Installation and Operation Manual
38
the detectors. It will adjust the thresholds to compensate for a detector going dirty according to the gradual
change in the normal clean air value received. When it can no longer compensate for an increasingly dirty
detector, a dirty detector trouble (Contamination trouble) is indicated for that device.
Alarm Verification
The Alarm Verification function is supported by this panel. One typical alarm verification phase can be divided
into 2 periods. The first period is a retard period in which no alarm reports on the Fire Alarm Control Panel
(FACP). The second period is a confirmation period in which alarm reports on the Fire Alarm Control Panel if a
device is in alarm status. The detail alarm verification phase is illustrated in Figure 39.
Figure 39 Alarm Verification
A - Smoke detector goes into alarm. (LED on device turns to steady on)
AB - Retard Period: Fire Alarm Control Panel senses detector in alarm and delays alarm signal for 48s. During
this period, no alarm event reports on the Fire Alarm Control Panel.
BC - Confirmation Period: Detector is operational for alarm at point B. If the detector is still in alarm at point B,
the Fire Alarm Control Panel will report an alarm. If the detector is not in alarm, the system returns to standby.
If the detector re-alarms at any time during the confirmation period the Fire Alarm Control Panel will alarm.
The period length is 77s.
CD – Restart next alarm verification period if new alarm occurs.
Positive Alarm Sequence (PAS)
When an alarm causing device associated with a zone with PAS feature is initiated, the alert condition is reported
on the panel. The activation of all system evacuation signals are delayed for 15 seconds (PAS delay time) waiting
for a manual acknowledgement response.
If no response is received within 15 seconds, the panel proceeds to activate system evacuation signals. See
Figure A.
If the alarm event is acknowledged during the PAS delay time, the programmable PAS investigation time (180
seconds) is added to the PAS delay time before system evacuation signals are activated. See Figure B.
However, if a 2nd alarm is initiated anytime during the PAS delay time or PAS investigation time, the system
evacuation signals are immediately activated. See Figure C.
Pressing the Reset button at any time during the PAS sequence will initiate a reset condition and try to restore
the panel to stand-by state.
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