Presignal and Positive Alarm Sequence (PAS) Special Zone Outputs
NFS-3030 Programming Manual P/N 51345:C 11/4/03 103
Appendix C: Special Zone Outputs
C.1 Presignal and Positive Alarm Sequence (PAS)
What is Presignal and PAS?
Purpose
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 up to 180 seconds after the start of alarm
processing. The control panel Presignal feature provides two selections:
•A Presignal Delay Timer (1:00 to 3:00 minutes) that delays activation of all outputs with a
CBE that includes Special Zone ZF0.
•A PAS (Positive Alarm Sequence) 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.
Appendix Figure C-1 Presignal and PAS Time
The control panel delays activation of outputs containing ZF0 in their zone maps for all alarm
initiating devices that contain ZF0 in their CBE list. A subsequent alarm will abort the Presignal
Delay Timer and execute CBE lists.
Notes on using ZF0
•NFPA 72 requires installation of a PAS Inhibit switch, that can be used to turn off the PAS
delay timer when the control panel is unattended. Do so by programming a monitor
module with the Type Code,
PAS INHIBIT.
•The Presignal Delay timer countdown can be stopped by pressing the SYSTEM RESET key
before the timer expires.
•Program zone ZF0 to participating inputs and outputs.
Restrictions on using ZF0
•Do not include ZF0 in the CBE list for a releasing device.
•Do not include ZF0 in the CBE list for any monitor module that connects to a device other
than an automatic fire detector.
Initial alarm
annunciation
Alarm activates outputs, if the
control panel is not reset
If PAS=Y, alarm activates
outputs if not acknowledged
Presignal Delay Timer (60-180 s)
PAS (15 s)
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