NFS-320/E/C, NFS-320SYS/E Operations Manual — P/N 52747:E1 06/16/2011 33
Waterflow Circuit Operation Operation of the Control Panel
Alarm Verification Timer
A timer that directs the control panel to ignore a fire alarm for a smoke detector, programmed for
Alarm Verification, while the Alarm Verification Timer is counting.
Table 3.8 contains a summary
of how the Alarm Verification Timer works.
Silence Inhibit Timer
A timer that disables the SIGNAL SILENCE key function and inhibits reset during countdown for the
programmed time (0-300 seconds) when a fire alarm occurs. A Silence Inhibit Timer starts at the
first fire alarm. Subsequent alarms will not restart the timer until the alarm condition is completely
resolved and a panel reset is performed.
3.14 Waterflow Circuit Operation
If a monitor module programmed with a WATERFLOW Type Code initiates a fire alarm, the control
panel disables the
SIGNAL SILENCE key and the Auto Silence Timer. Refer to the NFS-320
Installation Manual for information on Waterflow circuits.
3.15 Style 6 and Style 7 Operation
Style 6 and Style 7 are supervised methods of communicating with addressable devices. If the
control panel detects a trouble (open or short), it will attempt to drive both ends of the loop,
maintaining communication in an unsupervised method. The trouble will display on the panel as a
Style 6 trouble until you correct the condition. Style 7 configuration of the SLC requires the use of
ISO-X isolator modules.
If The control panel does this
A second fire alarm occurs while the
Alarm Verification Timer is counting
Ignores the Alarm Verification Timer
The Alarm Verification Timer elapses and
a fire alarm still exists
Activates the fire alarm
The Alarm Verification Timer expires and
a fire alarm no longer exists
Increments the Alarm Verification counter (up to 99)
for the device and returns to normal operation
Table 3.8 Alarm Verification Timer Operation
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