Appendix A: Special Zone Operation Presignal and Positive Alarm Sequence (PAS) Operation
62 NFS-640 Operations Manual P/N 51334:B 10/03/2003
Presignal and Positive Alarm Sequence (PAS) Operation
Overview
This section describes the Presignal and PAS selection, and provides instructions on how to do the
following:
• View Presignal and PAS selections
• Respond to an alarm with Presignal
• Operate the control panel with a Presignal Delay Timer only
• Operate the control panel with a Presignal Delay Timer and PAS
What is Presignal and PAS?
Presignal is a feature that initially causes alarm signals to only sound in specific areas, monitored by
qualified persons. This allows delay of the alarm from 60 to180 seconds after the start of alarm
processing. The control panel Presignal feature provides two selections:
Note: Presignal differs from the Alarm Verification Timer which does not require human intervention.
• A Presignal Delay Timer (60-180 seconds) that delays activation of all outputs with a CBE that
includes Special Zone F0.
• A PAS selection, in addition to the Presignal Delay Timer, that allows a 15-second time period
for acknowledging an alarm signal from a fire detection/initiating device. If the alarm is not
acknowledged within 15 seconds, all local and remote outputs activate immediately and
automatically.
An illustration of Presignal and PAS timing.
Figure 48 Presignal and PAS Time
Presignal Delay Timer (60-180 s)
PAS ( 15 s)
Initial alarm
annunciation
Alarm activates outputs,
if panel is not reset.
If PAS=Y, alarm activates
outputs if not acknowledged
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