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APPENDIX-D: ALARM VERIFICATION
Smoke detector goes into alarm. (LED on device turns to red)
Retard-Reset Period, FACP senses detector in alarm and retards alarm signal.
Retard-Reset-Restart Period – FACP reports alarm verification event and the
supervisory LED is lit on. In this period. no alarm event is reported on FACP. The
duration of this period is adjustable, ranging from 1 s to 60 s. The default value is
60 s.
Alarm Verification Period – Consists of the retard-reset-restart and confirmation
periods.
Detector Restart (Power Up) Period – Power to the detector is reapplied and time is
allowed for detector to become operational for alarm.
Confirmation Period – Detector is operational for alarm at point C. If detector is still in
alarm at point C, FACP will report alarm. If detector is not in alarm, system returns to
standby. If the detector re-alarms at any time during the confirmation period, the
FACP will alarm immediately. The duration of this period is adjustable, ranging from
60 s to 125 s. The default value is 60 s.
Optional Region – Either an alarm can occur on FACP or restart of the alarm
verification cycle can occur.
Alarm Verification CANNOT be active when the system is employing ASD
functions or any other time delay like Positive Alarm Sequence.
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