SILENT KNIGHT 4821 Manual de instalación Pagina 70

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Model 4821/4820 Control/Communicator Installation Manual
4-26 150964
4.16 Smoke Detector Wiring and Operation
Note: The Model 4821/4820 is not compatible with 2-wire smoke detectors.
4.16.1 Smoke Detector Compatibility
This section describes the 4821/4820 reset and smoke verification cycles. Any smoke detec-
tors attached to the 4821/4820 must be compatible with the reset cycle. If you are using the
smoke verification feature, smoke detectors must also be compatible with the smoke verifica-
tion cycle. See Section 4.16.1.1 for information about reset operation. See Section 6.3.2.3 for
information about programming the smoke verification option.
4.16.1.1 Smoke Reset Cycle
When you reset a smoke detector, power is off for 6 seconds. The system then applies a restart
time of 36 seconds. During the restart time, smoke power is reapplied and the zones are
allowed to stabilize. The system will not respond to fire zones during the reset period (but will
respond to other types of zones, including fire contact zones).
4.16.1.2 Smoke Verification Cycle
Smoke verification is a four-period cycle:
Retard Period 18 second delay after a zone is tripped before smoke detector power
turns off.
Reset Period Smoke detector power is off for 6 seconds.
Restart Period 36 seconds for the smoke detectors to stabilize. The system will not
respond to fire zones during this time (but will respond to other
types of zones, including fire contact zones).
Confirmation Period 60 second period during which all zones will be considered instant.
If the zone trips a second time during this period, the zone will go
into alarm immediately.
Smoke verification will not occur if any fire zones are currently in alarm anywhere in the
same partition.
Note: Smoke verification is not compatible with the 10 second zone response (debounce) speed. See Section
6.3.2.3 for more information.
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