CHARNWOOD
SLX20 Multi-Fuel
Roomheater
Operating
and
Installation Instructions
Bishops Way, Newport, Isle of Wight, PO30 5WS, U.K.
Tel: +44(0)1983 537799 Fax: +44(0)1983 537788
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OPERATING INSTRUCTIONS FOR THE
CHARNWOOD SLX20
GENERAL POINTS
PETROLEUM COKE IS NOT SUITABLE FOR USE ON
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 of 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 the installation to
clear any soot falls which may have occurred due to the
difference in combustion between the appliance and the
open fire.
THIS APPLIANCE, ITS USE WILL INVALIDATE THE
GUARANTEE
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 or an approved fuel distributor to suggest
an alternative, or ring the Solid Fuel Association Helpline on
Freephone 0800 600 000.
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.
FUELS
The following smokeless fuels are suitable for use on this
appliance:
Ancit (Phurnacite Plus),
Anthracite Large Nuts,
Centurion,
Cosycoke,
Extracite,
Maxibrite,
Phurnacite,
Welsh Dry Steam Coal (large Nuts)
Turn handle
clockwise to open
Thermostat Control Knob
The above fuels are all suitable for use in smoke control
areas. In other areas the following fuels may also be burnt:
Thermostat flap (behind side panel)
COAL
Housecoal Doubles, Trebles or cobbles may all be burnt. Do
not use singles, small nuts, or coal dust. It is important that
the large size coal is used (i.e. Larger than 2” or 50mm in
size).
Airwash Control
pull to open
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”
Wood
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 preferably two years Before use.
PEAT
Ensure that the peat is well dried before use. Burning wet
peat will give rise to heavy tar deposits and reduce outputs.
Fig. 1. Controls
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DOOR OPERATION
The doors are opened by raising the door handle as shown
in Fig. 1.Whenthefireisalight,avoidtouchingthedoors
other than on the knobs as the metal will become hot.
When closing the doors do not use excessive force.
MULTIFUEL GRATE
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 up until the tool is vertical. The grate is put
into the solid fuel position by moving the tool down until the
tool is horizontal.
Tool to be
Vertical
For Wood
Or Peat
Do Not Go Beyond
45° Position
When Riddling
Riddle Between
Horizontal &
45° Positions
Tool To Be
Horizontal
For Solid Fuel
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 position.
LIGHTING
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 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 thermostat to the required level.
Fig. 2. Grate Operation
RUNNING THE FIREWITHTHE
DOORS OPEN
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 well ventilated.
The fire may be run with the doors open if desired although
this will result in a reduction in efficiency and hence output.
The more reactive fuels, like homefire, will burn better
when the doors are left open than fuels like phurnacite and
ancit.
Before relighting the fire, riddle, remove any clinker from
the firebed and empty the ashpan.
For safety reasons, if the fire is to be left unattended with
the doors left open then use a spark guard which complies
to BS 3248.
CONTROLLING THE FIRE
The rate of burning and hence the output is controlled by
the control knob on the left hand side of the appliance and
the airwash control on the right, shown in fig. 1. Use the
control knob on the left to control the heat output from the
fire and keep the airwash control slightly open most of the
time to keep the glass clean. It will not be possible to keep
the glass clean if the ashwash control is fully closed,
particularly after refuelling. The number at the top of the
control knob is the number at which it is set, the higher the
number the faster the burning rate.
ASH CLEARANCE
The ashpan should be emptied regularly before it comes too
full. The most convenient time to remove the ash is just
before riddling the fire since the ash will be at it’s coolest.
Use the ashpan/riddling tool provided to remove the
ashpan, the fold up carrying handle should be held with a
heat proof glove.
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 spillage fuel or ash.
Care should be taken to ensure that the ash is cool before
emptying it into plastic liners or bins.
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THROAT PLATE AND FLUEWAY
CLEANING
To make ash removal easier there is a special Charnwood
ash carrier available. This may be purchased from you
supplier or, in case of difficulty, from ourselves.
It is important that the throat plate and all the appliance
flueways are kept clean. When burning smokeless fuels they
should be cleaned at least monthly. When burning other
fuels they should be cleaned once a week, and more
frequently if found necessary.
RIDDLING
Riddling twice a day is usually sufficient.
The fire should be riddled with the doors shut. Place the
tool on the knob and rotate between the horizontal and the
45° position several times as shown in Fig. 2.
The throat plate and flue ways may be cleaned with a low
fire still burning. Use the scraper tool to scrape any sooty
deposits off the front of the plate until they drop into the
fire.
Caution: when riddling the grate using solid fuel do not go
beyond the 45° position as this can cause the grate to jam.
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.
If jamming does occur then the fire should be allowed to
burn for approximately half an hour before riddling the
grate again as described above.
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.
SPECIAL POINTSWHENBURNING
COAL
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).
When burning housecoal keep the airwash control at least
sightly open all the time (refer to Fig. 1.)
When loading the appliance take care not to smother the
fire, instead fill the firebox in two stages waiting for the
flames to appear above the fire.
REFUELLING
Keep the firebox well filled (the fuel may be sloped up from
the front fire bars), but not to allow the fuel to spill over the
top of the front fire bars. Take care, especially when
burning wood, that the fuel does not project over the front
fire bars or damage to the glass may be caused when the
doors are closed.
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 a long
periods. It is therefore vital to clean the throat plate
regularly, weekly cleaning is recommended.
OVERNIGHT BURNING
Empty the ashpan, if necessary, and then riddle the fire if
you are burning solid fuel. If the fire is very low then it may
be necessary to add a little fuel and turn the thermostat
control up to maximum for a brief period until the fire is
burning brightly before filling with fuel. When burning
wood use large logs overnight as they will burn more slowly
than small ones.
CLEANING AND MAINTENANCE
Cleaning
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.
Some experimentation may be necessary to find the 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.
Cleaning the Glass
The glass in the doors is a special ceramic glass which is able
to withstand high temperatures. 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 on the glass 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.
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
to maximum. When the fire is burning well load more fuel
as necessary and turn the control knob to the desired
setting.
When burning wood do not riddle but simply set the air
controls to maximum until the fire picks up and then set
them at the required setting and refuel as necessary.
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When not in use
b) the thermostat knob is turned down to the minimum
setting and the airwash is closed,
c) the air inlet damper is closed (at the bottom left of the
appliance, see Fig. 1.) 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 condition.
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.
Spraying the inside of the doors and firebox with a light oil,
such as WD40, will also help to keep all internal parts
working well.
Over-Firing
If the fire is over- firing it will cause premature failure of the
internal fire parts. Overfiring is occurring when any internal
parts of the fire begin to glow red. To prevent over-firing
ensure that:
Door Seals
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.
Servicing
It is recommended that the fire is serviced once a year to
keep it in first class working order. After cleaning out the
firebox thoroughly, check that all internal parts are in good
working order, replacing any parts that are beginning to
show signs of wear. Check that the door seals are in good
condition and that the doors seal correctly. Check the
operation of the thermostat, both when cold and hot. A
servicing guide, TIS 48. is available on request.
a) the door seals are kept in good condition, and that the
doors are sealing correctly,
b) the thermostat on the fire is working correctly,
c) a suitable fuel is being used.
Fume Emission
Warning Note: Properly installed and operated this
appliance will not emit fumes. Occasional fume from de-
ashing and re-fueling may occur. Persistent fume emission
is potentially dangerous and must not be tolerated. If
fume emission does persist then take the following
immediate actions should be taken:
CHIMNEY SWEEPING
a) Open the 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 advise.
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.
The most common cause of fume emission is flueway or
chimney blockage. For you own safety these must be kept
clean.
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 must be cleaned with a flue brush.
Freezing
If a boiler is fitted do not light the fire if there is any
possibility that any parts of the system may be frozen.
After cleaning any soot from within the fire, replace the
throat plate and the front firebars.
Chimney fires
If the chimney is thoroughly and regularly swept, chimney
fires should not occur. However, if a chimney fire does
occur then turn the control knob to the minimum setting
(see Fig. 1), 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 should be called immediately.
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 guide wheel is
recommended. For prefabricated insulated chimneys the
manufacturers instructions with regard to sweeping should
be consulted.
TROUBLE SHOOTING
Fire Will Not Burn.
After a chimney fire the chimney should be carefully
examined for any damage. Expert advise should be sought if
necessary.
Check that:
a) the air inlet is not obstructed in any way,
b) chimneys and flueways are clear,
c) a suitable fuel is being used,
d) there is an adequate air supply into the room,
e) an extractor fan is not fitted in the same room as the fire.
Door Glass Backs Up
Differences in chimney draughts mean that the best setting
of the air controls will vary for different installations. A
certain amount of experimentation may be required,
however the following points should be noted and with a
little care should enable the glass to be kept clean in most
situations:
Fire Blazing Out Of Control.
Check that:
a) the doors are tightly closed,
a) The airwash relies on a supply of heated air to keep the
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glass clean, therefore, when lighting the stove allow the
firebed to become well established before turning the
thermostat down. It may sometimes be beneficial to also
keep the doors slightly ajar whilst the fire becomes
established. This can also apply when re-fuelling.
b) When re-fuelling keep the fuel back a little from the front
firebars, do not try to fit too much fuel into the firebox.
c) Never completely clse the airwash control - as a guide it
should be at least a quarter open.
It is always more difficult to keep the glass clean when
running the stove very slowly for long periods.
If blackening of the glass still occurs check that all flue
connections are well sealed. It is also important that the
chimney draw is sufficient and that it is not affected by
down-draught.Whenthechimneyis warm a draught
reading of at least 2.5mm (0.10 inches) water gauge should
be obtained.
d) Wet wood or logs overhanging the front firebars will
cause the glass to blacken.
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INSTALLATION INSTRUCTIONS FOR THE
CHARNWOOD SLX20
checked, it must be in good condition, free from cracks and
HEALTH AND SAFETY
PRECAUTIONS
blockages, and should not have a 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 found necessary to line the chimney then a lining
suitable for Solid Fuel must be used.
WARNING please take care when installing the appliance
that the requirements of the Health and Safety at Work Act
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 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
If there is a possibility of disturbing any asbestos in the
course of installation then please use appropriate
equipment.
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.
There must not be an extractor fan in the same room as the
appliance as this can cause the appliance to emit fumes into
the room.
If it is found there is excessive draw in the chimney then a
draught stabiliser should be fitted.
There must be an adequate air supply to 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.
HEARTH AND FIRE
SURROUND
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
chimney must be observed.
The appliance must be installed on a fireproof hearth and
must be situated at least 300mm (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
300mm (12 inches) and to the sides by at least 150mm (6
inches). If in doubt as to the positioning of the appliance
expert advise should be sought either from the supplier or
the local building inspector.
PERFORMANCE
The rated output for the SLX20 is 5.4 kW (18500btu/h) to
the room.
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.
This is the output obtained burning smokeless fuel with the
doors closed over a 4 hourly re-fueling interval.
There is an optional add-in domestic hot water boiler
available with an output of 2.0 kW (6800 btu/h). If this is
fitted then the output to the room will be reduced by a
corresponding amount.
CHIMNEY
In order for the appliance to perform satisfactorily the
chimney height must not be less than 4 metres measured
from the outlet of the fire to the top of the chimney. The
chimney should preferably be 175mm (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) INTERNAL DIAMETER OR 150 x
150MM INTERNAL SQUARE.
PREPARATION OF THE FIREPLACE
Before fitting the appliance into an existing fireplace remove
the fire back and any loose in-fill material.
The surround and opening for the appliance must conform
with Figs. 3. The flat area around the opening must be a
minimum of 750mm wide and 660mm high. Ensure that the
hearth and the base in the opening are flat, level, and at
If an existing chimney is to be used it must be swept and
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the open vent.
If an indirect cylinder is used then the primary circuit should
be filled with a suitable inhibitor to prevent the build up of
scale and corrosion.
The shaded area on the face of
the surround is the minimum flat
area required.
750 mm
FITTING THE
OPTIONAL ADD-IN
BOILER
B
660 mm
A
The boiler replaces the rear firebrick and is reversible so
that the 1” B.S.P. male tappings may come on either the left
or the right hand side of the boiler.
Dim. A:
Max. 470mm (18 1/2")
Min. 405mm (16")
Dim. B:
Max. 575mm (22 2/3")
Min. 555mm (21 3/4")
The boiler tappings protrude from the sides of the appliance
and it will therefore be necessary to fit the boiler into the
appliance after positioning the appliance in the fireplace if
the fire surround is already fitted.
Fig. 3. Limiting Dimensions Of
Surround And Opening
Before fitting the boiler, remove the front firebars, the side
and back fire plates and the firebricks. Knock out the knock-
outs for the boiler tappings on the appropriate side of the
firebox.
right angles to the surround.
Make a hole in the font of the chimney breast to give access
for infilling and fixing the flue pipe. If the optional boiler is
to be fitted it will also be necessary to make a hole in the
side of the chimney breast to give access for the pipework.
Remove the backnuts and fibre washers from the boiler
tappings and fit the boiler into the appliance. Place the fibre
washers over the tappings on the outside of the appliance
and fit the backnuts, ensuring that the boiler is held tightly
against the rear inside face of the appliance and that the top
edge of the boiler is level or runs uphill to the flow tapping.
FITTING THE FIRE
In some cases it may be necessary to place the connecting
flue pipe in the chimney before fitting the fire into the
fireplace.
When re-fitting the firebricks, note that the short side
firebrick supplied with the boiler must be fitted on the same
side as the boiler tappings. One of the original sidebricks is
fitted on the other side, and the rear brick is discarded. The
firebricks are held in position by the retaining brackets.
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 surround.
Remove any excess fire cement from around the sealing
flange.
The appliance should be screwed to the hearth through the
22mm Open Vents
Feed and Expansion Tank
Cold Water Tank
holes at the base of the sealing flange.
Overflow
Overflow
HOT WATER SYSTEM
Domestic Hot Water Draw Off
The optional add-in boiler which may be fitted in the
appliance has an output sufficient for domestic hot water
heating. If the boiler is fitted then the room heating will be
reduced.
Drain Cock
Indirect Hot Water Cylinder
The hot water system should be a gravity circuit and must
be correctly vented as shown in Fig. 4.
A double feed indirect hot water storage cylinder to
BS:1566 part 1 should be used in most situations, unless the
appliance is to be fitted in a soft water area in which case a
direct hot water cylinder may be used provided that the
boiler is stainless steel.
Drain Cock at Lowest Point
All pipework in the primary circuit must be 28mm diameter
and the flow pipe must rise continuously from the boiler to
Fig. 4. Typical Gravity Hot Water System
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Replace the back fireplate, the side fireplates, the front
firebar and the throat plate.
Flaunching
Connect the boiler to the heating system ensuring that the
flow pipe rises from the boiler. Fill the system with water
and check for leaks.
Take Flue Pipe
Up To Narrowest
Part Of Chimney.
FLUE CONNECTION
AND INFILLING
150° Elbow
Part No. 010/AV12
Make the flue connection with the special 150° elbow, Part
No. 010/AV12. Please note that this item is ordered
separately from the appliance. The legs of the elbow may be
cut on site to suit the chimney. Also note that the legs of the
elbow are different lengths to enable some situations to be
catered for by turning the elbow around.
Vermiculite
Infill
150°
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.
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 to one volume of portland
cement throughly mixed together. Enough water should be
added so that no more than one or two drops of water are
released when a handful ofmixture is squeezed.
Fig. 5. Typical Installation
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.
Flap Just Closed With
Knob Set To Minimum
Make good hole(s) in the chimney breast making sure that it
is completely airtight. A typical installation is shown in fig. 5.
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 provided.
The free inset method of installation may be used instead of
infilling. Details are available on request.
THERMOSTAT
Before lighting the fire check the cold setting distance of the
thermostat.
Locking Nut
Thermostat Flap
With the control knob at the minimum setting the flap
should be just closed as shown in Fig. 6. 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 turned.
Fig. 6. Thermostat Setting
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ASSEMBLY
Fit the side panels and the hood onto the appliance.
Instructions for this are enclosed with the panel pack.
Replace any internal parts previously removed.
PRE LIGHTING
CHECK
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.
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.
COMMISSIONING
On completion of the installation and after allowing time for
the fire cement and mortar to dry out, the fire should be lit
and checked to ensure that the 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 appliance.
Knock outs for optional boiler
either side
150°
394
156
i/d
84
547
608
506
405
265
199
260
147
170
548
SLX20 Dimensions
(All dimensions are in mm)
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