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IMPORTANT!
The battery backup is designed to provide short-term emergency power to the CO and Gas Alarm.
Actual backup time depends on the strength (freshness) of the battery. The battery backup will not
work unless a good battery is properly installed.
When the alarm utilizes battery backup power, the natural gas sensor will operate the alarm and will
sample less frequently to extend battery life. Natural gas could be present during this period between
samples without the alarm sounding, especially if there is a rapid buildup of natural gas.
UNDERSTANDING YOUR ALARM
NORMAL OPERATION: In normal operation, the alarm will blink the green LED off once
approximately every 20 seconds.On Models MCND401CN, MCND401LCN, MCND601CN and
MCND601LCN, the screen will display three dashes "- - -"
LOW BATTERY ALARM: If the alarm chirps once approx. every 40 seconds, please verify that the
battery activation pull tab has been completely removed, the battery polarity is correct and the
battery terminals are making contact with the alarm contacts in the battery compartment. If the
battery continues to chirp, replace the 9 volt battery.
CO ALARM: The alarm signal is 4 beeps, 5 second pause, repeat. The green LED turns off when
the 4 beeps start. The red LED blinks in sync with the cycle of 4 beeps. The screen will indicate the
current CO readings if higher than 40 ppm on digital display models.
GAS ALARM: The alarm signal is 1 beep, 1 second pause, repeat. The green LED blinks off. The
blue LED blinks in sync with the horn beep every second. The screen will display "gas" on digital
display models.
NUISANCE ALARM: If the horn signals for no apparent reason and no obvious hazard is present,
please verify that the alarm is mounted in the correct location. Reset the alarm as instructed in the
Operational Summary.
CO ALARM LATCHING LED INDICATOR: The alarm had previously detected CO and had alarmed.
The red LED is off and blinks on every 5 seconds until reset. Follow the reset instructions to remove
the latching LED (see below).
GAS ALARM LATCHING LED INDICATOR: The alarm had previously detected GAS and had
alarmed. The blue LED is off and blinks on every 5 seconds until reset. Follow the reset instructions
to remove the latching LED (see below).
TROUBLE / SERVICE ALARM: Periodically, the alarm measurement circuit is tested. If an error is
detected, the alarm will sound 3 chirps approx. every 20 seconds . Replace the alarm.
END-OF-SERVICE LIFE ALARM: When it is time to replace your alarm, which is approximately 7
years of operation from initial power up, the alarm will sound 2 chirps approx. every 20 seconds. The
alarm signal cannot be reset - the alarm should be replaced immediately.
RESET THE ALARM LED's: Press the TEST button for 2 seconds and then release. This will clear
the alarm LED's and clear the SILENCE mode.
RESET THE PEAK CO MEMORY (digital display models only): Press and hold the RESET button
for 5 seconds until the peak level is cleared. The display screen will display "000" when the peak CO
level is reset and then return to "- - -"
IF YOUR CO AND GAS ALARM SOUNDS
WHAT TO DO IF CARBON MONOXIDE IS DETECTED:
If you hear the alarm horn sound 4 beeps, a 5 second pause (and then repeat),
carbon monoxide has been detected. Evacuate everyone from the building.
Actuation of your CO Alarm indicates the presence of carbon monoxide (CO), which can kill you. In
other words, when your CO Alarm sounds, you must not ignore it!
Some individuals are more sensitive to CO than others, including people with cardiac or respiratory
problems, infants, unborn babies, pregnant mothers or elderly people can be more quickly and
severely affected by CO. Members of sensitive populations should consult their doctors for advice
on taking additional precautions.