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Part One – Your Nighthawk CO and Gas Alarm
Wall Mounted Alarm
First, refer to “Where to Install Your CO
and Gas alarm” on page 1-3 for general
guidelines as to where to locate your CO
and Gas alarm.
Installation tips for power cord models:
The power cord option provides more
flexibility in mounting locations and
allows the alarm to be easily installed at
eye level.
Note: If you mount the alarm high on a
wall, make sure it is at least 6" from the
ceiling. Any higher than this, it will be in
“dead air space” and carbon monoxide or
natural Gas may not reach the sensors.
Note: Do not cover the alarm with a curtain.
For a wall-mount, you will need to pull out the removable
adapter and power cord. This simple process as outlined below.
To install:
1. Follow steps 1 - 4 in the previous column under “To Rotate
Adapter.”
2. With adapter out, pull out power cord and unwrap it.
3. With cord extended, press last few inches into cord recess.
Gently pull cord at bottom of cord recess until cord becomes
taught and lays flat in cord recess.
4. Carefully replace back door by making sure
“latches” on all four corners of door are lined up,
then firmly press into place.
5. Insert the screws provided until head is approx.
1/8” from wall (If mounting in plaster board or dry-
wall, drill 3/16 hole and use plastic anchor provid-
ed). Use mounting guide template in back of user’s
guide to locate holes.
6. Hook the Nighthawk CO and Gas alarm unit over the screw
onto keyhole in back of unit.
7. Plug cord into electrical outlet.
Table Top Alarm
You can also use your Nighthawk CO and Gas alarm as a table top
unit. Simply follow the above steps for removing adapter, then
instead of mounting to a wall, simply pull out slide support and
stand on table, bedside stand, chest of drawers, etc. (refer to diagram
on page 1-1).
Back of unit when used
as a wall mount for
natural gas and CO
detection
WALL
1/8"
1-5
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, indicating
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 digi-
tal display. The blinking dot shows that the
alarm is operating.
Within 20 seconds, your CO alarm will start
monitoring for CO. Within 2 minutes your
alarm will start monitoring for Gas. Note: The number will probably
be zero (0). This is a normal condition for most households and
shows that no measurable amount of CO or Gas is being detected.
The alarm has begun monitoring the air for carbon monoxide and Gas
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 automatically switch
to its battery backup mode and you will notice the following:
• After 4 minutes the digital display will show a blinking dot
only – this helps conserve the battery’s power.
• The digital display will show a number for CO or show
“GAS” only if it senses carbon monoxide or Gas 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, this alarm pattern
occurs only every 60 seconds.
• If Gas is detected while on battery backup, the unit will display
Gas and alarm continuously. The alarm pattern for Gas is a 1/2
second alarm on, 1/2 second of silence -repeating. For the first
four minutes after the unit goes into battery backup operation,
the explosive gas sensor will operate as if on AC power.
However, after four minutes, to extened battery life, the unit will
go into battery conserve mode and will only sample
for explosive gas once every eight minutes. Explosive gas could
be present during this 8-minute period without the unit going
into alarm. If the alarm is on battery backup for an extended
period of time, replace the battery to ensure maximum protect-
tion is provided. The battery will last only a couple hours in a
Gas alarm condition.
Note:
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.
Blinking Dot
CO/Gas Alarm Manual Rev. C 3/21/01 11:37 AM Page 10