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Full Text Searchable PDF User Manual
SMOKE ALARM, AC POWERED,
WITH BATTERY BACK-UP &
TANDEM WIRE CONNECTION
CARBON MONOXIDE ALARM
& CARBON MONOXIDE (CO)
For a period of 12 months from the date of purchase, or a maximum of 18 months from the
date of manufacture, Gentex warrants to you, the original consumer purchaser, that your
smoke/CO Alarm will be free from defects in workmanship, materials, and construction under
normal use and service. The CO sensor has a limited warranty period of 5 years from date of
installation.If a defect in workmanship, materials, or construction should cause your smoke/CO
Alarm to become inoperable within the warranty period, Gentex will repair your smoke/CO
Alarm or furnish you with a new or rebuilt replacement smoke/CO Alarm without charge to you
except for postage required to return the smoke/CO Alarm to us. Your repaired or
replacement smoke/CO Alarm will be returned to you free of charge and it will be covered
under this warranty for the balance of the warranty period.
This warranty is void if our inspection of your smoke/CO Alarm shows that the damage or
failure was caused by abuse, misuse, abnormal usage, faulty installation, improper
maintenance, or repairs other than those performed by us.
ANY WARRANTIES IMPLIED UNDER ANY STATE LAW, INCLUDING IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE,
APPLY ONLY FOR THE WARRANTY PERIOD SPECIFIED ABOVE. PLEASE NOTE THAT
SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY
LASTS, SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU.
GENTEX WILL NOT BE LIABLE FOR ANY LOSS, DAMAGE, INCIDENTAL OR
CONSEQUENTIAL DAMAGES OF ANY KIND ARISING IN CONNECTION WITH THE SALE,
USE, OR REPAIR OF THIS SMOKE/CO ALARM. PLEASE NOTE THAT SOME STATES DO
NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL
DAMAGES. SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU.
If a defect in workmanship, materials, or construction should cause your Smoke/CO Alarm
to become inoperable within the warranty period, you must return the smoke/CO Alarm to
Gentex postage prepaid. You must also pack the smoke/CO Alarm to minimize the risk of it
being damaged in transit. You must also enclose a return address. smoke/CO Alarms
returned for warranty service should be sent to: Gentex Corporation, 10985 Chicago Drive,
Zeeland, MI 49464.
If we receive a smoke/CO Alarm in a damaged condition as the result of shipping, we will
notify you and you must file a claim with the Shipper.
THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS. YOU MAY ALSO
HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE.
10985 CHICAGO DRIVE,
ZEELAND, MI 49464
These materials have been prepared by Gentex Corporation ("Gentex") for informational purposes only, are necessarily summary, and are not purported to serve as legal advice and should not be used as such. Gentex makes no rep-
resentations and warranties, express or implied, that these materials are complete and accurate, up-to-date, or in compliance with all relevant local, state and federal laws, regulations and rules. The materials do not address all legal
considerations as there is inevitable uncertainty regarding interpretation of laws, regulations and rules and the application of such laws, regulations and rules to particular fact patterns. Each person's activities can differently affect the
obligations that exist under applicable laws, regulations or rules. Therefore, these materials should be used only for informational purposes and should not be used as a substitute for seeking professional legal advice. Gentex will not
be responsible for any action or failure to act in reliance upon the information contained in this material.
PHOTOELECTRIC TYPE SINGLE/MULTIPLE STATION SMOKE ALARM,
AC POWERED, WITH BATTERY BACK-UP & TANDEM WIRE CONNECTION
AND ELECTROCHEMICAL CARBON MONOXIDE ALARM
Installation Instructions - Owner's/User’s Information Manual -READ CAREFULLY AND SAVE
INTRODUCTION GN-503 SERIES
The GN-503 Series combination photoelectric smoke alarm and
electrochemical carbon monoxide (CO) alarm for use as an
evacuation device in all dwelling units. The device has a solid state
piezo signal to warn and alert the household to the presence of
threatening smoke and carbon monoxide.
Your combination smoke/CO alarm is designed to detect the
smoke that results from an actual fire or carbon monoxide gas.
Consequently, it is uncommon for household smoke such as
cigarette smoke or normal cooking smoke to cause an alarm.
BASIC SAFETY INFORMATION
Dangers, Warnings, Cautions and Notices alert you to important
operating procedures or to potentially hazardous situations. Pay
special attention to these items.
This combination photoelectric smoke/CO alarm is listed for use in
single-family and multi-family residences, along with hotels, motels
and other commercial residential occupancies.
This CO alarm will only indicate the presence of increased levels
of carbon monoxide gas at the sensor. Increased levels of carbon
monoxide gas may be present in other areas.
This combination smoke/CO alarm must receive continuous
120VAC, 60Hz , pure sine wave electrical power. (battery is meant
for emergency back-up only). In order for the emergency battery
back-up to work, a new battery must be properly installed (see
BATTERY INSTALLATION section).
NEVER ignore your combination smoke/CO alarm if it sounds.
Refer to IF YOUR SMOKE/CO ALARM SOUNDS section for more
information. Failure to do so can result in serious injury or death.
Test this device once a week. If the device ever fails to test
correctly, replace immediately! If the device is not working
properly, it can not alert you to a problem.
This product is intended for use in indoor locations of family
dwelling units. It is not designed to measure CO levels in
compliance with Occupational Safety and Health Administration
(OSHA) commercial or industrial standards. Individuals with
medical conditions that may make them more sensitive to carbon
monoxide may consider using warning devices which provide
audible and visual signals for carbon monoxide concentrations
under 30 ppm. For additional information on carbon monoxide and
your medical condition, contact your physician.
(SEE BACK OF SMOKE/CO ALARM FOR EXACT MODEL)
*GN-503..........................120VAC, 60Hz with temporal horn
* These units produce a temporal audible alarm for smoke alarm
notification. Per NFPA 72, the American National Standard Audible
Emergency Evacuation Signal as defined in ANSI S3.41, is required
whenever the intended response is to evacuate the building.
F - 1 Form A/1 Form C Auxiliary Relay
OPERATING VOLTAGE. . . . . . . . . 120VAC, 60Hz
OPERATING CURRENT. . . . . . . . . 0.045 amps
TEMPERATURE RANGE . . . . . . . 40
F to 100
ALARM HORN RATING. . . . . . . . . 85dBA at 10 feet
NOTICE: In the event AC Power fails, a 9VDC battery will provide
proper alarm operation for a minimum of 24 hours.
SMOKE & CARBON MONOXIDE (CO) ALARM
Under normal conditions, the light generated by the pulsing
infrared LED is not seen by the light sensor, as it is positioned out of
the direct path of the light beam. When smoke enters the sensing
chamber, light from the pulsing LED light source is reflected by the
smoke particles onto the photodiode light sensor. At the first sighting
of smoke, the device is put into a pre-alarm mode. This is indicated
by a rapidly flashing red LED on the face of the smoke/CO alarm.
Once the light sensor confirms smoke for 2 consecutive pulses
inside the chamber, the light sensor produces the signal necessary
to trigger the device and sound the electronic horn.
GENERAL INFORMATION - CARBON MONOXIDE ALARM
NOTICE: CO problems can occur at any time.
When fully powered, the device samples the air and takes a new
reading about every 30 seconds. A microchip inside the unit stores
each reading and remembers the levels of CO it has been exposed
to over time. The CO portion of the smoke/CO alarm will sound
when it has been exposed to a critical level of CO (measured in
parts per million or ppm) within a specified time (measured in
minutes). This CO alarm features a permanently installed sensor, an
indicator light and an 85dBA, temporal 4 alarm horn. It also has a
reset feature to temporarily quiet the alarm horn. If critical levels of
CO remain, the alarm will re-activate and sound.
NOTICE: MALFUNCTION WARNING This unit performs a self-
diagnostic test. If the alarm malfunctions it should be replaced
immediately. See IF THE CO ALARM IS NOT OPERATING
PROPERLY for more information.
HOW TO TELL IF THE SMOKE/CO ALARM IS
Your device is provided with an alarm horn and flashing red Light
Emitting Diode (LED) indicator, which flashes every 15-30
seconds, and a green AC power on LED and red LED for CO.
Test button function: when test button is pressed, the full operation
of the light source, light sensor and CO sensor circuit are verified
and will initiate an alarm.
HOW THE SMOKE/CO ALARM WORKS
GENERAL INFORMATION - SMOKE ALARM
The GN-503 Series alarm operates on the photoelectric light
scatter principle for the smoke sensor and electrochemical sensing
principal for the CO sensor. The device’s sensing chamber houses
a light source and a light sensor.
For smoke detection, the darkened sensing chamber is exposed
to the atmosphere and designed to permit optimum smoke entry
from any direction while rejecting light from outside the smoke/CO
The light source is an infrared (invisible) LED which pulses every
30 seconds to detect smoke. The light sensor is a photodiode
matched to the light frequency of the LED light source.
g. Meet at your prearranged meeting place after leaving the house.
h. Call the Fire Department as soon as possible from outside your
house. Give the address and your name.
i. Never re-enter a burning building.
Contact your local Fire Department for more information on
making your home safer from fires and about preparing your family's
NOTE: Current studies have shown smoke/CO
alarms may not awaken all sleeping individuals,
and that it is the responsibility of individuals in the
household that are capable of assisting others to
provide assistance to those who may not be awak-
ened by the alarm sound, or to those who may be
incapable of safely evacuating the area unassisted.
WHAT THIS SMOKE/CO ALARM CAN DO
This smoke/CO alarm is designed to sense smoke entering its
sensing chamber. It does not sense heat or flames.
When properly located, installed, and maintained, this smoke/CO
alarm is designed to provide early warning of developing fires at a
reasonable cost. This device monitors the air and, when it senses
smoke, activates its built-in alarm horn. It can provide precious time
for you and your family to escape from your residence before a fire
spreads. Such an early warning, however, is possible only if the
smoke/CO alarm is located, installed, and maintained as specified in
this User's Manual.
This smoke/CO alarm is designed for use within single residential
living units only; that is, it should be used inside a single-family home
or one apartment of a multi-family building. In a multi-family building,
the device may not provide early warning for residents if it is placed
outside of the residential units, such as on outside porches, in
corridors, lobbies, basements, or in other apartments. In multi-family
buildings, each residential unit should have smoke/CO alarms to
alert the residents of that unit. Devices designed to be
interconnected should be interconnected within one family residence
only; otherwise, nuisance alarms will occur when a smoke/CO alarm
in another living unit is tested.
NOTICE: WHAT SMOKE/CO ALARMS CANNOT DO
Smoke/CO alarms will not work without power. A battery
must be connected to the device to maintain proper operation if AC
power supply is cut off by an electrical fire, an open fuse or
circuit breaker, or for any other reason. In the event of AC power
failure, the battery will supply power for a minimum of 24 hours.
Smoke/CO alarms may not sense fire that starts where
smoke cannot reach the units such as in chimneys, in walls, on
roofs, or on the other side of closed doors. If bedroom doors are
usually closed at night, smoke/CO alarms should be placed in each
bedroom as well as in the common hallway between them.
Smoke/CO alarms also may not sense a fire on another level
of a residence or building. For example, a second-floor device
may not sense a first-floor or basement fire. Therefore, smoke
alarms should be placed on every level of a residence or
The horn in your device meets or exceeds current audibility
requirements of Underwriters Laboratories. However, if the
smoke/CO alarm is located outside a bedroom, it may not wake
up a sound sleeper, especially if the bedroom door is closed or only
partly open. If the device is located on a different level of the
residence than the bedroom, it is even less likely to awaken people
sleeping in the bedroom. In such cases, the National Fire Protection
Association recommends that the smoke/CO alarms be
interconnected so that a unit on any level of the residence will sound
an alarm loud enough to awaken sleepers in closed bedrooms. This
can be done by employing a systematic approach by interconnecting
smoke/CO alarms together, or by using radio frequency transmitters
All types of smoke/CO alarm sensors have limitations. No
type of device can sense every kind of fire every time. These
types of fires include:
1) Fires where the victim is intimate with a flaming initiated fire;
for example, when a person’s clothes catch on fire while
2) Fires where the smoke is prevented from reaching the
smoke/CO alarm due to a closed door or other obstruction.
3) Incendiary fires where the fire grows so rapidly that an
occupant’s egress is blocked even with properly located
If the battery is low or missing, a chirp will be emitted. If the
smoke/CO alarm is malfunctioning, two chirps will sound. If AC
power fails, the green LED will turn off. Reference Troubleshooting
Guide on page 5-9.
NOTE: Tandem Interconnected Devices.
When testing one device, the device that is activated will flash the
red indicator light and sound its alarm horn. All other units will
sound the alarm horn with their red indicator lights remaining off.
FIRE PROTECTION PLAN: WHAT YOU CAN DO TO
MAKE YOUR FAMILY SAFE FROM FIRES
This smoke/CO alarm can quickly alert you to the presence of
smoke - it cannot prevent fire. The ultimate responsibility for fire
protection rests solely on you.
Installing smoke/CO alarms is just the first step in protecting your
family from fires. You also must reduce the chances that fires will
start in your home and increase your chances of safely escaping if
one does start. To have an effective fire safety program:
a. Install smoke/CO alarms properly following the instructions
in this manual. Keep your units clean. Test your smoke
alarm weekly and maintain or replace it when it no longer
functions. As with any electronic product, smoke/CO alarms
have a limited life, it is recommended that smoke/CO alarms be
replaced when end of life signal sounds. Smoke/CO alarms that
don't work cannot protect you.
b. Follow safety rules and prevent hazardous situations:
Use smoking materials properly; never smoke in bed.
Keep matches and cigarette lighters away from children.
Store flammable materials in proper containers and never use
them near open flames or sparks.
Keep electrical appliances and cords in good working order and
do not overload electrical circuits.
Keep stoves, fireplaces, chimneys, and barbecue grills grease-
free and make sure they are properly installed away from
Keep portable heaters and open flames such as candles away
from combustible materials.
Do not allow rubbish to accumulate.
Do not leave small children home alone.
c. Develop a family escape plan and practice it with your
entire family, especially small children.
Draw and post a floor plan of your home and find two ways to
exit from each room. There should be one way to get out of
each bedroom without opening the door.
Teach children what the smoke/CO alarm signal means, and
that they must be prepared to leave the residence by
themselves if necessary. Show them how to check to see if
doors are hot before opening them, how to stay close to the
floor and crawl if necessary, and how to use the alternate exit if
the door is hot and should not be opened.
Decide on a meeting place a safe distance from your house and
make sure that all your children understand that they should go
and wait for you if there is a fire.
Hold fire drills at least every 6 months to make sure that
everyone, even small children, know what to do to escape
Know where to go to call the fire department from outside your
Provide emergency equipment such as fire extinguishers and
teach your family to use this equipment properly.
d. Bedroom doors should be closed while sleeping if a
smoke/CO alarm is installed in the bedroom. They act as a
barrier against heat and smoke.
WHAT TO DO IF THERE IS A FIRE IN YOUR HOME
If you have prepared family escape plans and practiced them with
your family, you have increased their chances of escaping safely.
Review the following rules with your children when you have fire
drills so everyone will remember them in a real fire emergency. If
alarm should sound:
a. Don't panic; stay calm. Your safe escape may depend on thinking
clearly and remembering what you have practiced.
b. Get out of the house following a planned escape route as quickly
as possible. Do not stop to collect anything or to get dressed.
c. Open doors carefully only after feeling to see if they are hot. Do
not open a door if it is hot; use an alternate escape route.
d. Stay close to the floor; smoke and hot gases rise.
e. Cover your nose and mouth with a cloth, wet if possible, and take
short, shallow breaths.
f. Keep doors and windows closed unless you open them to escape.
In general, smoke/CO alarms may not always warn you
about fires caused by violent explosions, escaping gas,
improper storage of flammable materials, or arson.
NOTICE: This smoke/CO alarm is not designed to replace special-
purpose fire detection and alarm systems necessary to protect
persons and property in non-residential buildings such as
warehouses, or other large industrial or commercial buildings. It
alone is not a suitable substitute for complete fire-detection systems
designed to protect individuals in hotels and motels, dormitories,
hospitals, or other health and supervisory care and retirement
homes. Please refer to NFPA 101,The Life Safety Code, and NFPA
72 for smoke alarm requirements for fire protection in buildings not
defined as "households."
Installing smoke/CO alarms may make you eligible for lower
insurance rates, but smoke/CO alarms are not a substitute for
insurance. Home owners and renters should continue to insure
their lives and property.
NOTICE: GENERAL LIMITATIONS OF SMOKE/CO
This smoke/CO alarm is intended for all dwelling units. It is not
intended for use in industrial applications where Occupational Safety
and Health Administration (OSHA) requirements for carbon monox-
ide detectors must be met.
Smoke/CO alarms may not awaken all individuals. If children
and others do not readily awaken to the sound of the smoke/CO
alarm or if there are infants or family members with mobility
limitations, make sure that someone is assigned to assist them in the
event of an emergency.
Smoke/CO alarms will not work without power. This
smoke/CO alarm requires a continuous supply of power.
Smoke/CO alarms for solar or wind energy users and battery
back-up power systems: AC powered smoke/CO alarms should
only be operated with true or pure sine wave inverters. Operating
this device with most battery powered UPS (uninterruptible power
supply) products or square wave or “quasi sine wave” inverters will
damage the alarm. If you are not sure about your inverter or UPS
type, please consult with the manufacturer to verify.
This smoke/CO alarm will not sense carbon monoxide that
does not reach the sensor. This device will only sense CO at the
sensor. CO may be present in other areas. Doors or other obstruc-
tions may affect the rate at which CO reaches the alarm. For this
reason, if sleeping room doors are usually closed at night, we
recommend you install an alarm in each sleeping room and in the
hallway of each sleeping area.
Smoke/CO alarms may not sense CO on another level of the
residence. For example, an alarm on the second floor, near the
bedrooms may not sense CO in the basement. For complete
coverage, it is recommended that an alarm be installed on each
Smoke/CO alarms may not be heard. The alarm decibel rating
meets or exceeds current UL Standards of 85dBA at 10 feet (3
meters). However if the device is installed outside the sleeping area,
it may not awaken a sound sleeper, one who has recently used
drugs or has been drinking alcoholic beverages. This is especially
true if the door is closed or only partially open. Even persons who
are awake may not hear the sounding alarm if the sound is blocked
by distance or closed doors. Noise from traffic, stereo, radio,
television, air conditioner, or other appliances may also prevent alert
persons from hearing the alarm horn. This device is not intended for
people who are hearing impaired.
Smoke/CO alarms are not a substitute for life insurance.
Though these devices warn against increasing CO levels, Gentex
Corporation does not warrant or imply in any way that they will
protect lives from CO poisoning. Homeowners and renters must still
insure their lives.
Smoke/CO alarms have a limited life. Although the device and
all of its components have passed many stringent tests and are
designed to be as reliable as possible, any of these parts could fail
at any time. Therefore, you must test your smoke/CO alarm weekly.
Smoke/CO alarms are not foolproof. Like all other electrical
devices, smoke/CO alarms have limitations. They can only detect
CO that reaches their sensors. They may not give early warning to
rising CO levels if the CO is coming from a remote part of the home,
away from the alarm. NOTICE: smoke/CO alarms may not alarm
when a large influx of CO is introduced into the house. An example
of a possible source of a large in-rush of CO is a generator running
in an attached, enclosed garage and the door to the connected
residence is opened.
WHAT YOU NEED TO KNOW
WHAT IS CO? Carbon Monoxide (CO) is an invisible, odorless,
tasteless gas produced when fossil fuels do not burn completely or
are exposed to heat (usually fire). Electrical appliances typically do
not produce CO.
These fuels include: wood, coal, charcoal, oil, natural gas, gasoline,
kerosene and propane.
Common appliances are often sources of CO. If they are not
properly maintained, are improperly ventilated, or malfunction, CO
levels can rise quickly. CO is a real danger now that homes are
more energy efficient. “Air-tight” homes with added insulation,
sealed windows and other weatherproofing can ‘trap’ CO inside.
SYMPTOMS OF CO POISONING: These symptoms are related to
CO POISONING and should be discussed with ALL household
Some individuals are more sensitive to CO than
others, including people with cardiac, respiratory or other
health problems, infants, young children, pregnant women and
elderly people can be more quickly and severely affected by
CO. People sensitive to CO should consult their doctors for
advice on taking additional precautions.
FINDING THE SOURCE OF CO AFTER AN ALARM
Carbon monoxide is an odorless, invisible gas, which often
makes it difficult to locate the source of CO after an alarm. A few
factors that can make it difficult to locate sources of CO include:
House well ventilated before the investigator arrives.
Problem caused by “backdrafting”.
Transient CO problem caused by special circumstances.
Because CO may dissipate by the time an investigator arrives, it
may be difficult to locate the source of CO. Gentex Corporation
shall not be obligated to pay for any carbon monoxide (CO)
investigation or service call.
HOW CAN I PROTECT MY FAMILY?
A smoke/CO alarm is an excellent way of protection. It monitors
the air and sounds a loud alarm before carbon monoxide (CO) levels
become threatening for average, healthy adults.
NOTICE: A smoke/CO alarm is not a substitute for proper
maintenance of home appliances.
To help prevent CO problems and reduce the risk of CO poisoning:
Clean chimneys and flues yearly. Keep them free of debris,
leaves, and nests for proper air flow. Also, have a professional
check for rust and corrosion, cracks or separations. These
conditions can prevent proper air movement and cause
backdrafting. Never cap or cover a chimney in any way, that
would block air flow.
Test and maintain all fuel-burning equipment annually. Many local
gas or oil companies and HVAC companies offer appliance
inspections for a nominal fee.
Make regular visual inspections of all fuel-burning appliances.
Check appliances for excessive rust and scaling. Also check the
flame on the burner and pilot lights. The flame should be blue. A
yellow flame means fuel is not being burned completely and CO
may be present. Keep the blower door on the furnace closed.
Use vents or fans when they are available on all fuel-burning
appliances. Make sure appliances are vented to the outside. Do
not grill or barbecue indoors, in garages or on screen porches.
Check for exhaust backflow from CO sources. Check the draft
hood on an operating furnace for a backdraft. Look for cracks on
furnace heat exchangers.
Check the house or garage on the other side of shared wall.
Keep windows and doors open slightly. If you suspect that CO is
escaping into your home, open a window or door. Opening
windows or doors can significantly reduce CO levels.
SYMPTOMS OF CO POISONING
Slight headache, nausea, vomiting, fatigue
Throbbing headache, drowsiness, confusion,
rapid heart rate
Convulsions, unconsciousness, heart and lung
failure. Exposure to carbon monoxide (CO)
can cause brain damage and death
Figure 3: A SMOKE/CO ALARM MUST BE LOCATED BETWEEN
THE SLEEPING AREA AND THE REST OF THE DWELLING UNIT
AS WELL AS IN EACH BEDROOM.
Where to Locate the Required Smoke Alarms. The major threat
from fire in a dwelling unit occurs at night when everyone is asleep.
Persons in sleeping areas can be threatened by fires in the
remainder of the unit; therefore, smoke/CO alarms are best located
in each bedroom and between the bedroom areas and the rest of the
unit as shown in Figure 3.
In dwelling units with more than one bedroom area or with
bedrooms on more than one floor, more than one smoke/CO alarm
is required, as shown in Figure 4.
184.108.40.206 Where the area addressed in 220.127.116.11(2) is separated from
the adjacent living areas by a door, a smoke alarm shall be installed
in the area between the door and the sleeping room, and additional
alarms shall be installed on the living area side of the door as
specified by 18.104.22.168 and 22.214.171.124.
126.96.36.199 In addition to the requirements of 188.8.131.52(1) through
184.108.40.206(3), where the interior floor area for a given level of a
dwelling unit, excluding garage areas, is greater than 93m
smoke alarms shall be installed per 220.127.116.11.1 and 18.104.22.168.2.
22.214.171.124.1 All points on the ceiling shall have a smoke alarm within a
distance of 9.1m (30ft) travel distance or shall have an equivalent of
one smoke alarm per 46.5m
) is evaluated by dividing the
total interior square footage of floor area per level by 46.5m
126.96.36.199.2 Where dwelling units include great rooms or vaulted/
cathedral ceilings extending over multiple floors, smoke alarms
located on the upper floor that are intended to protect the
aforementioned area shall be permitted to be considered as part of
the lower floor(s) protection scheme used to meet the requirements
The installation of additional alarms of either the smoke, heat or
CO type should result in a higher degree of protection. Adding
alarms to rooms that are normally closed off from the required
alarms increases the escape time because the fire does not need to
build to the higher level necessary to force smoke out of the closed
room to the required alarms. As a consequence, it is recommended
that the householder consider the installation of additional fire
protection devices. However, it should be understood that NFPA 72
does not require additional smoke/CO alarms over and above those
called for in Figures 2, 3, 4 and 5 where required smoke/CO alarms
Figure 2: A SMOKE/CO ALARM MUST BE LOCATED ON EVERY
LEVEL OF DWELLING UNIT, INCLUDING BASEMENT, WITHIN
EACH SLEEPING ROOM AND OUTSIDE SLEEPING AREAS.
Transient CO Problems: transient or on-again-off-again CO
problems can be caused by outdoor conditions and other special
The following conditions can result in transient CO situations:
1) Excessive spillage or reverse venting of fuel appliances caused by
outdoor conditions such as:
Wind direction and/or velocity, including high, gusty winds. Heavy
air in vent pipes (cold/humid air with extended periods between
Negative pressure differential resulting from the use of exhaust
Several appliances running at the same time competing for limited
Vent pipe connections vibrating loose from clothes dryers,
furnaces or water heaters.
Obstructions in or unconventional vent pipe designs which can
amplify the above situations.
2) Extended operation of unvented fuel burning devices (range,
3) Temperature inversions, which can trap exhaust close to the
4) Car idling in an open or closed garage or near a home.
5) Portable generator used in an open or closed garage or near a
These conditions can come and go. They are also hard to
recreate during a CO investigation.
PLACEMENT OF SMOKE/CO ALARMS
THIS EQUIPMENT SHOULD BE INSTALLED IN ACCORDANCE
WITH THE NATIONAL FIRE PROTECTION ASSOCIATION'S
STANDARD 72 (National Fire Protection Association, Batterymarch
Park, Quincy, MA 02269).
For your information, the National Fire Protection Association's
Standard 72, reads as follows:
NFPA 72, 2007 Edition, Chapter 11, Section 11.5.1 Required
Detection, states the following:
188.8.131.52 Where required by applicable laws, codes or standards for a
specific type of occupancy, approved single and multiple-station
smoke/CO alarms shall be installed as follows:
1) In all sleeping rooms and guest rooms
2) Outside of each separate dwelling unit sleeping area, within 6.4m
(21ft) of any door to a sleeping room, the distance measured
along a path of travel
3) On every level of a dwelling unit, including basements
4) On every level of a residential board and care occupancy (small
facility), including basements and excluding crawl spaces and
5) In the living area(s) of a guest suite
6) In the living area(s) of a residential board and care occupancy
POTENTIAL SOURCES OF CO IN RESIDENTIAL
Fuel-burning appliances like: portable heater, gas or wood burning
fireplace, gas kitchen range or cooktop, gas clothes dryer, portable
Damaged or insufficient venting: corroded or disconnected water
heater vent pipe, leaking chimney pipe or flue, or cracked heat
exchanger, blocked or clogged chimney opening.
Improper use of appliance/device: operating a barbecue grill,
portable generator or vehicle in an enclosed area (like a garage or
screened porch), or even your home.
POTENTIAL SOURCES OF CO IN HOME.
Figure 4: IN DWELLING UNITS WITH MORE THAN ONE
SLEEPING AREA, A SMOKE/CO ALARM MUST BE PROVIDED TO
PROTECT EACH SLEEPING AREA IN ADDITION TO SMOKE/CO
ALARMS REQUIRED IN BEDROOMS.
NFPA states the following for replacement of smoke/CO
alarms: NFPA 720, 2009 Edition, Chapter 8, Section 8.10.2 states:
Smoke/CO alarms shall be replaced when either the end-of-life
signal is activated or the manufacturer’s replacement date is
reached. Alarms shall also be replaced with they fail to respond to
Smoke/CO alarms should be replaced when end of life signal
Dust, dirt, and other environmental contaminants can affect your
smoke alarm over a prolonged period.
Fast changing industry consensus standards and codes on all
smoke alarms make it advisable to periodically upgrade your
smoke alarm to maximize life safety.
Assurance that your smoke alarm needs are kept abreast with the
constantly improving electronic technology.
Smoke alarms are recognized as one of the lowest cost ways to
protect dwelling inhabitants against the danger of fire(s). It makes
good common sense to periodically replace and update your
smoke alarm that contributes so much to life safety.
This smoke/CO alarm can be mounted on a ceiling or wall with equal
efficiency in either location.
Ceiling location - smoke/CO alarm should be mounted as close as
possible to the center of a hallway or room. If this is not possible,
the edge of the smoke/CO alarm should be at least 4 inches from
Wall location - locate the top of the smoke/CO alarm at least 4
inches and not more than 12 inches from the ceiling.
Figure 6: RECOMMENDED SMOKE/CO ALARM MOUNTING
Figures 1, 2, 3, & 4 are reprinted with permission from NFPA 72, National Fire Alarm
Code®, Copyright ©2002, National Fire Protection Association, Quincy, MA 02169. This
reprinted material is not the complete and official position of the National Fire Protection
Association on the referenced subject which is represented only by the standard in its
entirety. National Fire Alarm Code® and NFPA 72® are registered trademarks of the
National Fire Protection Association, Inc., Quincy, MA 02169.
Figure 7: RECOMMENDED SMOKE/CO ALARM LOCATION IN
ROOMS WITH SLOPED, GABLED, OR PEAKED CEILINGS.
The placement of the smoke/CO alarm is critical if maximum speed
of fire detection is desired. Thus, a logical location for a smoke
alarm is the center of the ceiling. At this location, the device is
closest to all areas of the room.
WHERE ALARMS SHOULD BE INSTALLED IN
In mobile homes built after about 1978 that were designed and
insulated to be energy-efficient, smoke/CO alarms should be
installed as described in the section above.
In older mobile homes that have little or no insulation compared
to today's standards, uninsulated metal outside walls and roofs can
transfer heat and cold from outdoors, making the air right next to
them hotter or colder than the rest of the inside air. These layers of
hotter or colder air can prevent smoke from reaching a smoke/CO
alarm. Therefore, install devices in such units only on inside walls,
between 4 and 12 inches (10 and 30 cm) from the ceiling. If you are
not sure about the insulation level in your mobile home, or if you
notice that the walls or ceiling are unusually hot or cold, install the
device on an inside wall.
Minimum protection requires one smoke/CO alarm as close to
the sleeping area as possible. For better protection, install one
device in each room, but first read the "Locations to Avoid."
LOCATIONS TO AVOID
Nuisance alarms are caused by placing smoke/CO alarms where
they will not operate properly. To avoid nuisance alarms, do not
place smoke/CO alarms:
In or near areas where combustion particles are normally
present such as kitchens; in garages where there are particles
of combustion in vehicle exhausts; near furnaces, hot water
heaters, or gas space heaters. Install smoke/CO alarms at least
20 feet (6 meters) away from kitchens and other areas where
combustion particles are normally present.
In air streams passing by kitchens. Figure 8 shows how a
smoke/CO alarm can be exposed to combustion particles in
normal air movement paths, and how to correct this situation.
Figure 5: A SMOKE/CO ALARM MUST BE LOCATED ON EACH
LEVEL IN ADDITION TO EACH BEDROOM.
In addition to smoke/CO alarms outside of the sleeping areas
and in each bedroom, NFPA 72 requires the installation of a smoke
alarm on each additional level of the dwelling unit, including the
basement. These installations are shown in Figure 5. The living
area smoke/CO alarm should be installed in the living room or near
the stairway to the upper lever, or in both locations. The basement
smoke/CO alarm should be installed in close proximity to the
stairway leading to the floor above. Where installed on an open-
joisted ceiling, the smoke/CO alarm should be placed on the bottom
of the joists. The smoke/CO alarm should be positioned relative to
the stairway so as to intercept smoke coming from a fire in the
basement before the smoke enters the stairway.
In damp or very humid areas, or next to bathrooms with
showers. The moisture in humid air can enter the sensing
chamber as water vapor, then cool and condense into droplets
that cause a nuisance alarm. Install smoke/CO alarms at least
10 feet (3 meters) away from bathrooms.
In very cold or very hot environments, or in unheated
buildings or outdoor rooms, where the temperature can go
below or above the operating range of the smoke alarm.
Temperature limits for proper operation are 40° to 100°F (4.4° to
In very dusty or dirty areas. Dust and dirt can build up on the
smoke alarm's sensing chamber and can make it overly sensitive,
or block openings to the sensing chamber and keep the smoke
alarm from sensing smoke.
Near fresh air inlets, returns or excessively drafty areas. Air
conditioners, heaters, fans, fresh air intakes and returns can drive
smoke away from smoke/CO alarms, making the devices less
In dead air spaces at the top of a peaked roof or in the
corners between ceilings and walls. Dead air may prevent
IMPORTANT SAFETY MESSAGES
This smoke/CO alarm is designed for use inside a single or
multi-family dwelling. It is not meant to be used in common
lobbies, hallways, or basements of multi-family buildings
unless working alarms are also installed in each family living
unit. Smoke/CO alarms in common areas may not be heard
from inside individual family living units.
This smoke/CO alarm is not a suitable substitute for complete
detection systems in places which house many people like
hotels or dormitories, unless a smoke/CO alarm is also placed
in each unit.
DO NOT use this smoke/CO alarm in warehouses, industrial or
commercial buildings, special-purpose non-residential
buildings or airplanes. This smoke/CO alarm is specifically
designed for residential use and may not provide adequate
protection in non-residential applications.
Never disconnect an AC CO alarm to silence a
nuisance alarm. Open a window or fan the air around the CO alarm.
The alarm will automatically turn off when the CO in the air is
completely gone. Do not stand close to the CO alarm. The sound
produced by the CO alarm is loud because it is designed to awaken
you in an emergency. Prolonged exposure to the horn at a close
distance may be harmful to your hearing.
MOUNTING OUTLET BOX
Use a 2" x 3" switch box or a 4" square or octagon junction box.
Mount a box for each smoke/CO alarm. If wall mounting is desired,
be sure the box screws are oriented to upper right and lower left
corners. Be sure to use supplied Mounting Plate.
WIRING ONE ALARM
1. Run a minimum of 16 gauge, 2-conductor cable, plus ground (3
wires) to the junction box from a power supply. Smoke/CO alarms
shall be connected to their own dedicated circuit. Use UL Listed
Class 1 wire.
NOTE: The wiring to be used shall be in accordance with the
provisions of Article 300.3(b) 210 of the National
Electrical Code, ANSI/NFPA 70 as well as Article 210.
2. Make wire connections to the supplied plug-in connector as
follows: black to black, white to white, and connect the ground
wire to the metal outlet box.
WIRING TWO OR MORE ALARMS
NOTE: All smoke/CO alarms in a tandem installation must be
controlled by the same fuse or circuit breaker. Otherwise tandem
units will not operate. Tandem will operate in the event of AC power
failure if battery is connected to the smoke alarm.
LIMITATIONS: A maximum of 12 smoke/CO alarms (GN-503)
may be connected together. Do not exceed 125 feet between each
device. Do not exceed 1125 feet between first and last smoke/CO
INSTALLATION GN-503 SERIES
NOTICE: New Construction: DO NOT attach smoke/CO alarm head
until AFTER sanding, painting, and other dust creating situations are
finished and cleaned up.
1. Use U.L. Listed cable with Class 1 insulation.
2. Observe local code requirements. Use box connector to anchor
cable to outlet box.
3. Metal outlet boxes must be grounded to earth ground.
4. NOTICE: Use only Duracell MN 1604 battery with the GN-503
Series smoke/CO alarms. Available at many retail stores.
smoke from reaching a smoke alarm. See Figures 6 and 7 for
recommended mounting locations.
In insect-infested areas. If insects enter a smoke/CO alarm's
sensing chamber, they may cause a nuisance alarm. Get rid of
the bugs before installing smoke/CO alarms where bugs are a
Near fluorescent light fixtures. Electrical "noise" from nearby
fluorescent light fixtures may cause a nuisance alarm. Install
smoke/CO alarms and fluorescent lights on separate electrical
Never disconnect an AC smoke/CO alarm to silence
a nuisance alarm. Open a window or fan the air around the device
to remove the smoke. The alarm will automatically turn off when the
smoke in the air is completely gone. Do not stand close to the
device. The sound produced by the smoke alarm is loud because it
is designed to awaken you in an emergency. Prolonged exposure to
the horn at a close distance may be harmful to your hearing.
WHERE SMOKE/CO ALARMS SHOULD NOT BE
DO NOT INSTALL THIS CO ALARM:
In garages, kitchens, furnace rooms, or in any extremely dusty,
dirty or greasy areas.
Closer than 15 feet (4.6 meters) from a furnace or other fuel
burning heat source or fuel burning appliance like a water heater.
Within 5 feet (1.5 meters) of any cooking appliance
Near any type of diaper pails or receptacle.
Near animal litter boxes, cages or kennels.
In extremely humid areas. This alarm should be at least 10 feet (3
meters) from a bath or shower, sauna, humidifier, vaporizer, dish
washer, laundry room, utility room or other source of high humidity.
In areas where temperature is colder than 40°F (4°C) or hotter
than 100°F (38°C). These areas include non-air conditioned crawl
spaces, unfinished attics, uninsulated or poorly insulated ceilings,
porches and garages.
In turbulent air, like near ceiling fans, heat vents, air conditioners,
fresh air returns, or open windows. Blowing air may prevent CO
from reaching the sensors.
In direct sunlight
In outlets covered by curtains or other obstruction.
Turn off electricity to prevent SHOCK and damage to
smoke/CO alarm. Be sure the power line to the smoke/CO alarm is
not controlled by any on/off switch, or other type of switch, other than
a fuse or circuit breaker.
NOTICE: Ensure that all fluorescent lighting fixtures are properly
NOTE: The wiring to be used shall be in accordance with the provi-
sions of Article 210 of the National Electrical Code, ANSI/NFPA 70.
Wire installation should be performed only by a licensed electrician.
NOTE: RED-YELLOW WIRE AND BROWN-YELLOW WIRE: The
red-yellow wire and brown-yellow wire from the smoke/CO alarm is
for tandem connection only. DO NOT USE, AND DO NOT REMOVE
INSULATION CAP UNLESS CONNECTING ANOTHER CO ALARM,
SMOKE/CO ALARM OR SMOKE ALARM.
EARTH GROUND -
FOR METAL BOXES
Use brown/yellow wire to tandem interconnect GN-503 Series
alarms to additional GN-503 Series and CO1209 Series.
DO NOT USE RED/YELLOW TO INTERCONNECT GN-503
SERIES AND CO1209 SERIES. If the red/yellow is used to
interconnect the GN-503 Series to additional GN-503 Series and
CO1209 Series, the units will not be tandem interconnected. The
brown/yellow MUST be used.
MOUNTING: PLATE & SMOKE/CO ALARM
1. Lace the connector through the provided mounting plate and
secure the plate to the junction box.
2. Plug the wire connector into the smoke/CO alarm base.
NOTES ON TANDEM INTERCONNECTING MODELS
DO NOT connect Gentex Smoke Alarms to other manufacturers'
A maximum of 18 compatible smoke, heat,
CO and/or combination smoke/CO alarms may be interconnected.
No more than 12 of the 18 can be smoke alarms per NFPA72
No more than 12 Gentex model GN-503 or GN-503F may be
connected in tandem.
No more than 6 Gentex LEGACY products with Form A/Form C
contacts may be connected in tandem.
All units connected in tandem MUST get their power from the
same circuit, that is, all smoke alarms in tandem must be
controlled by the same fuse or circuit breaker.
After installation, to verify proper working conditions, all horns must
sound in this system.
When tandem interconnecting GN-503 Series to additional GN-503
Series or CO1209 Series and the smoke alarm horn sounds but
are not synchronized and the CO horn does not sound the
red/yellow wire has been used. Use brown/yellow wire.
3. Place device up to mounting plate, rotating it clockwise until
device firmly snap locks into place. Keep smoke alarm parallel to
the mounting plate so tabs on plate seat correctly into device.
4. Remove dust-cover after all construction is complete. Dust-
cover must be removed prior to power being supplied to the
smoke/CO alarm. If the dust-cover is not removed, operation of
smoke/CO alarm will be inhibited.
NOTE: Remove dust-cover before operating smoke/CO alarm
GROUND - FOR
METAL BOXES ONLY
1. Run a minimum of 16 gauge, 3-conductor cable, plus ground (4
wires) to the first junction box from a power supply and between
all smoke/CO alarms that are to be connected together. Use UL
Listed Class 1 wire. Power limited cable for multiple tandem
connections are available at many commercial electrical retail
NOTE: When using both tandem connections, 4-conductor
cable, plus ground (5 wires) will be used.
2. Make wire connections to the supplied plug-in connector as
follows: black to black, white to white, 3rd conductor to the
red/yellow wire for legacy Gentex products or the brown/yellow
wire for new . The red/yellow wire or brown/yellow wire should be
stripped to make the connection. Connect ground wire between
metal outlet boxes.
Maximum of 12
may be connected
together. Do not
exceed 125 feet
Do not exceed
1125 feet between
the first and last
Use red/yellow wire to tandem interconnect GN-503 alarms to
Gentex legacy products. Legacy products include 9120/9123
Series, 7100/7103 Series, 710CS/713CS Series, 7109CS/7139CS
Series, GN-200/GN-203 Series and GN-300/GN-303 Series.
Use brown/yellow wire to tandem interconnect GN-503 Series
alarms to additional GN-503 Series and CO1209 Series.
If the red/yellow wire is used to interconnect the GN-503 Series to
additional GN-503 Series and CO1209 Series, the units will not be
tandem interconnected. The brown/yellow MUST be used.
Do not tandem using both the red/yellow wire and brown/yellow
wire. Only 1 tandem interconnect wire is needed between units.
CAUTION: Failure to observe any of the conditions set forth may
cause system malfunction and damage to the device.
1. Locate side mounted battery drawer.
2. Open battery drawer by firmly pulling on side lip, then sliding
battery drawer open.
3. Insert battery into drawer, terminal side first. Take care to make
sure the appropriate terminal is aligned correctly, (+) terminal on
battery to (+) terminal on alarm metal contact and (-) terminal on
battery to (-) terminal on the alarm metal contact.
4. Rotate battery into drawer and close drawer. Note: the battery
drawer will not close if the battery is installed incorrectly.
5. Slide battery drawer shut until it is snapped into place.
6. Use only Duracell MN 1604 battery with the GN-503 Series
smoke/CO alarm. Available at many retail stores.
7. Push test button to verify battery operation.
NOTE: Units with battery back-up will not provide power or transmit
an alarm to other AC only units in the event of an AC power failure.
All battery back-up units in tandem with good batteries will operate
normally during an AC power failure a minimum of 24 hours
FOR SELF TEST.
AND HOLD UNTIL
NOTE: A maximum of 12 smoke/CO alarms of GN-503 with the
relay option (F) may be tandem interconnected.
Wire used for interconnection shall be in accordance with article
760 of the latest edition of National Electrical Code (NFPA 70) and
must not exceed a resistance of 10 ohms.
5. Press and release button for self test feature. Results of test:
Alarm is silent - Smoke/CO Alarm is in good working condition
Alarms have various limitations. See “General Limitations of
smoke/CO Alarms” for details.
3. Immediately move to fresh air - outdoors or by an open door or
window. Meet at prearranged meeting place after leaving the
house. Verify all persons are accounted for. Do not re-enter
premises or move away from the fresh air until the emergency
responder has arrived, the premise has been aired out and the
smoke/CO alarm remains in normal condition.
4. After following steps 1-3, if the smoke/CO alarm reactivates within
a 24-hour period, repeat steps 1-3 and call a qualified appliance
technician to investigate for sources of CO from fuel-burning
equipment and appliances as well as 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
manufacturers’ instructions, or contact the manufacturers 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 adjacent to the residence. Write down the
number of a qualified appliance technician here:
“ALARM - MOVE TO FRESH AIR”
If you hear the smoke/CO alarm horn and the red light is flashing,
move everyone to a source of fresh air. DO NOT unplug the alarm!
NEVER remove the battery from your alarm to silence the
horn; use the reset feature. Removing the battery, removes
your protection! See “If Your smoke/CO Alarm Sounds” for
details on responding to an alarm.
The reset feature is intended to reset the CO alarm while the
problem is corrected - IT WILL NOT CORRECT A CO PROBLEM.
While the alarm has been reset, the device will continue to monitor
the air for the presence of CO.
When CO reaches alarm levels, the alarm will sound a temporal
4 horn pattern - 4 beeps, a pause, 4 beeps, a pause, etc. Press the
reset button until the horn becomes silent. The initial reset cycle will
last approximately 5 minutes.
NOTE: After initial 5 minute reset cycle, the alarm will re-evaluate
present CO levels and respond accordingly. If CO levels remain
potentially dangerous, or increase to higher levels, the alarm will
While the alarm is silenced:
If the smoke/CO alarm:
Is silent for only 5 minutes,
CO levels are still
then the alarm sounds again
If the smoke/CO alarm:
Remains silent after the reset
CO levels are dropping
button has been pressed
Smoke/CO alarm goes
back into alarm 5
minutes after the reset
button was pressed.
CO levels indicate
IF YOU ARE
OF CO POISONING,
EVACUATE your home
and call 911 or the Fire
Department. If not,
press the reset button
again and keep
Green light is OFF. Red
light is not flashing.
Unit will not go into test
mode when reset
button is pressed.
Device may not be
NO AC and no
battery in device
electrical technician for
Alarm sounds 2 quick
chirps every 30
Device has become
dirty or defective.
Clean (refer to
or warranty return.
Alarm sounds 3 quick
chirps every 30
END OF LIFE
needs to be
Green light is ON and
red light is not flashing
and alarm chirps once
every 30 seconds
Low or no battery in
AC is powering
Replace battery (refer
to Battery Installation
Section) or return to
Reset button is
pressed. LED’s do not
flash and device does
not go into test mode.
Device is not
Only CO portion of
device is operating.
Smoke portion of
device is not
Any questions that are not answered within this manual, call Gentex
Corporation at 1-800-436-8391.
IF YOUR SMOKE/CO ALARM SOUNDS
Actuation of the smoke/CO alarm (temporal 4 tone) indicates the
presence of carbon monoxide (CO) which can kill you. If the
device alarm sounds, do not ignore the unit!
IF THE ALARM SIGNAL SOUNDS:
1. Operate the Test/Reset button. While the alarm has been reset,
the device will continue to monitor the air for the presence of CO.
If the alarm sounds again after 5 minutes there are CO levels that
are potentially dangerous.
2. Call emergency services, fire department or 911. Write the
number of your local emergency service here:
CHECKOUT & TROUBLESHOOTING
1. Supply house power to the smoke/CO alarm, green indicator
will be on. The red indicator light should flash approximately
every 15-30 seconds, showing that unit is operating properly.
2. If red light is not flashing or the green LED is not on:
a. Check that AC power is working.
b. Check that the battery is installed.
c. Push test button. Alarm will go into self test mode.
d. Check the connector plug and wire connections. NOTE: Be
sure you turn off power before checking wire connections.
e. If the power supply and wiring check out, but the red light does
not flash or the green LED is still off, return the unit to the
manufacturer. See TO RETURN AN ALARM.
3. When powering up devices in a tandem installation and all
the alarms sound immediately, inspect all devices for a solid
green LED. Verify wiring of units, if wiring checks and problem
remains, the devices with flashing red LED are the trouble units
and should be replaced.
4. If smoke/CO alarm becomes contaminated by excessive dust and
can not be cleaned, avoid nuisance alarms by replacing device.
USING THE RESET FEATURE
The reset feature is for your convenience only and will not
correct a CO problem. ALWAYS check your home for a
potential problem after any alarm. Failure to do so can result
in injury or death.
1 Chirp - Low battery. Replace battery following instructions in
Battery Installation Section
2 Chirps - Smoke/CO Alarm has become dirty or defective or
there is a large influx of CO. Clean (refer to Maintenance
Section) or warranty return.
3 Chirps - Smoke/CO Alarm is at end of life and must be replaced.
WARNING! Smoke/CO alarms are designed to alarm before there is
an immediate life threat. Since CO gas can not be seen or smelled,
never assume it is not present.
An exposure to 100 ppm of CO for 20 minutes may not affect a
healthy adult, after 4 hours of exposure at the same level may
An exposure to 400 ppm of CO may cause headaches in a healthy
adult after 35 minutes and could cause death after 2 hours.
NOTICE: This device measures exposure to CO over time. This
device alarms if CO levels reach a certain minimum over an
extended amount of time. The device will go into alarm before the
onset of symptoms in healthy adults. It is important to have early
notification of a potential hazard, while still having the ability to react
in time. In many reported cases of CO exposure, victims may be
aware that they were not feeling well, but became disoriented and
could no longer react well enough to exit the building or get help.
NOTE: Healthy adults may not experience any symptoms of CO
exposure when the device alarms, however infants, young children,
pregnant women, elderly people, people with cardiac, respiratory or
other health related issues may be more quickly and severely
affected by CO exposure. If even mild symptoms of CO poisoning,
consult a medical professional immediately.
Standards: Underwriters Laboratories, Inc. Single and Multiple
Station carbon monoxide alarms UL 2034. For your information, the
UL 2034 Standard, reads as follows:
Underwriters Laboratories, Inc UL 2034, Section 1-1.2 Carbon
monoxide alarms covered by these requirements are intended to
respond to the presence of carbon monoxide from sources such as,
but not limited to, exhaust from internal-combustion engines, abnor-
mal operation from fuel-fired appliances and fireplaces. CO alarms
are intended to alarm at carbon monoxide levels below those that
could cause a loss of ability to react to the dangers of carbon
This alarm monitors the air at the device and is designed to
alarm before CO levels become life threatening. This allows
precious time to leave the house and correct the problem. This is
only possible if the devices are properly located, installed and
maintained as described in this manual.
Gas Detection at Typical Temperature and Humidity Ranges:
This device is not formulated to detect CO levels below 30 ppm
typically. UL tested for false alarm resistance to Methane (500 ppm),
Butane (300 ppm), Heptane (500 ppm), Ethyl Acetate (200 ppm),
Isopropyl Alcohol (200 ppm) and Carbon Dioxide (5000 ppm).
Values measure gas and vapor concentrations in parts per million.
Audible Alarm: 85dBA minimum at 10 feet (3 meters).
TO RETURN AN ALARM
Should you experience problems with your smoke/CO alarm,
proceed as follows:
1. Turn off electrical power to the smoke/CO alarm.
2. Twist the smoke/CO alarm counter-clockwise to remove it from its
3. Unplug the connector from the back of the smoke/CO alarm. Do
not remove the wire connection; leave the connector for your
replacement smoke/CO alarm.
4. Remove battery from smoke/CO alarm. Do not ship smoke/CO
alarm with battery still in battery drawer.
5. Carefully pack (the manufacturer cannot be responsible for
consequential damage) and return to the manufacturer. Include
complete details as to exact nature of difficulties being
experienced and date of installation.
6. Return to: Gentex Corporation, 10985 Chicago Drive, Zeeland,
Michigan 49464. Prior to returning, call Gentex at 800-436-8391
or e-mail FP_RMA@gentex.com to obtain a RMA Number from
our return department.
NOTICE: Do not cover, tape, or otherwise block the openings of your
smoke/CO alarm. These openings are designed to allow air to pass
through your smoke/CO alarm, thus sampling the air around the
NOTICE: Smoke/CO alarms are not to be used with detector
guards unless the combination has been evaluated by a
nationally recognized testing laboratory and found suitable for
FAILURE TO REGULARLY CLEAN THIS SMOKE/CO ALARM
WILL RESULT IN FALSE ALARMS. A BUILD UP OF DUST
CREATES AN OBSCURATION THAT SIMULATES SMOKE. THIS
MEANS THE UNIT WILL GO INTO ALARM WITHOUT A FIRE
Press the test/reset button on the alarm until the alarm sounds.
During testing the device will simulate a smoke condition in the
alarm followed by an electrical test of the CO sensor. LED’s will
flash to indicate testing.
The alarm sequence should last 10-20 seconds. If the device
does not alarm, make sure it is fully operational. If the device still
does not go into alarm mode when tested, replace the device
If the alarm ever fails to test properly, replace it immediately.
Products under warranty may be returned to the manufacturer
for replacement, see “Limited Warranty.”
DO NOT stand close to the device when the alarm is sound-
ing. Exposure at close range could result in hearing damage.
Never use exhaust from vehicle to test CO portion of alarm.
Exhaust may cause permanent damage to alarm and voids the
TO KEEP THE ALARM WORKING PROPERLY:
Test weekly as described in “Weekly Testing.”
Keep alarm cover clean using soft cloth. DO NOT vacuum or use
compressed air, water, cleaners or solvents to clean alarm.
Replace battery immediately if low battery warning is heard. See
“Battery Installation” section.
NOTICE: DO NOT spray cleaning chemicals or insect sprays
directly on or near the alarm. DO NOT paint over the alarm.
Doing so may cause permanent damage.
Household cleaners, aerosol chemicals and other contaminants
can affect the sensor. When using any of these materials near the
alarm, make sure the room is well ventilated.
The CO alarm is not washable. DO NOT submerge the alarm in
water. Water can affect the sensor, causing permanent damage.
If your home is being fumigated, disconnect unit
temporarily from wire harness and store where it will not be
exposed to chemicals or fumes. When fumigation is complete
and all traces of fumes clear, re-connect unit back to wire
harness and push the reset button.
UNDERWRITERS LABORATORIES, INC. UL 2034
WHAT LEVELS OF CO CAUSE AN ALARM
UL Standard UL 2034 requires residential smoke/CO alarms to
sound when exposed to levels of CO and exposure times as
described below. CO levels are measured in part per million (ppm)
of CO over time (in minutes).
Approximately 10% COHb exposure at levels of 10% to 95%
Relative Humidity (RH).
DO NOT open smoke/CO alarm for cleaning. IF SMOKE/CO
ALARM IS OPENED, PRODUCT WARRANTY BECOMES VOID.
CAUTION: If the device does not work properly, do not try and fix it
yourself. This will void your warranty. See "To Return a Smoke/CO
Alarm" for instructions to return smoke alarms that do not operate
properly. DO NOT TRY TO FIX IT YOURSELF.
Gentex recommends CO alarms be tested a minimum of once a
week. The test feature of your CO alarm accurately simulates CO
conditions and tests the CO alarm's functions as required by
CAUTION: Never use an open flame of any kind to test your device.
You may ignite and damage the smoke/CO alarm as well as your
home. The test feature of your smoke/CO alarm accurately
simulates smoke conditions and tests the device's functions as
required by Underwriters Laboratories.
UL 2034 Required Alarm Points
If the smoke/CO alarm is exposed to 400 ppm of CO, THE
DEVICE MUST ALARM BETWEEN 4 - 15 MINUTES.
If the smoke/CO alarm is exposed to 150 ppm of CO, THE
DEVICE MUST ALARM BETWEEN 10 - 50 MINUTES.
If the smoke/CO alarm is exposed to 70 ppm of CO, THE DEVICE
MUST ALARM BETWEEN 60 - 240 MINUTES.
The device is designed not to alarm when exposed to a constant
level of 30 ppm for 30 days.
Product Installation Notes
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Product Installation Notes
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