51
803-81
803-51
831-81
832-81
www.dmpnet.com
Description
Multi-Candela
Horn/Strobe
Multi-Candela
Horn/Strobe
Horn
Horn
Single Circuit
Sync Module
Dual Circuit
Sync Module
Voltage
Color
24 VDC
Red
24 VDC
White
12/24 VDC
12/24 VDC
Red
White
12/24 VDC
Red
12/24 VDC
Red
Digital Monitoring Products
LT-0558 (3/01)
Warning: Contact Digital Monitoring Products for current
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:
Wiring Diagrams (CONTINUED)
832
Audible
NAC
circuit
out
• Total current required by all appliances connected to
system primary and secondary power sources.
• Fuse ratings on notification appliance circuits to handle
maximum inrush or peak currents from all appliances
on those circuits.
• Composite flash rate from multiple strobes within a
person's field of view.
• The voltage applied to these products must be within
their rated input voltage range.
+ SYNC
- SYNC
+ OUT 1
+ IN 1
MINUS 1
923
923
803
923
923
803
+ AUDIBLE
- AUDIBLE
FACP
Audible
NAC
circuit
return
MINUS 2
+ IN 2
+ OUT 2
923 appliances synchronized with 832 module dual Class A NAC
circuit with no audible silence feature
• Installation of 110 candela strobe products in sleeping
areas.
923 Note: Audible will operate only with power applied to both
strobe and audible.
• Installation in office areas and other specification and
installation issues.
Note: The 923 multi-candela appliance must be set on Code
3 horn tone to achieve synchronized temporal (code 3) tone.
Refer to installation instructions.
• Use the 923 only on circuits with continuously applied
operating voltage. Do not use the 923 on coded or
interrupted circuits in which the applied voltage is
cycled ON and OFF as the strobe may not flash.
• Failure to comply with the Installation Instructions or
General Information Sheet 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.
• Conductor size (AWG), length, and capacity should be
taken into consideration prior to design and installation
of these products, particularly in retrofit installations.
Wiring Diagrams
FROM PRECEDING APPLIANCE
+
OR FIRE ALARM CONTROL PANEL
+
+
TO NEXT APPLIANCE
OR END-OF-LINE RESISTOR
-
1. Strobes are designed to flash at 1 flash per second
minimum over their "Regulated Voltage Range". Note
the NFPA 72 (1999) specifies a flash rate of 1 or 2
flashes per second and ADA Guidelines specify a flash
rate of 1 to 3 flashes per second.
831
+ STROBE
- STROBE
+ OUT
- OUT
FACP
923
923
803
+ AUDIBLE
EOLR
Audible
NAC
circuit
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
(NAC), Occupational Safety and Health Administration
(OSHA), local, state, county, province, district, federal, and
other applicable building fire standards, guidelines, laws and
codes including, but not limited to, all appendices and
amendments and the requirements of the local authority
having jurisdiction (AHJ).
General Notes:
SIGNAL
Appliance Non-synchronized
Strobe
NAC
circuit
For detail using the DMP 831 or 832 Sync Modules, refer to
Series 831/832 data sheet or installation instructions.
- AUDIBLE
2. All candela ratings represent minimum effective Strobe
intensity based on UL 1971.
3. The 923 Multi-Candela Horn Strobe is listed under UL
1971 for indoor use with a temperature range of 32° F
to 120° F (0° C to 49° C) and maximum humidity of
85%.
923 appliances synchronized with 831 module single Class B NAC
circuit with audible silence feature
923 Multi-Candela Product Specification
Digital Monitoring Products
www.dmpnet.com
2500 N. Partnership Boulevard Springfield, MO 65803
Specifications
Model 923-MCW Average Current
Hi dBA setting (95dBA)
Voltage
15cd
30cd
75cd
(VDC)
16.0
.080
.128
.226
24.0
.072
.094
.153
33.0
.068
.092
.148
Low dBA setting (90 dBA)
16.0
.078
.123
.219
24.0
.058
.082
.140
33.0
.052
.075
.128
110cd
.304
.183
.166
.287
.174
.161
dBA Ratings for Series 923
Description
Continuous
Horn
CODE 3
Horn
Volume
High
Low
High
Low
Reverberant
dBA @ 10 ft per
UL 464
Anechoic dBA
@ 10 ft
24 VDC
24 VDC
87
81
82
76
95
90
95
90
Average current per actual production testing at listed VDC. For
rated average and peak current across the UL listed voltage
range for both filtered DC and unfiltered VRMS, see the
installation instructions.
Mounting Options
DMP Model 841, Trim plate - Option H
DMP Model 842, SHBB surface backbox - Option X
DMP Model 846, BB backbox - Option J
Single gang, flush - Option B
4" square, flush - Option D
4" square, deep, flush - Option E
Double gang, flush - Option F
Double gang, surface - Option G
RP-R retrofit plate - Option O
SFP semi-flush plate - Option R
AP adapter plate - Option S
Refer to LT-0459 Fire Notification Mounting Accessories
Architects and Engineers Specifications
The notification appliance(s) shall be DMP Model 923 MultiCandela Horn Strobes and Model 803 Horn appliances; and
companion Model 831 and 832 Sync Module(s), or approved
equals. Appliances shall be listed under UL Standard 1971
(Emergency Devices for the Hearing Impaired for Indoor Fire
Protection Service). Model 803 Audible Horn, Model 831 and
832 Sync Modules shall be listed under Standard 464 (Fire
Protective Signaling) and FCC Part 15, Class B.
The appliances shall be designed for 2-wire operation and shall
provide either a continuous horn/tone or temporal (Code 3) tone
when constantly applied voltage from a Notification Appliance
Circuit (NAC) of the Fire Alarm Control Panel (FACP) or
synchronized temporal (Code 3) horn and synchronized strobe
when used in conjunction with the 831 or 832 Sync Module(s).
The 923 series shall be designed so that the horn tone may
be silenced while maintaining strobe activation (when
used with the 831 or 832 Sync Modules). The 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 (NAC) circuit
and one for the audible (NAC) circuit. 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 horn tone shall be silenced while
maintaining strobe activation.
The Sync Module shall be designed and available in two
versions; the 831 for control of a single Class B NAC
circuit; and a dual output version, the 832 for control of
either a single Class A or two Class B NAC circuits. The
832 dual circuit version shall provide the additional capability
of “daisy-chaining”, that is, the ability to interconnect
multiple 832’s for synchronous horn and strobe operation
on multiple NAC circuits. Coverage interconnection
capability shall be for a maximum of 20 modules (40 Class
“B” NAC circuits). Rated average current requirement for
the 831 shall be .014 Amps @12 VDC and .025 Amps @24
VDC; the 832 shall be .020 Amps @12 VDC and .038
Amps @ 24 VDC. The 831 Sync Module shall be capable
of handling a 3 Amp load at 12 or 24 VDC. The 832 Sync
Module shall be capable of handling a load of 3 Amps per
circuit in the Class B mode and 3 Amps per module in the
Class A mode at 12 or 24 VDC.
The 831 or 832 Sync Modules and the 923 Multi-Candela
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). In
this default mode, the strobes shall revert to a nonsynchronized default flash rate.
The 923 and 803 appliances shall be designed for operation
over their respective listed voltage ranges of 10-15.6
VDC; and 16.0 to 33.0 VDC. The units shall be designed
for operation on filtered DC, or unfiltered VRMS. Rated
average current for the 923 shall depend upon voltage and
strobe intensity; the current shall be as low as .085
Amperes for 24 VDC version (with voltage set at high dB
output). Rated average current for Model 803 (volume set
at high dB output) shall be .014 Amps for 12 VDC.
All models shall be polarized for DC supervision and shall
incorporate screw terminals for in/out field wiring of #18 to
#12 AWG wire size.
If required, a Model 841 (Notification Appliance Trim
Plate) shall be provided.
Dimensions for the 923 and 803 shall be 4.75 inches
square by 1.22 inches deep.
923 Multi-Candela Product Specification
2500 N. Partnership Boulevard Springfield, MO 65803
www.dmpnet.com
Digital Monitoring Products
Digital Monitoring Products
2500 N. Partnership Boulevard Springfield, MO 65803 800-641-4282