Operation
February 2011 4-20 P/N 06-237041-001
The Signal Silenced LED will illuminate when the <SIGNAL SILENCE> Key is pressed after all pre-
alarm events have been acknowledged. A subsequent press of the <SIGNAL SILENCE> Key will re-
activate any outputs that were silenced if no new pre-alarm events were reported. The Signal Silenced
LED will also go out. This toggling capability will remain in effect until the control unit is reset.
A silence command that caused all silenceable outputs to de-activate will be overridden by a
subsequent pre-alarm report. All silenced outputs associated with the subsequent pre-alarm
initiating device will reactivate, and the Signal Silenced LED will go out. The <SIGNAL SILENCE>
Key must be pressed again to de-activate any active, silenceable outputs.
4-10.5.3 HOW TO RESET THE CONTROL UNIT AFTER A PRE-ALARM CONDITION
The FenwalNET 8000-ML control unit resumes normal operations when it receives "Pre-Alarm Off"
messages from all previously-alarmed automatic initiating devices. This mode of operation ensues
regardless of whether the automatic alarm-initiating devices are configured for latching or non-
latching operation.
4-10.6 Concurrent States
It is possible for the FenwalNET 8000-ML system to be in more than one of the event-driven, Off-
Normal Mode states concurrently. In general, any new event, regardless of its type, is prioritized for
immediate display, and the control unit's application program runs to activate the outputs, if any,
associated with the new event. The FenwalNET 8000-ML's hierarchy for displaying events will
determine whether the details associated with the new event will continue to be displayed after
acknowledgment or whether its display will be suppressed due to the presence of other higher-
priority events.
The general hierarchy for the display of events is as follows:
•Alarm
• Pre-Alarm
• Supervisory and Trouble
4-10.6.1 ALARM EVENTS
An alarm event is a signal indicating an emergency situation that requires an immediate response.
However, there are varying degrees of alarm signals, depending on whether the system’s primary
objective is property protection and mission continuity or whether it is occupant notification and
building evacuation.
4-10.6.1.1 Property Protection/Mission Continuity Alarm Events
A property-protection/mission continuity system is usually installed to suppress a fire in the area that
it is protecting. Waterless fire-suppression systems typically progress through multiple, sequential
alarm states before the extinguishing system is discharged. The automatic detection system is either
crossed-zoned or arranged in a counting zone to ensure that a flaming fire is present at the time of
extinguishing-system discharge and for added reliability.
The typical alarm stages of a FenwalNET 8000-ML System designed for property protection/mission
continuity are summarized in Table 4-5.
Note: There must be at least two detectors in the protected area when either crossed-zoned or
counting-zone automatic detection is used.
To Next Page
Loading...
Need help?
General