Firefox 12B (Boiler Model) CE V.11
This appliance must be installed by a competent person and must
comply with national building regulations and local by-laws. Unless the
installer is qualified to approve the installation, then approval must be
sought from your local building control officer. It is an offence under UK
law not to comply with this advice. After installation the appliance should
be ready for use and instruction as to use and control given.
Multi-fuel central heating stove
Installation & operating instructions. To be left with user.
This appliance is suitable for continuous use
WOOD (Moisture less than 20%)
Mean efficiency 69.6%
Heat output 13.6 KW
Output to water 7.4 KW
Output to room 6.2 KW
Mean CO at 13% O2 0.83
Mean flu gas temp 339
Flue gas mass flow 7.9 g/s
ANCIT
Mean efficiency 73.2%
Heat output 12.8 KW
Output to water 8.0 KW
Output to room 4.8 KW
Mean CO at 13% O2 0.39
Mean flue gas temp 354 C
Flue gas mass flow 7.3 g/s
Minimum ventilation requirements at 13.6 KW 748 Cm (12.02 inch)
Please note:
No extractor fans to be fitted in same room as appliance. This appliance should
not to be used in a shared flue. Safe distance from combustible materials:
Rear – 175mm
Sides – 80mm
Please read carefully the manufacturers will not accept responsibility for any fault
due to incorrect installation.
The Firefox 12B is supplied as standard with a thermostatically controlled air
supply at the rear of the stove. The stove legs require fitting to accommodate
the thermostat controls.
The position of the flue collar will be determined by the installer for either top or
rear outlet. Supplied is a half collar this fits beneath the flue collar when
installing as top connection only and acts to impinge gas flow. Note: the open
end of the half collar faces rearwards (see illustration on page 2). The half
collar is not required on rear connection.
A blanking plate will cover the outlet not used and acts as a clean out point.
No sealants are required as ceramic fibre rope seals are fitted to flue collar
and blanking plate.
Technical Specification
Assembly Instructions
Assembly Instructions – Parts List
1 FFX12003 Stove Top
2 FFX12002 Stove Base
3 FFX12004L Stove Door Left Hand
4 FFX12004R Stove Door Right Hand
5 FFX12003E Expanding Flange (not shown)
6 FFX12005 Grate Outer
7 FFX12005B Grate Inner Bars (10 pcs)
8 FFX12007F Flue Blanking Plate (not shown)
9 FFX12007 Half Collar Defuser
10 FFX12024 Air Wash Deflector Plate
11 FFX12020 Primary Air Slide (2 pcs)
12 FFX12029 Operating Tool (not shown)
13 FFX12011 Front Bar
14 FFX12010 Leg (4 pcs)
15 FFX12008 Flue Collar
16 FFX12017 Door Catch (not shown)
17 FFX12016H Door Handle Holder (2 pcs)
18 FFX12016 Door Handle (2 pcs) (not shown)
19 FFX12028 Hinge Pin (4 pcs)
20 FFX022T Knob
21 FFX022B Knob Set (2 pcs)
22 FFX12005R Grate Rocker Bar (not shown)
24 FFX12014 Ash Pan (not shown)
25 FFX12021 Air Slide Guide Plate (4 pcs)
26 FFX12023 Secondary Air Slide
27 FFX12032 Heat Shield Primary (not shown)
28 FFX12033 Heat Shield Secondary (not shown)
29 FFX12019 Glass Clip (8 pcs) (not shown)
30 FFX12012 Thermostat Assembly
31 FFX12013 Thermostat Knob
32 FFX12026 Door Seal (not shown)
33 FFX12027 Glass Seal (not shown)
34 FFX1 Heat Resistant Mitten (not shown)
35 FFX12018 Door Glass (2 pcs)
36 FFX12034 Stove Body
37 FFX12035 Front Panel
38 FFX12036 Deflector (not shown)
39 FFX12038 Grate Pivot Block (not shown)
Installation Instructions
This appliance has been extensively tested for safety and efficiency. Do not
attempt to modify it. Always use genuine parts as recommended by your
supplier. Failure to adhere to this advice could invalidate your guarantee.
This appliance must be installed in compliance with current building regulations,
local authority by-laws and European and National standards.
Site conditions will vary, a certain amount of customisation of installation will be
required.
To achieve best performance of installation refer to ‘Approval Document J’ of
building regulations for guidance.
If the installer cannot self certify the installation then your local building control
department must approve the installation.
Members of the following schemes can self certify the installation:
HETAS LTD (www.hetas.co.uk) 01462 634 721
BESCA LTD (www.Besca.org.uk) 0800 652 5533
APHC (www.aphc.co.uk) 02476 470 626
Health and safety regulations
Handling - this appliance is heavy, adequate facilities are required for site
handling .
Fire cement - do not allow fire cement to come in contact with skin as some are
caustic .
Asbestos - this appliance contains NO asbestos .
Chimney
The chimney should be checked as to conformity to building regulations; it must
be swept before installation. This will highlight any blockages or constructional
problems.
The chimney flue should not be less then 175mm diameter and not more than
230mm diameter. If square it must have an equivalent cross section.
If these requirements are not met then a suitable method of lining should be
adopted. Connection to an approved pre-fabrication flue is acceptable but
must comply with building regulations.
Installation Instructions Continued
Flue draught
Water Gauge- Minimum 1.2mm / Maximum 2.5mm
The flue draught should be checked under high output. A flue stabiliser should be
fitted if it exceeds the maximum draught. If the flue draught is too low then the
reason for this should be investigated. The performance of the appliance will be
compromised if the flue draught is out of the recommended limits.
Chimney Connection
A short length of stove pipe will be required to connect the appliance to the
chimney. There are various ways of sealing the pipe to the chimney. A register
plate is most common. The length of the stove pipe will be dictated by the
height of the register plate in the chimney opening.
The stove pipe will NOT be smaller in diameter than the manufacturers stated
outlet diameter (6 inch-150mm internal diameter), and will be made of Vitreous
Enamelled Mild Steel with nominal thickness of 1.2mm or 316 Grade Stainless Steel.
The stove pipe should not impinge on any gathers or brickwork and not be closer
than 76mm to any chimney walls.
Any changes in direction of the flue should not be less than 45 degrees; if any 90
degrees bends are required then a swept elbow or 2 x 45 degree elbows should
be used. The elbows require a clean out door at the change in direction.
Provisions must be made for access to the chimney connection i.e. soot door.
No horizontal run shall be more than the diameter of the flue outlet of the
appliance, 6 inches (150mm).
Air supply
This appliance requires – 4730mm2 (7.4 inch2) of un-obstructed free air supply.
If a draught stabilizer is fitted then the requirement is 8810mm2 (13.65inch2)
Consideration should also be made for other appliances ventilation requirements
in the same space.
Installation Instructions Continued
Clearances
The Firefox 12B can be recessed into an inglenook or fireplace but must have a
permanent free air gap of at least 150mm to the sides and top, and a minimum of
100mm at the rear. This allows access for cleaning and maintenance and free
passage of air for the thermostatically controlled air vent.
This appliance must be placed on a non-combustible hearth. This must be
constructional or at least 125mm thick and should be in accordance with current
building regulations. All walls closer than 300mm should be a minimum of 75mm
thick and be of non-combustible materials.
If this appliance is to be placed on a floor with inadequate load bearing capacity
then specialist advice must be sought on re-enforcement, e.g. load distribution
plates
The minimum distance to combustible materials is 150mm to sides and rear, and
600mm from top and stove pipe. No furniture is to be placed nearer than 900mm
from any surface of the stove or stove pipe.
Boiler System
The design and installation of the heating system will be unique to each
application. A qualified plumbing and heating engineer must be responsible for
all calculations, design and installation. The manufacturers cannot be held
responsible for any losses due to incorrect specifications of the heating system.
The stove must NOT be connected to a sealed heating system or unvented HW
cylinder. If the stove is to be linked to an existing system then a neutralizer must
be incorporated as a common link. The neutralizer will come with its own
instructions as to use.
The stove must be connected to a double feed indirect water cylinder using
28mm flow and return pipes, rising continuously from the boiler to the cylinder.
The cylinder with a heat soak radiator of at least 2kW must be positioned above
the stove.
An open cold feed and expansion cistern must be fitted with separate cold feed
and vent pipes. These pipes must be un-valved. The vent pipe should be 22mm
diameter and rise continuously from the boiler. The vent pipe can be formed in
the primary flow.
On heating and hot water installations, a semi-pumped system should be used
with gravity circulation to the hot water cylinder. One 2kW heat soak radiator
fitted will dissipate heat when central heating is switched off.
Use all four tappings when using separate gravity and pumped heating loops. The
flow and returns should be taken diagonally across opposite sides of boiler.
If only two tappings are to be used on a common flow system they should be
taken diagonally opposite and the remaining tappings should be plugged. An
injector ‘T’ should be fitted on the primary return from the circulation pump. The
gravity flow pipe should have a high limit thermostat fitted set at 90 degrees
Celsius. This will override the circulation pump control and dissipate excess heat
around the radiator circuit.
The fitment of a low limit thermostat on the return pipe from the hot water cylinder
close to the boiler is recommended. This should maintain the return water
temperature above 45 degrees Celsius preventing activation of the circulation
pump until the gravity circuit is up to temperature. It is important to fit a corrosion
inhibitor to the water system.
Typical Installation for Integral Boiler
Commissioning
On completion of installation check that all cements have hardened. A small fire
can then be lit; check there is full evacuation of smoke and fumes up the
chimney.
Ensure that the customer is instructed on the use of the appliance as well as
recommended fuels. Insist that the customer reads the instructions and fully
understands the installations.
Advise the user on the use of a fireguard which must be to BS6539 standard and
what measures to be taken if smoke or fumes are emitted from the stove.
Operating Instructions
Primary Air (Manual Control)
Primary air (the air supply under the grate) is controlled via sliding vents in the
bottom of the doors. This provides an air supply to the bed of the fire. The plus
symbol (+) indicates more air, the minus symbol (-) indicates less air. The more air
fed to the fire the hotter it will burn, however more fuel will be consumed.
Chimney performance, atmospheric conditions and fuel quality will affect
performance so practice will be required to get ideal setting of air conditions.
Secondary Air (Airwash)
Secondary air is controlled by the sliding vent above the doors. The control knob
is situated to the top right of the stove. The plus symbol (+) indicates more air, the
minus symbol (-)indicates less air. This airwash system ensures the glass is kept
clean and feeds secondary combustion air to the fire to burn off un-burnt
volatiles, reducing emissions into the chimney and the environment.
Grate
The grate is made up of fixed grate bars and sliding grate bars, these are
operated by a long cam (Rocker bar). The rocker bar passes through a hole in the
right hand side panel. The operating tool fits the flats on the end of the rocker bar.
Door glass
The glass used in the doors will resist very high temperatures, well above the
output of this appliance. The glass panels will not break with heat. The airwash
system will usually clear any soot or tar deposits on the glass panels, but if
cleaning is required then use a recommended stove glass cleaning foam. Only
clean glass when it is cold. Do not use any abrasives as this will scratch the glass
making soot and tar build-up harder to remove. To replace the glass, remove the
door by lifting off hinge pins, lay door flat and remove retaining clips. Lift out old
glass and check glass seal. Replace if necessary. Fit new glass panel and
retaining clips, tighten screws and place door back on to hinge posts.
Operating Instructions
Door handle
The door handle along with the mitten provided are operating tools. It is not
advisable to leave the door handle connected to the door as high temperatures
will be created in the handle and could cause harm if handled. Always remove
the handle using the mitten provided. Alert other users to these instructions.
De-Ashing
It is important that the stove is de-ashed regularly. The airflow through the grate
keeps it cool, adding longevity of grate life and minimising distortion.
To operate: Offer the operating tool to the riddling bar (right hand side panel
near base)and using slow positive movement riddle the grate back and forth.
The reciprocating movement will clear the grate. The grate can jam occasionally
with clinker or more often with nails and screws from used timber. Use shorter,
faster movement of the tool to dislodge. If jamming persists then the obstruction
must be removed when the stove is cold. If the grate is kept clear and
maintained it will last longer.
Notes on Wood Burning
Wood burns best on a bed of ash and it is therefore only necessary to remove
surplus ash from the grate occasionally. Burn only dry, well seasoned wood which
should have been cut, split and stacked for at least 12 months with free air
movement around the sides of the stack to enable it to dry out. Burning wet or
unseasoned wood will create tar deposits in the stove and chimney and will not
produce a satisfactory heat output. It is recommended that the moisture content
of the wood be no more than 20% for ideal combustion.
Notes on Solid Fuel Burning
Always de-ash before refuelling and do not let the ash build up to the underside
of the grate bars. Solid fuel produces ash, which if allowed to build up will stifle
the air flow through the grate and eventually cause the fire to die.
With some solid fuels a residue of burnt fuel or clinker will accumulate on the
grate. Allow the fire to go out periodically to remove this.
We cannot stress firmly enough how important it is to empty the ashpan regularly.
Air passing through the fire bed cools the grate. Distortion or burning out the
grate bars is nearly always caused by ash being allowed to build up the
underside of the grate.
Lighting The Stove
We recommend that you have two or three small fires before you operate your
stove to its maximum heat output. This is to allow the paint to cure and the
castings to relax and consolidate location. We recommend a ‘running in’
procedure after long shut downs to preserve the life of the stove. During this you
may notice an unpleasant smell. It is not toxic, but for your comfort we suggest
that during this period you leave all doors and windows open.
Operating Instructions
Lighting The Stove ...Continued
First load the fire with starting fuel i.e. paper, dry kindling timber and/or fire lighters
in the mode chosen, either wood or coal.
Light the fire at the base leaving all air controls open. Allow the fuel to reach a
steady glow and build the fire up gradually. Once you have a good fire
established across the grate bed, further fuel can be added as required.
When your fuel is well alight you can start to restrict the primary air intake. If you
are burning only wood, the primary air control can be fully closed. If you are
burning solid fuel you will require more primary air. Your stove is burning with
maximum efficiency when a bright fire is achieved using minimum air inlet.
The stove can be banked up for long periods. When burning solid fuels, de-ash
the grate using the riddling mechanism and empty the ashpan. Open air controls
and let the fire burn brightly for a short period. Refuel and close the air controls –
the exact setting required will depend on the fuel used and the chimney draw so
some practice may be necessary. To revive the fire, open the air controls until the
fire is burning brightly, de-ash if necessary (solid fuel only) and refuel. Set air
controls as required. DO NOT OVERLOAD.
Solid Fuels
We recommend the majority of approved manufactured smokeless fuels.
Household coal, which is ‘smokey’ fuel can also be used but note that different
types will give different performances. Use as an incinerator is not recommended
as fumes from plastics etc will cause pollution to the atmosphere and will damage
the stove’s internals.
Recommended fuels: seasoned logs with less than 20% moisture content, solid
fuel:- anthracite large nuts, briquette smokeless fuel i.e. Ancit, Phurnacite,
Taybrite, homefire ovals suitable for closed appliances.
PETROLEUM COKE FUELS OR HOUSEHOLD WASTE SHOULD NOT BE BURNT ON THIS APPLIANCE
Should any difficulties arise over fuel quality or suitability, consult your local
supplier or the Solid Fuel Advisory Service.
Safety Notes
FIRES CAN BE DANGEROUS
Always use a fire guard in the presence of children,the elderly of the infirm. Inform
all persons the dangers of high temperatures during operation of appliance
including the stove pipe. Use operating tools provided.
DO NOT OVER FIRE
it is possible to fire the stove beyond its design capacity. This could damage the
stove, so watch for signs of overfiring - if any part of the stove starts to glow red,
the fire is in an overfire situation and the controls should be adjusted accordingly.
Never leave the stove unattended for long periods without adjusting the controls
to a safe setting - careful air supply control should be exercised at all times.
WARNING - FUME EMISSIONS
Properly installed and operated, this appliance will not emit fumes. Occasional
fumes from de-ashing and refuelling may occur. Persistent fume emission must
not be tolerated. If fume emission does persist, then following immediate action
should be taken:
1. Open doors and windows to ventilate the room.
2. Let the fire out, or eject and safely dispose of fuel from the appliance.
3. Check for flue chimney blockage, and clean if required.
Do not attempt to relight the fire until the cause has been identified. If necessary,
seek professional advice.
DO NOT FIT AN EXTRACTOR FAN IN THE SAME ROOM AS THIS APPLIANCE
Stove Body
The stove is finished with a heat-resistant paint and this can be cleaned with a soft
brush. Do not clean whilst the stove is hot, wait until it has cooled down. The finish
can be renovated with a suitable brand of paint.
Glass Panels
Clean the glass panels when cool with a proprietary glass cleaner. Highly abrasive
substances should be avoided as these can scratch the glass and make
subsequent cleaning more difficult. Wet logs on heated glass, a badly aimed
poker or heavy slamming of the doors could crack the glass panels. The glass will
not fracture from heat.
Chimney
Check your chimney each year before starting to use your stove for the winter.
Birds may have nested in the chimney or the masonry may have cracked. Both
chimney and flue pipe must be swept at least once a year.
General Maintenance
Trouble Shooting
POOR HEAT OUTPUT
A) Stove too small for a room. Seek advise from a Qualified Heating Engineer as to
(KW) output required for room size as a guideline the volume of the room in cubic
feet divided by 500 i.e. room 15’x15’x8’ would require 3.6kw approx.
B) Chimney and/or flue pipe restricted, room ventilation restricted. On installation
these will have been checked but regular maintenance is necessary as
conditions can change i.e. soot build up, birds nesting, masonry fall, dust build up
or furniture blocking vents.
C) Poor quality fuel. Only burn dry seasoned timber, soft woods have a lower
heat output then hard woods per hour. Solid fuels vary in heat value check with
your coal merchant as to suitability.
DIRTY GLASS PANEL
A) Generally caused by poor fuel quality, see (1c)
B) Use secondary air slide (Airwash) for glass panel.
C) Fire burning to low, open air vents on stove create hot fire this may ‘burn’ glass
clean.
D) If glass requires cleaning use glass cleaner recommended by your supplier,
only use glass cleaner or cold glass. DO NOT USE any abrasives or scrapers as
these will scratch glass causing tar build up harder to remove.
UNBURNT FUEL IN FIREBOX
Insufficient air reaching fuel. Open primary air slide, this will supply combustion
air to burn fuel fully (unless it has reached a ‘point of return’). Check ash pan is
full, empty if required, grate may be blocked de-ash with riddler. Check for
jammed clinker or nails in grate when fires out and cold.
SMOKE AND FUMES ENTERING ROOM
These are very dangerous and must NOT be tolerated. Open window and allow
fire to burn out, seek expert advice immediately. DO NOT USE stove until the
problem is solved. A list of Qualified Engineers is available from
UK Solid Fuel Association
7 Swanwick Court
Alfreton
Derbyshire DE557AS
Tel- 0845-601-4406
R.o.I.
Irish National Fireplace Organisation
162 Chapel Street
Dublin
Typical Top Flue Installation using steel closure plate incorporating clean out door
for chimney sweeping.
Installation Diagrams
Typical Rear Flue Installation with clean out door.
Installation Diagrams
Typical Installation For Inglenook Fireplaces
Inglenook fireplaces can have very large bore chimneys. Check with your installer
– you may need stainless steel flexible liner for solid fuel fitting.
Installation Diagrams
Typical Installation Into In Filled Masonry Fireplaces
Installation Diagrams
IMPORTANT
Please complete and leave with the customer upon installation completion.
Appliance Commissioning Checklist
Installer Name..........................................................................................................
Company Name........................................................................................................
Address.....................................................................................................................
..................................................................................................................................
Telephone number...................................................................................................
Date installed............................................................................................................
Stove model/description..........................................................................................
Serial number...........................................................................................................
Is the flue system correct for the appliance Yes No
Flue swept for soundness test complete Yes No
Smoke test completed on installed appliance Yes No
Spillage test complete Yes No
Use of appliance and operation of controls explained Yes No
Instruction book handed to customer Yes No
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