Notifier NFS-320 - 3.5 System Trouble Mode of Operation

NFS-320/E/C, NFS-320SYS/E Operations Manual — P/N 52747:E1 06/16/2011 21
System Trouble Mode of Operation Operation of the Control Panel
3.4.3 Interpreting CO Alarm/Supervisory Type ID Codes
The Type Code that displays in the CO alarm message indicates the function of the point that
initiates the CO alarm. For example, a monitor module with a
CO MONITOR Type Code means that
the monitor module monitors a conventional CO Detector. The table below lists the Type Codes
that can appear in an alarm message:
Table 3.2 CO Alarm Type Codes
3.5 System Trouble Mode of Operation
3.5.1 How the Control Panel Indicates a System Trouble
The system goes into system trouble when the control panel detects an electrical fault. If no fire
alarms exist, the control panel does the following:
• Produces a pulsed audible tone
• Activates the Trouble relay (TB4)
• Flashes the SYSTEM TROUBLE LED
• Displays a Type Code that indicates the type of device with a trouble.
•Displays TROUBLE in the status banner on the LCD display as well as the type of trouble and
information specific to the device, as shown in
Figure 3.6 below.
• Sends a Trouble message to the LCD display, history buffer and installed printers, FDU-80
annunciators, and CRT-2s.
Type Code
Latching
(Y/N)
Purpose What it does
Monitor Modules
CO Monitor* Y Indicates activation of a CO conventional detector Activates CBE, CO alarm does not light an
indicator at the control panel.
Detectors
Photo/CO* Y Indicates activation of the Photo, Heat, or CO element of
a detector
Activates CBE, CO alarm does not light an
indicator at the control panel.
Photo/CO (C Sup)* Y Indicates activation of the Photo, Heat or CO element of
a detector.
Activation of the Heat or Photo elements
will light an indicator at the control panel.

Activation of the CO element will light the
SUPERVISORY LED. Activates the CBE
Photo/CO (P Sup)* Y Indicates activation of the Photo, Heat or CO element of
a detector.
Activation of the Heat element will light an
indicator at the control panel.

Activation of a CO alarm will not light an
indicator at the control panel.

Activation of the Photo element will light the
SUPERVISORY LED. Activates the CBE
*FlashScan mode only
NOTE: If a fire alarm exists when a trouble exists, the SYSTEM TROUBLE LED lights, but the Alarm
message appears in the LCD display.