3-ASU operating instructions
3.4 EST3 System Operation Manual
Operation the Audio Source Unit
The function of a life safety system is to alert people occupying a
facility of an emergency. The Audio Source Unit is designed to
permit rapid selection and paging to the affected areas of the
facility. For example, the page signal automatically overrides
any other signals.
Event signaling
In large facilities, the people most effected by an emergency
should be instructed to evacuate the area immediately, and
people not in immediate danger should receive an alert signal.
Since most large facilities have a significant number of transient
occupants, the most effective signaling is a combination of
attention getting tones, followed by instructional messages.
The information provided here is general in nature. Each facility
is unique. The life safety system in your facility has been
designed by fire safety professionals to meet the specific
requirements of the fire codes in your location. Please refer to
the site-specific instructions provider by the installer to
determine the exact operation of your system.
Evacuation (EVAC) Signaling
The evacuation signal notifies facility occupants that they are in
immediate danger, and must evacuate the area. Evacuation
signals can take the form of bells, horns, tones, and audio
messages. Accompanying the audio message is a visual
notification appliance, typically a flashing strobe light.
The system automatically activates all the evacuation signals in
the affected areas of the facility.
Alert Signaling (optional)
The alert signal notifies the occupants of a facility that: an
emergency event is in progress; they are not in immediate
danger; and they should prepare to evacuate, but not to evacuate
at this time. Alert signals are typically tones or audio messages.
The system automatically activates the alert signals (if
programmed in your system) in the affected areas of the facility.
Page Messages
The most reliable source of information about an emergency
event comes from the individual who is in charge of the facility
during the emergency. This individual is typically the fire chief
or facility manager. The page function permits the individual in
charge to make announcements to selected portions of the
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