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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 MCND401, MCND401L, MCND601 and MCND601L,
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 approx. 50 ppm on digital display models.
Although this alarm will not automatically display levels below approx. 50 ppm, it will detect and
store these readings in memory. In typical ambient surroundings, CO concentrations may range
up to 50 ppm, which may be an indication of a temporary or intermittent condition. Sometimes
such a condition may start out as low-level leaks, but can develop into harmful CO concentrations.
If this happens, the CO and gas alarm will detect the dangerous level and alarm which should be
treated as an EMERGENCY. DO NOT ignore high concentration readings above 50 ppm or a CO
and gas alarm.
GAS ALARM: The alarm signal is 1 beep, 1 second pause, repeat. The green LED turns 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 approx. 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 approx. 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 40 seconds. Replace the alarm.
END-OF-SERVICE LIFE ALARM: When it is time to replace your alarm, which is in 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 and hold the TEST/SILENCE or PEAK/RESET button for
approx. 10 seconds until the alarm chirps once and red and blue LED's flash on. Release the
button. The reset is now complete. 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 PEAK/RESET
button for 10 seconds until the peak level is cleared. The alarm will chirp once to indicate the reset
is now complete. 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!
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