How Your Co Alarm Works - First Alert MODEL FCD3N User Manual

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
BATTERY SERVICE ALARM
MOVE TO
2
FRESH AIR
3
4
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.
TEST/
1
SILENCE
5
3