wheelock ET70-241575, ET70-24MCW, ET70-24MCWH, ET70, ET90-24MCC Service Manual

SERIES ET70

THE CITY OF
NEW YORK

DEPARTMENT OF BUILDINGS

U

L

®

Series ET Speakers and Speaker Strobes

SERIES ET90

Description

The Wheelock high performance Series ET Speakers and Series
ET Speaker Strobes provide high audio output, clear audibility, dual
voltage (25/70 VRMS) capability and field selectable taps from 1/8
to 8 watts. They are designed to meet the critical needs of the life
safety industry for effective emergency voice communications, tone
signaling and visible signaling to alert the hearing impaired.

The low profile design incorporates a speaker mounting plate
for faster and easier installation. Each model has a built-in level
adjustment feature and an aesthetic two (2) screw grille cover.

The Series ET Speaker Strobe models incorporate Low Current
draw Series RSS Strobes.

Strobe options for wall mount models include 1575 cd or Wheelock’s
patented MCW multi-candela strobe with field selectable candela
settings of 15/30/75/110cd or the high intensity MCWH strobe with
field selectable 135/185cd.

Ceiling mount models are available in Wheelock’s patented
MCC multi-candela ceiling strobe with field selectable intensities
of 15/30/75/95cd or the high intensity MCCH strobe with field
selectable 115/177cd.

The strobe portion of all Series ET Strobes may be synchronized
when used in conjunction with the Wheelock SM, DSM sync
modules or the Wheelock PS-24-8MC Power Supplies with
patented Sync Protocol. Wheelock synchronized strobes offer
an easy way to comply with ADA recommendations concerning
photosensitive epilepsy.

Series ET70 and ET90 Speaker Strobes are UL Listed for indoor
use under Standard 1971 (Signaling Devices for the Hearing
Impaired) and Standard 1480 (Speaker Appliances), and use a
Xenon flashtube with solid state circuitry enclosed in a rugged
Lexan® lens to provide maximum reliability for

effective visual signaling. All inputs are supervised and employ
IN/OUT wiring terminals for fast installation using #12 to #18 AWG
wiring.

Color options for Series ET speakers and speaker strobes are red,
white, or nickel plated.

Features

• Approvals include: UL Standard 1971, UL Standard 1480,
New York City (MEA), California State Fire Marshall (CSFM),
Factory Mutual (FM), and Chicago (BFP) See approvals by
model in Specifications and Ordering Information

• ADA/NFPA/UFC/ANSI compliant

• Meets OSHA 29 Part 1910.165

• Wall mount models are available with Field Selectable Candela
Settings of 15/30/75/110cd or 135/185cd (Multi-Candela
models) or 1575cd (Single Candela model)

• Ceiling mount models are available with field selectable
candela settings of 15/30/75/95cd or 115/177cd (multi-candela
models)

• Strobes produce 1 flash per second over the regulated voltage
range

• 24 VDC with wide UL “Regulated Voltage” using filtered DC
or unfiltered VRMS input voltage

• Synchronize with sync modules or power supplies with built-in
sync protocol

• Field selectable taps for 25 or 70 VRMS operation from 1/8
watt to 8 watts

• High efficiency design for maximum output at minimum
wattage across a frequency range of 400 to 4000 HZ

• Fast installation with IN/OUT screw terminals using #12 to
#18 AWG wires

S5391
S2652

151-92-E

7125-0785:152 (ET70/90 MC)
7125-0785:146 (ET70WP)

NOTE: All CAUTIONS and WARNINGS are identified by the symbol . All warnings are printed in bold capital letters.

WARNING: PLEASE READ THESE SPECIFICATIONS AND ASSOCIATED INSTALLATION INSTRUCTIONS CAREFULLY BEFORE USING, SPECIFYING OR

APPLYING THIS PRODUCT. VISIT WWW.COOPERWHEELOCK.COM OR CONTACT COOPER WHEELOCK FOR THE CURRENT INSTALLATION INSTRUCTIONS.
FAILURE TO COMPLY WITH ANY OF THESE INSTRUCTIONS, CAUTIONS OR 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”. Note that NFPA-72 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 Standard 1971.

• Series NS Strobe products are listed under UL Standard 1971 for indoor use with a temperature range of 32°F to 120°F (0°C to 49°C) and
maximum humidity of 93% (± 2%).

• Series NH horns are listed under UL Standard 464 for audible signal appliances (Indoor use only).

• “Regulated Voltage Range” is the newest terminology used by UL to identify the voltage range. Prior to this change UL used the

terminology “Listed Voltage Range”.

Table 1: UL Max Current*

ET70/ET90

Speaker

241575W 24MCW 24MCWH 24MCC 24MCCH

ET70 Strobe current - Wall Mount ET90 Strobe current - Ceiling Mount

Strobes

1575cd 15cd 30cd 75cd 110cd 135cd 185cd 15cd 30cd 75cd 95cd 115cd 177cd

16-33 VDC 0.090 0.060 0.092 0.165 0.220 0.300 0.420 0.065 0.105 0.189 0.249 0.300 0.420

Table 2: ET70/ET90 UL Reverberant dBA @ 10 Feet**

watts 1/8 1/4 1/2 1 2 4 8

ET Speaker 75.0 78.0 81.0 84.0 87.0 90.0 93.0

ET Speaker Strobe 75.0 78.0 81.0 84.0 87.0 90.0 93.0

**dBA ratings are based on UL testing under UL Standard 1480

*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.