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Alecto COA3920 Manual

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CO detector.
• This CO detector only sounds the alarm when carbon monoxide is present at its sensor.
Therefore, it’s possible for carbon monoxide to be present elsewhere and the alarm doesn’t
sound.
• When the alarm sounds, possible harmful carbon monoxide levels are present!
Carbon monoxide can be deadly!
CO
concentration
Period of inhaling and symptoms
50PPM The maximum concentration a healthy adult can withstand in 8 hours.
200PPM After 2-3 hours, mild headache, sensations of weakness, dizziness, nausea.
400PPM Within 1-2 hours, ache in forehead; after 3 hours, life-threatening.
800PPM Within 45 mins, dizziness, nausea, convulsions; Loss of consciousness within 2 hours;
Fatal within 2-3 hours.
1600PPM Within 20 mins, headache, dizziness, nausea; Fatal within 1 hour.
3200PPM Within 5-10 mins, headache, dizziness, nausea; Fatal within 25-30 mins.
6400PPM Within 1-2 min, headache, dizziness, nausea; Fatal within 10-15 mins.
12800PPM Fatal within 1-3 min.
Alarm
When the CO detector sounds the alarm, carbon monoxide (CO) might be present
which can be fatal. Therefore, never ignore this alarm.
When alarmed, the red ALARM LED will blink rapidly 5 times and emit 5 short audible beeps. The alarm
cycle will repeat 3 times every 10 seconds. Once the carbon monoxide concentration falls below 40PPM the
alarm will stop.
If the CO concentration exceeds 30PPM for 60 minutes or 40PPM for 40 minutes the low CO concentration
alertwillsound.Onceevery5minutes,theredalarmLEDwillsimultaneouslyash4timesand4short
sounds will sound.
What to do when the alarm sounds:
1. Open doors and windows and immediately do outside into the fresh air. Check whether
everybody has left the building.
2. Callanofcialinstallertoinspectthecorrectfunctioningandstateofmaintenanceofthe
combustion source (gas or oil powered equipment) that could be the cause for the CO
alarm.
3. Only enter the building again after the cause has been resolved and the building has been
well ventilated.
The alarm sound can be turned off for up to 10 minutes (Hush function) by pressing and holding the TEST
key for 3 seconds (<200PPM).
The time the hush function is active depends on the measured CO concentration. The hush time decreases
as the CO concentration increases. Above 200PPM the hush function is not possible.
When the CO concentration drops, the alarm will eventually stop automatically. During the hush function,
press the test button to immediately disable the hush function and make the alarm audible.
… 34 …


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