Waterflow Circuit Operation 3. Operation of the Control Panel
NFS-640 Operations Manual P/N 51334:B 10/03/2003 39
Silence Inhibit Timer
A timer that disables the
SIGNAL SILENCE key function for the programmed time (0-300 seconds) when
a fire alarm occurs. A Silence Inhibit Timer starts at the first fire alarm and restarts with each new fire
alarm.
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-640 Installation Manual
for information on Waterflow circuits.
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 drive both ends of the loop, maintaining communication in
an unsupervised method. The latching trouble will display on the panel as a Style 6 trouble until you
correct the condition and press reset. Style 7 configuration of the SLC requires the use of ISO-X
modules.
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