Kidde 900-0235 User Manual page 14

7. The 900-0234 (with digital display)
Operating Characteristics
Whenever the 900-0234 is operating, the digital display will display "0" to
indicate the unit is monitoring for CO. If the alarm senses dangerous levels
of CO, the digital display will indicate the CO concentration in parts per
million (PPM), and the alarm will emit an audible alarm pattern. This alarm
will display a "0" if CO concentrations between 0 and 30 PPM have been
detected within the last 15 seconds.
When the unit is first powered up, the digital display will show three
"eights" – indicating the alarm is in the start-up mode. The three "eights"
will remain for approximately 20 seconds. After 20 seconds, the alarm
should display "0" and begin monitoring the air for CO and will continue to
do so as long as it receives power.
The following table illustrates the possible digital displays, describes the
audible alarm patterns, and the recommended actions to take.
Operating and Alarm Characteristics
LED Display Shows
A display of CO
concentration from 30-999.
Brief "888" along with
any number between 100
and 300.
Steady "0" displayed.
"Lb" flashes
alternately with
any number.
Steady "Err "displayed
No display alternating with
display of CO concentration
every 60 seconds.
No display alternating with
"0" every 60 seconds.
"End" displayed.
Red LED flashes
every 30 seconds
Alarm Sound Unit Status
4 quick beeps, Alarm condition.
5 seconds silence, Dangerous concentrations
repeating of CO detected
4 quick beeps, Self checking when AC
5 seconds powered (Test button
silence, was pressed or unit
repeated once was first powered)
None Normal AC operation
(sensing no CO) and
with a good battery
One quick beep AC powered and low
every or missing
15 seconds battery
Unit malfunction
One quick beep
every 30 seconds
4 quick beeps, Alarm condition
5 seconds powered on battery
silence, repeating backup. Dangerous
every 60 secs concentrations of CO
detected
None Normal operation after
first 4 minutes of 9 V
battery operation. Unit
monitoring for CO
One quick
End of unit life
beep every 30
seconds
Recommendation
Refer to "What to do
When the Alarm Sounds"
(inside front cover)
None – CO has not been
detected. Numbers
shown for test purposes
only
None
Install or replace 9V
battery
Replace battery.
If "Err" continues, unit
has malfunctioned.
Replace immediately.
Unit will not respond CO
Refer to "What to do
When the Alarm Sounds"
(inside front cover).
Replace battery
Verify AC power is
restored as soon as
possible to conserve
battery. Replace battery
Replace unit immediately.
Unit will not respond to CO