Nighthawk Carbon Monoxide Alarm KN COP DP User Manual

Limited Warranty  
Warranty Registration  
By KIDDE Safety  
To register for your five year factory warranty, please fill out the  
enclosed warranty card completely, apply necessary postage and  
place in the mail. You may place the warranty card in a sepa-  
rate envelope if you wish.  
AC Powered  
Please use the following address for warranty  
registration ONLY:  
Carbon Monoxide  
KIDDE Safety  
Product Registration Department  
PO Box 8748  
Denver, CO 80201-8748  
Alarm  
User’s Guide  
Please send products and all other  
correspondence to:  
Nighthawk CO Alarm with  
Digital Display and Peak  
Level Memory  
KIDDE Safety  
Attn.: Customer Service Department  
1394 South Third Street  
Mebane, NC 27302  
Power Cord Models (KN-COP-C)  
Hardwire Models (KN-COP-HW)  
Direct Plug Models (KN-COP-DP)  
Warranty information is located on the label on the back of the  
CO alarm. For your convenience, please complete the warranty  
information before installing the CO alarm.  
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For questions concerning your  
Carbon Monoxide Alarm, please  
call our Consumer Hotline at  
1-800-880-6788.  
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The model number and assembly number can be found on the  
label on the back of the CO alarm.  
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For Warranty Service:  
In many cases the quickest way to exchange your CO alarm is to  
return it to the original place of purchase. If you have questions,  
call the KIDDE Safety customer service department at 1-800-880-  
6788 for assistance.  
Please have the following  
information ready when calling:  
CO Alarm Model Number (Located on the back of alarm):  
CO Alarm Assembly Number (Located on back of alarm):  
member  
Date of Manufacture (Located on back of alarm):  
Date of Purchase:  
1394 South Third Street, Mebane, NC 27302  
Consumer Hotline: 1-800-880-6788  
Where Purchased:  
Custom Assembled in Mexico with U.S. and Foreign Components.  
810-1009 REV. C  
5/01  
 
About This User’s Guide  
Introduction  
Notice we call this booklet a “User’s Guide” and not an “Owner’s  
Manual.” This is because our intention is you use this guide just as  
you will be using your Nighthawk CO alarm. Keep the guide in a  
handy location and refer to it when you have questions about your  
CO alarm, its functions and features, or if you have questions about  
carbon monoxide. It will take about an hour of your time, but it’s well  
worth it. Please read it in the sequence presented. Reading this guide  
is the only way to learn how to use your CO alarm wisely and to  
know how to react in the event of an alarm.  
This Nighthawk carbon monoxide (CO) alarm is an important part of  
your family’s home safety plan. So important, the U.S. Consumer  
Product Safety Commission (CPSC) recommends that every household  
should have at least one carbon monoxide alarm. In fact, the CPSC  
chairman has said that CO alarms are “as important to home safety as  
smoke alarms.” Yet because CO alarms for the home haven’t been  
available until recently, most people haven’t had much experience  
using them. As a new owner of a CO alarm, there are some basic  
facts you should know for your protection and convenience.  
Part One  
Many people think that CO alarms operate like smoke alarms. And  
in some basic ways, this is true. Like smoke alarms, CO alarms con-  
tinuously monitor the air in your home and sound a loud alarm to  
warn you of trouble.  
Your Nighthawk Carbon Monoxide Alarm, covers the unique  
features of your Nighthawk carbon monoxide alarm, how and where  
to install it, as well as information on testing and maintaining your CO  
alarm.  
But, the similarities end here. The way you respond to a CO alarm  
is quite different than that of a smoke alarm. That’s because a house  
fire and a carbon monoxide problem are two distinctly different situa-  
tions. If your smoke alarm were to alarm, you would quickly be able  
to judge the level of danger you were in (if any) with your five sens-  
es: you could see and smell the smoke, you could feel the heat, you  
could see and even hear the fire burning. You could also readily see  
if your smoke alarm were alarming in a non-emergency situation, say  
if someone smoked up the kitchen with some seriously burnt toast.  
Because your sense of sight, smell, hearing and touch give you so  
much information, you could almost instantly judge what action to  
take if you heard your smoke alarm.  
Part Two  
Carbon Monoxide - The Silent Killer, contains valuable informa-  
tion about carbon monoxide (CO). From discovering the most com-  
mon sources of CO in your home to recognizing the symptoms of CO  
poisoning, this section provides tips and information that could help  
protect your family from carbon monoxide poisoning.  
Part Three  
What You Should Know Before the Alarm Sounds, describes  
the effects of exposure to CO levels over time and when your  
Nighthawk CO alarm will alarm. It also tells you how to determine  
who is at high risk for CO poisoning.  
But now, what about a CO alarm? Carbon monoxide (CO) is invisi-  
ble, odorless, tasteless and non-irritating–completely undetectable to  
your five senses. That’s why it’s so important to your safety that you  
have a carbon monoxide alarm. But, how do you know what to do if  
your unit alarms?  
Part Four  
What to do When the Unit Alarms, gives you step-by step infor-  
mation on how to respond to an alarm situation. Also covered is  
whom to call for help if you think you have CO in your home.  
Part Five  
You have to learn what to do, because your five senses won’t tell  
you. That’s why this user’s guide is so important. Please take the  
time to read this guide from cover to cover, to familiarize yourself  
with the facts about carbon monoxide, how your new alarm works,  
and what to do if it alarms. Then, find a handy place to keep the  
guide so it will be readily available in the future when you have a  
question. You might want to write down KIDDE Safety’s toll-free cus-  
tomer service number and keep it with your other important phone  
numbers for the same reason.  
Technical Information, covers the technical specifications of your  
Nighthawk CO alarm.  
Part Six  
Frequently Asked Questions, contains the most commonly asked  
questions about our alarms. Part six was written by KIDDE Safety  
customer service representatives who handle thousands of calls per  
month, year-round. This section provides you with answers and tips  
that will most likely answer any questions you might have after read-  
ing this user’s guide.  
Thank you for making Nighthawk a part of your complete home safe-  
ty program. With proper installation and use, your new Nighthawk  
CO alarm should provide you with years of dependable service.  
 
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Quick Set Up Guide  
Quick Set Up Guide  
Step 5  
We urge you to read this entire manual  
in the sequence it is presented. But, if  
you only read one part of this manual  
initially, read these two pages!  
Make sure the red dot in the digital display is blinking. Then test the  
alarm’s operation by pressing the Test/Reset button and releasing.  
Within 15 seconds you will hear 4 quick beeps – 5 seconds off – then  
4 quick beeps. For complete testing information, refer to page 1-10.  
Listed below are six easy steps for setting up your Nighthawk CO  
alarm. Please read the entire guide for complete information.  
Step 6  
While testing the alarm, have someone else check that the alarm can be  
heard easily from the sleeping areas. The CO alarm should be located  
where it can wake you if it alarms at night. See page 1-5 for complete  
information on the best locations for your CO alarm.  
Setting up your CO alarm for first time operation:  
Step 1  
Caution: Continuous exposure to the loud 85 decibel alarm at close  
range over an extended period of time may cause hearing loss.  
Determine the best location for your CO alarm(s). Usually this is in or  
near bedrooms. Refer to page 1-5 for complete information.  
That’s it. Your Nighthawk CO alarm is now monitoring for the presence  
of carbon monoxide.  
Step 2  
If your CO alarm is equipped with a power cord, mount the alarm on  
the wall at eye level using the hardware provided. Eye level is the best  
position to easily see the digital display. If your CO alarm is equipped  
with a direct plug, simply plug in (you can rotate the plug if neces-  
sary) For hardwire units and for detailed instructions on mounting all  
alarms, refer to page 1-7,8.  
Step 3  
Plug the CO alarm into a standard, unswitched 120 volt AC electric out-  
let. If you have a direct plug model, mount the CO alarm with digital  
display at the top. You will hear the alarm sound briefly to indicate the  
unit is receiving power. Refer to page 1-9 for more details.  
Step 4  
You will first see three eights  
in the digital display indicating the  
CO alarm is warming up. After approximately 30 seconds, the first read-  
ing will appear on the digital display. The number on the digital display  
should be zero (0). If not, see page 1-9 for complete information on  
normal operating characteristics.  
 
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Part One – Your Nighthawk CO Alarm  
Part One – Your Nighthawk CO Alarm  
Nighthawk CO Alarm– rear view  
About Your CO Alarm  
The number one feature that sets Nighthawk apart from other  
alarms is its unique digital display that gives you a continuous read-  
out of CO levels from 30-999 parts per million. The digital  
display serves as an early warning of CO presence. Additionally, the  
digital display gives you added time to find the source of the CO  
and correct the problem, limiting the risk of unrecognized long term  
exposure. Of course, the loud 85 decibel alarm warns of higher lev-  
els, even while you’re sleeping.  
Power cord unit  
(KN-COP-C)  
Direct plug unit  
(KN-COP-DP)  
90˚ Rotating  
Direct Plug  
While many other CO alarms require costly sensor or battery pack  
replacement, there are no replacement parts on Nighthawk CO  
alarms. And Nighthawk is the only CO alarm that gives you the  
choice of a direct-plug, a 6' power cord or a hardwire unit.  
Depending on how or where you wish to mount your alarm, you  
can get exactly what you need for a perfect application. These are  
just a few reasons over 4.5 million families have chosen Nighthawk  
over every other brand for this kind of life-saving protection.  
Keyholes  
Nighthawk CO Alarm – front view  
Vents  
Sounder  
Alarm  
Standard Plug  
Approx. 8 ft.  
(provided)  
Hardwire unit  
(KN-COP-HW)  
Test/Reset  
Button  
Digital  
Display  
Mounting Plate  
(provided)  
TEST-  
RESET  
PPM of CO  
Move to Fresh Air  
Mounting  
Screws  
(provided)  
C
ARBON  
ONOXIDE  
LARM  
M
PEAK  
LEVEL  
A
Blinking  
Red Dot  
Peak Level  
Button  
Wire Nuts  
(provided)  
Vents  
 
1-1  
1-2  
Part One – Your Nighthawk CO Alarm  
Part One – Your Nighthawk CO Alarm  
Nighthawk’s Unique Features  
What Carbon Monoxide Alarms Can and Cannot Do  
CO alarms provide early warning of the presence of carbon monox-  
ide, usually before a healthy adult would experience symptoms.  
Digital Display  
This continuous digital display shows you the level of carbon monox-  
ide (if any) the unit is sensing. The unit updates this reading every 15  
seconds so you can watch levels rise or fall.  
Note: If the alarm does not sense any CO, the reading is zero (0). In  
most homes, the alarm reads “0” all the time. A reading of “0” is  
expected under normal conditions, and is good. The blinking dot  
after the number shows you the unit is operating.  
This early warning is possible, however, only if your Nighthawk CO  
alarm is located, installed and maintained as described in this user’s  
guide.  
This CO alarm is designed to act as a continuous monitor, it is not  
designed for use as a short-term testing device to perform a quick  
check for the presence of CO.  
Test/Reset Button  
CO alarms have limitations. Like any other electronic device, CO  
alarms are not fool-proof.  
This button has two functions. First, this is the button you press when  
you test the unit weekly (see pages 1-9,10,11 for further details).  
Secondly, you press this button if the unit alarms and you want to  
turn it off. This will reset the unit and it will then again start monitor-  
ing for CO. If CO concentration is above 70 ppm, the CO alarm will  
sound within 60 minutes. (More on this on page 5-2).  
CO alarms have a limited operational life. You must test your CO  
alarm weekly, because it could fail to operate at any time. If your  
CO alarm fails to test properly, or if its self-diagnostic test reveals a  
malfunction, immediately have the CO alarm replaced. See back page  
for warranty information.  
Peak Level Button  
By depressing this button, you can see the peak CO level recorded  
by the alarm since it was last reset or unplugged. This Nighthawk fea-  
ture allows you (or heating contractor or fireman) to see exactly how  
big a CO problem you have so you can react accordingly. (More on  
the peak level memory feature on page 1-14).  
CO alarms will not work without power. This CO alarm requires a  
continuous supply of electric power.  
CO alarms can only sense CO that reaches the alarm’s sensor.  
Carbon monoxide may be present in other areas without reaching  
the alarm. The rate at which CO reaches the alarm may be affected  
by doors or other obstructions. In addition, fresh air from a vent or  
open window or any other source may prevent CO from reaching  
the sensor. Please observe cautions on page 1-5 “Where to install  
your CO alarm.”  
Vents  
Air (and CO) enters into the alarm at the bottom vent and  
circulates through the sensing chamber, exiting through the top vent.  
For proper air circulation, keep vents free of dust, dirt or grease, (see  
“How to care for your CO alarm” page 1-13). Do not obstruct or  
block vents, (see “Where to install your CO alarm” on page 1-5).  
CO could be present on one level of the home and not reach a CO  
alarm installed on a different level. For example, CO in the base-  
ment may not reach a CO alarm on the second level, near the bed-  
rooms. For this reason, we recommend you provide complete cover-  
age by placing a CO alarm on every level of the home.  
Sensor  
The sensor is a highly sensitive, electrochemical sensor that is CO-spe-  
cific to help avoid false alarms. Turn to page 1-13 for more informa-  
tion on how to care for and protect the CO alarm.  
CO alarms are not smoke alarms. CO alarms do not sense smoke or  
fire. For early warning of fire you must install smoke alarms, even  
though carbon monoxide can be generated by a fire.  
Sounder Alarm  
This is the loud 85 decibel pulsing alarm that will sound to alert you  
to a potential problem. Alarm condition is 4 quick beeps – followed  
by 5 seconds off – then 4 quick beeps, repeat. Caution: Continuous  
exposure to this sound level at close range over an extended period  
of time may cause hearing loss. We recommend you cover the sounder  
with your finger while testing. More on testing on pages 1-10,11.  
CO alarms should not be used to detect the presence of natural gas  
(methane), propane, butane, or other combustible fuels.  
CO alarms are not a substitute for property, disability, life or other  
insurance of any kind. Appropriate insurance coverage is your  
responsibility. Consult your insurance agent.  
Keyholes  
When the CO alarm is mounted to the wall, these keyholes slide onto  
the screws in the wall. (See “How to install your CO alarm on  
pages 1-7,8).  
 
1-3  
1-4  
Part One – Your Nighthawk CO Alarm  
Part One – Your Nighthawk CO Alarm  
If you must install a Nighthawk CO alarm near a cooking or heating  
Where to Install Your CO Alarm  
appliance, install AT LEAST 15 feet away from the appliance.  
Your Nighthawk CO alarm should be mounted in or near bedrooms  
and living areas. It is recommended that you install a Nighthawk CO  
alarm on each level of a multi-level home. You may use the number  
and location of smoke alarms installed in your home according to  
current building code requirements as a guide to the location of  
your Nighthawk CO alarm(s).  
Do not install in excessively dusty, dirty or greasy areas such as  
kitchens, garages and furnace rooms. Dust, grease or household  
chemicals can contaminate or coat the CO alarm’s sensor, causing the  
unit not to operate properly.  
Do not obstruct the vents located at the top and bottom of the CO  
alarm. Place the CO alarm where drapes, furniture or other objects  
do not block the flow of air to the vents.  
WHEN CHOOSING YOUR INSTALLATION LOCATIONS, MAKE  
SURE YOU CAN HEAR THE ALARM FROM ALL SLEEPING  
AREAS. IF YOU INSTALL ONLY ONE CARBON MONOXIDE  
ALARM IN YOUR HOME, INSTALL THE ALARM NEAR BED-  
ROOMS, NOT IN THE BASEMENT OR FURNACE ROOM.  
Do not install in dead air space, such as peaks of vaulted ceilings or  
gabled roofs, where carbon monoxide may not reach the sensor in  
time to provide early warning.  
TWO SELF ADHESIVE LABELS ARE INCLUDED WITH THE CO  
ALARM. ADD THE PHONE NUMBER OF YOUR EMERGENCY  
SERVICE PROVIDER IN THE SPACE PROVIDED. PLACE ONE  
LABEL NEXT TO THE ALARM AND ONE LABEL NEAR A FRESH  
AIR SOURCE SUCH AS A DOOR OR WINDOW.  
Do not install in turbulent air from ceiling fans. Do not install near  
doors and windows that open to the outside, near fresh air vents, or  
anywhere that is drafty. Rapid air circulation from fans or fresh air  
from outside may affect the unit’s alarm response time.  
Do not install this CO alarm in a switch- or dimmer-controlled outlet.  
CAUTION: This CO alarm will only indicate the presence of carbon  
monoxide at the sensor. Carbon monoxide may be present in other  
areas.  
Do not install in areas where the temperature is colder than 40˚F  
(4.4˚C) or hotter than 100˚F (37.8˚C). These areas include uncondi-  
tioned crawl spaces, attics, porches and garages. Extreme temperatures  
will affect the sensitivity of the alarm.  
IMPORTANT: Improper location can affect the sensitive electronic  
components in this CO alarm. Please see the next section describing  
where NOT to install this CO alarm.  
Do not install CO alarm near deep cell large batteries. Large batteries  
have emissions that can cause the CO alarm to perform at less than  
optimal performance.  
Where Not to Install Your CO Alarm  
To avoid causing damage to the CO alarm, to provide optimum  
protection, and to prevent unnecessary alarms, follow the direc-  
tions below where NOT to install this CO alarm:  
It is not recommended that you install this CO alarm in garages,  
kitchens or furnace rooms. Installation in these areas could lead to  
nuisance alarms, may expose the sensor to substances that could  
damage or contaminate it, or the alarm may not be heard by persons  
in other areas of the home, especially if they are sleeping.  
In the garage, vehicle exhaust can contain some carbon monoxide.  
These levels are higher when the engine is first started. CO levels in a  
garage may not be sufficient to activate the alarm immediately. Within  
hours of starting a vehicle and backing it out of the garage, the levels  
present over time can activate the alarm and become a nuisance.  
In the kitchen and furnace room, some gas appliances can emit a  
short burst of carbon monoxide upon startup. This is normal. If your  
CO alarm is mounted too close to these appliances, it may alarm  
often and become a nuisance.  
 
1-5  
1-6  
Part One – Your Nighthawk CO Alarm  
Part One – Your Nighthawk CO Alarm  
How to Install Your Alarm  
Power Cord Units (KN-COP-C)  
Direct Plug Unit (KN-COP-DP)  
First, refer to “Where to Install Your CO Alarm” on  
page 1-5 for general guidelines as to where to  
locate your CO alarm.  
First, refer to “Where to Install Your CO Alarm” on  
page 1-5 for general guidelines as to where to locate  
your CO alarm.  
To install:  
1. Choose a standard 120V outlet to plug alarm  
into.  
2. If outlet is mounted sideways (horizontally),  
rotate plug and simply plug in.  
Installation tips for power cord models:  
The power cord provides more flexibility in mount-  
ing locations and allows the CO 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 may not reach the sensor.  
Below is a list of suggested mounting locations if you wish to con-  
ceal the power cord:  
• Above a tall bureau, chest of drawers or bookcase  
• Above a doorway or closet, securing the cord to the side of  
the molding  
• Near a curtain, with the cord behind the curtain.  
Note: Do not cover the alarm itself with the curtain. See additional  
cautions on 1-6. Note: Plastic casing available in most hardware  
stores in an inexpensive way to secure and cover the power cord.  
CAUTION: Do not rotate unit while plugged in, as damage to plug  
may result.  
Hardwire Unit (KN-COP-HW)  
First, refer to “Where to Install Your CO Alarm” on page 1-5 for general  
guidelines as to where to locate your CO alarm.  
To install:  
Double-Screw Mount with Mounting Plate  
(for standard hardwire mount) –  
1. Warning: All electrical installation, including  
wiring should be performed by a qualified  
licensed technician.  
To install:  
2. Turn off main power to circuit.  
Single-Screw Mount (for standard wall mount)–  
WALL  
3. Screw mounting plate to standard outlet box using the screws  
provided. Do not warp mounting plate by over tightening screws.  
1. Insert the screw provided until head is approx  
1/8” from wall (If mounting in plaster board or  
drywall, drill 3/16 hole and use plastic anchor  
provided).  
4. Strip wire ends approximately 5/16”. Using wire nuts provided,  
attach wires from the unit to the 120V AC power source  
(18 AWG minimum): white to white, black to black.  
2. Hook the Nighthawk CO Alarm unit over the  
screw onto keyhole in back of unit.  
5. Feed excess wires back into outlet box.  
1/8"  
6. Hook the unit on the 2 mounting studs in keyholes on back of unit.  
7. Turn on the main power current.  
3. Plug cord into electrical outlet.  
Minimum 6"  
from ceiling  
M ounting  
Plate  
Blac k  
W ires  
(provided)  
(hot)  
Standard  
Outlet Box  
(not provided)  
Reminder:  
If you are mounting alarm  
high on a wall, make sure  
it is at least 6" from ceil-  
ing. Any higher and it will  
be in “dead air” space.  
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N ig hthaw k  
CO Alarm  
W ires  
(neutral)  
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W ire N uts  
(provided)  
Note: KIDDE Safety does not recommend mounting alarm on  
M ounting  
Sc rew s  
(provided)  
ceiling as we have not tested our alarms for this type application.  
 
1-7  
1-8  
Part One Your Nighthawk CO Alarm  
Part One Your Nighthawk CO Alarm  
Normal Operating Characteristics  
How to Test Your Alarm  
When you first power up the CO alarm, the alarm will sound  
briefly to let you know the CO alarm is receiving power and that the  
alarm circuit is functioning.  
There are two aspects of the CO alarm’s operation that can be tested:  
the electronics and the sensor response. Instructions on testing each  
are outlined below and on the next page.  
You should see three eights  
on the digital display, indicating  
Testing the Electronics  
the CO 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 CO  
alarm is operating. See illustration below.  
You should test the alarm once a week, following the directions  
listed below. If at any time you test the alarm and it does not per-  
form as described below, have it replaced immediately. Turn to page  
1-12 “How to know if your CO alarm is malfunctioning” for a  
description of the characteristics of a malfunctioning alarm and what  
you should do if a malfunction occurs.  
Within 20 seconds, your CO alarm will start monitoring for CO, then  
the first reading will appear on the digital display. The number indi-  
cates a measurement of carbon monoxide in parts per million (ppm).  
Note: The number will probably be zero (0). This is a normal condi-  
tion for most households and shows that no measurable amount of  
CO has been detected.  
Observe the CO alarm weekly to  
make sure the red dot is blinking,  
indicating normal operation.  
Blinking  
Dot  
PPM of CO  
If the dot is not blinking, unplug the  
The CO alarm has begun monitoring the air for carbon monoxide  
and will continue to do so as long as it receives power.  
alarm for three minutes, then plug in again. This will clear the CO  
alarm for restart. If the dot does not resume blinking, your CO alarm  
may be malfunctioning.  
For more information about CO readings and the effects of CO expo-  
sure at different levels over time, refer to the chart on 3-2 as well as  
the information on pages 4-1,2,3.  
To test the CO alarm, press the Test/Reset button. If the alarm is  
operating properly, you should notice the following:  
When the CO alarm is unplugged or loses power, a  
fading alarm will sound briefly to alert you that it has been  
disconnected from its power source. For example, this fading alarm  
will sound in the event of a power outage. A brief alarm will also  
sound to alert you when the power is restored.  
• 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.  
For directions on how to test your alarm, see next column.  
For information about how the unit alarms, turn to page 5-2.  
For information about alarm’s malfunction alert, turn to page 1-12.  
Familiarize yourself and household members with the alarm pattern  
described above. In the event of a CO incident, this pattern will con-  
tinue to repeat as long as CO is present.  
Three Eights  
TEST-  
RESET  
PPM of CO  
Move to Fresh Air  
Blinking  
Dot  
C
ARBON  
ONOXIDE  
LARM  
M
PEAK  
LEVEL  
A
 
1-9  
1-10  
Part One Your Nighthawk CO Alarm  
Part One Your Nighthawk CO Alarm  
How to Test Your Alarm (continued)  
How to Know If Your Alarm is Malfunctioning  
Your CO alarm performs an internal self-diagnosis every 15 seconds  
to make sure that it is functioning properly. The CO alarm is  
designed to alert you in the unusual event of a malfunction.  
NOTE: Pressing the Test/Reset button tests the functions of the alarm’s  
internal components, circuitry and micro-computer. YOU DO NOT  
NEED TO PRESS THE TEST BUTTON TO TAKE A CO READING.  
CO readings are automatically shown on the CO alarm’s digital dis-  
play. If the alarm shows zero (0), then no measurable amount of CO  
has been sensed by the CO alarm within the past 15 seconds.  
If the CO alarm malfunctions.  
In the rare event that your CO alarm malfunctions, it will alert you  
with one of these signal groups (depending upon the type of mal-  
function that occurs):  
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. The best and safest way to do this is with either a  
cigarette or an incense stick. To perform this test you will need: your  
CO alarm (that has been powered up for at least two hours), matches  
or a butane lighter, an ashtray, and either a cigarette or an incense  
stick.  
Malfunction Signal Group 1 - Component Failure  
– An intermittent “chirping” alarm will sound every 30  
seconds, and  
– An “Err” message will appear on the digital display  
OR,  
Malfunction Signal Group 2 - Microprocessor Failure  
– The alarm will sound continuously, and  
– The digital display will be blank, and  
– The alarm cannot be shut off by pushing the  
“Test/Reset” button  
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 cau-  
tion when performing the test described below. Avoid burns from  
flame or hot materials. Avoid inhaling excessive smoke from the ciga-  
rette 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.  
Unplug the CO alarm immediately and return for warranty exchange  
(see “Limited Warranty” on back two pages).  
What to do if youre not sure...  
PLEASE familiarize yourself with the malfunction alert, and do not  
confuse these signals with an alarm. After reading the information  
above, if you are still unsure whether your CO alarm is operating  
properly, call the KIDDE Safety toll-free consumer hotline at 800-880-  
6788 to do a quick diagnostic check of the CO alarm over the phone.  
The customer service representative will be able to assist you and  
answer your questions.  
Step 2. Hold the smoldering cigarette or incense stick 12 - 15 inches  
directly below the bottom air vents of the CO alarm, making sure the  
stream of smoke rises into the vents.  
Step 3. Continue holding the cigarette or incense stick directly below  
the CO alarm for 3 - 5 minutes, or until you notice a reading on the  
display. This time is needed as the CO alarm samples the air every 15  
seconds. Note: Do not hold the cigarette or incense stick closer than  
12 inches to the CO alarm as smoke will cause a yellow stain to devel-  
op on the CO alarm’s outer case.  
If your alarm sounder is beeping, and you are not sure if it is a CO  
alarm or a malfunction alert, reset the alarm, open windows for venti-  
lation, turn off fuel-burning appliances (like kerosene or oil heaters,  
furnaces, gas ranges, wood-burning stoves, water heaters, or other  
fossil-fuel burning appliances). For furnaces, you can simply turn  
down the thermostat to its lowest setting. Open windows and doors  
for ventilation. Then call the KIDDE Safety toll-free consumer hotline  
at 800-880-6788 for assistance.  
Step 4. If your unit alarms, you can silence it by pressing the  
Test/Reset button and removing the source of CO.  
Step 5. Extinguish the cigarette or incense stick by pressing the smol-  
dering tip into the ashtray.  
Before you call a qualified technician (such as a licensed heating con-  
tractor, utility service technician, chimney sweep or fuel provider) to  
check your residence for CO, remember that you will probably be  
charged for a service call. KIDDE Safety customer service operators  
are available to answer your questions and assist you in non-emer-  
gency situations at no charge.  
 
1-11  
1-12  
Part One Your Nighthawk CO Alarm  
Part One Your Nighthawk CO Alarm  
How to Know If Your Alarm is Malfunctioning (cont.)  
Never ignore a CO alarm. A true alarm is an indication of potentially  
dangerous levels of carbon monoxide. CO alarms are designed to  
alert you to the presence of carbon monoxide before an emergency,  
before most people would experience symptoms of carbon monoxide  
poisoning, giving you time to resolve the problem calmly.  
The Peak Level Memory Button  
Although the peak level feature will display levels below 30 PPM, these levels  
will not result in an alarm no matter how long the device is exposed to these  
levels.  
The peak level feature is helpful in indentifying low level CO occurrences  
below 30 PPM. Although the unit will not automatically display levels below  
30 PPM, it will detect and store these readings in memory. By pressing the  
peak level button, concentration levels as low as 11 and up to 999 PPM will  
be displayed.  
How to Care for Your Alarm  
To keep your CO alarm in good working order, you must follow  
these simple steps:  
Concentrations of CO between 0 and 30 PPM can often occur in normal,  
everyday conditions. Concentrations of CO below 30 PPM may be an indica-  
tion of a transient condition that may appear today and never reappear. Just a  
few examples of conditions and/or sources that may cause low level readings  
are heavy automobile traffic, a running vehicle in an attached garage, an appli-  
ance that emits CO when starting up, a fire in a fireplace or charcoal in a  
nearby barbecue. A temperature inversion can trap CO generated by traffic  
and other fuel burning appliances causing low level readings of CO.  
WHAT YOU SHOULD DO:  
•Test the alarm once a week by pressing the Test/Reset button  
Vacuum the alarm cover once a month to remove accumulated  
dust. Use the soft brush attachment of your vacuum cleaner, and  
unplug the alarm from the electrical outlet before vacuuming.  
•Instruct children never to touch, unplug or otherwise interfere  
with the unit. Warn children of the dangers of CO poisoning.  
Normally, the digital display will read “0” and under certain conditions you  
may notice levels of 30 or more for short periods of time, by using the peak  
level memory feature on the Nighthawk CO alarm you can view concentra-  
tions of CO between 11 and 30 PPM. Use the low-level concentrations shown  
in memory as a tool in identifying the source of the CO. It may be helpful to  
purchase additional Nighthawk CO Alarms to place in different locations  
throughout your house to isolate the CO source. Monitor the CO concentra-  
tions shown in the peak level memory to see if readings occur in certain areas  
at certain times of the day, or near a particular appliance.  
WHAT YOU SHOULD NOT DO:  
•Never use detergents or solvents to clean the alarm. Chemicals  
can permanently damage or temporarily contaminate the sensor.  
Avoid spraying air fresheners, hair spray, paint or other aerosols  
near the CO alarm.  
•Do not paint the CO alarm. Paint will seal the vents and interfere  
with proper sensor operation.  
•Do not mount the CO alarm directly above or near a diaper pail,  
as high amounts of methane gas can cause temporary readings  
on the digital display.  
Note: If you will be staining or stripping wood floors or furniture,  
painting, wall-papering, or using aerosols or adhesives for a do-it-your-  
self project or hobby, before you begin: Remove the CO alarm to a  
remote location to prevent possible damage to or contamination  
of the sensor. You may wish to unplug the CO alarm and store in a  
plastic bag during the project.  
The following is a list of substances that at high levels can affect the  
sensor and cause temporary readings on the digital display that are not  
carbon monoxide readings:  
Methane, propane, iso-butane, ethylene, ethanol, alcohol,  
iso-propanol, benzene, toluene, ethyl acetate, hydrogen, hydro-  
gen sulfide, sulfur dioxides.  
Also most aerosol sprays, alcohol based products, paints, thin-  
ners, solvents, adhesives, hair sprays, after shaves, perfumes,  
auto exhaust (cold start) and some cleaning agents.  
Once the source is located, correcting the problem may be as easy as opening  
a window, venting an appliance, backing a car out of the garage a safe dis-  
tance from living quarters, closing the garage door, and letting the car warm up  
outside. It could be possible that a weather condition caused the low-level  
reading and the condition may or may not happen again.  
Some CO conditions may start out as low level leaks but could develop into  
CO concentrations that could become harmful. If this happens, the CO alarm  
will detect the dangerous level and alarm, notifying you and others of the  
conditions. DO NOT ignore high concentration readings above 30 PPM or a  
CO alarming device that is in alarm. Refer to page 4-2 for more details.  
CO concentrations displayed below 30 PPM in memory are for reference only  
and the accuracy of the concentration shown may not be as accurate as noted  
on page 5-2.  
To Reset the Peak Level Memory…  
Step 1. Press the peak level button.  
Step 2. With the peak level button still pressed, press the test/reset button as well.  
The number on the display will turn to “0”. The memory has now been cleared  
and the alarm will begin monitoring for CO within 20 seconds.  
 
1-13  
1-14  
Part Two Carbon Monoxide -  
The Silent Killer  
Part Two Carbon Monoxide -  
The Silent Killer  
A by-product of combustion, carbon monoxide can be a potential  
problem from a number of common sources – automobiles,  
furnaces, water heaters, fireplaces, wood stoves, charcoal grills, gas  
ranges, space heaters and portable generators.  
What is Carbon Monoxide?  
Carbon monoxide (CO) is an odorless, colorless, poisonous gas creat-  
ed when any fuel is burned – gasoline, propane, natural gas, oil,  
wood, coal, and even tobacco. When combustion air is limited, more  
CO is produced. Serious problems can develop when combustion  
by-products are not properly vented outside the house.  
When these appliances are in good working condition with proper  
ventilation, lethal carbon monoxide gas is vented outdoors where it  
quickly disperses. But even the slightest malfunction or misuse of any  
of these sources can lead to a build-up of carbon monoxide in your  
home that can become deadly before you’d even know it’s there.  
You’ve probably heard about carbon monoxide poisoning in the  
news recently. It’s a problem receiving more attention because  
groups like the American Lung Association and the Consumer  
Product Safety Commission have made it a priority to warn the pub-  
lic about the dangers of this deadly household poison.  
And you don’t have to have ancient appliances to have a problem.  
Today’s more energy-efficient, airtight home designs can trap CO-pol-  
luted air inside where it can quickly build to lethal levels.  
What are the Effects of CO Exposure?  
When you breathe carbon monoxide, it enters your bloodstream  
through your lungs and attaches to red blood cells. These red blood  
cells, called hemoglobin, carry oxygen throughout your body. Carbon  
monoxide molecules attach to the red blood cells 200 times faster  
than oxygen, preventing the flow of oxygen to your heart, brain and  
vital organs. As carbon monoxide accumulates in your bloodstream,  
your body becomes starved for oxygen. The amount of carbon  
monoxide in a person’s body can be measured by a simple blood  
test, called a “carboxyhemoglobin level” test.  
What Can You do to Protect Your Family?  
To be safe, know the possible sources of CO in your home. Keep  
fuel-burning appliances and their chimneys and vents in good work-  
ing condition. Learn the early symptoms of exposure, and if you sus-  
pect carbon monoxide poisoning, move outside to fresh air and get  
emergency help. A blood test can confirm that CO caused the prob-  
lem.  
Your first line of defense is an annual inspection and regular mainte-  
nance of your appliances. Contact a licensed contractor or call your  
local utility company for assistance.  
The early symptoms of carbon monoxide poisoning are often mistak-  
en for the flu – headache, dizziness, weakness, nausea, vomiting,  
sleepiness, and confusion.  
But remember, problems can begin after an inspection is over, like a  
crack in a furnace heat exchanger, or a leak in a water heater vent or  
a bird’s nest blocking a flue. Other sources are nearly impossible to  
detect: even a change in the air pressure outside can turn a normally  
safe situation deadly. That’s why you need the 24-hour protection  
provided by a CO alarm.  
Breathing very high concentrations of carbon monoxide can be lethal  
in minutes. Breathing low concentrations over time is dangerous, too.  
Long term exposure to low levels could cause permanent heart and  
brain damage.  
Could Your Family be at Risk for CO Poisoning?  
Carbon monoxide is the number one cause of poisoning deaths in  
the United States. According to the Mayo Clinic, at least 10,000  
Americans are affected by CO poisoning each year.  
While anyone is susceptible, experts agree that unborn babies, small  
children, senior citizens and people with heart or respiratory prob-  
lems are especially vulnerable to CO and are at the greatest risk for  
death or serious injury.  
Where Does CO Come From?  
Inside your home, appliances used for heating and cooking are the  
most likely sources of carbon monoxide. Vehicles running in attached  
garages can also produce dangerous levels of carbon monoxide.  
 
2-1  
2-2  
Part Two Carbon Monoxide -  
The Silent Killer  
Part Two Carbon Monoxide -  
The Silent Killer  
Home Safety Tips  
What You Should Not Do...  
•Never burn charcoal inside a home, garage, cabin, RV or camper.  
What You Can Do...  
•Buy only appliances approved by a nationally recognized  
testing laboratory.  
•Never install, service, or convert fuel-burning appliances from  
one type to another without proper knowledge, skills and tools.  
•Never use a gas range, oven, or clothes dryer for heating.  
•Choose fuel-burning appliances that can be vented to the  
outdoors, whenever possible.  
•Never operate unvented gas-burning appliances, such as  
kerosene or natural gas space heaters, in a closed room.  
•Make sure appliances are installed according to manufacturer’s  
instructions and local building codes. Most appliances should  
be installed by professionals and should be inspected by the  
proper authority after installation.  
•Never operate gasoline-powered engines (like vehicles,  
motorcycles, lawn mowers, yard equipment or power tools)  
in confined areas such as garages or basements, even if an  
outside door or window is open.  
•Have the heating system, vents, chimney and flue inspected  
and cleaned by a qualified technician every year.  
•Never ignore a safety device when it shuts off an appliance.  
•Never ignore a CO alarm.  
•Follow manufacturer’s directions for safe operation of all  
fuel-burning appliances.  
Be Aware of the Warning Signs of Carbon  
Monoxide: Clues You Can See...  
•Streaks of carbon or soot around the service door of your  
fuel-burning appliances.  
•Examine vents and chimneys regularly for improper connections,  
visible rust or stains.  
•Open a window when a fireplace or wood-burning stove is in  
use, and provide adequate outdoor air for furnace and water  
heater.  
•A yellow or orange flame may indicate a problem with natural  
gas appliances.  
•Notice problems that could indicate improper appliance  
operation:  
– Decreasing hot water supply  
•Excessive rusting on flue pipes or appliance jackets.  
•Loose or missing furnace panel.  
– Furnace unable to heat house or runs constantly  
– Sooting, especially on appliances  
– Unfamiliar or burning odor  
•Moisture collecting on the windows and walls of furnace rooms.  
•Loose or disconnected vent/chimney, fireplace or appliance.  
Yellow or orange flame  
•Small amounts of water leaking from the base of the chimney,  
vent or flue pipe.  
•Be aware of the symptoms of carbon monoxide poisoning:  
– headaches, dizziness, weakness, sleepiness, nausea, vomiting,  
confusion and disorientation.  
•Rust on the portion of the vent pipe visible from outside your  
home.  
•Recognize that CO poisoning may be the cause when family  
members suffer from flu-like symptoms that don’t disappear  
but improve when they leave home or extended periods of  
time.  
•The absence of a draft in your chimney (indicating blockage).  
•Fallen soot from the fireplace chimney.  
•Loose, damaged or discolored bricks on your chimney.  
•Install a UL 2034 Listed CO alarm for added safety.  
– The Consumer Product Safety Commission recommends  
that every residence with fuel-burning appliances be  
equipped with a UL Listed CO alarm.  
Clues You Cannot See...  
•Internal appliance damage or malfunctioning components  
•Improper burner adjustment  
•Hidden blockage or damage in chimneys  
 
2-3  
2-4  
Part Three What You Should Know  
Before the Alarms Sounds  
Part Three What You Should Know  
Before the Alarms Sounds  
If anyone in the household is at high risk for CO poisoning, we urge you  
to take extra precaution to prevent possible poisoning. If the unit alarms  
or if CO readings are shown on the digital display, remove the at-risk  
person from the premises, if possible. Ventilate the area. The high-risk  
person(s) should not re-enter the residence until the source of the CO  
problem has been identified and corrected.  
Learn the difference between dangerous levels,  
high levels, mid levels and low levels:  
Dangerous levels, when someone is experiencing symptoms of  
CO poisoning and CO readings are generally above 100 ppm.  
Anytime someone is experiencing the symptoms of carbon monoxide  
poisoning this should be treated as an EMERGENCY. Follow the instruc-  
tions on page 4-2.  
High levels, generally above 100 ppm, with no one experiencing  
symptoms. This should be treated as an URGENT situation. Follow the  
instructions on page 4-2.  
Understand the Effects of Carbon Monoxide Exposure  
Concentration  
of CO in Air  
Approximate Inhalation Time  
and Symptoms Developed  
(ppm = parts  
per million)  
Mid levels, generally between 50 ppm to 100 ppm. This should be  
cause for CONCERN and should not be ignored or dismissed. Follow  
the instructions on page 4-2.  
50 ppm  
The maximum allowable concentration for con-  
tinuous exposure for healthy adults in any  
8-hour period, according to OSHA*.  
Low levels, generally below 50 ppm. This indicates a need to watch  
the situation closely to see if it resolves itself or worsens. Follow the  
instructions on page 4-3.  
200 ppm  
400 ppm  
800 ppm  
Slight headache, fatigue, dizziness, nausea  
after 2-3 hours.  
Frontal headaches within 1-2 hours, life threat-  
ening after 3 hours.  
Dizziness, nausea and convulsions within 45  
minutes. Unconsciousness within 2 hours. Death  
within 2-3 hours.  
Determine if anyone in the household is at high risk  
for CO poisoning:  
Many cases of reported carbon monoxide poisoning indicate that while  
victims are aware they are not well, they become so disoriented they are  
unable to save themselves by either exiting the building or calling for  
assistance.  
1,600 ppm  
3,200 ppm  
6,400 ppm  
12,800 ppm  
Headache, dizziness and nausea within 20 min-  
utes. Death within 1 hour.  
Headache, dizziness and nausea within 5-10  
minutes. Death within 25-30 minutes.  
Headache, dizziness and nausea within 1-2 min-  
utes. Death within 10-15 minutes.  
Death within 1-3 minutes.  
You should take extra precautions to protect high risk persons from  
CO exposure because they may experience ill effects from carbon monox-  
ide at levels that would not ordinarily affect a healthy adult. Are there any  
infants or small children in the home? Be sure to check them for signs of  
possible CO poisoning because they might have trouble explaining their  
symptoms. Infants and children are more susceptible to CO poisoning  
than a healthy adult.  
* Occupational Safety and Health Administration  
Pregnant women should be aware that their unborn fetus could be  
harmed by exposure to carbon monoxide, even when the mother suffers  
no ill effect herself. Any pregnant woman who suspects she may have  
been exposed to carbon monoxide should immediately contact her  
physician.  
Low Levels:  
Mid Levels:  
Generally 50 ppm and below.  
Generally 50 ppm to 100 ppm.  
High Levels:  
Dangerous Levels:  
Generally 100 ppm and above  
if no one is experiencing  
symptoms.  
Generally 100 ppm and above if  
someone is experiencing symptoms.  
Is there anyone in the household who is elderly, or who has anemia,  
heart disease or respiratory problems, emphysema or chronic bronchitis?  
These individuals are at higher risk for CO poisoning and for health  
problems from exposure to low levels of carbon monoxide.  
Reminder: The chart above relates to the exposure of healthy adults.  
Read the info on the previous page for descriptions of those who are at  
higher risk.  
 
3-1  
3-2  
Part Four What to do When the  
Alarm Sounds  
Part Four What to do When the  
Alarm Sounds  
Determine if anyone in the household is experiencing symptoms of  
CO poisoning. Many cases of reported CO poisoning indicates that  
while victims are aware they are not well, they become so disorient-  
ed that they are unable to save themselves by either exiting the  
building or calling for assistance. Also young children and household  
pets may be the first affected. The following symptoms are related to  
CARBON MONOXIDE POISONING and should be discussed with  
ALL members of the household:  
WARNING: Actuation of your CO  
Alarm indicates the presence of Carbon  
!
Monoxide (CO) which can KILL YOU.  
L
When the CO alarm senses a dangerous level of CO, the  
unit will emit a loud alarm pattern. The alarm pattern is 4 short  
beeps – followed by 5 seconds of silence – followed by 4 short  
beeps. Know how to respond to a CO emergency. Periodically  
review this user’s guide and discuss with all members of your  
family.  
Common Mild Exposure Symptoms:  
Slight headache, nausea, vomiting, fatigue (“flu-like” symptoms).  
Common Medium Exposure Symptoms:  
Throbbing headache, drowsiness, confusion, fast heart rate.  
WARNING! - Actuation of this device  
indicates the presence of dangerous levels of  
carbon monoxide!  
Common Extreme Exposure Symptoms:  
Convulsions, unconsciousness, heart and lung failure.  
It can cause brain damage and death.  
Carbon monoxide can be fatal! If the alarm sounds:  
1) Operate test/reset button;  
Become familiar with these common symptoms  
from CO poisoning.  
PHONE NUMBER  
2) Call your emergency  
services (fire dept. or 911);  
If you experience even mild symptoms of CO poisoning,  
consult your doctor immediately!  
3) Immediately move to fresh  
air - outdoors or by an open door/window. Do a head count to  
check that all persons are accounted for. Do not reenter the  
premises nor move away from the open door/window until the  
emergency services responders have arrived, the premises have  
been aired out, and your alarm remains in its normal condition.  
4) After following steps 1-3, if your alarm reactivates within a 24  
hour period, repeat steps 1-3 and call a qualified technician  
to investigate for sources  
of CO from fuel burning  
equipment and appliances,  
PHONE NUMBER  
and inspect for proper operation of this equipment. If problems  
are identified during this inspection have the equipment serviced  
immediately. Note any combustion equipment not inspected by  
the technician and consult the manufacturer’s instructions, or  
contact the manufacturer’s directly, for more information about  
CO safety and this equipment. Make sure that motor vehicles are  
not, and have not been, operating in an attached garage or adja-  
cent to the residence.  
 
4-1  
4-2  
Part Four What to do When the Alarm Sounds  
Part Four What to do When the Alarm Sounds  
LOW LEVEL READING,  
UNIT WILL NOT ALARM  
Calling a Qualified Technician to Find and Repair the  
Problem  
If you call a qualified service technician (such as a licensed heating con-  
tractor, utility service technician, chimney sweep or fuel provider) to  
inspect your home for possible sources of CO, tell the technician what the  
digital readings were and have them press the peak level memory button.  
This way they can see how big a problem they are dealing with. Do not  
restart these appliances until the problem is corrected. Request service for  
as soon as possible, like TODAY.  
Unit reads below 50 ppm of carbon monoxide.  
Remember to determine if anyone is at high risk for CO poisoning. If so,  
you should use precaution not to expose the at-risk person to low levels  
for more than eight hours.  
If no one is experiencing symptoms of carbon monoxide poisoning, press the  
reset button on the CO alarm. Otherwise refer to Dangerous and/or High Level  
Alarms on page 4-1,2. Under normal operation the CO alarm will not display CO  
concentrations detected between 11 and 29 ppm. By pressing the peak level but-  
ton, you can see if any CO concentration from 11 to 999 has been detected  
including low levels of 11 to 29 ppm.  
Please be aware that some service technicians may charge a fee to inspect  
your home, even if the source of CO is not found. You may wish to find  
out if you will be charged for the service and the amount of the fee before  
you request service. Some public utilities do not charge for inspection.  
Some service technicians do not charge if you purchased your appliance  
from them. To know for sure, you need to ask before the technician  
comes to your home. Repair work or replacement of appliances may be  
necessary to fix the problem that is creating the CO in your home.  
Remember, a CO alarm can only warn you of the presence of CO, it does  
not prevent CO from occurring, nor can it solve an existing CO  
problem.  
Then, consider whether the following could be sources of the low CO levels:  
•Cigarette smoke? Gas oven or range? Attached garage?  
Fuel-burning appliances?  
•Has anyone used chemicals that could affect the sensor?  
(See page 1-13 or a list of chemicals that can have a temporary or  
permanent affect on the sensor.)  
•Has there been a temperature inversion in the area?  
•Do you live in an area with air pollution or heavy traffic?  
Test the alarm to verify that it is working properly, following the instructions on  
page 1-10,11.  
Because you’ve provided ventilation by leaving your windows and doors  
open, the CO buildup may have dissipated by the time help responds.  
Although your problem may appear to be temporarily solved, it’s crucial  
that the source of the CO is determined and appropriate repairs are made.  
If the CO alarm appears to be functioning properly, ventilate your home and turn  
fuel-burning appliances to the “off” position until the digital display returns to “0.”  
Then, turn appliances back on and take note of any further readings at one hour  
intervals. Note if the turning on of appliances has caused any change in CO  
alarm readings.  
Sometimes it’s Difficult to Find the Source of  
CO in a Home  
It can be difficult for responders to locate the source(s) of CO if:  
Sometimes conditions may develop that are not caused by malfunctioning appli-  
ances or structural problems that need to be repaired. These conditions can cre-  
ate a temporary build-up of low CO levels that will dissipate and may not return.  
(For example: weather conditions or backdrafts caused by differences in air pres-  
sure between the inside and outside of the home). This is why we suggest you  
ventilate the home and then monitor to see if any CO levels reappear.  
The house was ventilated before they arrived and the fresh air  
caused the CO to dissipate. The peak level function on your  
Nighthawk CO alarm helps the responders know how severe  
the problem was before they arrived.  
The CO problem was caused by a source that fluctuates on and  
off, sometimes creating CO and sometimes not. Such a situation  
makes it nearly impossible to pinpoint the source of CO in a short  
period of time.  
Treatment for CO Poisoning  
Any person who is suspected to have carbon monoxide poisoning should leave  
the potentially dangerous environment, get fresh air immediately and seek care  
from a physician. CO poisoning can be determined by a simple blood test,  
called a “carboxyhemoglobin” test. This test measures the amount of carbon  
monoxide in the bloodstream. For this test to be accurate, it must be done  
immediately after CO exposure. Acute CO poisoning is usually treated by  
breathing in oxygen. When CO poisoning is severe, (for example, when there is  
an altered state of consciousness), high pressure oxygen therapy in a special  
“hyperbaric chamber” may be used. A physician will make this determination  
and administer treatment if necessary.  
The cause of CO problem was backdrafting – when air in a  
chimney or flue is sucked into the home instead of venting  
outside. The exact situation that created a negative air pressure  
inside the home (the cause of backdrafting) is difficult to recreate  
during an investigation for CO. Sometimes the CO problem  
disappears when a door or window is opened. Backdrafting  
may or may not happen again.  
 
4-3  
4-4  
Part Five Technical Information  
Part Five Technical Information  
How the Unit Determines When to Alarm  
Your Nighthawk CO alarm uses advanced technology to monitor the  
environment in your home and warn you of unacceptable levels of  
carbon monoxide. An internal microcomputer works together with  
the carbon monoxide sensor inside the CO alarm to determine the  
levels of carbon monoxide in the air and to calculate the rate that CO  
would be absorbed into the human body.  
Power:  
120V AC units: 60 Hz, Current 60 mA max.  
Sensor calibrated at 150 ppm ( 25 ppm).  
Sensor:  
Temperature:  
Operating range: 40˚F (4.4˚C) to 100˚F (37.8˚C).  
Mounting:  
Power Cord: #8 Philips panhead screw with plastic anchor.  
Hardwire: 2, #8 Philips panhead screws with mounting plate.  
Direct Plug-In: No mounting screws needed.  
The microcomputer is calibrated to trigger the unit’s alarm before  
most people would experience any symptoms of carbon monoxide  
poisoning. Because carbon monoxide is a cumulative poison, long-  
term exposures to low levels can cause symptoms, as well as short-  
term exposures to high levels. Your Nighthawk CO alarm has a time  
weighted alarm, so the higher the level of carbon monoxide pre-  
sent, the sooner the alarm will be triggered.  
Alarm:  
85+ dB at 10’ @ 3.4 0.5 KHz pulsing alarm. In alarm  
condition you will hear 4 quick beeps, 5seconds off, 4 quick  
beeps, repeat.  
LED Operation:  
Blinking dot denotes normal operation.  
Digital readout 30-999.  
This Nighthawk CO alarm meets the alarm response time  
requirements of UL Standard 2034 which are as follows:  
Unit Malfunction:  
“Err” error message will display. Intermittent alarm will  
At 70 ppm, the unit must alarm within 60-240 minutes.  
At 150 ppm, the unit must alarm within 10-50 minutes.  
At 400 ppm, the unit must alarm within 4-15 minutes.  
sound every 30 seconds and display dot will stop blinking.  
Refer to page 1-12 for other “Err” conditions.  
Test/Reset Button:  
Test button verifies proper unit operation and resets the  
unit in the event of a CO alarm.  
WARNING: This device may not alarm at low carbon monoxide levels  
(see chart above for alarm points). This product is intended for use in  
ordinary indoor locations of family living units. It is not designed to  
measure compliance with Occupational Safety and Health  
Administration (OSHA) commercial or industrial standards. Individuals  
with medical problems may consider using warning devices which pro-  
vide audible and visual signals for carbon monoxide concentrations  
under 30 ppm.  
Peak Level Memory Button:  
When pressed, LED will display the highest CO ppm level  
detected since unit was powered up or since unit was reset  
with test button. Reading will be stored in memory as long  
as unit is not reset or unplugged. Any concentration detected  
from 0-999 will be displayed.  
Size:  
5.6”L x 3.2”W x 2.0”H. Wt. 1.1 lbs.  
Accuracy of the Digital Display  
Housing:  
Warranty:  
Rigid plastic case meets UL94-5V rating.  
Each Nighthawk CO Alarm is calibrated at a CO concentration of 150  
ppm (+/- 25 ppm) in air, at 80˚ F (+/- 10˚ F) and 40% (+/- 3%) relative  
humidity. Depending on the ambient condition (temperature, humidity)  
and the condition of the sensor, the alarm readings may vary.  
Five-year warranty from date of purchase against defects in  
material and workmanship.  
The digital reading tolerances are:  
Ambient: 80˚ F (+/- 10˚ F), atmospheric pressure +/- 10%, 40% +/- 3%  
relative humidity.  
Tolerance  
(of displayed reading)  
Reading  
0-999 ppm  
20% + 15 ppm  
 
5-1  
5-2  
Part Six Frequently Asked Questions  
Part Six Frequently Asked Questions  
Q. How many alarms do I need in my house? How much  
square footage will one CO alarm cover?  
Q. How do I get the CO alarm to show something besides “0.”  
OR, How can I determine if the sensor is operating correctly?  
A. Please refer to “Testing Sensor Response” on page 1-10,11 for  
complete instructions on how to test your CO alarm’s electronics and  
sensor functions.  
A. We recommend you place alarms near the sleeping area(s). If  
you have a multi-level home, you should place an alarm on each  
level of the home. A good rule of thumb for the number and place-  
ment of CO alarms for your particular home is to place CO alarms  
near smoke alarms that have been installed to meet current building  
code requirements.  
Q. You warranty the alarm for five years. How will I know  
when it doesn’t work anymore and I need to buy a new one?  
A. In any event of malfunction, your CO alarm should alert you with  
malfunction signals. These signals are described in detail on page 1-12.  
Generally, one CO alarm can be adequate for 1,200 to 1,500 square  
feet of living space. The most important determination for the num-  
ber of alarms needed is whether an alarm can be heard in all sleep-  
ing areas.  
Q. What do the numbers mean on the digital display when I  
press the “Test/Reset” button?  
A. The numbers you see when you press the Test/Reset button are  
NOT a CO reading. This is a simulated reading the alarm displays as it  
tests its electronics. The numbers displayed when the Test/Reset button  
is pushed should be between 100 to 350.  
Q. Can you explain what “time-weighted alarm” means?  
A. Because carbon monoxide is a cumulative poison, two factors  
determine how the body is affected by CO: the level of exposure  
and the length of exposure. For example, being continuously  
exposed to low levels of carbon monoxide for many hours can be  
as dangerous as being exposed to higher levels of CO for a short  
period of time.  
Q. I called in someone to inspect my home for CO after my unit  
alarmed, and he couldn’t find anything wrong. Why? Does that  
mean this CO alarm “false alarmed”?  
A. No. Please read the information explaining why a CO problem can  
be difficult to diagnose on page 4-4. Also, please read the information  
on page 1-12 to make sure you experienced an alarm and not a mal-  
function alert.  
The microchip inside your Nighthawk CO alarm monitors the air for  
the presence of carbon monoxide and computes the levels and  
length of exposure, alarming when you should be concerned about  
CO exposure.  
For more information about the alarm, see page 5-2.  
Q. I tried to test the CO alarm (see below) and it still reads “0.”  
Why?  
Q. Do I have to press the test button to get a CO reading?  
A. No. Your Nighthawk CO alarm continuously monitors the air for  
carbon monoxide. An updated reading is shown on the digital dis-  
play every 15 seconds. If there is no CO present, the digital display  
will show a zero. The CO alarm will alert you to the presence of CO  
automatically. To test the internal components and circuitry of your  
CO alarm, press the Test/Reset button. For complete instructions on  
testing your CO alarm, see pages 1-10,11.  
– by running the car in the garage  
– by holding it to the tailpipe of the car  
– by putting it next to the furnace vent  
A. DO NOT try to test your alarm by doing any of the above! Testing  
the alarm using any of the methods listed above usually does not yield  
satisfactory results and could in fact be dangerous. To accurately test  
the CO alarm, please follow the guidelines given on pages 1-10,11.  
Never operate a vehicle in a closed garage, as high levels of CO can be  
built up in a short time. With an attached garage, dangerous CO levels  
develop inside the home as well as within the garage.  
Q. What happens if the power goes out?  
A. If the power goes out, your CO alarm will sound a fading alarm  
to alert you that power has been disconnected. When the power is  
restored, the alarm will automatically reset and will sound a brief  
alarm to indicate it is receiving power.  
Attempting to test the sensor function by holding the CO alarm next to  
a tailpipe or furnace vent may not cause a reading on the display  
because today’s vehicles emit very little CO once the engine reaches  
operating temperature. Likewise, many of today’s high efficiency fur-  
naces emit very low levels of CO.  
In the event of a power outage, it is important to remember never to  
use alternative sources of heat indoors such as charcoal, a gas oven  
or unvented space heaters. These heat sources can cause extremely  
dangerous amounts of carbon monoxide.  
 
6-1  
6-2  
Part Six Frequently Asked Questions  
Part Six Frequently Asked Questions  
Q. When I tried to test the alarm I got a high number on the  
digital display, but the alarm didn’t sound immediately. Why?  
A. Please refer to “How the unit determines when to alarm” on page  
5-2 for an explanation of the “time weighted alarm.”  
Q. My CO alarm shows a reading of 30 ppm. and then drops  
immediately to “0” ppm., what causes this?  
A. Per UL2034, (section 3,19) which states “Warning signal: except  
for alarm and trouble signals, no other audible and visual signals  
shall be used. (ie: warning signals that indicate the presence of CO  
less than 30 ppm.)”. Nighthawk CO alarms cannot display CO  
concentrations detected below 30 ppm. Under normal conditions,  
however by pressing the peak level button, concentrations of CO  
detected below 30 ppm will be displayed.  
Q. How much electricity does it take to run the CO alarm?  
A. The CO alarm uses less than one watt of electricity.  
A typical night light uses approximately four watts.  
Q. Will the CO alarm last longer if I unplug it during the sum-  
mer months and only use it during the winter?  
A. No. Some components of the CO alarm can deteriorate over time  
if not used regularly. We recommend the CO alarm be plugged in  
continuously for maximum alarm life.  
Q. I use the CO alarm in a vacation home that isn’t always  
occupied and can have temperature extremes when no one is  
there (no heat or no air conditioning). Will that hurt the CO  
alarm? Should I leave it plugged in all the time?  
A. We recommend that your CO alarm not be installed in areas  
where temperatures fall below 40˚F (4.4˚C) or rise above 100˚F  
(37.8˚C). Your CO alarm was designed to be constantly plugged in  
for maximum performance.  
Q. I plugged in the CO alarm at my house (my parents’, my  
neighbors’, etc.) and it read “0.” Does that mean everything is  
OK? (I’m thinking I can return the CO alarm since everything  
checks out OK.)  
A. This CO alarm is designed to act as a continuous monitor, it is  
not designed for use as a short-term testing device to perform a  
quick check for the presence of CO.  
Remember, a carbon monoxide problem can occur at any time,  
even after a professional inspection has determined that everything  
is in proper working order. Examples of problems that can develop  
are a crack in a furnace heat exchanger, a leak in a water heater  
vent, or a bird’s nest blocking a flue.  
Other sources are nearly impossible to detect: even a change in the  
air pressure outside can turn a normally safe situation deadly. That’s  
why you need the 24-hour protection provided by a CO alarm.  
 
6-3  
6-4  
Notes  
Limited Warranty  
WARRANTY COVERAGE: THE MANUFACTURER WARRANTS TO THE  
ORIGINAL CONSUMER PURCHASER, THAT THIS PRODUCT WILL BE FREE  
OF DEFECTS IN MATERIAL AND WORKMANSHIP FOR A PERIOD OF FIVE  
(5) YEARS FROM DATE OF PURCHASE. THE MANUFACTURER’S LIABILI-  
TY HEREUNDER IS LIMITED TO REPLACEMENT OF THE PRODUCT.  
REPAIR OF THE PRODUCT OR REPLACEMENT OF THE PRODUCT WITH  
REPAIRED PRODUCT AT THE DISCRETION OF THE MANUFACTURE. THIS  
WARRANTY IS VOID IF THE PRODUCT HAS BEEN DAMAGED BY ACCI-  
DENT, UNREASONABLE USE, NEGLECT, TAMPERING OR OTHER CAUSES  
NOT ARISING FROM DEFECTS IN MATERIAL OR WORKMANSHIP. THIS  
WARRANTY EXTENDS TO THE ORIGINAL CONSUMER PURCHASER OF  
THE PRODUCT ONLY.  
Warranty Disclaimers: Any implied warranties arising out of this sale, includ-  
ing but not limited to the implied warranties of description, merchantability  
and fitness for a particular purpose, are limited in duration to the above war-  
ranty period. In no event shall the Manufacturer be liable for loss of use of  
this product or for any indirect, special, incidental or consequential damages,  
or costs, or expenses incurred by the consumer or any other user of this  
product, whether due to a breach of contract, negligence, strict liability in tort  
or otherwise. The Manufacturer shall have no liability for any personal injury,  
property damage or any special, incidental, contingent or consequential  
damage of any kind resulting from gas leakage, fire or explosion.  
Some states do not allow limitations on how long an implied warranty lasts,  
so the above limitation may not apply to you.  
Some states do not allow the exclusion or limitation of consequential or inci-  
dental damages, so the above limitations or exclusions may not apply to you.  
Legal Remedies: This warranty gives you specific legal rights and you may  
also have other rights that vary from state to state.  
Warranty Performance: During the above warranty period, your product will  
be replaced with a comparable product if the defective product is returned,  
postage prepaid, to KIDDE Safety, Customer Service Department, 1-800-880-  
6788, together with proof of purchase date. Please include a note describing  
the problem when you return the unit. The replacement product will be in  
warranty for the remainder of the original warranty period or for six months,  
whichever is longer. Other than the cost of postage, no charge will be made  
for replacement of the defective product.  
Important: Do not remove back cover. Back cover removal will void war-  
ranty.  
Your Nighthawk Carbon Monoxide Alarm is not a substitute for property, dis-  
ability, life or other insurance of any kind. Appropriate insurance coverage  
is your responsibility. Consult your insurance agent.  
 

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