WS4916 Series Wireless Smoke Detector
Installation and Operating Instructions
Read this instruction sheet thoroughly before installation and use of the WS4916 Wireless Smoke Detector
Introduction
The WS4916 is a wireless photoelectric smoke detector with a fixed
temperature and rate of rise heat detector, and an internal piezo-
electric alarm. Four versions are available: US version (UL), Canadian
version (ULC), International version (EU), and Australian version
(AUS).
NOTE: Heat detection based on rate of rise has not been investi-
gated by UL/ULC.
NOTE: Australian version does not include the heat detector.
Operation
Approximately every 7 to 8 seconds the unit tests for a smoke or
heat alarm condition. During this sequence the unit also performs
self diagnostics, and checks for tampers and faults. During normal
operation the LED will flash every 50 seconds and the sounder will
not sound.
Smoke Alarm
The smoke detector will go into alarm when the signal level exceeds
the “alarm” threshold and automatically restore when the signal
level falls below the alarm “restore” threshold. During an alarm the
LED will flash 1/second and the sounder will sound the evacuation
temporal pattern (UL, EU, ULC).
The smoke detector has a pr eset warning threshold at 75% of the
alarm threshold. If the signal level stays above this threshold, but
below the alarm threshold, for more than 120 seconds, the detec-
tor will go into the “warning” state. If the signal level falls below
the early warning “restore” threshold, the detector will restore to its
normal state automatically. If the signal level rises above the alarm
threshold, the detector will go into alarm. The LED will flash and the
sounder will chirp every 50 seconds when in the warning state.
NOTE: This feature is intended to provide a warning if the envi-
ronment is persistently close to the alarm threshold and provide
more time to investigate and either escape or correct the situa-
tion.
Smoke - Drift Compensation
The detector automatically compensates for long-term environmen-
tally induced changes to maintain a constant smoke sensitivity.
When the drift compensation has reached its high or low limit of
adjustment, the detector will go into the trouble state.
Alarm Silencing (ULC models only)
This smoke alarm is provided with an alarm silencing feature. When
the sensor is in alarm, by pressing the Test/Silence/Reset button it
will silence the local annunciation of the alarm and transmit an
alarm restoral event to the contr ol panel. The LED will flash every 8
seconds (for up to 8 minutes) to indicate the alarm has been
silenced. The flashing LED will stop when the unit returns to normal
operation. The alarm silence feature has a fixed time setting that
desensitizes the smoke alarm for 8 minutes. Alarm silencing does
not disable the smoke alarm but rather reduces its smoke sensitivity.
Following the silenced period the smoke alarm restores automati-
cally to its normal operation. If smoke around the unit is dense
enough to suggest a potentially dangerous situation, it will stay in
alarm.
Heat Alarm
The heat detector will go into alarm when the heat signal level
exceeds the heat alarm thr eshold (135ºF/57ºC); and will automati-
cally restore when the heat signal level falls below the heat alarm
threshold (restore). The detector will also go into heat alarm if there
is a rapid increase in the temperature over a short period of time.
During an alarm the LED will flash 1/second and the sounder will
sound the evacuation temporal pattern (UL, EU) or continuous
beeps (ULC).
Tamper
The removal of the detector from the mounting plate initiates a
“tamper” transmission. The tamper condition is restored after the
detector is mounted on the plate.
Wireless Transmissions
A supervisory message is transmitted at 64 minute intervals (12
minutes in EU model) to the control panel. If the signal is not
received the control panel determines that the detector is missing.
The detector transmits the following:
• Alarm / Alarm Restore - (heat or smoke alarm). Transmitted at
time of occurrence.
• Tamper / T amper Restore - (tamper switch activated) 10 second
maximum delay on restore before transmission.
• Low Battery - (battery voltage falls below threshold). Battery
voltage is tested & transmitted at the time of a supervisory or
other transmissions.
• Trouble - (detector fault or sensor compensation limit reached).
Troubles are transmitted at the time of occurrence (one trouble
per supervisory interval).
Batteries
The WS4916 is powered by two, 3VDC lithium batteries.
Do NOT use batteries other than those listed.
The low battery threshold is set so the batteries will provide not less
than 14 days of operation, at which point the detector will send a
“low battery” signal. If the battery is still low 7 days after falling
through the low battery threshold, the sounder will “chirp” once
every 48 seconds until battery failure. During the first 7 days after
low battery detection, (non-chirp period), if the detector is tested or
goes into alarm, the sounder will “chirp” once the test or alarm is
restored and remain “chirping” until battery failure.
Replacement batteries can be purchased from the distributor, the
installation company, hardware stores or supermarkets etc.
Installation Instructions
The WS4916 Series wireless smoke detector shall be installed and
used within an environment that provides the pollution degree max
2 and over voltages category II in NON HAZARDOUS LOCATIONS,
indoor only. The equipment is designed to be installed by SERVICE
PERSONS only; (SERVICE PERSON is defined as a person having the
appropriate technical training and experience necessary to be aware
of hazards to which that person may be exposed in performing a
task and of measures to minimize the risks to that person or other
persons.)
1. Smoke Detector Placement
On smooth ceilings, detectors may be spaced 9.1m (30 feet) apart
as a guide. Other spacing may be required depending on ceiling
height, air movement, the presence of joists, uninsulated ceilings,
etc. Consult National Fire Alarm Code NFP A 72 Chapter 11, CAN/
ULC-S553-02 or other appropriate national standards for installa-
tion recommendations.
•DoNOT locate smoke detectors at the top of peaked or gabled
ceilings; the dead air space in these locations may prevent the unit
from detecting smoke. Avoid areas with turbulent air flow, such
as near doors, fans or windows. Rapid air movement around the
detector may prevent smoke from entering the unit.
•DoNOT locate detectors in areas of high humidity.
•DoNOT locate detectors in areas where the temperature rises
above 38ºC (100ºF) or falls below 5ºC (41ºF).
Install Smoke detectors in accordance with NFPA 72, Chapter 11.
“Smoke detectors shall be installed outside of each sleeping area in
the immediate vicinity of the bedrooms and on each additional
story of the family living unit, including basements and excluding
crawl spaces and unfinished attics. In new construction, a smoke
detector also shall be installed in each sleeping room.”
LED/Test/Silence/Reset Button
Piezo Sounder
Alignment Marks
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