ELRO CBFC28 User manual

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EN MANUAL
CARBON MONOXIDE ALARM
CBFC28
• If CO concentraon overruns 20PPM, the funcon of
temperature display will be disable.
3.3 CO alarm warning
When the device detects a dangerous level of CO, the device will
emit a loud alarm paern. The alarm signal paern is 4 beeps
followed by 2 seconds of silence. The ALARM indicator (red) will
flash the same paern. This cycle repeats as long as a dangerous
CO condion exists.
Alarm sensivity seng:
Conforms to EN 50291-1:2018
030PPM : Without alarm before 120 minutes
050PPM : Alarm between 60 to 90 minutes
100PPM : Alarm between 10 to 40 minutes
300PPM : Alarm within 3 minutes
NOTE: Refer to “3. What to do if the alarm sounds” when you
hear the sounds of the CO alarm warning.
3.4 CO alarm warning silence
During the device under CO alarm mode, pressing
theTEST/SILENCE buon, it will be paused alarm sound of the
device about 10 minutes. The ALARM indictor (red) will keep
flash as CO alarm mode, it indicates the device is running into
the CO alarm silence mode.
NOTE: The audible alarm signal will reacvate about 10
minutes from the me the TEST/SILENCE buon is operated
where the concentraon of CO surrounding the alarm remains at
50 PPM or greater.
NOTE: The audible alarm signal cannot to silence if the alarm
at concentraon above 200 PPM.
NOTE: The alarm silencing acvaon to once throughout a CO
alarm period.
WARNING! Before enable feature of CO alarm warning silence,
you should be confirmed that the alarm is due to dangerous
levels of carbon monoxide and the dwelling should be venlated.
3.5 Low baery voltage warning
If the device chirps once every 40 seconds, with FAULT indicator
(yellow) will be flash. It indicates the baery is low. The LCD
displays always displays " ".
NOTE: When the low baery voltage warning is occur, the device
has capable of producing a CO alarm signal for at least 4 min or
30 days of low baery voltage warning signal operaon.
NOTE: The device will not protect against the risk of carbon
monoxide poisoning when the baery has drained.
3.6 Low baery voltage warning silence
When the device is under the low baery warning, pressing the
TEST/SILENCE buon, it will come into a low baery voltage
warning silence status for about 9 hours, meanwhile it will
appear " " on LCD, and FAULT indicator (yellow) sll keep
flashing.
NOTE: The silence feature of low baery voltage warning is
temporary acon to cancel warning sound effect, you need
replace the baery as soon as possible.
3.7 Fault warning
If the device chirps twice every 40 seconds with FAULT indicator
(yellow) will be flash. It indicates the CO alarm is in malfuncon
condion. The LCD displays " Err ", that means your CO alarm
have no detecng funcon and no respond CO.
NOTE: Maybe the sensor is missing, replace the device
immediately. Please contact us to more service.
3.8 Fault warning silence
When the device is in a fault state, press the TEST/SILENCE
buon, it will enter the fault warning mute state for about 9
hours, while displaying " " on the LCD, and the FAULT indicator
(yellow) remains flashing.
NOTE: The silence feature of fault warning is a temporary acon
to cancel warning sound effect, you need replace the device as
soon as possible.
3.9 End-of-life warning
If the device chirps 3 mes every 40 seconds with FAULT
indicator (yellow) flash and the LCD displays ‘End’. It indicates
end of life of CO alarm. You need to immediately replace the CO
alarm.
3.10 End-of-life warning silence
When the device is in the End-of-life state, press the
TEST/SILENCE buon, it will enter the End-of-life warning mute
state for about 9 hours, while displaying " " on the LCD, and the
FAULT indicator (yellow) remains flashing.
NOTE: The silence feature of fault warning is a temporary acon
to cancel warning sound effect, you need replace the device as
soon as possible.
Entree
Manufacturer
Siterwell Electronics CO., Limited
No.666 Qingfeng Road, Jiangbei District,
Ningbo, Zhejiang Province, China 315034
Importer:
ELRO Europe | www.elro.eu
Postbus 9607 - Box E800
1006 GC Amsterdam The Netherlands
Minimum
Extra
• Reliable electrochemical sensor
• Incl. 2x 1,5V baeries
• Silence mode
• Low-baery indicator
• End-of-life indicator
The alarm should be installed by a competent person.
This apparatus is designed to protect individuals from the acute
effects of carbon monoxide exposure. It will not fully safeguard
individuals with specific medical condions. If in doubt consult a
medical praconer.
Document nr.: CBFC28_MN_EN | Revision nr. : 2 | Revision date: 22-09-2021
Type B apparatus
EN50291-1:2018

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Thank you for purchasing the CBFC28 carbon
monoxide (CO) alarm.
This unit uses advanced electrochemical sensor, and with LCD
digital display for CO concentraon. Please take a few minutes to
thoroughly read the user manual before operang or servicing
and familiarize yourself andyour family with its operaon. And
save for future reference.
CAUTION:
This CO alarm is designed for indoor use only. Do not expose to
rain or moisture. Do not knock or drop the detector. Do not open
or tamper with the alarm as this could cause malfuncon. The
alarm will not protect against the risk of carbon monoxide
poisoning when the baery has drained. Installaon of the alarm
should not be used as a substute for proper installaon, use
and maintenance of fuel burning appliances including
appropriate venlaon and exhaust systems.
WARNING! - Do NOT try to repair the device, it has the risk of
electric shock or malfuncon if the device is tampered with.
Table of Contents
1. Installaon instrucons
2. Product overview
3. Understanding your CO alarm
4. What to do if the alarm sounds
5. Baery installaon/replacement
6. General maintenance
7. Carbon monoxide overview
8. Specificaon
1. INSTALLATION INSTRUCTIONS
1.1 Installaon locaon
When choosing your installaon locaons, make sure you can
hear the alarm from all sleeping areas. If you install only one CO
alarm in your home, install the alarm near bedrooms. Not in the
basement or furnace room. The recommended posion for the
unit should be at least 1.8 meters (about 6 feet) above the floor
level.
CAUTION: This alarm should be installed by a competent person.
1.2 Mounng step
1. Drilling two ф5.0mm holes in the wall, the distance between
two holes center is 52mm, then inserng two plasc stopper
provided into the holes.
2. Insert the two screws provided unl the screw heads are
approximately 5mm from wall.
3. Test the unit by using the TEST/SILENCE buon. Ensure the
unit sound is alarm paern.
4. Hook the unit over the screws onto keyholes in back of unit.
1.3 Recommended installaon locaons:
The following suggesons are intended to help you with the
placement and installaon of your CO alarm.
• Place out of the reach of children. Under no circumstance
should children be allowed to handle the CO alarm.
• Install in a bedroom or hallway located close to the sleeping
area. Take special care to verify the alarm can be heard in
sleeping areas.
• It is recommended that a CO alarm be installed on each level
of a mullevel home.
• Locate 1~3 meter (3.3~10feet) away from all fuel burning
appliances.
• Placing at eye level allows for opmum monitoring of the red
and green indicator lights.
• Insure that all vents of the unit are unobstructed.
• Do not install in dead air spaces such as peaks of vaulted
ceilings, or gabled roofs.
• Do not install in turbulent air from ceiling fans.
• Do not place near fresh air vents or close to doors and
windows that open to the outside.
• Keep the CO alarm away from excessively dusty, dirty, or
greasy areas such as kitchens, garages and furnace rooms.
Dust, grease and household chemicals can affect the sensor.
• Keep out of damp and humid areas such as the bath room.
• Avoid spraying aerosols near the CO alarm.
• Do not install in areas where the temperature is below -10°C
or hoer than 45°C.
• Do not place behind curtains or furniture. CO must be able to
reach the sensor for the unit to accurately detect CO.
2. PRODUCT OVERVIEW
2.1 FAULT indicator
The FAULT indicator (yellow LED) is used to indicate fault or
warning status of the CO alarm.
2.2 POWER indicator
The POWER indicator (green LED) is used to indicate power
status of the CO alarm. The POWER indicator will flash every 40
seconds.
2.3 ALARM indicator
The ALARM indicator (red LED) is used to indicate alarm status of
the CO alarm.
2.4 TEST/SILENCE buon
The TEST/SILECNE buon is used to test the unit. Press and hold
to enable TEST funcon.
2.5 Alarm sounder
The alarm sounder is used to send out CO alarm warning and
fault warning informaon.
2.6 LCD screen
Indicates CO concentraon and alarm status.
3. UNDERSTANDING YOUR CO ALARM
3.1 Start up
When first power on, the POWER indicator (green) flash every
second, This is preheated state, 60 seconds later the POWER
indicator (green) flashing every 40 seconds indicates the unit is
funconing properly. The LCD displays all segments 4s and count
down. When the countdown is "0", the product goes into normal
operaon.
3.2 Normal operaon
• The POWER indicator (green) flashing once every 40 seconds.
• The LCD alternately displays current CO concentraon and
temperature every 40s.
• CO concentraon display range 0~999PPM.
• If the CO concentraon is under 20PPM, the LCD will
display "0PPM".
• If the CO concentraon overruns 999PPM, the LCD will
display "999PPM".
• Temperature display range: -9~50°C.
CARBON MONOXIDE ALARM
2.5
2.4
2.6
2.2 2.32.1

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3.11 Test the device
When the device under normal operaon status, you can test the
device by TEST/SILENCE buon, PRESS and HOLD the
TEST/SILENCE buon, you should hear alarm sound paern
(<85dB) and with a corresponding ALARM indicator (red) flash.
Aer the eighth sound, the device will issuing a normal alarm
volume (≥85dB). Test process will stop when release the buon.
The LCD displays all segments during tesng.
NOTE: Aer the TEST/SILENCE buon is enabled, the alarm
sounds and the red alarm light flashes. This does not indicate
that CO is present.
NOTE: Test the device every year! If at any me your device does
not perform as described, replace it immediately.
3.12 Automac brightness adjustment
Automac brightness adjustment of POWER indicator (green). If
the ambient brightness is very low (night, indoor & lights off).
The flashing brightness of the POWER indicator (green) will be
reduced, so as to reduce the impact of the standby indicator light
on people.
NOTE: This funcon does not affect the brightness of the ALARM
indicator (red) and the FAULT indicator (yellow).
3.13 Weekly test
Recommend test the alarm weekly by pressing the TEST/SILENCE
buon to ensure the normal operaon of the equipment.
3.14 Alarm memory
48 hours alarm memory funcon. When the device detects CO
and alarms, when the device return to standby mode, and the
CO concentraon <20PPM, LCD displays "AL" and ALARM
indicator (red) flash per 40 seconds. Aer press TEST/SILENCE
buon or aer 48 hours, will reset the historical memory
funcon and enter normal operaon status.
4. WHAT TO DO IF THE ALARM SOUNDS
WARNING! Actuaon of your CO alarm indicates the presence of
Carbon Monoxide (CO) which can KILL YOU.
4.1 Keep calm and open all doors and windows to increase the
rate of venlaon. Stop using all fuel-burning appliances
and ensure, if possible, that they are turned off, e.g. for gas
appliances, isolate the emergency control valve;
4.2 If the alarm connues to be acvated, then evacuate the
premises. Leave the doors and windows open, and only
reenter the building when the alarm has stopped. In
muloccupancy and mul-storey premises, ensure that all
the occupants are alerted to the risk;
4.3 Get medical help for anyone suffering the effects of carbon
monoxide poisoning, and advise that carbon monoxide
inhalaon is suspected;
4.4 Telephone the appropriate appliance servicing and/or
maintenance agency or, when necessary, the relevant fuel
supplier on their emergency number or the naonal Gas
Emergency Service Provider, if appropriate, so that the
source of carbon monoxide emissions can be idenfied and
corrected. Unless the reason for the alarm is obviously
spurious, do not use the fuel-burning appliances again, unl
they have been checked and cleared for use by a competent
person according to naonal regulaons.
5. BATTERY INSTALLATION/REPLACEMENT
Once chirps with corresponding FAULT indicator (yellow LED)
flashing once every 40 seconds indicates that the baery is low
baery, you must to replace with baery specified, please see
“8. Specificaon“ To install or replace the baery in unit, please
perform the following steps:
5.1 Take down the unit from screw heads of the wall.
5.2 Open baery compartment.
5.3 Remove the old baeries, and replace by new baeries.
5.4 Put the baery into the baery box.
5.5 Hook the alarm over the screw heads onto keyholes in back
of the unit.
5.6 Test alarm using the TEST/SILENCE buon, if the tesng
alarm is ok, means the product can work normally.
WARNING! Use only the baery specified. Use of different
baery may have a detrimental effect on the CO alarm. A good
safety measure is to replace the baery at least once a year.
CAUTION: Please replace new 2pcs same type baeries in the
meanme.
CAUTION: Test the alarm for correct operaon using the
TEST/SILENCE buon, whenever the baery is replaced!
6. GENERAL MAINTENANCE
To keep your CO alarm in good working order, please follow
these simple steps:
6.1 Verify the unit's alarm sound and indicators operaon by
enable the TEST/SILENCE buon once a week.
6.2 Remove the unit from the wall and clean the alarm cover
and vents with a so brush aachment once a month to
remove dust and dirt.
6.3 Never use detergents or other solvents to clean the unit.
6.4 Avoid spraying air fresheners, hair spray, or other aerosols
near the CO alarm.
6.5 Do not paint the unit. Paint will seal the vents and interfere
with the sensor's ability to detect CO. Never aempt to
disassemble the unit or clean inside. This acon will void
your warranty.
6.6 As soon as possible, place the CO alarm back in its proper
locaon to assure connuous protecon from carbon
monoxide poisoning.
6.7 When household cleaning supplies or similar contaminants
are used, the area should be venlated.
WARNING! The following substances can affect the sensor and
may cause false acons: methane, propane, isobutene,
isopropanol, ethylene, benzene, toluene, ethyl acetate, hydrogen
sulfide, sulfur dioxides, alcohol based products, paints, thinner,
Backside
Backside
Slide down to open baery compartment

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solvents, adhesives, hair sprays, aer shaves ,perfumes and
some cleaning agents.
WARNING! Your CO alarm will not be operaonal and will not
monitor for CO levels without baery.
WARNING! This apparatus is designed to protect individuals
from the acute effects of carbon monoxide exposure. It will not
fully safeguard individuals with specific medical condions. If in
doubt consult a medical praconer.
7. CARBON MONOXIDE (CO) OVERVIEW
7.1 Toxic effects
Carbon monoxide (CO) is a colourless, odourless, nonirritang
gas classified as a chemical asphyxiant and whose toxic acon is
a direct result of the hypoxia produced by a given exposure.
CO is rapidly absorbed through the lungs, diffuses across the
alveolar capillary membrane and is reversibly bound with
haemoglobin as carboxyhaemoglobin (COHb), however, a minute
amount is present in the plasma. The affinity of haemoglobin for
CO is over 200 mes its affinity for oxygen. This reduces the
oxygen carrying capacity of the blood, and has an effect on the
dissociaon of oxyhaemoglobin, which further reduces the
oxygen supply to the ssues. CO is chemically unchanged in the
body, and is eliminated in expired air. The eliminaon is
determined by the same factors that applied during absorpon.
The half-life while breathing room air is 2h - 6,5 h depending on
the inial COHb level. If the CO level in the inhaled air is
constant, the level of COHb in the blood will approach an
equilibrium (saturaon) state aer several hours. However, the
rate at which the equilibrium is reached depends on many
factors, e.g. lung venlaon rate (physical acvity) and alveolar
capillary transfer, cardiac parameters, blood haemoglobin
concentraon, barometric pressure, oxygen and carbon dioxide
concentraon in the inhaled air, but the two most important
factors in determining the COHb level are the CO concentraon
andthe duraon of exposure.
The effects of different saturaon blood COHb levels
on healthy adults
% COHb Effects
0.3 – 0.7 Normal range in non-smokers due to endogenous
CO producon
0.7 – 2.9 No proven physiological changes
2.9 – 4.5 Cardio-vascular changes in cardiac paents
4 – 6 Usual values observed in smokers, impairment in
psychomotor tests
7 – 10 Cardio-vascular changes in non-cardiac paents
(increased cardiac output and coronary blood flow)
10 – 20 Slight headache, weakness, potenal burden
on foetus
20 – 30 Severe headache, nausea, impairment in limb
movements
30 – 40 Severe headache, irritability, confusion, impairment
in visual acuity, nausea, muscular weakness,
dizziness
40 – 50 Convulsions and unconsciousness
60 – 70 Coma, collapse, death
Source: U.S. Environmental Protecon Agency 1984
The relaonship between the CO concentraon and the duraon
of exposure can be calculated for a given %COHb, by
parameterising the above factors.
7.2 Chronic effects on high risk groups
Individuals with coronary artery disease exposed to lowlevels of
CO show reduced ability to exercise and the me of onset of
exercise-induced angina pectoris in such paents exposed to low
levels of CO is reduced. Carbon monoxide readily crosses the
placental barrier and may endanger the normal development of
the foetus. A number of high-risk groups are parcularly
sensive to the effects of CO because of various organ
impairments or specific changes, mainly:
a) those whose oxygen carrying capacity is decreased due to
anaemia or other haemoglobin disorders;
b) those with increased oxygen needs such as those
encountered in fever, hyperthyroidism or pregnancy;
c) those with systemic hypoxia due to respiratory insufficiency;
d) those with heart disease and any vascular insufficiency.
WHO guidance states that in order to protect non-smoking,
middle-aged and elderly populaon groups with documented or
latent coronary artery disease from acute ischaemic heart
aacks, and to protect the foetuses of non-smoking pregnant
women from untoward hypoxic effects, a COHb level of 2.5%
should not be exceeded. The following WHO guideline values
and periods of me-weighted average exposures have been
determined in such a way that the COHb level of 2.5% is not
exceeded, even when a normal subject engages in light or
moderate exercise:
100 mg/m³ (90 ppm) for 15 min.
060 mg/m³ (50 ppm) for 30 min.
030 mg/m³ (25 ppm) for 1 h.
010 mg/m³ (10 ppm) for 8 h.
7.3 Normal COHb levels
Under normal condions, humans typically have low levels of
COHb of between 0.3% and 0.7% present within the body. These
levels are considered neither beneficial nor harmful.
7.4 Tobacco smoking
Tobacco smokers are exposed to significant concentraons of CO.
In cigaree smokers, the COHb concentraon varies between
5%-9%, while heavy cigar smokers may exceed 10%.
WARNING! Exposure to high levels of carbon monoxide can be
fatal or cause permanent damage and disabilies.
WARNING! The device may not prevent the chronic effects of
carbon monoxide exposure, and that the device will not fully
safeguard individuals at special risk.
8. SPECIFICATION
Model : CBFC28
Product standards : EN 50291-1:2018
Type of apparatus : Type B
Power Supply : 3V (2pcs AA alkaline baery)
Recommend baery type : GP GN15A or ENERGIZER E91
(The normal service life is 3years)
Sensor Type : Electrochemical
Product life : 10 years aer manufacture
Standby Current : <20μA (average)
Alarm Current : <50mA (average)
Operaon Ambient
Condion : -10 ~ +45°C, 25 ~ 95%RH
Storage/Transport
Ambient Condion : -20 ~ +50°C, 10 ~95%RH
Alarm sound : ≥85DB at 3m
Low Baery warning silence : about 9 hours
Installaon Locaon : wall
Detecon range : Max. 40 m2 within a room.
Size : 120*80*37 ± 1mm
Weight : 102 ± 5g (net)
NOTE: This CO alarm is designed to detect carbon monoxide gas
from any source of combuson. It is not designed to detect any
other gas.