wheelock MT-121575, MT4-115, MT4-115-WH, MT-241575, MT-24MCW Service Manual
Series MT and MT Strobe Multitone Electronic Appliances
THE CITY OF
NEW YORK
DEPARTMENT OF BUILDINGS
U
L
®
SERIES MT STROBE
Description:
The Wheelock Series MT and MT Strobe Multitone electronic
appliances offer a choice of eight (8) nationally and internationally
recognized alerting sounds: Horn, Bell, March Time Horn, Code3 Tone, Code-3 Horn, Slow Whoop, Siren or Hi/Lo Tone. The
Code-3 Horn and tone patterns are engineered to comply with
NFPA/ANSI Temporal Pattern specifications without requiring
additional equipment. With MT and MT Strobe appliances, one
alarm appliance meets most of your signaling needs. The MT
strobes can be synchronized using the Wheelock SM, DSM Sync
Modules or the PS-24-8MC Power Supply with the Wheelock
patented Sync Protocol.
The MT Strobes are designed for ADA applications while meeting
or exceeding the latest requirements of NFPA 72, ANSI 117.1,
UFC and UL Standard 1971 as well as meeting ADA requirements
concerning photosensitive epilepsy.
Each MT and MT Strobe appliance has two installer selective
sound output levels: STANDARD dBA and HIGH dBA. Non-strobe
versions provide selectable voltage capability in one unit, 12VDC
or 24VDC. Strobe versions are specific for either 12VDC or 24VDC
and all models may be used with filtered or unfiltered (full-waverectified) input voltages. Separate input terminals are available,
shunt wires are provided to enable both tone and strobe to operate
simultaneously from a single input.
The Series MT Multitone Strobe appliances are UL Listed for
indoor wall mount applications under Standard 1971 for Signaling
Devices for the Hearing Impaired and under Standard 464 for
Audible Signaling Appliances.
MT4-115-WH
SERIES MT-12/24
Features:
• Approvals include: UL Standard 1971, UL Standard
464, California State Fire Marshal (CSFM), New York City
(MEA), Factory Mutual (FM) and Chicago (BFP) See
approvals by model in Specifications and Ordering
Information
• Designed to meet or exceed ADA/NFPA/UFC/ANSI
Standards and Accessibility Guidelines
• Complies with OSHA 29, Part 1910.165
• Series MT appliances have IN and OUT wiring
terminations that accept two #12 to #18 American
Wire Gauge (AWG) wires at each terminal. Inputs are
polarized for compatibility with standard reverse polarity
type supervision
• One alarm appliance with (8) eight selective signals to
provide superior sound penetration for various ambient
and wall conditions with two field selectable sound output
levels
• Code-3 Horn and Tone meet ANSI/NFPA temporal pattern
for standard emergency evacuation signaling
• Audible and strobe can operate from a single NAC circuit
or from separate NAC circuits with any of the (8) eight
audible sounds
• MT Strobe models are available with Wheelock patented
MCW Multi-Candela strobes with field selectable c
andela settings at 15/30/75/110cd or with single candela
1575cd strobes. The strobes can be synchronized using
Wheelock sync modules or power supplies with built in
Sync Protocol
• Selectable input voltage on non-strobe versions. Strobe
versions are factory set for either 12 or 24VDC, with wide-
Listed voltage range, filtered (DC) and FWR
• No additional trimplate required for flush mounting
E5946
151-92-E
7135-0785:118 (MT4)
7125-0785:155 (MT)
7125-0758:156 (MTWP)
For Weatherproof MTWP See Data Sheet S9004
NOTE: All CAUTIONS and WARNINGS are identified by the symbol . All warnings are printed in bold capital letters .
WARNING: PLEASE READ THESE SPECIFICATIONS AND 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 over their “Regulated Voltage Range” (16-33v for 24VDC units and
8-17.5v for 12VDC units). Regulated Voltage Range is the newest terminology used by UL to identify the listed voltage range.
• All candela ratings represent minimum effective Multitone Strobe intensity based on UL Standard 1971.
• MT Strobe models are UL Standard 1971 Listed for indoor use with a temperature range of 32°F to 120°F (0°C to 49°C) and
maximum humidity of 93% ±2%. The MT-12/24, MTWP and MT4 models and listed for outdoor use at -31°F to 150°F (-35°C to
66°C) and maximum humidity of 95% (See Data Sheet S9004 or Installation Instruction Sheet P84150 for more detail on MTWP).
MTWP and MT4 strobes are listed under UL 1638.
• MT Audible is UL Standard 464 Listed.
Alarm Tones
TONE ALARM TONES PATTERN DESCRIPTION
HORN BROADBAND HORN (Continuous)
BELL 1560 Hz MODULATED (0.07 sec. ON/Repeat)
MARCH TIME
HORN
CODE-3 HORN HORN (ANSI S3.41 Temporal Pattern)
CODE-3 TONE 500 Hz (ANSI S3.41 Temporal Pattern)
SLOW WHOOP 500-1200 Hz SWEEP (4.0 sec. ON/0.5 sec. OFF/Repeat)
SIREN 600-1200 Hz SWEEP (1.0 sec. ON/Repeat)
HI/LO 1000/800 Hz (0.25 sec. ON/Alternate)
HORN (0.25 sec. ON/0.25 sec. OFF/Repeat
Table 1: dBA and Current Ratings for Multitone Audible Portion
RMS Current (amps) dBA @ 10ft (UL Reverberant)
24 VDC 12 VDC 120 VAC 24 VDC 12 VDC 120 VAC
HI
UL
max*
STD
Output
UL
max*
HI
Output
STD
Output
HI
Output
STD
Output
HI
Output
STD
Output
HI Output STD Output HI Output STD Output
@ 24
Horn 0.074 0.108 0.033 0.044 0.145 0.176 0.023 0.034 0.050 0.042 92 87 90 77 85 82
Bell 0.040 0.053 0.018 0.024 0.077 0.095 0.014 0.020 0.041 0.039 86 80 85 69 82 75
March Time
Horn
Code-3 Horn 0.069 0.091 0.026 0.035 0.100 0.142 0.023 0.034 0.050 0.042 88 83 88 73 82 75
Code-3 Tone 0.061 0.075 0.026 0.035 0.088 0.105 0.015 0.021 0.042 0.040 85 80 84 70 79 75
Slow Whoop 0.069 0.098 0.028 0.037 0.100 0.142 0.025 0.035 0.050 0.042 90 89 89 75 85 82
Siren 0.080 0.104 0.027 0.036 0.122 0.152 0.021 0.030 0.045 0.041 89 84 89 75 85 82
HI/LO 0.044 0.057 0.020 0.026 0.089 0.114 0.018 0.026 0.042 0.039 86 81 86 71 82 79
0.067 0.104 0.033 0.038 0.109 0.142 0.023 0.034 0.050 0.040 89 84 89 74 85 79
VDC
UL
max*
@ 24
VDC
UL
max*
@ 24
VDC
UL
max*
@ 24
VDC
Output
UL
max*
Table 2: Strobe Current Ratings
RMS Current (amps)
Model MT-121575 MT-241575 MTWP-2475 MT-24MCW
Candela 1575cd 1575cd 180cd 15cd 30cd 75cd 110cd
@ 24VDC 0.152 0.060 0.094 0.041 0.063 0.109 0.140
UL max* 0.255 0.090 0.138 0.060 0.092 0.165 0.220
Note: If the strobe and audible operate on the
same circuit, add the strobe current from Table 2
to the audible current from Table 1.
* RMS current ratings are per UL average RMS
method. UL max current rating is the maximum RMS
current within the listed voltage range (16-33v for 24v
units). For strobes the UL max current is usually at
the minimum listed voltage (16v for 24v units). For
audibles the max current is usually at the maximum
listed voltage (33v for 24v units). For unfiltered FWR
ratings, see installation instructions.
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