wheelock MT-12-24, MT4-12-24 INSTALLATION INSTRUCTIONS
273 Branchport Avenue
Long Branch, NJ 07740 Thank you for using our products.
(800) 631-2148 (USA) INSTALLATION INSTRUCTIONS
(800) 397-5777 (CANADA) MULTITONE APPLIANCES
www.wheelockinc.com MT-12/24, MT4-12/24
Use this product according to this instruction manual. Please keep this instruction manual for future reference.
GENERAL:
Multitone Appliances are UL Listed under Standard 464 for Audible Signal Appliances and ULC Listed under Standard
CAN/ULC-S525-99 for Audible Signal Appliances for Fire Alarm Systems for Fire Protective Service and for General Signaling
Service. They are listed for both indoor and outdoor use with the backboxes specified in these instructions. See Mounting
Options A,B,C,D,E,F,G for MT models and H for MT4 models. Multitone Appliances can be field set to produce any one of
eight commonly used alarm tones. Sound output can be field set to provide either HIGH (HI) dBA or STANDARD (STD) dBA
sound output level. Multitone Appliances can be field set for either 12VDC or 24VDC operation and are designed for use with
either filtered or unfiltered Full-Wave-Rectified (FWR) input voltage. All inputs are polarized for compatibility with standard
reverse polarity supervision of circuit wiring by a Fire Alarm Panel.
NOTE: All CAUTIONS and WARNINGS are identified by the symbol . All warnings are printed in bold capital letters.
NOTE: All Canadian installations should be in accordance with the Canadian Standard for the Installation of Fire Alarm
Systems, CAN/ULC-S524-01 and the Canadian Electrical Code, Part 1. Final acceptance is subject to authorities having
jurisdiction.
WARNING: PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE USING THIS PRODUCT.
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.
WARNING: THE MT APPLIANCE IS A “FIRE ALARM DEVICE – DO NOT PAINT”.
SPECIFICATIONS:
Table 1: UL/ULC Listed Models
UL Ratings ULC Ratings
Model Regulated
Voltage
(VDC/VRMS)
Voltage
Range
(VDC/VRMS)
MT-12/24 12/24 8.0-17.5 or 16.0-33.0 76-94 10.5-15.6 or 20.0-31.0 85-100 A-G
MT4-12/24 12/24 8.0-17.5 or 16.0-33.0 76-94 10.5-15.6 or 20.0-31.0 85-100 H
Reverberant
dBA
At 10 Feet
Voltage
Range
(VDC/VRMS)
Anechoic
dBA
at 10 Feet
Mounting
Options
NOTE: All models are UL and ULC Listed for indoor and outdoor use with a temperature range of -40°C to +66°C (-40°F to
+151°F) and maximum humidity of 98% ± 2% RH
WARNING: FOR UL APPLICATIONS THESE APPLIANCES WERE TESTED AT UL TO THE OPERATING
VOLTAGE LIMITS OF 16-33VDC FOR 24VDC OPERATION AND 8-17.5VDC FOR 12VDC OPERATION USING
FILTERED (DC) OR UNFILTERED FULL-WAVE-RECTIFIED (FWR). DO NOT APPLY 80% AND 110% OF
THESE VOLTAGE VALUES FOR SYSTEM OPERATION.
WARNING: FOR UL APPLICATIONS THESE APPLIANCES WERE TESTED AT ULC TO THE OPERATING
VOLTAGE LIMITS OF 20-31VDC FOR 24VDC OPERATION AND 10.5-15.6VDC FOR 12VDC OPERATION USING
FILTERED (DC) OR UNFILTERED FULL-WAVE-RECTIFIED (FWR). APPLY 80% AND 110% OF THESE
VOLTAGE VALUES FOR SYSTEM OPERATION.
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.
Copyright 2005 Wheelock, Inc. All rights reserved.
P82467-001 L
Sheet 1 of 8
Table 2: UL Current Ratings for Multitone Audible Appliances
Maximum RMS Current
(AMPS)
Tone Tone
Description 24VDC 24VRMS 12VDC 12VRMS
HI STD HI STD HI STD HI STD
Horn Broadband Horn (Continuous) 0.108 0.044 0.087 0.045 0.177 0.034 0.172 0.034
Bell 1560 Hz Modulated (0.07 Sec. ON/Repeat) 0.053 0.024 0.051 0.028 0.095 0.020 0.095 0.023
March Time Horn Horn (0.25 Sec. ON/0.25 Sec. OFF/Repeat) 0.104 0.087 0.087 0.045 0.142 0.034 0.142 0.039
Code 3 Horn Horn (ANSI S3.41 Temporal Pattern) 0.091 0.035 0.087 0.045 0.142 0.034 0.142 0.039
Code 3 Tone 500 Hz (ANSI S3.41 Temporal Pattern) 0.075 0.035 0.056 0.029 0.105 0.021 0.105 0.023
Slow Whoop 500-1200Hz Sweep (4.0 Sec. ON/0.5 Sec. OFF/Repeat) 0.098 0.037 0.092 0.042 0.142 0.035 0.142 0.038
Siren 600-1200Hz Sweep (1.0 Sec. ON/Repeat) 0.104 0.036 0.092 0.040 0.152 0.030 0.152 0.034
HI/LO 1000/800 Hz (0.25 Sec. ON/Alternate) 0.057 0.025 0.058 0.032 0.114 0.026 0.114 0.029
Table 2A: ULC Average Current Ratings for 24VDC and 12VDC Multitone Audible Appliances
Tone
Horn
Bell
March
Time
Code 3
Horn
Code 3
Tone
Slow
Whoop
Siren
HI/LO
HI/LO
Volume
20VDC 24VDC 31VDC 10.5VDC 12VDC 15.6VDC
HI 0.036 0.040 0.050 0.090 0.100 0.125
STD 0.021 0.023 0.029 0.018 0.020 0.025
HI 0.013 0.014 0.018 0.028 0.031 0.039
STD 0.011 0.012 0.015 0.009 0.010 0.013
HI 0.036 0.040 0.050 0.090 0.100 0.125
STD 0.021 0.023 0.029 0.018 0.020 0.025
HI 0.036 0.040 0.050 0.090 0.100 0.125
STD 0.021 0.023 0.029 0.018 0.020 0.025
HI 0.025 0.028 0.035 0.054 0.060 0.075
STD 0.015 0.017 0.021 0.014 0.015 0.019
HI 0.043 0.048 0.060 0.090 0.100 0.125
STD 0.023 0.026 0.033 0.023 0.025 0.031
HI 0.032 0.036 0.045 0.074 0.082 0.103
STD 0.021 0.023 0.029 0.018 0.020 0.025
HI 0.018 0.020 0.025 0.040 0.044 0.055
STD 0.013 0.014 0.018 0.011 0.012 0.015
24VDC Models 12VDC Models
P82467-001 L
Sheet 2 of 8
WARNING: MAKE SURE THAT THE TOTAL RMS CURRENT AND TOTAL AVERAGE 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 2 to determine the highest value of “RMS Current” for an individual multitone.
Use Table 2A to determine the highest value of “Rated Average Current” for an individual multitone, then multiply these values
by the total number of multitones; be sure to add the currents for any other 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.
Table 3: dBA Ratings
dBA Reverberant Ratings Per UL 464 dBA Anechoic Ratings Per CAN/ULC S525-99
UL 24VDC UL 12VDC ULC 24VDC ULC 12VDC
16V 24V 33V 8V 12V 17.5V 20V 24V 31V 10.5V 12V 15.6V
Tone
Horn
Bell
HI/LO
Volume
HI 89 92 94 89 92 94 97 99 100 97 99 100
STD 84 87 90 84 87 90 91 93 94 91 93 94
HI 83 86 88 83 86 88 90 92 93 90 92 93
STD 76 80 83 76 80 83 85 87 88 85 87 88
HI 86 89 91 86 89 91 97 99 100 97 99 100 March
Time
STD 80 84 87 80 84 87 91 93 94 91 93 94
HI 85 88 90 85 88 90 97 99 100 97 99 100 Code 3
Horn
STD 79 83 86 79 83 86 91 93 94 92 93 94
HI 81 85 86 81 85 86 93 95 96 93 95 96 Code 3
Tone
STD 76 80 82 76 80 82 88 90 91 88 90 91
HI 87 90 92 87 90 92 97 99 100 97 99 100 Slow
Whoop
Siren
HI/LO
STD 81 85 87 81 85 87 92 94 95 92 94 95
HI 86 89 92 86 89 92 96 98 99 96 98 99
STD 81 84 87 81 84 87 91 93 94 91 93 94
HI 83 86 89 83 86 89 91 93 94 91 93 94
STD 77 81 84 77 81 84 86 88 89 86 88 89
ULC Directional Characteristics:
-3 dBA: 48 degrees left, 41 degrees right -6 dBA: 50 degrees left, 58 degrees right.
P82467-001 L
Sheet 3 of 8
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