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 heat detector and an internal piezoelectric
alarm. Three version are available: US version (UL), Canadian ver-
sion (ULC) and an International version (EU).
Operation
Approximately every 7 to 8 seconds the unit tests for a smoke or
heat alarm condition. During this sequence the unit also per-
forms 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) or continuous beeps
(ULC).
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 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 environ-
mentally induced changes to maintain a constant smoke sensitiv-
ity. When the drift compensation has reached its high or low limit
of adjustment, the detector will go into the trouble state.
Heat Alarm
The heat detector will go into alarm when the heat signal level
exceeds the heat alarm threshold (135ºF/57ºC); and will auto-
matically restore when the heat signal level falls below the heat
alarm threshold (restore). During an alarm the LED will flash 1/
second and the sounder will sound the evacuation temporal pat-
tern (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.
• Ta m per / Ta m p e r R e s t o re - (tamper switch activated) 10 sec-
ond maximum delay on restore before transmission.
• Low Battery - (battery voltage falls below threshold). The bat-
teries are 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, 3V
DC
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 and at that 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 horn 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 horn will 'chirp' once the test or
alarm is restored and remain 'chirping' until battery failure.
Installation Instructions
Installation
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 installation recommendations.
LED/Test Button
Piezo Sounder
Alignment Marks
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