20 NFS-320/E/C, NFS-320SYS/E Operations Manual — P/N 52747:E1 06/16/2011Operation of the Control Panel Carbon Monoxide (CO) Alarm Mode of Operation3.4 Carbon Monoxide (CO) Alarm Mode of Operation3.4.1 How the Control Panel Indicates a CO AlarmWhen a CO alarm from a FCO-851 or monitor module with a CO monitor activates due to a COalarm 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 tothe device, as shown below:Figure 3.4 Sample CO Alarm Display• Sends a CO alarm message to the LCD display, remote annunciators, History buffer, installedprinters, and CRT-2s.• Latches the control panel in CO alarm. (You can not return the control panel to normaloperation 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 alarmIf 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, remoteannunciators, and CRT-2s. The figure below shows a sample Alarm silenced message.Figure 3.5 Sample Alarm Silenced Message1. 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 thecontrol panel to normal operation (indicated by the “System Normal” message). The controlpanel 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 forthis device locationDevice addressTime and date of troubleExtended 12 charactercustom labelA L A R M : C O I N T E N S I V E C A R E U N I TE A S T E R N W I N G Z 0 0 4 0 3 : 1 0 P 0 1 1 5 1 1 2 M 1 4 7ZoneStatus banner Time and date of theAlarm SilencedS I G N A L S S I L E N C E D 0 3 : 1 2 P 0 1 1 5 1 1 T u e