CARBON repeating series of four beeps followed by a 5 second pause. C. What are the possible symptoms of Potential sources of carbon monoxide in your
The Yellow (fault) Light – The yellow light will either flash carbon monoxide poisoning? home/office:
MONOXIDE alarm once every 60 secs (in battery mode) or be on all the time if Carbon monoxide (CO) is odourless, colourless, tasteless
a fault occurs. This will be accompanied by two short beeps
every 60 seconds. This will happen if the sensor is missing
and very toxic. When inhaled, it produces an effect known as
MANUAL •Simple Fitting
Instructions or defective or if the circuitry has developed a fault. Call our
Injury is due to the combining of CO with the available
•Location Guide help line below if this should happen.
For more information
•Operating Guide haemoglobin in the blood, which lowers the oxygen-carrying
please write to: NOTE 1: The unit will perform a self test every 4 weeks to capacity of the blood. In the presence of carbon monoxide,
•Basic Safety Tips
Dicon Safety Products •Simple verify the sensor and detection circuitry. the body is quickly affected by oxygen starvation. Clogged Wood Burning Wood or Gas
(Europe) Ltd. Maintenance Chimney Flue Stove Fireplace
P Box 402 Instructions
NOTE 2: On interconnected alarm system with more than The following symptoms are related to carbon monoxide
Gloucester one alarm, only the originating alarm will show the red light. poisoning and should be discussed with all members of the
GL2 9YB All the others will just sound the alarm. household so that they know what to look for:
Automatic sensor replacement indicator. Extreme Exposure (A-C) below. Unconsciousness,
The Automatic Sensor Replacement feature on this Carbon convulsions, cardio respiratory failure, death.
Monoxide alarm reminds you to replace the sensor after six
Medium Exposure (D-G below) Severe throbbing headache,
years by beeping three times every 60 seconds. This Car and Gas Water Gas Appliances
drowsiness, confusion, vomiting, fast heart rate
PLEASE KEEP THIS MANUAL IN A SAFE PLACE
warning will continue until the sensor is replaced. Replacing Garage Heater
the sensor will allow your alarm to be used for up to 12 Mild Exposure (H-J below) Slight headache, nausea, fatigue
BATTERY OPERATED MODELS: years. WARNING: The sensor can only be replaced once.
CO850B, CO850BS (often described as ‘flu-like’ symptoms)
Do not use your alarm for more than twelve years.
MAINS POWERED MODELS, A - 50% COHb (Permanent Brain Damage – Death)
230-240 VAC ( ), 50-60 Hz, 7W: Please phone our Technical Department on 01452 714999
CO850Mi, CO850MBXi, CO850MRLi for details on how to get your replacement sensor fitted. B - 45% COHb (Coma and Permanent Brain Damage)
BSEN 50291:2000 IMPORTANT: PLEASE READ Warning: Do not attempt to open the unit or tamper
Licence No. 57514 AND RETAIN THIS OWNERS MANUAL C - 40% COHb (Collapse) Portable Gas or Gas or Oil Cigarette Smoke
with the internal circuitry as this may result in the risk Paraffin Heater Boiler
of electric shock and/or unit malfunction. D - 35% COHb (Vomiting)
2502-A0041 When installing this alarm for use by others, please
leave this manual or a copy with the end user.
E - 30% COHb (Drowsy)
F. How can you maintain your alarm?
WARNING: APPARATUS CONFORMING TO THIS B. What to do if the alarm sounds F - 25% COHb (Headache and Nausea) An alarm is useful only if it works. The following illustration
STANDARD (BSEN50291:2001) MAY NOT PROTECT G - 20% COHb (Headache) explains proper maintenance.
PEOPLE WHO ARE AT SPECIAL RISK FROM CARBON If harmful levels of carbon monoxide are detected, your
MONOXIDE EXPOSURE BY REASON OF AGE, alarm will emit a series of four beeps followed by a short H -15% COHb (Slight Headache)
PREGNANCY OR MEDICAL CONDITION. IF IN ANY pause; this will be accompanied by a flashing red light. This
DOUBT, CONSULT YOUR MEDICAL PRACTITIONER. I - 10% COHb (None)
pattern will be repeated until the alarm is successfully reset. Test the alarm by
J - 5% COHb (None) pressing the
If the alarm is emitting a different pattern of beeps see Test /Reset button
Important: Not suitable as a smoke, fire, or combustible section A above.
gas alarm. This device is not suitable for installation in a Many cases of reported CARBON MONOXIDE POISONING once a week.
hazardous location, as classified in BSEN 60079-10:1996. If the alarm sounds, respond as follows: indicate that while the victims are aware they are not well,
they become so disorientated they are unable to exit the
1. If anyone is experiencing the effects of carbon monoxide
This Carbon Monoxide alarm shall not be seen as a building or call for assistance. Young children and
poisoning–headache, dizziness, nausea or other ‘flu-
substitute for proper servicing of fuel-burning appliances, household pets may be the first affected. Exposure during
or sweeping of chimneys, or as a substitute for either a sleep is particularly dangerous because the victim usually Vacuum the
smoke alarm or a combustible gas alarm. 2. Open the doors and windows to ventilate. does not awaken. For most people, mild symptoms outside of the
generally will be felt after several hours of exposure to 100 alarm including
3. Turn off any fuel-burning appliances where possible and the air vent on the
stop using them. ppm of carbon monoxide. Higher levels will lead to more
A. Audible and visual warnings severe symptoms or death.
front and base.
4. Evacuate the property leaving the doors and windows
Alarm sounder open.
5. Ring your gas or other fuel supplier on their emergency
D. What is carbon monoxide and why
•••• •••• •••• A repeating series of 4 should you be concerned?
beeps with red light – number. Record those numbers here:-
Carbon monoxide is a dangerous, poisonous gas. It is often
FULL ALARM Gas Supplier referred to as the Silent Killer because it has no odour or
•••• •••• •••• A repeating series of 4 taste and it can’t be seen. The presence of carbon monoxide
beeps WITHOUT LIGHTS – Corgi Engineer inhibits the blood’s capacity to transport oxygen throughout
An interconnected alarm is the body, which can eventually lead to brain damage. In any
enclosed space (home, office, recreational vehicle or boat)
in FULL ALARM
Hospital/Doctor even a small accumulation of carbon monoxide can be
••• ••• Three short beeps every dangerous. NOTE If a fault warning is shown after a manual or automatic
60 seconds – REPLACE 6. Do not re-enter the property until the alarm has stopped. self test contact our helpline on 01452 712459
SENSOR E. What are the potential sources of
7. Get medical help immediately for anyone suffering the Battery operated alarms and mains alarms with
•• •• Two short beeps every 60 effects of carbon monoxide poisoning (headache, carbon monoxide? 9V PP3 style battery back up i.e. CO850MBXi
seconds with yellow light – nausea), and advise that carbon monoxide poisoning is Although many products of combustion can cause The battery is expected to last at least 12 months.
FAULT suspected. discomfort and adverse health effects, it is carbon monoxide
8. Do not use the fuel-burning appliances again until they (CO) that presents the greatest threat to life. CO is produced Changing the battery.
• • A single beep every minute
have been checked by an expert. In the case of gas by the incomplete combustion of fossil fuels such as natural On battery powered units or mains units with a replaceable
with symbol on digital
appliances this must be a CORGI registered installer. gas, propane, heating oil, paraffin, coal, charcoal, petrol or battery backup the alarm will beep once every minute and
display – LOW BATTERY wood. The incomplete combustion of fossil fuel can occur in display a battery symbol on the digital display (if fitted).
9. If no symptoms exist, operate the Test/Reset button and
•••• •••• Two sets of four beeps with any device that depends on burning for energy or heat such If this happens change the battery as follows:-
immediately ventilate the home by opening the windows as gas fires, central heating boilers, room heaters, water
red Light – WHEN TESTED and doors. • WARNING: Battery replacement should only be done by a
WITH TEST BUTTON heaters, cookers or grills and in any petrol-powered vehicle
10. The alarm can be silenced by pressing the Test/Reset or engine (e.g. generator set or lawnmower). Tobacco smoke
Digital display (Optional Extra) button. also adds CO to the air you breathe. • Turn off the electricity supply to the alarm.
Alarms fitted with a digital display show the levels of CO What to do after resetting the alarm When properly installed and maintained, your natural gas • Remove it from the pattress or backplate by removing the
measured by this alarm and indicate the amount of boiler and hot water heater do not pollute your air space with screws at the top and bottom of the alarm.
A full continuous alarm within six minutes after reset
carboxyhaemaglobin (COHb) that may be present in the confirms ongoing presence of harmful levels of carbon carbon monoxide. Natural gas is known as a ‘clean burning’ • Undo the screw on the battery door and remove the door
bloodstream of anyone within its detection range. monoxide. If this occurs follow instructions 2 to 8 as per fuel because under correct operating conditions the and the battery from the alarm. (see below) Replace the
By repeatedly pressing the Display button on the front of the above. combustion products are water vapour and carbon dioxide, battery with a GP 1604A, Energiser 522, Duracell
alarm you can change the information displayed to one of which are not toxic. Carbon dioxide (CO2) is also present in MN1604 or MX1604. Place the new battery inside the
What to do after a carbon monoxide problem has the air we exhale and is necessary for plant life). The battery bay and refit the door and screw removed above.
been corrected? products of combustion are vented from boilers and water
Shows CO in parts per heaters to the outside by means of a flue, duct or chimney. • Test the alarm for correct operation using the test facility
After a carbon monoxide problem has been corrected reset whenever the battery is replaced. Do this before turning
your alarm by pushing the Test/Reset button as per the Correct operation of fuel-burning equipment requires two on the main electricity supply.
following instructions. key conditions. There must be:
Shows peak level of Warning: This device will only alarm if carbon monoxide • An adequate supply of air for complete combustion.
CO (ppm) in past 12hrs is detected. If not responded to, the presence of carbon • Proper venting of the products of combustion from the
monoxide can be fatal. boiler through the chimney, vent or duct to the outside. Battery Access Door Screw
Shows calculated levels of Caution: This alarm will only indicate the presence of Typical Carbon Monoxide Problems
CO Hb. Alarm will sound at carbon monoxide at the sensor. Carbon monoxide may be 1. Equipment problems, due to defects, poor maintenance,
approximately 3.9% present in other areas. damaged or cracked heat exchangers
How to reset the alarm 2. Collapsed or blocked chimneys or flues, dislodged,
Indicator lights disconnected or damaged vents
The alarm will reset once the carbon monoxide has
dispersed. Should you wish to attempt to do a manual reset 3. Downdraught in chimneys or flues; this can also be
press the test/reset button. The unit will re-alarm if the levels caused by very long or circuitous flue runs, improper
Battery Access Door
of carbon monoxide are still hazardous. To reset after an location of flue outlets or wind conditions
Yellow – Fault
Green – Power
alarm, press the Test/Reset. 4. Improper installation or operation of equipment, chimneys G. How can you test the alarm?
Red – ALARM or vents A green power light indicates that power is supplied. (See
5. Short stays in rented accommodation (e.g. flats, holiday previous section).To test the alarm (wait at least ten minutes
cottages etc) after installing it or after power failure/switch-off), press,
Test/Reset Button hold and then release the Test/Reset button. A flashing red
6. Air tightness of house envelope resulting in a lack of air light will be accompanied by a repeating series of four
for the combustion process beeps followed by a 5 second pause. Test weekly.
7. Inadequate exhaust of space heaters or fuel-burning
The Green (power) Light – When the alarm is powered by appliances
the mains supply the green light will remain on all the time. 8. Vent fans/chimneys competing for air supply
H. A Malfunctioning unit
If your alarm is powered by battery (B) or the mains has The yellow light will either flash once every 60 secs (in
failed and your alarm has a standby battery (MRL, MBX) battery mode) or be on all the time if a fault occurs.
then the green light will blink every minute. This will be accompanied by two short beeps every 60 secs.
The Red (Alarm) Light – This light will be on if the alarm This could occur if the sensor has been removed or
is detecting carbon monoxide. It will be accompanied by a disconnected, or there has been an electronic failure. If this
happens contact our helpline.
parts of the screw slots are uppermost. O. Guarantee Information
WARNING: If the green light is off (or not flashing every Carefully offer up the alarm to the baseplate and push it into Limited Guarantee
minute in battery mode) the alarm may be without power place ensuring the clips fasten correctly.
and therefore will not indicate a fault condition. Your Dicon Alarm, excluding the battery in 850B and 850MBX
To provide maximum protection, please allow one hour for models, is warranted for six years from the date of purchase
your alarm to fully initialize after power-up. However, your against defect in material and workmanship. Units returned to
Dicon Helpline. 01452 712459 alarm will provide protection for your premises immediately. Dicon with proof of purchase.date during this period as a
For mains powered models M, MBX, MRL result of such defects will be repaired, or replaced at Dicon’s
J. Tips for the Homeowner CO This unit is designed for permanent connection to a 230- option, without charge. This warranty only covers defects in
Energy Conservation and Indoor Air Quality 240 VAC 50-60Hz supply. The maximum current draw is material or workmanship in normal residential use and does
45mA – select fuse accordingly. not cover damage resulting from negligent handling, misuse
Two steps that homeowners take to conserve energy may CO or lack of reasonable care.
adversely affect indoor air quality. Since air leakage can
Warning: Wiring should be installed only by a qualified YOUR ALARM IS NOT A SUBSTITUTE FOR PROPERTY,
account for as much as 40% of heat loss, houses are being
electrician in accordance with the current DISABILITY OR OTHER INSURANCE OF ANY KIND.
made more airtight. Reduced air leakage will contribute to
IEE Wiring Regulations for Electrical Installations APPROPRIATE COVERAGE IS YOUR RESPONSIBILITY,
higher concentrations of air contaminants from indoor CO
(BS7671). CONSULT YOUR INSURANCE AGENT.
sources and can cause draught reversal in the central
heating boiler or fireplace chimney when the demand for air This warranty does not affect a customer’s statutory rights in
by fireplaces, central heating boilers and exhaust fans Important: The circuit used to power the alarm must be any way.
exceed the air supplied by leakage area and supply ducts. a 24 hour voltage circuit that cannot be turned off by a In the event of a problem with your alarm or you have any
Converting from oil to gas, without taking steps to prevent
L. Where should you install the alarm? wall switch. It is recommended that CO alarms be wired questions concerning use and care of the product or
Which room to put the alarm? on a separate circuit (ie one with no other lights or concerning service, please consult your owners manual.
chimney deterioration, will increase the risk of chimney
appliances) to ensure maximum reliability of mains power If you require further help or clarification, please write:
blockage, draught failure and the associated release of Ideally, you should have an alarm in or near every room that supply.
combustion products into the house. You should always use has a fuel-burning appliance. However, if you have more Dicon Safety Products (Europe) Ltd.
properly qualified CORGI registered gas installers. than one appliance, but only one alarm, you should take the .O.
P Box 402
1. ELECTRICITY MUST BE TURNED OFF AT THE
following into consideration when deciding where best to GLOUCESTER
DISTRIBUTION BOARD BEFORE COMMENCING ANY
Dirt and Blockage put the alarm. GL2 9YB
WORK IN ORDER TO PREVENT ELECTRICAL SHOCK OR
Never insulate or try to seal up a draught hood, wind cap or • If there is a fuel-burning appliance in the room where you EQUIPMENT DAMAGE.
exhaust vent on any gas appliance (central heating boiler, sleep, you should put the alarm in that room. 2. Select a suitable location in accordance with the
hot water heater, cooker, dryer or space heater). Keep area PLEASE KEEP THIS MANUAL IN A SAFE PLACE
• If there is a fuel-burning appliance in the room that you guidance in section L of this manual and complying with
around appliances clean. Don’t store anything that could use a lot. e.g. a sitting room, you should put it in that the requirements set out above.
restrict air circulation close to equipment. If you have a gas Please note that specifications may be subject to change.
room. 3. Remove CO alarm from pattress by removing the small
water heater, make sure that combustion air openings at the
bottom of the tank and the opening below the draft diverter • If you live in a bed-sit put the alarm as far away from the securing screws at the top and bottom of the alarm and
(on top of the tank next to the flue duct) remain unblocked. If cooking appliances as possible, but near to the place pulling the alarm away from the pattress.
you have a gas dryer, the exhaust duct must be vented to the where you sleep. 4. Place pattress at chosen location with the connector
outside and have a hood at the end. Check that the exhaust • If the fuel-burning appliance is in a room not normally block uppermost. Mark and then drill holes for suitable
system is not blocked by lint or debris and that the flapper used (e.g. a boiler room) put the alarm just outside the fixings, corresponding to the slots in the base of the
in the hood moves freely. room so that you will be able to hear the alarm more pattress.
For all fuel-burning equipment, make sure that vent hoods easily. 5. Bring supply wires from mains into the pattress.
and pipes are not blocked by insulation, leaves or bird If the alarm is in the same room as the appliance:- N.B. The CO850 mains powered series are supplied
nests. If you have pets, make sure that there is no build up It should be mounted on or close to the ceiling at a height complete with a pattress within which wiring connections
of fur or hair around gas burners or aeration holes. greater than that of any door or window. It should be at least are made and does not therefore require a junction box. The
Using other equipment that consumes or 300mm from any wall, light fitting or any other obstruction. pattress is provided with knockouts in the base for entry
exhausts household air If mounted on a wall it should be at least 150mm from the from the back or an end port knockout for mini-trunking.
ceiling. If mounted in a room with a sloped or gabled ceiling 6. Secure pattress to mounting surface using suitable
If you use exhaust fans, a fireplace or other fuel burning
it should be at least I metre lower than the highest point of fixings.
heaters or stoves: the room as long as that is above doors and windows.
Run exhaust fans for just a minute or two. Prolonged use White Blue
If the alarm is in a room that is remote from the appliance,
could remove too much air, and it wastes heat.
then the alarm should be in the breathing zone of the
If your appliance has a conventional flue, beware of running occupants.
extraction fans when the gas appliance is on.
• An alarm should be at least 1.8 metres (6 feet) from the
When your fireplace, coal or wood stove is operating, open fuel-burning appliance.
a window and close off warm air registers in the room or
install a fresh air duct directly to the fireplace or stove so
that it won’t steal air from your central heating boiler.
Do not put a CO alarm: E
• Outside the building. Brown
Confining or enclosing gas-fired equipment
• In close proximity to a vehicle exhaust pipe; this will
If you have partitioned off your central heating boiler and damage the alarm.
water heater, you may need additional ventilation. 7. Connect the incoming live wire to the terminal marked L,
• In or below a cupboard.
Danger Signs the incoming neutral wire to the terminal marked N and
• In a damp or humid area. the incoming green and yellow earth wire into the unused
Stuffy, stale or smelly air, back draughts and soot from a • Near paint thinners, adhesives, polishes, aerosols, or terminal marked E.
fireplace or boiler chimney usually means your home needs household cleaning products. Other substances may also
more air for proper combustion and healthy living. This alarm can be interlinked to 17 other CO alarms (18 in
affect the reliability of the unit. all). To interlink to another alarm connect the incoming wire
For gas-fired equipment, mostly yellow (rather than clear • Directly above a sink or cooker. used for the interlink connection to the terminal marked I
blue) burner flames, a pilot light that keeps going out, or a The incoming wire must be rated the same as the incoming
smell of gas indicate trouble. Turn off the equipment and • Next to a door window or extractor fan or anywhere that it
would be affected by draughts. live and neutral.
contact the gas emergency service, number in the telephone
directory, under ‘Gas’. • In exhaust streams from gas engines, vents, flues or NOTE: NO connection should be made to the mains supply
chimneys. earth terminal. Simply secure the incoming earth wire at
terminal marked E to prevent contact with live neutral or
K. Additional Safety Tips • Where it would be obstructed by curtains or furniture.
Dicon CO alarms are manufactured to the highest standards • In an area where the temperature could drop below -10ºC
8. Carefully offer the alarm up to the pattress ensuring the
to ensure faultless operation and long life. or rise to above 40ºC.
connection pins locate into the sockets in the pattress.
The manufacturers do, however, recommend that no CO • Where humidity is less than 30% R.H. or more than 90%
alarm should be used for more than twelve years, in order to 9. Secure alarm to pattress using securing screws (see
minimise the chance of a fault occurring. This device point 3).
requires no special disposal procedures and may be • Where dirt or dust could block the sensor and stop it
10. Turn electricity supply back on.
disposed of in household refuse. Have your fuel-burning working.
11. The alarm will start an automatic self-test that will last
equipment checked periodically for safety and efficiency by • Where it could be easily knocked or damaged, or where it
up to 25 seconds. This will include 2 series of 4 beeps
a qualified service engineer. If you are adding a wood or could be accidentally turned off or removed.
with red light followed by a single flash of the yellow
coal burning stove to a home, make sure that the stove is
and green lights.
properly installed and vented.
Check with the Building Inspectors Department of your local M. How should you install the alarm? 12. If the alarm is interconnected to other CO alarms,
pressing the test button on one alarm will cause the
council and always use a qualified (CORGI registered) gas CO850B, CO850BS, CO850MBX (Including those with
others to sound within a few seconds. The red light will
installer. further suffixes D and i)
only show on the originating alarm.
If you have already installed a wood or coal stove without When inserting the battery for the first time remove the
building regulation approval, consult your local Building Battery Access Door (see section F) by sliding towards the Warning: This device should remain permanently
Control Officer. Some ‘do-it-yourselfers’ have unknowingly side of the alarm. Remove the battery access door screw installed. It should not be used on an intermittent
DICON is a leader in the development and
created dangerous conditions. from the body of the alarm shown in section F. Remove the basis, nor as a portable detector for the spillage of
manufacture of Carbon Monoxide, Natural Gas,
Do not expose yourself to carbon monoxide through battery from the compartment and connect it to the flying combustion products from fuel-burning appliances
Propane Gas, Smoke and Fire Alarms. Through
carelessness. Never operate a petrol engine in a confined or lead found in the compartment. ONLY USE APPROVED or chimneys.
the distribution of indoor air quality
enclosed space such as a garage or tool shed. Never use a BATTERIES, either Duracell MN1604, MX1604, GP 1604A
management products, DICON is committed to
or Energiser 522. Carefully insert the battery back into its
paraffin stove or charcoal grill in a confined space such as a
compartment, refit the access door and secure with the
N. Technical information the establishment and maintenance of a safe
closed garage or caravan. On brick chimneys inspect and and healthy home and work environment.
screw removed above. When changing the battery in future Your alarm utilizes a proprietary Electronic Sensing
clean-out regularly to ensure that the chimney is free and
remove the battery access door screw before opening the Technology that permits the unit to vary the exposure time Call our Dicon Safety Products Helpline
clear of debris.
door. Test the alarm in accordance with section G. before the alarm sounds based on carbon monoxide 01452 712459
Regardless of the fuel your boiler, fireplace or stove uses, concentrations.
your chimney should be inspected from time to time by a Mounting the battery operated alarms CO850B, Important:
CO850BS (Including those with further suffixes The carbon monoxide concentrations and time standards for
competent person. Any ‘Efficiency’ devices must always be Please read and retain this owner's manual.
D and i). the alarms are as follows:
installed by a CORGI registered installer. When using paints, When installing this alarm for use by others,
household cleaning supplies or similar materials, be sure (See section L for choosing location) please leave this manual or a copy with the end
Carbon No alarm Will alarm
that you’re using them in a well-ventilated area. Following If you are using the baseplate to mount the alarm, Monoxide before before user and ensure they are fully conversant with
sensible maintenance and safety procedures in the home 1) remove it from the back of the alarm by using a small Concentration its siting, operation and maintenance.
will give you fuel savings without endangering your health. screwdriver to lift the retaining clips away from the back
50 ppm 60 minutes 90 minutes
of the alarm.
DICON Safety Products (Europe) Ltd
2) Secure the baseplate to the chosen surface using the 100 ppm 10 minutes 40 minutes
PO Box 402 Gloucester GL2 9YB
fixings supplied being careful to ensure the narrowest 300 ppm – 3 minutes
Fax: 01452 713103