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Part One – Your Nighthawk CO Alarm
Normal Operating Characteristics
When you first power up the unit, the alarm will sound
briefly to let you know the unit is receiving power and that the
alarm circuit is functioning.
You should see three eights on the digital display, indicat-
ing the alarm is in the start-up mode. The three eights will remain
for approximately 20 seconds. You should
see a blinking red dot to the lower right of
the digital display. The blinking dot shows
that the alarm is operating.
Within 20 seconds, your CO alarm will start
monitoring for CO. The number indicates a measurement of car-
bon monoxide in parts per million (ppm). Note: The number will
probably be zero (0). This is a normal condition for most house-
holds and shows that no measurable amount of CO has been
detected.
The alarm has begun monitoring the air for carbon monoxide and
will continue to do so as long as it receives power.
When the alarm is unplugged or loses power and you
have a good 9V battery installed, the alarm will automati-
cally switch to its battery backup mode and you will notice the
following:
• The digital display will show a blinking dot only – this helps
conserve the battery’s power.
• The digital display will show a number only if it senses
carbon monoxide while in backup mode.
• If CO is detected while on battery backup, alarm pattern
is 4 quick beeps – followed by 5 seconds of silence –
followed by 4 quick beeps. After 4 minutes, alarm pattern
is 4 quick beeps every 60 seconds.
Note: The
alarm
will operate on battery backup for at least 20 hours
.
When AC power is restored, the alarm will automatically switch
back to normal operating mode.
When the alarm is unplugged or loses power and you
have a low battery installed, you will notice the following:
• A fading alarm will sound alerting you the unit has
switched to its backup mode, but the 9V battery is low.
• A blinking dot will be displayed and the sounder will chirp
every 15 seconds.
• When peak level is pushed, the display will alternate
between “Lb.” and CO reading.
When battery is depleted:
• A blinking dot will be displayed and the sounder will chirp
approximately every 30 seconds.
• Pressing the test button will result in a chirp approximately
every one second. The alarm will not detect CO if battery
is depleted. Replace battery.
Constant exposures to high or low humidity
may reduce battery life.
We recommend you replace your 9V battery
at least every six months.
How to Test Your Alarm
There are two aspects of the alarm’s operation that can be test-
ed: the electronics and the sensor response. Instructions on test-
ing each are outlined below and on the next page.
Testing the Electronics
You should test the alarm once a month, following the direc-
tions listed below. If at any time you test the alarm and it does
not perform as described below, have it replaced immediately.
Turn to page 1-6 “How to know if your alarm is malfunctioning”
for a description of the characteristics of a malfunctioning alarm
and what you should do if a malfunction occurs.
Observe the alarm weekly to make sure the red
dot is blinking, indicating normal operation.
If the dot is not blinking, unplug the alarm
for three minutes, then plug in again. This
will clear the alarm for restart. If the dot does
not resume blinking, your alarm may be malfunctioning.
To test the alarm, press the Test/Reset button. If the unit is
operating properly, you should notice the following:
• The display shows three eights , and then shows
a number (usually around 200). You should then hear
4 quick beeps – followed by 5 seconds of silence –
followed by 4 quick beeps. The unit will then show the
three eights for several seconds. It will then return to
monitoring for carbon monoxide.
Familiarize yourself and household members with the alarm pat-
tern described above. In the event of a CO incident, this pattern
will continue to repeat as long as CO is present.
Blinking Dot
Blinking Dot
1-5
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