DSC WS4926 Serie Notice D'installation Et D'utilisation

WS4926 Series Wireless Smoke Detector
Installation and Operating Instructions
Read this instruction sheet thoroughly before installation and use of the WS4926 Wireless Smoke Detector
Introduction
The WS4926 is a wireless photoelectric smoke detector with an inter-
nal piezoelectric alarm. Three versions are available: US (UL), Canadian
(ULC) and European (EU).
Piezo Sounder
Operation
Approximately every 7 to 8 seconds the unit tests for a smoke alarm
condition. During this sequence the unit also performs self diagnos-
tics, 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, ULC, EU).
The smoke detector has a preset 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 detector
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 environ-
ment is persistently close to the alarm threshold and provide more
time to investigate and either escape or correct the situation.
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 adjust-
ment, 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 control 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 automatically to its normal
operation. If smoke around the unit is dense enough to suggest a
potentially dangerous situation, it will stay in alarm.
LED/Test/Silence/Reset Button
Alignment Marks
Tamper
The removal of the detector from the mounting plate initiates a 'tam-
per' 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 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 - (smoke alarm). Transmitted at time of
occurrence.
• Tamper / Tamper Restore - (tamper switch activated) 10 second
maximum delay on restore before transmission.
• Low Battery - (battery voltage falls below threshold). Battery volt-
age 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 WS4926 is powered by two, 3V
tions section).
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 bat-
tery 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 WS4926 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 per-
sons).
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 NFPA 72 Chapter 11, CAN/
ULC-S553-02 or other appropriate national standards for installa-
tion recommendations.
• Do NOT locate smoke detectors at the top of peaked or gabled ceil-
ings; 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.
• Do NOT locate detectors in areas of high humidity.
• Do NOT 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."
lithium batteries (see Specifica-
DC