Wheelock DSM Installation Manual
273 Branchport Avenue
Long Branch, N.J. 07740
(800) 631-2148 (USA) Thank you for using our products.
(800) 397-5777 (CANADA)
www.wheelockinc.com
SERIES DSM AND DSMX SYNCHRONIZATION (SYNC) MODULE
GENERAL:
Use this product according to this instruction manual. Please keep this instruction manual for future reference.
INSTALLATION INSTRUCTIONS
Wheelock’s Dual Sync Modules (Series DSM) are uniquely designed to accept two independent strobe and audible inputs and convert
them to a single output that connects to our Series AS and NS appliances. When interfaced with the DSM, the AS and NS produce
the synchronized code 3 horn and synchronized strobe upon actuation. The audible portion of the AS and NS can be controlled
independently from the strobe using only a 2-wire alarm circuit. They are the ideal choice for alarm systems where an audible
silencing feature is required during an alarm condition. The DSM is designed for use with Class A or Class B wiring and they are
capable of synchronizing multiple alarm circuits if required. They can be used with 12VDC or 24VDC systems. The DSM is UL
Listed under Standard 1971 (Emergency Appliances for the Hearing Impaired) for indoor use, Fire Protective Service and ULC Listed
under CAN/ULC-S525-99 for Audible Signaling Appliances for Fire Alarm Systems. All inputs are polarized for compatibility with
standard reverse polarity supervision of circuit wiring by a Fire Alarm Control Panel (FACP).
Table 1: Products Available for Use with DSM Sync Module
Series AH/AH-WP, NH, HS Audible Horn
Series MT with Strobe Multitone Horn with Sync Strobes
Series E70/90 with Strobe E Speakers with Sync Strobe
Series ET70/90/1080/1081 with Strobe ET Speakers with Sync Strobe
Series RSS/RSSP Strobes Remote Sync Strobes
Series CH70 Strobes Chimes with Sync Strobes
Series AS, NS, HS4 Audible Horn with Sync Strobes
NOTE: All CAUTIONS and WARNINGS are identified by the symbol . All warnings are printed in bold capital letters.
WARNING: THE DSM APPLIANCE IS A "FIRE ALARM DEVICE - DO NOT PAINT."
NOTE: All Canadian Installations should be in accordance with the Canadian Standard for the Installation of Fire Alarm Systems -
CAN/ULC-S524-01 and Canadian Electrical Code, Part 1. Final acceptance is subject to Authorities Having Jurisdiction.
WARNING: PLEASE READ THESE INSTRUCTIONS CAREFULLY. FAILURE TO COMPLY WITH ANY OF THE
FOLLOWING 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.
SPECIFICATIONS:
Table 2: Ratings Per UL and ULC
Model
Regulated
Voltage
(VDC/VRMS)
Voltage Range Limit
Per UL 1971
(VDC/VRMS)
Voltage Range Per
CAN/ULC-S525-99
(VDC/VRMS)
Mounting
Option
DSM-12/24 12/24 8.0-33.0 10.5-31.0 A
DSMX-12/24 * 12/24 8.0-33.0 10.5-31.0 ----
* DSMX is a UL recognized component, DSMX is a ULC model.
WARNING: FOR UL APPLICATIONS THESE APPLIANCES WERE TESTED TO THE OPERATING VOLTAGE LIMITS OF 8.0-
33.0 VOLTS USING FILTERED (DC) OR UNFILTERED FULL-WAVE RECTIFIED (FWR). DO NOT APPLY 80% AND 110% OF
THESE VOLTAGE VALUES FOR SYSTEM OPERATION.
WARNING: FOR ULC APPLICATIONS THESE APPLIANCES WERE TESTED TO THE OPERATING VOLTAGE OF 10.5-31.0
VOLTS USING FILTERED (DC) OR UNFILTERED FULL-WAVE-RECTIFIED (FWR). APPLY 80% AND 110% OF THESE
VOLTAGE VALUES FOR SYSTEM OPERATIONS.
* DSMX does not have a mounting plate.
Copyright 2004 Wheelock, Inc. All rights reserved.
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Sheet 1 of 8
WARNING: CHECK THE MINIMUM AND MAXIMUM OUTPUT OF THE POWER SUPPLY AND STANDBY
BATTERY AND SUBTRACT THE VOLTAGE DROP FROM THE CIRCUIT WIRING RESISTANCE TO
DETERMINE THE APPLIED VOLTAGE TO THE STROBES.
Table 3: UL Current Ratings (AMPS)
Maximum RMS
UL Voltage
Current
In1/In2 Audible
DC 8-33VDC 0.045 0.010
FWR 8-33VRMS 0.062 0.012
* See Figures 1A and 1B for the time duration of the peak and inrush current.
Table 3A: ULC Current Ratings (AMPS)
ULC Rated Average Rated Peak * Rated Inrush *
Voltage Current Current Current
In1/In2 Audible In1/In2 Audible In1/In2 Audible
10.5VDC 0.019 0.004 0.055 0.004 0.150 0.016
12.0VDC 0.020 0.004 0.064 0.004 0.170 0.019
24.0VDC 0.035 0.008 0.080 0.008 0.342 0.030
31.0VDC 0.045 0.010 0.090 0.010 0.470 0.040
10.5VRMS 0.028 0.005 0.107 0.008 0.210 0.016
12.0VRMS 0.030 0.006 0.103 0.009 0.240 0.019
24.0VRMS 0.048 0.010 0.145 0.015 0.480 0.033
31.0VRMS 0.062 0.012 0.175 0.022 0.685 0.056
WARNING: MAKE SURE THAT THE TOTAL RMS CURRENT, TOTAL AVERAGE CURRENT AND TOTAL
PEAK CURRENT REQUIRED BY ALL APPLIANCES THAT ARE CONNECTED TO THE SYSTEM’S PRIMARY AND
SECONDARY POWER SOURCES, NAC CIRCUITS, SM, DSM SYNC MODULES OR WHEELOCKS POWER
SUPPLIES DO NOT EXCEED THE POWER SOURCES’ RATED CAPACITY OR THE CURRENT RATINGS OF ANY
FUSES ON THE CIRCUITS TO WHICH THESE APPLIANCES ARE WIRED. OVERLOADING POWER SOURCES
OR EXCEEDING FUSE RATINGS COULD RESULT IN LOSS OF POWER AND FAILURE TO ALERT OCCUPANTS
DURING AN EMERGENCY, WHICH COULD RESULT IN PROPERTY DAMAGE AND SERIOUS INJURY OR
DEATH TO YOU AND/OR OTHERS.
When calculating the total currents: Use Table 3 to determine the highest value of “RMS Current” for an individual strobe (across
the expected operating voltage range of the strobe), use Table 3A to determine the highest value of “Rated Average Current” or
“Rated Peak Current” of an individual strobe (across the expected voltage range of the strobe), then multiply these values by the total
number of strobes; be sure to add the currents for any other appliances, including audible signaling appliances, powered by the same
source and include any required safety factors.
If the peak current exceeds the power supplies’ peak capacity, the output voltage provided by the power supplies may drop below the
listed voltage range of the appliances connected to the supply and the voltage may not recover in some types of power supplies. For
example, an auxiliary power supply that lacks filtering at its output stage (either via lack of capacitance and/or lack of battery backup
across the output) may exhibit this characteristic.
P83177 T
Sheet 2 of 8
Figure 1A: Typical In-Rush Current Curve
AMPLITUDE (REFER TO TABLE 3 FOR ACTUAL VALUES)
Figure 1B: Typical Peak Current Curve
AMPLITUDE (REFER TO TABLE 3 FOR ACTUAL VALUES)
20
40
TIME (milliseconds)
60
20
40
TIME (milliseconds)
60
WIRING INFORMATION:
NOTE: Non-sync appliances can be installed before or after an SM or DSM. If the Non-Sync appliance requires audible silence,
four wire connection is necessary with the strobe circuit connected before the SM or DSM NAC circuit, and the audible leads
connected to a silenceable NAC circuit from the FACP.
CAUTION: Power Supply may be used in conjunction with the DSM Sync Modules ONLY in the order shown in Figure 2.
Only one DSM Sync Module shall be allowed on a signaling circuit. Do not connect the Power Supply to the signaling circuit after
the one DSM Sync Module. Exception: The Wheelock PS-12/24-8 Power Supply (UL Only) can be connected either before or after
the DSM Sync Module. Refer to Power Supply instruction manuals for proper application or installation.
Figure 2: DSM Connection Diagram with Power Supply
FIRE
ALARM
CONTROL
PANEL
(FACP)
POWER
SUPPLY
DUAL SYNC
MODULE
APPLIANCE OR
SYNC STROBE
For applications that require synchronizing multiple alarm circuits together, daisy chain DSM’s as shown in Figure 3 using the sync
terminals, then follow the wiring diagrams for specific applications. Sync screw terminals can accept two #18 AWG wires for in-out
wiring. Strip leads 3/8 inches for connection to screw terminals.
Figure 3: Multiple Alarm Circuits Synchronization (Up to 20 DSM’s)
DUAL SYNC MODULE
+
SYNC
ALARM
LOOP 1
-
DUAL SYNC MODULE
ALARM
+
SYNC
LOOP 2
-
DUAL SYNC MODULE
ALARM LOOP
+
SYNC
n=20 MAXI MUM
-
NOTE: The total length of wire connecting the DSM’s SYNC terminals should not exceed 1,000 feet of #18 American Wire Gauge
(AWG) overall between the first and last DSM. If this limit is exceeded, loss of synchronization between DSM’s may result.
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Sheet 3 of 8
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