First Alert MODEL FCD3N - Manual (Page 4)

3
HOW YOUR CO ALARM WORKS
General Information
A CO Alarm measures the CO levels in the air. It
will alarm if CO levels rise quickly (if the heat
exchanger on your furnace breaks, for
example), or if CO is consistently present (a
slow CO leak on a fuel-burning appliance).
This carbon monoxide alarm features a
permanently installed sensor, three colored
indicator lights, and an 85 dB alarm horn. It also
has a silence feature to temporarily quiet the
alarm horn.
The Cover of Your CO Alarm
1 Test/Silence Button:
2 BATTERY Light
(Dual Color —
Green or Yellow)
3 SERVICE Light (Yellow)
4 ALARM Light (Red)
5 (Behind Cover) Alarm Horn: 85db
audible alarm for test, alarm, and unit
malfunction warning.
1
2
3
5
BATTERY SERVICE ALARM
MOVE TO
FRESH AIR
4
TEST/
SILENCE
M06_1042_001.E Page 3 Wednesday, July 12, 2000 9:26 AM