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8.4 Two Stage Operation
In a two stage system, alarm inputs are either first stage (alert) inputs or second stage
(general alarm) inputs. First stage inputs include inputs from the following types of circuits:
non-verified alarm, verified alarm, sprinkler alarm, and water-flow alarm. Second stage inputs
include alarms on the general alarm circuits, activation of the General Alarm button, or
expiration of the Auto General Alarm timer. Any of these alarm inputs occurring when the
panel is not already in alarm cause the following:
• The buzzer sounds steadily
• If fire drill is active, it is cancelled
• The Common Alarm LED turns on
• The Common Alarm relay activates if Aux disconnect is not active
• The Auto Signal Silence timer, if configured, starts
• The Signal Silence Inhibit timer, if configured, starts
• All Non-disconnected indicating programmed to the input are activated provided that
Aux disconnect is not active
If the alarm is a second stage alarm,
• All non-disconnected strobe circuits are activated continuously
• All non-disconnected signal circuits are activated at the evacuation rate
• The General Alarm LED turns on.
If the alarm is a First Stage alarm,
• Non-disconnected strobe circuits programmed to that circuit are activated continuously
• Non-disconnected signal circuits programmed to that circuit are activated with the alert
code
• The Auto General Alarm timer, if configured, starts
• The General Alarm Cancel LED starts flashing.
Subsequent First Stage alarms when the panel is already in alarm, cause the following:
• The buzzer sounds steadily
• If signals have been silenced as a result of the silence button or the Auto signal silence
timer, signals are resounded as they were before signal silence, the Signal Silence LED
turns off, and the Auto Signal Silence timer, if configured, is restarted
• If the panel is not already in General Alarm, additional non-disconnected signals
programmed to the new input are activated with the Alert Code (see Indicating (Signal)
Circuit Types sectionpage 76).
• If the panel is not already in General Alarm and if the General Alarm Cancel LED is on
steady indicating that the Auto General Alarm timer has been Acknowledged the timer is
restarted and the General Alarm Cancel LED is extinguished.
A second stage alarm (general alarm) when the panel is already in alarm causes the following:
• The buzzer sounds steadily
• All non-disconnected signals are activated at the evacuation rate
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