40 NFS2-640 Operations P/N 52743:L4 06/10/19
Operation of the Control Panel Waterflow Circuit Operation
3.15 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 NFS2-640 Installa-
tion Manual for information on Waterflow circuits.
3.16 Class A and Class X Operation
Class A and Class X 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, main-
taining communication in an unsupervised method. The trouble will display on the panel as a Class
A trouble until you correct the condition. Class X configuration of the SLC requires the use of ISO-
X isolator modules.
NOTE: In firmware version 18.x (or higher), silenceable outputs activated from a WATERFLOW
type code activation can be silenced if the silenceable waterflow option is enabled via VeriFire
Tools.
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