Charnwood SLX45 MKII MULTI-FUEL Product guide

SLX45
MULTI-FUEL
Operating & Installation Instructions
charnwood
®

CONTENTS
OPERATING INSTRUCTIONS
General points
Fuel
Door Operation
Controlling The Fire
Running With The Doors Open
System Controls
Refuelling
Overnight Burning
Throat Plate & Flueway Clearing
Maintenance
Chimney Sweeping
Trouble Shooting
Health & Safety Precautions
Performance
Chimney
Hearth
Preparation of the Fireplace
Fitting the Fire
Flue Connections & Infilling
Thermostat
Assembly
Pre Lighting Check
Commissioning
Dimensions
Parts Lists
3
3
4
4
5
5
6
7
9
9
10
11
12
12
13
13
14
15
INSTALLATION INSTRUCTIONS
3
3
4
4
5
5
6
9
10
10
11
12
Lighting
Ash Clearance
Riddling
Central Heating
System Controls
SLX45
MULTI-FUEL
Ref. SLX45 09.00

®
charnwood
OPERATING INSTRUCTIONS SLX45
MULTI-FUEL
3
GENERAL POINTS
FUELS
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 smokeless fuels are all suitable for use on
thiappliance:
Ancit (Phurnacite Plus),
Anthracite Large Nuts,
Centurion, Cosycoke,
Extracite,
Maxibrite,
Phurnacite,
WelshDrySteamCoal(LargeNuts).
The above fuels are all suitable for use in smoke control areas.
In other areas the following fuels may also be burnt:
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(i.e. larger than 2" or 50mm in size).
The coal should be dry.
Coal
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.
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.
The doors are opened by raising the door handle as shown in
Fig. 1. When the fire is alight, avoid touching the doors
other than on the knobs as the metal will become hot. When
closing the doors do not use excessive force.
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 thermostat to the required level. On initial
lighting, the fire may smoke and give off an odour as the
Wood
Peat
DOOR OPERATION
LIGHTING
PETROLEUM COKE IS NOT SUITABLE FOR USE ON
THIS APPLIANCE, ITS USE WILL INVALIDATE THE
GUARANTEE

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 boiler
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.
The thermostat also controls the airwash air which will keep
the glass clear of deposits and also give a cleaner burn when
using wood and coal. There is a thermostat bypass (shown in
Fig. 3.) which will help to keep the glass clean when the fire is
slumbering. This will need to be set to suit the chimney
conditions.
CONTROLLING THE FIRE
For correct firing we recommend the use of a stove pipe
thermometer which may be purchased from your supplier or from
ourselves.
RUNNING THE FIRE WITH THE DOORS
OPEN
SYSTEM CONTROLS
ASH CLEARANCE
The fire may be run with the doors open if desired although
this will result in a reduction in efficiency and hence heat
output, particularly to the boiler. The more reactive fuels, like
Homefire, will burn better when the doors are open than
fuels like Phurnacite 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.
The heating system controls may consist of time switches,
room thermostats, outdoor temperature thermostats and
thermostatic radiator valves in virtually any combination.
These will work in conjunction with the thermostat control
on the appliance. The thermostat on the appliance will simply
control the temperature of the water coming from the boiler
and hence the temperature of the radiators and domestic hot
water. The automatic controls (other than thermostatic
radiator valves) will switch the pump (and hence the
radiators) on and off. Your installer will be able to explain the
controls fitted to your system and how to operate them.
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 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 spilled fuel or ash.
Care should be taken to ensure that ash is cool before
Fig. 1. Controls
Turn handle
clockwise to open
Thermostat control
Thermostat flap (behind side panel)
Thermostat bypass
1
2
3
4
5
0
®
charnwood
OPERATING INSTRUCTIONS SLX45
MULTI-FUEL
4

emptying it into plastic liners or bins.
To make ash removal easier there is a special
available. This may be purchased from your supplier
or, in case of difficulty, from ourselves.
Riddling twice a day is usually sufficient.
The fire should be riddled with all doors shut. Place the tool
on the knob and rotate between the horizontal and the 45°
position several times as shown in Fig. 2.
Caution: when riddling the grate using solid fuel do not go
beyond the 45° position as this can cause the grate to jam.
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
Charnwood ash
carrier
RIDDLING
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
position (the tool should be horizontal).
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 that fuel does not project
over the front fire bars or damage to the glass may be caused
when the doors are closed.
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 to maximum for a brief period
until the fire is burning brightly before filling with fuel.
If the central heating pump is off overnight then the
thermostat may be left at the same setting for both day and
night operation. If the central heating pump is on overnight
then set the thermostat control to give the required level of
heating.
Some experimentation may be necessary to find the setting
most suitable for the particular fuel used and the draw on the
chimney.
For overnight burning the fire doors must be closed.
To revive the fire, empty the ashpan if necessary, riddle, and
turn the thermostat control knob to maximum. When the fire
is burning well load on more fuel as necessary and turn the
control knob to the desired setting.
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 and more frequently if it is
REFUELLING
OVERNIGHT BURNING
THROAT PLATE AND
FLUEWAY CLEANING
For Wood
Do Not Go Beyond
45° Position
When Riddling
Riddle Between
Horizontal &
45° Positions
Tool To Be
Horizontal
For Solid Fuel
Vertical
Tool to be
Or Peat
Fig. 2. Grate Operation
®
charnwood
OPERATING INSTRUCTIONS SLX45
MULTI-FUEL
5

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 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.
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.
MAINTENANCE
Cleaning
Cleaning the Glass
When not in use
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.
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.
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 doors 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.
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 brush.
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
Door Seals
Servicing
CHIMNEY SWEEPING
®
charnwood
OPERATING INSTRUCTIONS SLX45
MULTI-FUEL
6

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.
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.
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, 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 over-fired 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:
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,
TROUBLE SHOOTING
Fire Will Not Burn
Fire Blazing Out Of Control
Over-Firing
d) the fire is not fitted onto a heating system which is too
large.
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.
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.
Fume Emission
Freezing
Chimney Fires
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.
®
charnwood
OPERATING INSTRUCTIONS SLX45
MULTI-FUEL
7

After a chimney fire the chimney should be carefully examined
for any damage. Expert advice should be sought if necessary.
Check that:
a) the fire is burning properly - if not then carry out the
checks under "Fire Will Not Burn".
b) the throat plate is fitted correctly, I.e. pushed back against
the boiler, and that it Is not distorted.
c) the door seals are in good condition.
d) If the hot water goes cold when the pump is turned on, or
if some radiators are hotter than others, then the system may
need balancing, the pump may be pumping the water too
quickly around the system, or the radiators may need
bleeding. Please ask your installer to check these points.
Differences in chimney draughts mean that the best settings 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:
a) The airwash relies on a supply of heated air to keep the
glass clean, therefore, when lighting the stove allow the
firebed to become well established before turning the
thermostat down. This may also be necessary when re-fuelling
the stove.
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) If the glass regularly blacks up when the fire is slumbering
then the thermostat bypass should be opened slightly. After
adjusting ensure that the fire will still close down sufficiently
for overnight burning.
It is always more difficult to keep the glass clean when running
the stove very slowly for long periods.
Lack of Heat To Radiators / Hot Water
Door Glass Blacks Up
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. When the chimney is warm a draught reading of at
least 2.5 mm (0.10 inches) water gauge should be obtained.
Thermostat
bypass flap
Thermostat
flap
Swing down to open
Fig. 3. Thermostat Bypass
®
charnwood
OPERATING INSTRUCTIONS SLX45
MULTI-FUEL
8

HEALTH AND SAFETY PRECAUTIONS
PERFORMANCE
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 room.
There must be an adequate air supply into the room in which
the appliance is installed totalling at least 100 cm (16 in. ) to
provide combustion air. This is particularly necessary if the
room is double glazed.
Do not light the fire before the boiler has been connected to
the system and filled with water, as this can cause serious
damage to the boiler.
In addition to these instructions the requirements of BS:8303
and BS:6461 Pt 1&2; 1984 must be fulfilled. Local Authority
Bylaws and Building Regulations regarding the installation of
Solid Fuel burning appliances, flues and chimneys must also be
observed.
The rated output for the Charnwood SLX is 9.4 kW (32,000
btu/h) to water and 3.5 kW (11,900 btu/h) to the room.
These are the outputs obtained during the standard test
burning smokeless fuel with the doors closed over a 4 hourly
re-fuelling interval.
The heat output to the room is directly proportional to the
heat output to water as shown in Fig. 4. This means that if the
22
water heating load is less than the rated output then the room
heating will be reduced by the same proportion. This must be
borne in mind when calculating the heating requirements.
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
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
CHIMNEY
MUST NOT BE LESS
THAN 150mm (6 INCHES) INTERNAL DIAMETER OR
150 x 150mm INTERNAL SQUARE.
®
charnwood
INSTALLATION INSTRUCTIONS SLX45
MULTI-FUEL
0
2.0
4.0
6.0
8.0
10.0
12.0
1.0 2.0
Boiler
Output
(kW)
Space Output (kW)
Fig. 4. Performance Chart
3.0
9

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.
Before fitting the appliance into an existing fireplace remove
the fireback and any loose in-fill material.
The surround and opening for the appliance must conform
with Figs. 5. The flat area around 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 two holes in the chimney breast, one in the front to give
access for infilling and fixing the flue pipe, and one in the side
to give access for the pipework.
The central heating system must comply with BS:5449 part 1.
HEARTH
PREPARATION OF FIREPLACE
CENTRAL HEATING SYSTEM
If the system is to be a combined heating and domestic hot
water system then a double feed indirect hot water storage
cylinder to BS:1566 part 1 should be used. In order to
prevent the build up of scale and corrosion a suitableinhibitor
should be used. The system must be correctly vented as
shown in Figs. 6 and 7. The height differential between the
header tank and the appliance must not exceed 15.2 metres
(50 feet).
If all four boiler tappings are used then, if possible, diagonal
pairs should be connected for domestic hot water and central
heating. Where a common return is used an injector tee must
be Incorporated into the system as shown in Fig. 8. This will
ensure that a good domestic hot water supply is maintained
when the central heating pump is operating.
The system must incorporate a gravity circuit which will
normally heat the domestic hot water and an unvalved
radiator with an output of at least 1 kW. When the appliance
is not connected to a domestic hot water system the unvalved
radiator(s) on the gravity circuit must have an output of at
least 1.25 kW. This is to prevent boiling in case of pump
failure. All pipework in the primary circuit must be 28 mm
diameter and the gravity flow pipe must rise continuously
from the boiler to the open vent. Two typical systems are
shown in Figures 6. and 7.
®
charnwood
INSTALLATION INSTRUCTIONS SLX45
MULTI-FUEL
Fig. 5. Limiting Dimensions Of Surround And Opening
A
B
Dim. A:
Dim. B:
Max. 575mm (22 2/3")
Min. 555mm (21 3/4")
Max. 470mm (18 1/2")
Min. 405mm (16")
The shaded area on the face of
the surround is the minimum flat
area required.
650 mm
650 mm
10