Viking VFR-500 Manual page 44

The following programs are for agent or gas extinguishing systems. Selecting the Agent Release mode allows the use of a pre-
discharge timer and an abort circuit. The timer defaults to 60 seconds for all alarm zones programmed as other than MANUAL
RELEASE. The MANUAL RELEASE default timer is 30 seconds. The system offers the programmer the ability to change the
default timers to shorter times.
Systems intended for the release of Halon 1301 as described in NFPA 12A, water mist systems as described in NFPA 750 clean
agents as described in NFPA 2001 ,or fixed aerosol as described in NFPA 2010, or shall have provision for a pre-discharge
notification circuit. If this signal is required to be separate and/or distinct from the evacuation signal, this can be accomplished
by using the legacy method of using first and second alarms on separate zones. One shall be programmed as FIRST ALARM. It
will provide a steady output upon activation of any initiating zone programmed as an alarm zone. This is the evacuation signal.
If a temporal signal is required, the output pattern can be changed using the zone menu. The other notification circuit shall be
programmed as SECOND ALARM. It will provide a steady output upon activation of a second initiating zone programmed
as an alarm zone (cross zoned). This is when the pre-discharge timer would start and would be the predischarge signal. If a
temporal signal is required, the output pattern can be changed using the zone menu (output pattern and pre release pattern need
to be changed). If a separate signal for discharge were required, the second alarm pre discharge pattern can be changed in the
zone menu. Zones programmed as MANUAL RELEASE will activate outputs programmed as SECOND ALARM, even if the
MANUAL RELEASE zone is the first alarm zone activated. SECOND ALARM is intended to be used as a pre-discharge signal
for cross zone applications.
The VFR-500 allow for 3 patterns using 1 notification circuit. The evacuation signal pattern can be set in the zone menu for the
detection zones mapped to the alarm indicating output. To set the pre discharge pattern and discharge pattern select the pattern in
the zone menu for the software zone for the cross zoned output.
The default programming does not allow the abort circuit to abort the release or stop the pre-discharge timer activated
by zones programmed as MANUAL RELEASE. This can be changed in the programming to allow MANUAL
RELEASE zones to be aborted.
NFPA 12 prohibits the use of abort circuits on suppression systems deploying carbon dioxide.
Systems designed and installed in accordance with NFPA 2001, NFPA-750, NFPA-2010, NFPA 12 A shall be provided with a
mechanical manual release system.
VFR-500 PROGRAM TEMPLATES • 5403799 • REV A • 9/23
CAUTION
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