Charnwood Roomheater Operating instructions

Charnwood Roomheater Operating instructions
Multifuel Roomheater
Installation Instructions
Bishops Way, Newport, Isle Of Wight, PO3O 5WS, U.K.
Tel: (01983) 537799 Fax: (01983) 537788
Before lighting the fire check with
the installer that the work and checks
described in the installation
instructions have been carried out
correctly and that the chimney has
been swept, is sound, and free from
any obstructions.
WARNING There must not be an
extractor fan fitted in the same room
as this appliance as this can cause the
appliance to emit smoke and fumes
into the room.
If the appliance is fitted in place of
an open fire then the chimney should
be swept one month after installation
to clear any soot falls which may
have occurred due to the difference in
combustion between the appliance
and the open fire.
When using the fire in situations
where children or infirm people are
present please use a fire guard to
prevent accidents. The fire guard
should be manufactured in
accordance with BS 6539.
The following fuels may be burnt on
this fire. Please pay careful attention
to the special points made with each
type of fuel as they will help you to
get the best from your fire. It must be
remembered that only smokeless fuels
may be burnt in smoke control areas
on this fire. If you are not sure
whether you are in a smoke control
area, then please check with your
Local Authority.
Smokeless Fuels
Ancit (Phurnacite Plus),
Anthracite Large Nuts,
Sunbrite Doubles,
Welsh Dry Steam Coal (Large Nuts).
The above fuels are all suitable for
use in smoke control areas.
Housecoal doubles, trebles or cobbles
may all be burnt. Do not use singles,
small nuts, or coal dust
It is important that large size coal is
used (ie. larger than 2” or 50 mm in
size). The coal should be dry.
When burning bituminous coal a
little extra care is needed. Please take
note of the section “Special Points
For Burning Coal”.
Only dry well seasoned wood should
be burnt on this appliance as burning
wet unseasoned wood will give rise to
heavy tar deposits. For the same
reason hard wood is better than soft
wood. Burning wet unseasoned wood
will also result in considerably
reduced outputs. The wood should be
cut and split and then left to season
in a well ventilated dry place for at
least one year but preferably two
years before use.
Ensure that the peat is well dried
before use. Burning wet peat will
give rise to heavy tar deposits and
reduced outputs.
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At first you may find it helpful to try
several fuels to find the most suitable.
If you are unable to obtain the fuel
you want ask your supplier, an
approved fuel distributor, or your
local British Coal office to suggest an
Use the spanner type tool to open and
close the doors. Turn the knob on the
right hand door anti-clockwise to
open and clockwise to close. When
closing the doors do not push on the
enamel with the tool as this can chip
the enamel, instead push the doors on
the door knobs.
There is a safety device fitted to the
fire which prevents the main doors
being closed when the ashpit door is
open. This is to prevent accidental
The sequence for opening and closing
the doors is as follows:
Open the main doors Open the ashpit
door Close the ashpit door Close the
main doors
Your Charnwood is fitted with a
multifuel grate which enables solid
fuel, wood and peat to be burned
equally effectively.
The grate has two positions. One for
solid fuel, the other for wood and
peat. When in the solid fuel position
ash can fall through the grate and
into the ashpan. When in the wood
position ash is able to build up on the
grate as is necessary for effective
wood or peat burning.
Movement of the grate from one
position to the other is effected using
the tool supplied. The grate is put
into the wood position by moving the
tool direction of the arrow `W’
(marked on the handle of the tool)
until the tool is vertical. The grate is
put into the solid fuel position by
moving the tool in the direction of
the arrow `C’ until the tool is
If a mixture of wood and solid fuel,
or peat and solid fuel, is to be burnt
then keep the grate in the solid fuel
thermostat to the required level.
On initial lighting, the fire may
smoke and give off an odour as the
silicon paint with which the firebox
is painted reacts to the heat. This is
normal and will cease after a short
time. In the meantime the room
should be kept well ventilated.
Before relighting the fire, riddle,
remove any clinker from the firebed
and empty the ashpan.
The rate of burning and hence the
output is controlled by the control
knob on the left hand side of the
appliance, shown in Fig. 1. This is
linked to a thermostat which controls
the firebox temperature. The number
at the top of the knob is the number
at which it is set. Some experimentation may be necessary to obtain the
desired heat output.
There is also a manual secondary air
control which is located at the bottom
of the right hand side panel, see Fig.
2. When the arm is pointing to the
right it is closed, when pointing
backwards it is open. This control
should be in the closed position when
burning most smokeless fuels and in
the open position when burning coal,
wood, peat, anthracite, or homefire.
Set the grate into either the wood
position or the solid fuel position as
required. Place some paper and dry
kindling wood or fire lighters on the
grate and cover with a small amount
of fuel. Turn the thermostat control
knob to the maximum setting and
light the paper or fire lighters. Close
the doors and allow the fire to burn
until the fuel is well ignited then load
with more fuel and adjust the
The fire may be run with the doors
open. This will result in a reduction
in efficiency and hence heat output.
The more reactive fuels, like
homefire, will burn better when the
doors are open than fuels like
phurnacite, sunbrite and ancit.
For safety reasons, if the fire is to be
left unattended with the doors open
then use a spark guard which
complies with BS 3248.
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The ashpan should be emptied
regularly before it becomes too full.
The most convenient time to remove
the ash is just before riddling the fire
since the ash will then be at it’s
coolest. Use the tool provided to
remove the ashpan.
Never allow the ash to accumulate in
the ashpan so that it comes in contact
with the underside of the grate as this
will seriously damage the grate bars.
Ensure that the air inlet damper is
not prevented from closing by spilled
fuel or ash.
Care should be taken to ensure that
ash is cool before emptying it into
plastic liners or bins.
To make ash removal easier there is a
special Charnwood ash carrier
available. This may be purchased
from your supplier or, in case of
difficulty, from ourselves.
When burning solid fuels riddling
twice a day is usually sufficient.
When burning wood or peat, ash
should be allowed to build up and
generally riddling every other day
will be sufficient.
The fire should be riddled with all
doors shut. Place the tool on the knob
and rotate between the horizontal and
the 45 degree position several times
as shown in Fig. 3.
If jamming does occur then the fire
should be allowed to burn for
approximately half an hour before
riddling the grate again as described
Too much riddling can result in
emptying unburnt fuel into the
ashpan and should therefore be
avoided. Clinker should regularly be
removed from the firebed.
After riddling, the grate should be
put back into the solid fuel or wood
position as required (the tool should
be horizontal for solid fuel or vertical
for wood or peat).
Keep the firebox well filled (the fuel
may be sloped up from the front
firebars), but do not allow fuel to
spill over the top of the front fire
bars. Take care, especially when
burning wood, that fuel does not
project over the front fire bars or
damage to the glass may be caused
when the doors are closed.
fire is burning well load on more fuel
as necessary and turn the thermostat
to the desired setting.
When burning wood do not riddle but
simply turn the air control to
maximum until the fire picks up and
then set the air control at the desired
setting and refuel as necessary.
It is important that the throat plate
and all the appliance flueways are
kept clean. When burning smokeless
fuels they should be cleaned monthly.
When burning other fuels they should
be cleaned at least once a week, and
more frequently if necessary.
The throat plate and flueways may be
cleaned with a low fire still burning.
Empty the ashpan, if necessary, and
then riddle the fire. If the fire is very
low then it may be necessary to add a
little fuel and turn the thermostat
control up for a brief period until the
fire is burning well before filling with
fuel. When burning wood use large
logs overnight as they will burn more
slowly than small ones.
When burning wood or peat do not
riddle all the ash into the ashpan,
keep a layer about 12 mm (1/2 inch)
thick on the grate.
Caution: when riddling the grate
using solid fuel do not go beyond the
45 degree position as this can cause
the grate to jam.
Some experimentation may be
necessary to find the thermostat
setting most suitable for the
particular fuel used and the draw on
the chimney, but generally the
thermostat should be turned down to
the minimum setting overnight.
For overnight burning the fire doors
must be closed.
To revive the fire, empty the ashpan
if necessary, riddle (when burning
solid fuel), and turn the thermostat
control knob to maximum. When the
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DX20i 11/93
Lower the throat plate using the
throat plate tool. To do this engage
the end of the tool in the throat plate
as shown in Fig.4., pull the plate
forward and then lower it. Use the
scraper tool to push any sooty
deposits up the plate until they fall
off the back and into the fire. While
the throat plate is in the lowered
position also scrape any soot deposits
from the sides and top of the firebox.
Return the throat plate to its correct
position - raise the front of the plate,
push it back and then lower it onto
the retaining lugs.
More soot will be deposited on the
throat plate and in the flueways if the
appliance is run at low levels for long
periods. If this is the case then more
frequent cleaning will be necessary.
When burning housecoal keep the
secondary air control open all the
time (refer to Fig 2.).
When loading the appliance take care
not to smother the fire, instead fill
the firebox in two stages waiting
between each stage for the flames to
appear above the fire.
After a period of slumbering always
turn the air control up to maximum
and wait until flames appear above
the fuel bed before opening the doors.
Burning coal will produce more soot
deposits than other fuels, especially if
the fire is run at low levels for long
periods. It is therefore vital to clean
the throat plate regularly, daily
cleaning is recommended.
The appliance is finished in vitreous
enamel. To clean the surfaces simply
wipe over with a dry cloth. Abrasive
pads and scouring cleaners must not
be used as these will damage the
finish. Care should be taken not to
knock the enamel with hard objects
as it will chip.
The glass in the doors is a zero
expansion ceramic glass which will
not crack due to the heat of the fire.
Before cleaning the glass open the
doors and allow them to cool. Clean
the glass using a damp cloth and then
wiping over with a dry cloth. Any
stubborn deposits may be removed
with a proprietary stove glass cleaner
or ceramic hob cleaner. Some
deposits on the glass may be burnt off
simply by running the fire at a fast
rate for a few minutes. Do not use
abrasive cleaners or pads as these can
scratch the surface which will weaken
the glass and cause premature failure.
Aerosol spray cleaners should not be
used near the appliance whilst it is
under fire.
If the fire is going to be out of use for
a long period (for instance in the
summer) then to prevent condensation, and hence corrosion, the
thermostat should be left at the
maximum setting and the main doors
left ajar. It is also advisable to sweep
the chimney and clean out the fire.
After long periods where the fire has
been out of use, the chimney and
appliance flueways should be cleaned
before lighting.
For the fire to operate correctly it is
important that the door seals are in
good condition. Check that they do
not become worn or frayed and
replace them when necessary.
The chimney should be swept at least
twice a year. In most installations it
will be possible to sweep the chimney
through the appliance.
First remove the front firebars and
the throat plate. Then sweep the
chimney ensuring that soot is
removed from all horizontal surfaces
after sweeping.
In situations where it is not possible
to sweep through the appliance the
installer will have provided
alternative means, such as a soot
door. After sweeping the chimney the
appliance flue outlet and the flue pipe
connecting the appliance to the
chimney must be cleaned with a flue
After clearing any soot from within
the fire, replace the throat plate and
the front firebars.
Different types of sweep’s brushes are
available to suit different flueways.
For standard brick chimneys a wire
centre sweep’s brush fitted with a
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DX20i 11/93
guide wheel is recommended. For
prefabricated insulated chimneys the
manufacturers instructions with
regard to sweeping should be
Fire Will Not Burn.
Check that: a) the air inlet is not
obstructed in any way, b) that
chimneys and flueways are clear, c)
that a suitable fuel is being used, d)
that there is an adequate air supply
into the room, e) that an extractor fan
is not fitted in the same room as the
Fire Blazing Out Of
Check that:
a) the doors are tightly closed,
b) the thermostat knob is turned
down to the minimum setting,
c) the air inlet damper is closed (at
the bottom left of the appliance), and
that it is not prevented from closing
completely by a piece of ash,
d) a suitable fuel is being used,
e) the door seals are in good
Fume Emission.
Warning Note: Properly installed
and operated this appliance will not
emit fumes. Occasional fume from
de-ashing and re-fuelling may
occur. Persistent fume emission is
potentially dangerous and must not
be tolerated. If fume emission does
persist then the following
immediate actions should be taken:
A) Open doors and windows to
ventilate the room.
B) Let the fire out and safely
dispose of fuel from the appliance.
C) Check for flue or chimney
blockage, and clean if required.
D) Do not attempt to relight fire
until cause of fume has been
identified, if necessary seek
professional advice.
The most common cause of fume
emission is flueway or chimney
blockage. For your own safety these
must be kept clean.
Do not light the fire if there is any
possibility that any parts of the
system may be frozen.
Chimney Fires.
If the chimney is thoroughly and
regularly swept, chimney fires should
not occur. However, if a chimney fire
does occur turn the control knob to
the minimum setting, and tightly
close the doors of the appliance. This
should cause the chimney fire to go
out in which case the control should
be kept at the minimum setting until
the fire in the appliance has gone out.
The chimney and flueways should
then be cleaned. If the chimney fire
does not go out when the above
action is taken then the fire brigade
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should be called immediately.
After a chimney fire the chimney
should be carefully examined for any
damage. Expert advice should be
sought if necessary.
WARNING Please take care when
installing the appliance that the
requirements of the Health and Safety
at Work Act 1974 are met.
Some types of fire cement are caustic
and should not be allowed to come
into contact with the skin. In case of
contact wash with plenty of water.
If there is a possibility of disturbing
any asbestos in the course of
installation then please use
appropriate protective equipment.
There must not be an extractor fan
fitted in the same room as the
appliance as this can cause the
appliance to emit fumes into the
There must be an adequate air supply
into the room in which the appliance
is installed totalling at least 100
square cm. (16 square inches) to
provide combustion air. This is
particularly necessary if the room is
double glazed.
In addition to these instructions the
requirements of BS:8303 and
BS:6461 Pt 1&2; 1984 must be
fulfilled. Local Authority Bye-laws
and Building Regulations regarding
the installation of Solid Fuel burning
appliances, flues and chimneys must
also be observed.
The rated output for the DX20i is 5.4
kW (18800 btu/h) to the room.
This is the output obtained burning
Sunbrite Doubles with the doors
closed over a 4 hourly re-fuelling
In order for the appliance to perform
satisfactorily the chimney height
must not be less than 4 metres
measured vertically from the outlet of
the fire to the top of the chimney.
The chimney should preferably be
175 mm (7 inches) or 200mm (8
inches) internal diameter or square
with sides of 175mm or 200mm
internally and MUST NOT BE LESS
THAN 150mm (6 INCHES)
If an existing chimney is to be used it
must be swept and checked, it must
be in good condition, free from
cracks and blockages, and should not
have an excessive cross sectional area
(e.g. greater than 250mm x 250mm).
If you find that the chimney is in
poor condition then expert advice
should be sought regarding the
necessity of having the chimney
lined. If it is found necessary to line
the chimney then a lining suitable for
Solid Fuel must be used.
If there is no existing chimney then a
prefabricated block chimney or a twin
walled insulated stainless steel flue to
BS:4543 can be used either internally
or externally. These chimneys must
be fitted in accordance with the
manufacturers instructions and
Building Regulations.
Single wall flue pipe is suitable for
connecting the appliance to the
chimney but is not suitable for using
for the complete chimney.
If it is found that there is excessive
draw in the chimney then a draught
stabilizer should be fitted.
The appliance must be installed on a
fireproof hearth and must be situated
at least 300 mm (12 inches) from any
combustible material. The positioning
of the appliance and the size of the
hearth are governed by building
regulations for Class 1 appliances.
These building regulations state that
the hearth must extend in front of the
appliance by at least 300 mm (12
inches) and to the sides by at least
150 mm (6 inches). If in doubt as to
the positioning of the appliance
expert advice should be sought either
from the supplier or the local
building inspector.
The fireplace must allow good
circulation of air around the
appliance, especially above it, to
ensure that maximum heat is
transferred to the room and also to
prevent the fireplace overheating. A
gap of 150mm (6 inches) each side
and 300mm (12 inches) above the
appliance should give sufficient air
circulation. If a wooden mantelpiece,
beam or surround is used in the
fireplace it should be a minimum of
460mm (18 inches), and preferably
600mm (24 inches) above the
appliance. In some situations it may
be necessary to shield the beam or
mantelpiece to protect it.
Before fitting the appliance into an
existing fireplace remove the fireback
and any loose in-fill material.
The hearth, surround and opening for
the appliance must conform with
Figs. 5 and 6. The flat area around
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DX20i 11/93
In some cases it may be necessary to
place the connecting flue pipe in the
chimney before fitting the fire into
the fireplace.
Apply fire cement to the rear face of
the sealing flange on the appliance.
Fit the appliance into the opening
ensuring that it is central and that a
good seal is made between the
sealing flange and the face of the
Remove any excess fire cement from
around the sealing flange.
The appliance should be screwed to
the hearth through the holes at the
base of the sealing flange.
Make the flue connection with a 45º
elbow and a short length of flue pipe.
Stainless steel 1.0 mm thick is
recommended. If cast iron flue pipe
is used then the optional cast iron
flue adaptor must be used.
The end of the flue pipe must line up
with the centre-line of the chimney,
and must also extend to the point
where the chimney narrows to its
final size. Any large voids must be
filled and flaunched to the flue pipe
to ensure that all soot deposits can be
cleared when the appliance is swept,
and to prevent problems with the
operation of the appliance.
Ensure that the flue pipe is not
obstructed or restricted in any way
and that all joints are well sealed.
the opening must be a minimum of
750 mm wide and 660 mm high.
Ensure that the hearth and the base
in the opening are flat, level, and at
right angles to the surround.
Make a hole in the front of the
chimney breast to give access for
infilling and fixing the flue pipe.
Before infilling cover the front of the
appliance to protect it. Ensure that
the flue pipe is central and then fill
the space between the body of the
appliance and the structural
brickwork with vermiculite (e.g.
micafil or similar) concrete. Ensure
that there are no air pockets. The
recommended mix is six volumes of
vermiculite granules to one volume of
portland cement thoroughly mixed
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DX20i 11/93
together. Enough water should be
added so that no more than one or
two drops of water are released when
a handful of the mixture is squeezed.
After filling with vermiculite flaunch
the top of the flue connector pipe to
the chimney with lime mortar.
Ensure that the flue pipe is well
sealed to the chimney.
Make good the hole in the chimney
breast making sure that it is
completely airtight. A typical
installation is shown in Fig. 7.
In most installations it will be
possible to sweep the chimney
through the appliance. If this is not
possible then some alternative means
(such as a soot door), must be
The free inset method of installation
may be used instead of infilling.
Details are available on request.
Before lighting the fire check the
cold setting distance of the
With the control knob at the
minimum setting the flap should be
just closed as shown in Fig. 8. To
adjust the distance slacken the
locking nut and adjust as necessary.
When set correctly re-tighten the
locking nut. Ensure that the flap
opens and closes freely as the knob is
Fit the side panels, hood and top grid
onto the appliance. Instructions for
this are enclosed with the panel pack.
Replace any internal parts previously
2. The plates round the sides and
back of the grate must be in position
and sitting correctly.
3. The throat plate must be fitted in
the roof of the appliance.
On completion of the installation and
after allowing a suitable period of
time for the fire cement and mortar to
dry out, the fire should be lit and
checked to ensure that smoke and
fumes are taken from the appliance
up the chimney and emitted safely.
Also check all joints and seals.
On completion of the installation and
commissioning please leave the
operating instructions with the
customer and advise on the use of the
Before initial lighting check the
following points:
1. The bottom grate bars must all be
fitted and should move freely and
easily when the riddling mechanism
is operated.
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Overall Dimensions
(Dimensions are in mm)
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