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4.16 Synchronized NAC Operation
Synchronization is a panel feature that controls the activation of notification appliances in
such a way that all devices will turn on and off at exactly the same time. This is
particularly critical when activating strobes which must be synchronized to avoid random
activation and a potential hazard or confusion. The FACP can be programmed to operate
with a variety of manufacturer’s devices.
Important: When a Notification Appliance Circuit with a mix of audible and visual
devices is programmed for silenceable and the synchronization feature is selected, only
the audible devices will be turned off if the Silence key is pressed. The visual devices
(strobes, etc.) will continue to operate.
4.17 Coded Operation
The two NAC circuits resident on the control panel main circuit board can be programmed
for coded operation. The available pulse rates which can be programmed for coded
operation are as follows:
• Continuous: Steady output with no pulsing
• March Time: Pulses at 120 ppm (pulses per minute)
• Temporal Code: Pulses at ½ second On, ½ second Off, ½ second On, ½
second Off, ½ second On, 1½ second Off
• California Code: 10 seconds On, 5 seconds Off
• Two-Stage Pulses at 20 ppm (pulses per minute) for 5 minutes and
then changes to on steady
4.18 Presignal
Presignal option programs an initiating device to delay the activation of NACs and/or
control modules while allowing visual verification by a person. Once a detector or
monitor module triggers an alarm, the onboard piezo sounds immediately, but the NACs
are not activated for a user programmed time duration of up to three minutes. Note that the
alarm relay and communicator will respond to the initial alarm immediately. In addition,
Zone 98 will activate. This zone can be programmed to a control module which may be
used to activate a sounder or indicator which the installer designates as a Presignal
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After the programmed delay, the NACs will activate if the source of the alarm is not
cleared. Note that if a second alarm occurs during the programmed time delay, the alarm
will be processed immediately, causing activation of the appropriate output zones. The
events which occur upon Presignal activation are as follows:
✓ onboard piezo sounds immediately
✓ control panel LCD display will indicate a presignal event and the active point
✓ control points programmed to Zone 98 will activate
✓ annunciators (if enabled) will sound the local piezo, and pulse the alarm LED and
zone LED
✓ outputs (NACs and control modules) of associated zones will be inhibited from
activating for a user programmed time delay of up to three minutes
✓ second alarm occurring anytime during the time delay will cause immediate
activation of all associated outputs
Presignal does not affect monitor modules programmed as waterflow, supervisory, process
monitoring or remote switches. Presignal operation requires the approval of the local
Authority Having Jurisdiction.