Part one – your nighthawk co and gas alarm – Nighthawk KN-COEG-3 User Manual

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How to Test Your Alarm (continued)
Pressing the Test/Reset button tests the functions of the
alarm’s internal components, circuitry and micro-computer. YOU
CO readings or the presence of Gas are
automatically shown on the alarm’s digital display. If the alarm
shows zero (0), then no measurable amount of CO or Gas has
been sensed by the alarm within the past 15 seconds.

Testing the sensor response
While it is not required, on occasion you may wish to observe
and become familiar with your alarm’s response in the actual
presence of carbon monoxide or Gas. The best and safest way
to do this is with either a cigarette or an incense stick. To per-
form this test you will need: your alarm, a butane lighter, an ash-
tray, and either a cigarette or an incense stick.

CAUTION: Please refer to the “Frequently Asked Questions”
section for warnings on how NOT to test the sensor response.

WARNING: This test should be done by adults only. Children
should be warned never to light matches or butane lighters.
Please use caution when performing the test described below.
Avoid burns from flame or hot materials. Avoid inhaling exces-
sive smoke from the cigarette or incense stick. Extinguish all
flames and properly discard all hot materials.


Step 1. With a match or a lighter, light a single cigarette or
incense stick. Extinguish the match or lighter. Make sure an
ashtray is available to discard ashes, matches and the burned
cigarette or incense stick.

Step 2. Hold the smoldering cigarette or incense stick 2-3 inches
directly below the bottom air vents of the CO and Gas alarm,
making sure the stream of smoke rises into the vents.

Step 3. Continue holding the cigarette or incense stick directly
below the alarm for 3 - 5 minutes or until you see a reading on
the display. Note: Do not hold the cigarette or incense stick clos-
er than one inch to the alarm as smoke will cause a yellow stain
to develop on the alarm’s outer case.

Step 4. Your unit will probably not alarm during this test. If it
does, you can silence it by pressing Test/Reset button and remov-
ing the source of CO.

Step 5. Extinguish the cigarette or incense stick by pressing the
smoldering tip into the ashtray.

Part One – Your Nighthawk CO and Gas Alarm

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 sensors 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 , then shows the

word “GAS” in the display while the unit is sounding 3
half second beeps. Then, the display shows a number (usu
ally around 200). You should then hear 4 quick beeps –
followed by 5 seconds of silence – followed by 4 quick
beeps repeating until reset stops. The unit will then show
the three eights for several seconds. It will then return to
monitoring for carbon monoxide and Gas.

Familiarize yourself and household members with the alarm pat-
tern described above for a Gas event and a CO event. While on
AC power, in the event of a CO or Gas incident, the appropriate
pattern will continue to repeat as long as CO or Gas is present.

• A blinking dot will be displayed and the sounder will chirp

every 15 seconds.

• The display will alternate between “Lb.” (low battery) and

CO reading while chirping.

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 or gas if
battery is depleted. Replace battery.

Blinking Dot


CO/Gas Alarm Manual Rev. C 3/21/01 11:37 AM Page 11