20 NFS-320/E/C, NFS-320SYS/E Operations Manual — P/N 52747:E1 06/16/2011
Operation of the Control Panel Carbon Monoxide (CO) Alarm Mode of Operation
3.4 Carbon Monoxide (CO) Alarm Mode of Operation
3.4.1 How the Control Panel Indicates a CO Alarm
When a CO alarm from a FCO-851 or monitor module with a CO monitor activates due to a CO
alarm event, the control panel does the following:
• Produces a pulsed audible tone (if the piezo is enabled)
• Displays a CO alarm event that indicates the type of device that activated the CO alarm
•Displays ALARM in the status banner on the LCD display, along with information specific to
the device, as shown below:
Figure 3.4 Sample CO Alarm Display
• Sends a CO alarm message to the LCD display, remote annunciators, History buffer, installed
printers, and CRT-2s.
• Latches the control panel in CO alarm. (You can not return the control panel to normal
operation until you correct the CO alarm condition and reset the control panel.)
• Initiates any Control-By-Event actions and activates special function zone FC.
3.4.2 How to Respond to a CO alarm
If the control panel indicates a CO alarm, you can do the following:
• To silence only the panel sounder:
Press the ACKNOWLEDGE/SCROLL DISPLAY key. The local sounder will silence.
The control panel will send an acknowledge message to the LCD display, remote annunciators,
history buffer, installed printers, and CRT-2s
• To silence the panel sounder and any activated outputs that are programmed as silenceable:
Press the SIGNAL SILENCE key. The SIGNAL SILENCE LED will light steady.
The control panel sends an Signal Silenced message to the History buffer, installed printers, remote
annunciators, and CRT-2s. The figure below shows a sample Alarm silenced message.
Figure 3.5 Sample Alarm Silenced Message
1. Check the Alarm message for the location and type of trouble.
2. Correct the condition causing the CO alarm.
3. When you finish correcting the CO alarm condition, press the
SYSTEM RESET key to return the
control panel to normal operation (indicated by the “System Normal” message). The control
panel sends a “System Normal” message to the LCD display, History buffer, installed printers,
FDU-80 annunciators, and CRT-2s.
Status banner
Type Code of initiating device
Custom descriptor for
this device location
Device address
Time and date of trouble
Extended 12 character
custom label
ALARM: CO INTENSIVE CARE UNIT
EASTERN WING Z004 03:10P 011511 2M147
Zone
Status banner
Time and date of the
Alarm Silenced
SIGNALS SILENCED
03:12P 011511 Tue
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