Aarrow Fires Tf 70 User Manual

Operating & Installation Manual  
Acorn  
Multifuel Stoves  
The Acorn 4 Multifuel Stove (shown above)  
PLEASE RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE  
Arada Ltd  
Rev 4  
The Fireworks  
Bridport  
Part No: AFS1126  
November 2006  
Dorset, DT6 3BE  
Great Britain  
Tel. (44) 01308 427234  
Fax. (44) 01308 423441  
CONTENTS  
INTRODUCTION  
Safety Notices  
Page  
OPERATING INSTRUCTIONS  
AirInlet Controls  
Page  
16-17  
16-17  
17  
5
5
6
7
The Principle of the Fire  
Check List  
Airwash System  
Multi-Purpose Operating Tool  
Fire Door Glass  
Technical Data  
17-18  
18  
INSTALLATION  
General Precautions  
Handling  
Page  
Adjusting the Door Hinges  
Fuel Types  
8
8
8
8
8
9
9
9
18-19  
19  
Lighting the Fire  
Hearth  
Extended Burning  
De-Ashing  
19-20  
20  
Combustible Materials  
Air For Combustion  
Firebox Liner Panels  
Removal of the Throat Plate  
Fitting the Optional Floor Fixing Kit  
Assembling the Multifuel Grate  
Flues & Chimneys  
Add in Boilers  
Over-Firing  
20  
Cleaning & Annual Maintenance  
Final Check List  
21  
22  
Parts List  
23-25  
10  
11-14  
15-16  
GUARANTEE  
Guarantee  
26  
26  
Customer Registration  
SERVICE RECORD  
Service Record  
27  
28  
Final Factory Check List  
3
WARNING  
TO ALL MULTIFUEL USERS  
PETROLEUM COKE  
SOME OF WHOSE BRAND NAMES ARE  
"CALCO", "PETROCOKE" OR "WONDERCO"  
MUST NOT BE BURNED IN THIS APPLIANCE  
TO USE THESE FUELS WILL INVALIDATE THE  
APPLIANCE GUARANTEE  
IF IN DOUBT CONTACT THE SOLID FUEL ASSOCIATION  
TELEPHONE NUMBER 0800 600 000  
THE USE OF SPARE PARTS OTHER THAN THOSE SUPPLIED  
BY Arada LTD WILL INVALIDATE THE  
APPLIANCE GUARANTEE.  
4
Acorn Multifuel Stoves  
INTRODUCTION  
Safety is the most important consideration when  
installing your fire. If not properly installed and  
operated a house fire may result. installation must  
comply with the Building Regulations and conform  
to all relevant fire safety standards.  
SAFETY  
A fireguard conforming to BS 8423: 2002 should  
be used in the presence of children and old/or  
infirm people. If the appliance is used with the fire  
door open, a spark guard conforming to BS 3248  
should be fitted.  
Aarrow produce a variety of appliances ranging  
from units, which are traditional in style to stoves  
Do not use aerosol sprays or any other flamable  
materials near the appliance under fire.  
Do not fit an extractor fan in the same room as  
the appliance.  
Fire cement is caustic, hand and eye protection  
should always be worn, prolonged contact with  
the skin should be avoided.  
which are modern in appearance, all  
with "High Tech" features.  
bristling  
Model types include simple room heaters,  
convectors, integral boiler models and inset units.  
Your Aarrow Fire is constructed from either single  
or twin wall steel strengthened where necessary.  
Cast iron is used where appropriate for decorative  
features.  
Arada Ltd will not be responsible for any conse-  
quential or incidental loss or injury  
caused.  
however  
All fire doors are fitted with special high  
temperature ceramic glass panels through which  
the fire can be viewed.  
Before continuing any further with the installation  
of this appliance please read the following guide to  
manual handling.  
Multifuel stoves are fitted with a cast iron grate to  
give full multifuel facility and positive de-ashing.  
• Always obtain assistance when lifting the  
appliance.  
• When lifting always keep your back  
straight. Bend your legs not your back.  
• Avoid twisting at the waist. It is better to  
reposition your feet.  
All models except integral boiler models are lined  
with firebricks or heat reflective panels which  
ensure complete combustion and provide a good  
heat store to even out fluctuations in burning.  
• Avoid upper body/top heavy bending. Do not lean  
forwards or sideways when handling the fire.  
• Always grip with the palms of your hands.  
Do not use fingertips for support.  
• Always keep the stove as close to the body as  
possible. This will minimise the cantilever  
action.  
An internal throat plate produces turbulence to  
encourage secondary combustion and directs the  
flue gas around the whole upper firebox before  
allowing it to escape up the chimney.  
On multifuel appliances the primary air for burning  
enters the ash pit chamber beneath the grate,  
controlled by the air inlet mechanism.  
• Use gloves to provide additional grip.  
Aarrow are also fitted with an "air wash" so called  
because it provides a curtain of high speed preheat-  
ed air behind the glass to help keep it clean and to  
provide secondary air/over draught.  
THE PRINCIPLE OF THE FIRE  
Your Aarrow Fire is built to the highest standard of  
craftsmanship using the best materials and the most  
modern equipment available. It is a highly efficient  
and sophisticated piece of machinery and when  
properly installed and operated it should provide a  
lifetime of heating satisfaction.  
The provision of two inlets on all multifuel stoves  
gives a wide range of primary air/secondary air,  
under draught/over draught combinations.  
The optimum settings will only be established by  
experience in firing the appliance, and will depend  
on type of fuel, the position of the appliance in the  
house, condition of chimney etc.  
Acorn Multifuel Stoves  
5
CHECK LIST  
Inside the appliance you should find the following:  
Part Description & Visual Aid  
(not to scale)  
Acorn 4 Multifuel  
Acorn 5 Multifuel  
Quantity Part No.  
Quanity  
Part No.  
1. Grate bars  
AFS001  
AFS001  
5
5
1
2. Integral  
front brace/  
reatainer  
1
AFS1101  
AFS1086  
AFS009A  
AFS064  
AFS1101  
AFS1018  
AFS009A  
AFS064  
3. Throat  
plate  
1
1
4. Flue  
spigot  
1(4”)  
1(4”)  
1(4”)  
1(4”)  
5. Hot plate  
6. Ash pan  
1
1
1
2
1
1
1
2
AFS1273  
AFS008  
AFS1273  
AFS008  
7.Operating  
tool  
8. Rear  
liners  
AFS1094  
AFS1092  
AFS1059  
AFS1058  
9. Side liners  
10. Fire door  
handle  
AFS205  
AFS205  
1
1
1
1
11. Instructions  
AFS1126  
AFS1126  
The model and Serial Number of your fire can be found stamped into the casing,  
centrally just below the bottom edge of the fire door aperture.  
6
Acorn Multifuel Stoves  
TECHNICAL DATA  
TECHNICAL DATA  
Acorn 4  
Acorn 5  
Multifuel  
Multifuel  
Room Min/Max  
1- 4.5  
1 - 5  
Room Heater Only Output (kW)  
Room Heater with Domestic Hot  
Water with add in boiler type  
Type 7  
Type 0  
Max Output to Room (kW)  
Max Output to Water (kW)  
3
3
2
1.5  
Height (mm)  
458  
483  
Width (mm)  
355  
395  
Depth (mm)  
350  
350  
Height to Centre of Rear Flue  
Depth from Back to Centre of Flue  
Flue Diameter (mm)  
360  
387.5  
96  
90  
102 (4”)  
102 (4”)  
Weight Unpacked  
Packed  
44 Kg  
47 Kg  
43 Kg  
46 Kg  
Acorn Multifuel Stoves  
7
INSTALLATION  
HEARTH  
GENERAL PRECAUTIONS  
Note - All installations must conform to the  
appropriate building regulations.  
The fire should be installed to stand on a  
constructional hearth of non-combustible materials  
not less than 125mm (5'') thick conforming to  
Building Regulations. Dimensions of the hearth  
should project at least 300mm (12'') forward of the  
front of the appliance and 150mm (6'') at the sides.  
The surface of the hearth should be free of  
combustible materials. In most buildings with solid  
concrete floors the requirement will be met by the  
floor itself, but mark the perimeter of the hearth to  
ensure floor coverings are kept well away or use  
different levels to mark the hearth perimeter.  
The Building Regulations for England and Wales  
2000 ref Approved Document J 2002 edition  
(issued by the DTLR).  
The Building Standards (Scotland) (Consolidation)  
Regulations.  
Detailed recommendations for installation of  
appliances, chimneys and flues are outlined in the  
current issue of the following British Standards:-  
BS6461, BS8303 and BS4543.  
COMBUSTIBLE MATERIALS  
Any Manufacturer's Instructions must not be  
taken as overriding statutory requirements.  
A gap of at least 450mm (18'') should be allowed  
between the appliance and any combustible  
materials including furnishings. Adjacent walls  
should be of suitable non-combustible  
construction, preferably brickwork. In large  
fireplaces take care that any supporting beam is  
During installation ensure that adequate  
precautions are taken to avoid unnecessary risk to  
yourself or any householder. In particular the  
danger from the caustic nature of the fire cement  
should be avoided by using these accepted  
methods:  
protected by  
a
13mm (0.5'') sheet of  
Masterboard/Supalux spaced 13mm (0.5'') off the  
surface with strips of non-combustible material  
- not wood.  
•Wear gloves when handling fire cement.  
•Wear goggles when chiselling or looking up  
chimneys.  
Make sure that there is a gap between an  
uninsulated flue system and any combustible  
material. This gap must be at least 3 x the outside  
diameter of the flue pipe, or 1.5 x the flue diameter  
to non combustible surfaces. See the illustration on  
page 14.  
Make sure that Building Regulations are adhered to  
during installation along with any local by-laws.  
In the case of heating systems make sure that the  
pipe work is correctly bonded to ensure electrical  
earthing.  
AIR FOR COMBUSTION  
There must always be a permanent means of  
providing air for combustion into the room in  
which the fire is installed. A permanent vent with a  
HANDLING  
By the time you read this you will appreciate the  
weight of the appliance. The Safety and handling  
guidelines as set out on page 5 of this manual  
should be followed.  
2
total free area of at least 550mm for every kW  
rated output above 5kw should be connected  
directly to the outside air or to an adjacent room  
which itself has a permanent vent of the same size  
direct to the outside air. The fitting of an extractor  
fan to either of these rooms is not recommended.  
To make movement easier internal fittings, grates,  
firebox liners, flue outlets, hot plate, throat plate,  
etc., can be removed.  
Care should be taken to make sure that the hinges  
are not damaged during installation.  
8
Acorn Multifuel Stoves  
INSTALLATION  
REMOVAL OF THE THROAT PLATE  
Blocked chimneys cause dangerous fumes to  
escape. Remove the throat plate at least monthly to  
clean. Keep chimney and flue ways clear.  
FIREBOX LINER PANELS  
The Acorn Multifuel stoves have reflective liners to  
the sides and back. The throat plate sits on top of  
the side and rear panels. These should come fitted  
to your fire, if however they are not proceed as  
follows to fit them.  
FITTING THE OPTIONAL FLOOR  
FIXING KIT  
Once the stove is in the correct position it is  
recommended that the fire is fixed to the floor for  
safety purposes:  
•Remove the front brace retainer.  
•Set the small liner into the back of the fire.  
•Insert side liner panels  
•Fit the throat plate with the single bend and two  
cut outs to the front facing up. The projecting lugs  
sit on top of the side liners. The long centre tab on  
the back edge rests on the rear liners. The shorter  
turn-down tabs against the vertical face.  
•Replace the front brace retainer.  
You will need a No. 2 pozi drive screw driver to  
carry out this operation. Place the brackets each  
side of the appliance.  
Note: Neither the rear firebox liners nor the side  
firebox liners are "handed", both faces are  
suitable for direct contact with the fire.  
Fig. 4 Lining up the bracket  
Slide the small threaded hole underneath the gap  
(as shown above) and turn inside so the both holes  
match the pre-drilled one. Repeat for the other side.  
Fig. 1 Liners inserted in Acorn  
Fig. 2 Inserting throat plate  
Fig. 5 Inserting and tightening the screws.  
When both are in place, tighten the screws until  
they are firmly inserted.  
Then proceed to drill your hearth and insert and  
anchor bolt or similar fixing (Not supplied in kit)  
and bolt down the brackets once the appliance is in  
place. For further instructions please consult the  
floor fixing instructions attached to the kit.  
Fig. 3 Liners, throat plate and  
grate in the Acorn.  
Acorn Multifuel Stoves  
9
INSTALLATION  
MULTIFUEL GRATE  
GRATE  
GRATE BAR REPLACEMENT  
The grates in the Acorn Multifuel units comprise a  
series of reciprocating cast iron bars seated on a  
pivoted "comb". All bars in the grate are identical,  
but every other bar is turned through 180 degrees,  
with the ends of the bars marked "H" sitting on the  
high sections of the comb, and the ends marked "L"  
sitting on the low sections.  
After extended use it may be necessary to  
replace some of the grate bars.  
Periodic inspection of the bars is recommended  
and the removal of any nails or wire that may be  
present after burning wood. All the grate bars in  
each appliance are identical and can easily be  
lifted out after removal of the fuel retainers.  
Remove damaged grate bars and replace with  
casting of the same type, fitting as per  
instructions above. (Check Identification letters  
on the casting when reordering).  
ASSEMBLING THE GRATE  
To assemble the grate, fit bars to low sections of the  
comb first, inserting end marked "H" into rear  
channel with groove on underside of bar located on  
upstand tab, and then lowering end marked "L"  
onto the low section of the comb. The upper bar is  
fitted in a similar manner, but with the end marked  
"L" inserted in the rear channel, and the end  
marked "H" seated on the high section of the comb.  
10  
Acorn Multifuel Stoves  
INSTALLATION  
FITTING THE FLUE OUTLET AND  
HOT PLATE  
FLUES AND CHIMNEYS  
Please remember that chimney draught is  
dependent on four main factors:  
The flue outlet spigot is found inside the appliance.  
It is removed by turning clockwise.  
•Flue gas temperature.  
•Flue height.  
•Flue size.  
Smear a very thin layer of fire cement on the faces  
of the flue outlet and the blanking plate. Fit the  
outlet to the appliance in the desired position.  
•Flue terminal.  
The stove must be connected to a suitable and  
efficient flue that provides a good up draught to  
safely take the products of combustion (fumes)  
from the stove outlet to the outside air. To ensure a  
good updraught it is important that the flue gases  
are kept warm and that the flue size suits the stove.  
Lock into place by rotating anti-clockwise and  
tighten by tapping with a block of wood and mallet  
from the inside of the appliance. Similarly, fit the  
blanking plate to the unused opening. Clean off any  
surplus fire cement.  
Place appliance on the hearth and make sure that it  
is level and does not rock. Connect the chimney  
ensuring all joints are sealed with fire cement.  
The termination of the outlet at the top of the flue  
also needs to comply with the Building  
Regulations. The minimum effective height of the  
flue must be at least 4.5 metres from the top of the  
stove to the top of the flue outlet. When warm the  
flue draught should be between 0.1 and 0.2 mb.  
A chimney may comply with the regulations but  
still be subject to down draught and similar  
problems. A chimney terminating above the ridge  
level is generally less likely to suffer such  
problems.  
If a new chimney is being provided it should fully  
comply with the relevant Building Regulations that  
specify the requirements for solid fuel burning  
installations. Suitable types of chimney include the  
following.  
Fig. 6 Flue and Spigot Fitting  
Masonry chimney built with clay or concrete  
liners, or a chimney block system meeting Building  
Regulations. These types of chimney should be  
installed in accordance with the Building  
Regulations and BS 6461: Part 1.See page 12 for a  
typical installation diagram.  
Factory made insulated chimney complying  
with BS 4543: Part 2 (often called "Class 1  
prefabricated metal chimney"). These types of  
chimney should be installed in accordance with the  
Building Regulations and BS 7566: Parts 1 to 4.  
See page 12 for a typical installation diagram.  
Acorn Multifuel Stoves  
11  
INSTALLATION  
Due to the gradual introduction of European  
Chimney Standards chimneys will be specified  
according to their performance designation as  
defined in BS EN 1443 that covers the General  
Requirements for chimneys. The minimum  
performance designation required for use with solid  
fuel burning stoves is T450 N2 S D3.  
Precautions" section page 8 of these instructions.  
Chimneys should be as straight as possible.  
Horizontal runs should be avoided except where  
the rear outlet of the appliance is used, in which  
case the horizontal section should not exceed  
150mm (6'') in length.  
The flue and chimney installation must be carefully  
checked by a competent person before fitting the  
stove to ensure it is suitable and will work safely.  
If the fire appears to be working hard but produces  
very little output to the room it is likely that  
excessive draw is present in the chimney, and that  
heat is being sucked out of the appliance and up the  
chimney. If this is the case we recommend the  
fitting of a draught stabiliser in preference to a flue  
damper, in the interest of safety and efficiency.  
If the chimney is old (ie built of brick or stone  
without a liner) or being opened up for reuse  
additional checks and smoke testing as described in  
Appendix E of the Approved Document J 2002  
Edition should also be carried out to ensure the flue  
and chimney are in good operating condition.  
We do not recommend the use of a damper when  
burning solid fuel.  
Unless the existing flue is in good condition with  
suitable access for collection and removal of debris.  
If the flue size is more than 225mm (9 inches)  
diameter or 200 x 200mm square, a suitable lining of  
150mm (6 inches) diameter should be fitted, or if the  
flue length is over 5.5 metres one size larger than the  
appliance outlet should be fitted. This should be a  
double skin stainless steel flexible flue liner that is  
independently certified for use with solid fuel.  
Details of suitable linings for use with solid fuel are  
given in the Official HETAS guide that can be  
FOR ALL APPLIANCES  
Access for cleaning the flue should be incorporated  
in the system other than through the appliance (e.g.  
a soot door or access through register plate).  
Purpose-made soot doors and inspection lengths  
are available from manufacturers of all systems.  
Ensure that the whole length of the flue can be  
reached from the soot door.  
Note: if the appliance is fitted with a draught  
stabiliser or if one is fitted to the flue pipe or  
chimney in the same room as the appliance, then  
the permanent air entry opening (or openings)  
should be increased by 300mm2 for each kW of  
rated output.  
It is also important that suitable flue pipe  
complying with the Building Regulations is used to  
connect the stove to the flue in the chimney and that  
suitable access is provided into the flue for regular  
inspection and sweeping of the flueways.  
For advice on flues and chimneys contact;  
NACE (National Association of Chimney  
Engineer): telephone 0800 0924019  
The installer should comply with the Building  
Regulation requirements in respect of providing a  
Notice Plate giving details on the chimney, flue  
lining, hearth and fireplace installation. Approved  
Document J of the Building Regulations for  
England and Wales is available from The  
Stationery Bookshops and can also be viewed at  
the ODPM website at:  
or  
NACS (National Association of Chimney  
Sweeps): telephone 01785 811732  
Details on the relevant Building Regulations and  
BS British Standards are given in the "General  
12  
Acorn Multifuel Stoves  
INSTALLATION  
TYPICAL REAR FLUE OUTLET  
Acorn Multifuel Stoves  
13  
INSTALLATION  
TYPICAL METAL INSULATED CHIMNEY SYSTEM  
TO BE INSTALLED TO THE CHIMNEY MANUFACTURERS INSTRUCTIONS IN COMPLIANCE  
WITH BUILDING REGULATIONS AND BS7566 PTS 1-4  
PLAN VIEW OF REGISTER PLATE AND  
CLEARANCES FOR NON INSULATED FLUES  
A is minimum clearance for non-insulated flue =  
1.5 x D to a non-combustible surface/material  
or  
3 x D to combustible surface/material  
14  
Acorn Multifuel Stoves  
INSTALLATION INSTRUCTIONS  
not be done when in an area with soft water. If  
radiators are used then an indirect system must be  
utilised.  
To connect the cylinder use 28mm copper pipes.  
Ensure that the pipes rise continuously to the  
cylinder.  
ADD IN BOILERS  
Acorn 4 & 5 multifuel stoves offer the option of a  
slab boiler, which occupies the position of the rear  
firebox liner panels.  
Fitting:  
Ensure that the runs are not too long, i.e. 20ft  
maximum each for flow and return. Install the  
cylinder above the level of the fire, and as close to  
it as possible. (the higher the cylinder the faster the  
circulation). Ensure that no valves are present in the  
circulating pipes.  
•Remove the fuel retainers, rear firebox liner  
panels and throat plate.  
•Knock out the blanking discs in the back  
plate corresponding to the terminals on the  
boiler.  
•Introduce the boiler to the appliance  
through the main fire door and locate the  
terminal pipes through the back plate holes  
and seal around boiler terminals with fire  
cement.  
•Engage locking nuts to the thread of the  
terminals and tighten to secure the boiler in  
position, ready for connection to flow and  
return pipes.  
•Replace throat plate (slab boilers only) and fuel  
retainers.  
Do not fit a throat plate with a cantilever boiler.  
Note: On boilers the terminal which is  
approximately flush with the edge of the boiler  
must be fitted uppermost, to prevent "Kettling".  
Indirect Systems- The Domestic Hot Water  
Circuit  
In addition to providing hot water the primary  
circuit is essential in providing a "heat leak" to  
absorb excessive heat produced in the event of the  
circulation pump shutting down.  
Heat is produced in varying quantities while the  
fire is alight and care must be taken to ensure that  
effective circulation can occur around the primary  
circuit to carry heat away and thus stop boiling. The  
output of any radiator installed as a "heat leak"  
should not be less than 10% of the rated output of  
the appliance. The radiator should not be fitted  
with a control valve.  
The cylinder must be of the indirect type with a  
minimum capacity of 110 litres, conforming to  
BS 1566 part 1.  
WATER CONNECTIONS  
Heating systems  
The size of the heating system which can be run,  
will depend on the output rating of the appliance.  
It will be necessary to work out heat loss  
calculations for the system proposed in order to  
establish the kW/hr rating. An appliance that will  
meet this figure can then be chosen; (for boiler  
outputs please refer to the brochure).  
The constructional requirements of installing and  
connecting the appliance also need to be taken into  
account when selecting. Design and calculations  
for individual heating systems should be carried out  
by a qualified heating engineer. In many cases your  
supplier will be able to offer advice and assistance.  
Primary flow and return pipes should be 28mm  
diameter. The cylinder should be installed at a  
higher level than the appliance, and as close to it as  
possible (the higher the cylinder the faster the  
circulation). The flow and return pipes should not  
be longer than 20ft each. Pipe runs should rise  
continually from the boiler to the cylinder.  
A radiator of approximately 25 sq.ft. should be  
connected into the primary circuit, if installed in the  
bathroom it provides a means of drying towels in  
the summer.  
Safety Vent Circuit  
This circuit consists of a cold feed pipe, expansion  
pipe, and expansion tank. The possibility that water  
may boil can never be completely ruled out, and it  
is therefore vital to ensure that cold water can be  
supplied to the boiler and steam vented from it at all  
times.  
Direct Systems  
Stainless steel boilers, either factory fitted or  
retro-fitted as add-in boilers enable connection to  
direct systems to be made without the need to  
change the cylinder or to fit an expansion tank. This  
applies to domestic water supply only and should  
Acorn Multifuel Stoves  
15  
INSTALLATION INSTRUCTIONS  
The expansion tank should have a capacity of at  
least 7 % of the system's water capacity. The cold  
water feed pipe should be at least 22mm diameter.  
The following details must be checked and  
completed in full by the installer at the time of  
installation. Please answer all questions as fully as  
possible. Arada Ltd can not be held responsible  
for chimney or installation.  
There must not be any shut off valves in the circuit.  
Pipes should be run to avoid air locks. A spring  
safety valve should be fitted to the expansion pipe  
close to the boiler.  
HOT WATER SYSTEMS  
It is often possible, and is good practice, to utilise  
the primary flow and return as part of the safety  
circuit. The ball valve should have a copper ball.  
The overflow pipe from the expansion tank should  
be 28mm diameter copper. Pipes in unheated  
spaces must be lagged.  
Is the boiler cross-flowed?  
YES / NO  
YES / NO  
Are the pipes correctly sized?  
What is the calculated output  
required to heat the system?  
Is a heat leak fitted?  
YES / NO  
YES / NO  
What is the return water temperature?  
FINAL CHECK  
Is the pump thermostatically  
controlled by a pipe stat?  
Before handing over the installation to the  
customer it is strongly recommended that the  
appliance is lit and the functioning of the chimney,  
hot water and heating system is checked.  
What is the height and distance of the  
hot water tank above the stove?  
AIR INLET CONTROLS  
A checklist (Pre-lighting Checks) appears in the  
Operating Instructions, but in addition to this the  
installer should:  
The Acorn multifuel stoves have two air inlets:  
•The air wash system (so called because its  
pre-heated high speed air washes across the inner  
face of the door glass, keeping it clear), which  
provides over draught, and  
•The oval cover; the primary air inlet  
providing under draught to the base of the fire  
chamber through control on the bottom of the  
stove door.  
Operate the heating system and set the  
pump head.  
Balance the radiators.  
Re-vent and ensure no air locks.  
Check the circulation round the primary  
system and the heat leak radiator,  
particularly when the pump is running, to  
ensure circulation is not reversed.  
Be sure that the chimney is operating and  
that ALL smoke and fumes are vented to  
the atmosphere through the chimney  
terminal.  
PRIMARY AIR FOR MULTIFUEL  
Air enters the appliance through the control on the  
bottom of the fire door. The Aarrow Acorn has a  
single control knob which slides left to right.  
Sliding the knob to the right will increase the  
amount of air intake to the stove. To decrease push  
knob to the left.  
Check all joints and seals.  
Clean the outside of the appliance to  
prevent any stains becoming burnt on.  
Check the flue draught which should read  
1 - 2mm, or 0.1 - 0.2mbar.  
AIRWASH SYSTEM  
The air wash has an internal sliding plate with slots,  
housed in a cover plate, and is located above the fire  
door. Sliding the control knob to the right as far as it  
will go achieves the fully open position. Sliding it to  
the left will shut off the air inlet slots see page 17.  
16  
Acorn Multifuel Stoves  
OPERATING INSTRUCTIONS  
multifuel grate position and for emptying the ash  
pan. (Fig. 10)  
Fig. 7 Fully Closed Fig. 8 Fully Open  
Even when all the slots are completely shut a  
"bleed" of secondary air will be maintained  
ensuring that inflammable gases are burnt off.  
Fig. 10  
DISASSEMBLE AIRWASH  
The Aarrow air wash may be disassembled for  
cleaning or adjustment. To achieve this, the  
following procedure should be followed:  
RIDDLING  
Use the operating tool for setting the grate in the  
coal burning position or the wood burning position.  
This means that effective de-ashing (see page 19)  
takes place, and also allows the grate to be set in the  
coal burning or wood burning position, as  
indicated on the right hand side of the appliance.  
•The door should be GENTLY lifted off its hinges  
so that the below operations can be carried out on a  
workbench or similar level surface.  
This should be done when the appliance is cold.  
FIRE DOOR GLASS  
In the event of the door glass being broken it can  
easily be replaced:  
•The door should be GENTLY lifted off its hinges  
so that the below operations can be carried out on a  
workbench or similar level surface. This should be  
done when the appliance is cold.  
•Unscrew the four nuts, on the inside of the door.  
•Remove the upper airwash cover and the two  
lower glass clips.  
•Carefully remove any pieces of broken glass, and  
sealing gasket wearing suitable gloves.  
Fig. 9 Rear of the fire door  
•Remove the glass by unscrewing the top and  
bottom nuts.  
•Carefully remove the glass and lift airwash cover  
off.  
REFIT NEW GASKET  
•The fitting of new gasket is shown below (Fig.11a)  
•Unscrew the airwash spring knob from the sliding  
plate.  
•Remove assembly from the appliance.  
•Clean and/or adjust.  
•Refit using reverse procedure.  
MULTI - PURPOSE OPERATING  
TOOL  
Fig. 11a fitting new door gasket  
•Re-seat the new glass, ensuring the sealing gasket  
is flat and in contact with the glass (Fig.11b)  
Your Aarrow stove comes with a multi-purpose  
tool, which is used for, riddling, setting the  
Acorn Multifuel Stoves  
17  
OPERATING INSTRUCTIONS  
•Refit the door and check to ensure it now  
sits square to the body; if not repeat above steps.  
FUEL TYPES  
Wood- Any type of wood is suitable provided it is  
well seasoned and has a moisture content below  
20%. This usually implies that the timber has been  
suitably stored to allow moisture to evaporate for at  
least nine months in the case of soft woods, and at  
least eighteen months in the case of hard wood. We  
recommend that for general burning, wood should  
be split into logs of no more than 130mm (5")  
diameter. Larger logs can be used for overnight  
burning.  
Fig. 11b fitting new glass  
•Replace the two lower retaining clips and nuts.  
•Replace the upper airwash cover and nuts. Do not  
over-tighten the nuts as damage may occur to the  
glass (Fig.11c)  
WARNING wet wood must not be used as this will  
greatly contribute to the creation of tar and creosote  
which may, in extreme cases, run down the  
chimney in liquid form. This will seriously damage  
both the chimney and the appliance, and increase  
the risk of chimney fire.  
Fig. 11c tightening nuts  
Note: If you have sticky tar inside the appliance or  
chimney your wood is 'Green' or too wet.  
ADJUSTING THE DOOR HINGES  
Once the appliance has been under fire for a period  
of time the fire door may appear to have moved out  
of alignment with relation to the door aperture or  
catch. This is quite normal and due to the settling of  
the casing.  
Recommended Reading:  
"Wood as Fuel" available from the Forestry  
Commission.  
Peat- Can be used in turf or briquette form, but  
again the moisture content must be low.  
The fire door can be re-aligned by the user as  
follows:  
•When the appliance is cold, open the fire door so  
that it is at right angles to the front of the fire.  
•Lift the fire door up off its hinges.  
Paper- paper will burn successfully. Burn dry  
paper only or chimney damage will occur.  
NEVER BURN PLASTICS OR WASTE IN  
YOUR STOVE.  
•Gently tap the hinge pins in a direction to  
compensate for the misalignment (Fig. 12)  
Coal for Multifuel only - Household coal  
produces a large amount of ash and smoke and  
chimney will require frequent cleaning. Therefore  
soft house coal is not recommended.  
Recommended fuels are as follows:  
The Hetas Ltd, "Three tick" appliance approval  
only covers the use of the following fuels in this  
appliance;Phurnacite, Phurnacite Plus, Centurion,  
Maxibrite,Extracite,Pureheat, Blazebrite, Taybrite,  
Sunbrite (double/singles), Anthracite (large nuts),  
and Welsh Dry Steam Coal (large/small nuts).  
Fig. 12 tapping door hinges  
18  
Acorn Multifuel Stoves  
OPERATING INSTRUCTIONS  
Approval does not cover the use of other fuels  
either alone or mixed with a suitable fuel listed  
above, nor does it cover instructions for use of  
other fuels. For latest details please refer to Hetas  
position and the fire doors are closed.  
•Set the air wash to one quarter open position.  
•Set the primary inlet to the fully open position  
•Light in the normal manner with paper and  
kindling, or use a fire lighter.  
•If using a gas poker be sure to remove it  
immediately the fire is alight.  
•When the fire is well alight regulate the burning  
rate by adjusting the setting on the primary air  
inlet control.  
Do not use Homefire (six sided) and smaller sizes  
than Stovesse, e.g. Beans,Peas,Grains.  
Do not use petroleum based solid products such  
as Calco or Petrocoke.  
To do so will INVALIDATE the appliance  
guarantee.  
•The air wash can be opened sufficiently to keep  
the door glass clean.  
BURNING WOOD  
LIGHTING THE FIRE  
Prior to lighting the fire for the first time check  
with the installer that:  
•Set air wash to the fully open position  
•Proceed as for solid fuel but note the fire will burn  
up and become established more quickly.  
•Installation and all building work is complete.  
•The chimney is sound and has been swept and is  
free from obstruction.  
•Adequate provision for combustion air has  
been made, i.e. a permanent vent of at least  
550mm² per kW of rated output above 5 kW,  
is fitted in the room in which the appliance  
is installed.  
MIXED FUELS  
•As per coal but allow additional secondary air.  
•The primary air inlet can be closed and burning  
regulated by means of the air wash above the door.  
ANTHRACITE  
Anthracite is more difficult to keep in for long  
periods, consequently more care in setting the  
controls and some familiarisation is necessary  
when burning anthracite.  
•That Building Regulations and any local  
by-laws have been followed during installation  
(see installation instructions).  
Use the smallest size fuel (Stovesse or Small Nuts).  
Proceed as for manufactured smokeless fuel. Leave  
the air inlet control open about a quarter or less.  
Note: The high temperature paint acquires  
durability by being "cured" during the initial  
firings of the appliance will give off fumes which  
are non-toxic, but which certain persons may find  
have an unpleasant or irritant effect. Ensure that  
•All firebox liner panels are in place.  
•Throat plate is in place.  
•That the chimney draw has been checked and is  
within specification. With the chimney warm the  
draught should be between 1 - 2mm water gauge  
(0.1 - 0.2mbar).  
WARNING: An over drawing chimney can cause  
over-firing resulting in damage to the appliance.  
the area is well ventilated during this time.  
ENSURE THAT YOU HAVE READ  
UNDERSTOOD THESE INSTRUCTIONS  
BEFORE LIGHTING THE FIRE.  
&
EXTENDED BURNING  
The appliance will burn for an extended period  
provided:  
•Sufficient fuel is placed in the firebox.  
•The controls are set correctly.  
•Excess draught is not present in the chimney.  
•Fire door is closed.  
ALWAYS WEAR SUITABLE PROTECTIVE  
FIRE GLOVES WHEN REFUELLING YOUR  
STOVE.  
•If the fire goes out with unburnt fuel left in  
the firebox increase the air opening slightly,  
and vice versa.  
SOLID FUEL BURNING - Multifuel Stoves  
•Ensure that the multifuel grate and ash pan are in  
Acorn Multifuel Stoves  
19  
OPERATING INSTRUCTIONS  
In the morning  
DE - ASHING  
•Open the air control fully until embers begin  
to glow brightly and place pieces of fuel on  
the fire until it is well established.  
It is necessary to maintain an ash layer on the upper  
surface of the grate bars, in order to protect them so  
de-ashing should cease as soon as the first red  
embers drop into the ash pan. Further de-ashing  
will cause heat build-up under the grate, which will  
considerably shorten its life. This operation should  
be carried out with the doors closed to prevent dust  
escaping into the room.  
WARNING: When wood is burnt slowly in a  
closed appliance it produces moisture and tar,  
which will create condensation and deposits in the  
chimney. This effect can be minimised by burning  
hard for a short period, about 20 minutes, twice a  
day. It is usually convenient to do this morning and  
night.  
•Move up and down vigorously the riddling  
lever (ash will fall into the ash pan beneath  
the grate).  
Note: To avoid chimney problems your fire should  
not be burnt slowly for longer than 12 hours  
without a period of fast burning.  
•When de-ashing is complete re-set grate to  
previous position.  
• Empty ash pan.  
WARNING: Properly installed, with a suitable  
flue and chimney and operated and maintained  
this appliance will not emit fumes into the  
dwelling. Occasional fumes from the de-ashing  
and re-fuelling may occur. However, persistent  
fume emission is potentially dangerous and must  
be investigated by a Hetas registered installer.  
Stop using the appliance if you smell fumes or  
see smoke escaping.  
Note: Do not force the riddling mechanism.  
TO EMPTY THE ASH PAN Open the fire  
doors. Fit the fork end of the operating tool into the  
ash pan and remove from the ash pit chamber.  
WARNING: The ash can be very hot. Empty only  
to a metal container. Even if the ash appears cold,  
red-hot pieces of ash may be concealed and could  
easily start a fire or cause an injury.  
If fume emission does persist, the following  
immediate actions should be taken.  
•Open doors and windows to ventilate room.  
•Let the fire die or extinguish and safely  
dispose of fuel from the appliance.  
•Check for flue or chimney blockage, and  
clean if required.  
Seek expert advice from your HETAS registered  
installer. Do not attempt to re-light the fire until the  
cause of the fume emission has been identified and  
corrected  
CLINKER  
The formation of clinker suggests that the unit is  
being over-fired. Any clinker forming on the grate  
should be removed when cold.  
OVER-FIRING  
Do not over fire your appliance. Using flammable  
liquids or too much wood or firing the stove at  
maximum, for prolonged periods may result in  
over-firing. If the chimney connector or casing glows  
red the appliance is being over-fired. If this occurs  
immediately close all air inlets to the appliance to  
reduce the air supply to the fire. Should a chimney  
fire occur immediately close the appliance down.  
Get everyone out of the house and call the fire  
brigade. A chimney fire may cause structural  
damage to the chimney. Do not use the appliance  
until the chimney and connector have been  
inspected and any damaged parts have been repaired  
or replaced. This should be done by a competent  
person such as a HETAS registered engineer.  
ASH REMOVAL  
The appliance will require ash to be removed  
periodically but an ash bed of approximately 20mm  
(3/4'') should be maintained. Ash may be removed  
with a small shovel whilst the fire is still lit by  
raking the embers of a low fire to one side of the  
fire box and carefully removing the ash, then  
repeating the procedure for the other side. Care  
must be taken not to risk burning of hands or  
household objects from falling embers.  
20  
Acorn Multifuel Stoves  
OPERATING INSTRUCTIONS  
CLEANING  
DOOR GLASS  
Important; Under some circumstances soot can quickly  
build up on the throat plate and adjacent areas. The  
throat plate should be removed and checked monthly,  
and any debris stripped off. Similarly, clean the upper  
The door glass should remain clear during normal  
daytime burning. However under certain conditions-such  
as burning at a low rate with damp wood, or overnight  
burning, the glass may become somewhat blackened. To  
remedy this, operate the appliance at a fast rate.  
surface of the firebox.  
Alternatively when the stove is cold open the door and  
clean the inside face of the glass with a damp cloth or  
with glass cleaner (available from fire stockists). Apiece  
of cloth moistened with vinegar and dipped in wood ash  
- not coal ash - will provide a good soft scourer to  
remove the soot without scratching the glass.  
ANNUAL MAINTENANCE  
It is important that your fire is regularly serviced in  
accordance with these instructions. This should be  
carried out at least annually by a qualified person and  
should consist of the following.  
OUTER FINISH  
Remove the firebricks lining and throat plate, inspect all  
gasketing on doors, glass etc., and re-order any items  
that may need replacing, from your Aarrow dealer.  
With a wire brush clean inside the appliance paying  
attention to the small inlet holes on the fire door.  
The outside finish of the appliance is a durable high  
temperature paint. It is best cleaned by brushing down  
with a clean shoe brush. Do not allow moisture to remain  
on the appliance whilst cold or surface rust may form.  
The high temperature paint should not require attention  
for some time, depending on use. The hotter the fire  
burns the sooner repainting will be necessary. Aerosol  
tins of paint are available for complete refurbishing.  
Before repainting make sure that the fire is out and is  
cold.  
Sweep the chimney and confirm that it is sound.  
Examine all joints in the flue pipe etc., and re-seal if  
necessary. Reassemble and leave with the air inlet and  
air wash control about half way open. This will allow a  
free flow of air through the appliance thus preventing  
moisture and condensation from building up inside the  
fire and chimney.  
•Remove the door glass.  
•Lightly wire brush, or rub with wire wool, the body of  
the appliance to remove any loose paint  
powder.  
•Mask or remove items such as brass work.  
•Any adjacent brickwork, mantelpiece, hearth, etc.,  
should be carefully masked for quite a distance around  
the appliance. (this precaution is to prevent  
discolouration of the surrounding brickwork,  
wallpaper etc).  
CHIMNEY SWEEPING  
Sweeping should be carried out with an appropriate  
sized bristle brush and rods to suit chimney size and  
type.As with all appliances regular sweeping of the flue  
is essential to avoid the danger of blockage and the  
escape of poisonous fumes. Access for cleaning should  
also be incorporated in the chimney (e.g. soot door or  
access through register plate).  
Any existing chimney should be swept prior to  
installation of the appliance, and swept again a second  
time within one month of regular use after installation  
to establish frequency of sweeping required.  
Re-spray in a well-ventilated area - avoid breathing  
the vapour. Refer to safety instructions on paint  
cans.  
•When the paint is dry refit door glass and any other  
parts previously removed.  
•Leave the appliance for eight hours before-lighting.  
•Burn slowly for the first four hours, then build up heat  
gradually to cure the paint.  
This should be done by a competent person such as a  
NACS chimney engineer who will provide a Certificate  
of Chimney Sweeping.  
Note: Use only genuine Aarrow touch-up spray as  
some paints interact. This could ruin the finish and  
invalidate the guarantee.  
Note: Cracking of lining panels does not effect  
efficiency.  
The whole flue way including the outlet must be swept  
at least twice per burning season. It is important that the  
flue ways, flue pipe and chimney be cleaned prior to  
lighting the fire after a prolonged shut-down period.  
Acorn Multifuel Stoves  
21  
FINAL CHECK LIST  
CHECKLIST  
Hearths, Fireplaces, Flues and chimneys  
This checklist is to ensure hearths, fireplaces, flues and chimneys are satisfactory, and to show what you have done to comply with the  
requirements of The Building Regulations 2000 Approved Document J 2002.  
1. Building address, where work has been carried out.......................................................................................................................................  
.........................................................................................................................................................................................................................  
2. Identification of hearth, fireplace chimney or flue  
3. Firing capability: solid fuel/gas/.  
4. Intended type of appliance.  
State model and output.  
5. Ventilation provisions for the appliance:  
State type and area of permanently open vents.  
6. Chimney or flue construction  
a) State the type or make and whether new or existing.  
b) internal flue size (and equivalent height, where  
calculated - natural draught gas appliances only).  
c) If clay or concrete flue liners used confirm that they are  
correctly jointed with socket end uppermost and  
state jointing materials used.  
d) If an existing chimney has been refurbished with a  
new liner, type or make of liner fitted.  
e) Details of flue outlet terminal and diagram reference.  
Outlet Details:  
Complies with:  
f) Number and angle of bends.  
g) Provision for cleaning and recommended frequency.  
7. Hearth. Form of construction. New or existing?  
8. Inspection and testing after completion  
Tests carried out by:  
Tests and results  
Flue  
visual  
inspection  
sweeping  
coring ball  
smoke  
Appliance (where included) spillage  
I/we the undersigned confirm that the above details are correct. In my opinion, these works comply with the relevant requirements in  
Part J of Schedule 1 to the Building regulations.  
Print name and title....................................................................................................Profession..........................................................................  
Capacity......................................................................................................................Telephone..........................................................................  
Address............................................................................................................................................................Post code.......................................  
Signed........................................................................................................Date.................................  
Registered membership of..(e.g. CORGI, OFTEC, HETAS, NACE, NACS)............................................  
22  
Acorn Multifuel Stoves  
PARTS LIST  
Visual Aid  
(not to scale)  
Acorn 4  
Part No.  
Acorn 5  
Part No.  
Part Description  
1. Integral Front  
Brace/ Retainer  
AFS1101  
AFS1086  
AFS001  
AFS064  
AFS008  
AFS1273  
AFS009A  
AFS1101  
AFS1018  
AFS001  
AFS064  
AFS008  
AFS1273  
AFS009A  
2. Throat Plate  
3. Grate Bar  
4. Hot Plate  
5. Operating Tool  
6. Ashpan  
7. Flue Spigot  
Acorn Multifuel Stoves  
23  
PARTS LIST  
Visual Aid  
(not to scale)  
Acorn 4  
Part No.  
Acorn 5  
Part No.  
Part Description  
8. Liner Set  
AFS1090  
AFS1092  
AFS1094  
AFS1095  
AFS1010  
AFS047  
AFS1015  
AFS1058  
AFS1059  
AFS1095  
AFS1010  
AFS047  
9. Side Liner  
10. Back Liner Set  
11. Glass  
Replacement Kit  
Complete with  
Gasket  
12. Glass Clips  
13. Hinge kit  
Comprises 2 Hinges  
& 4 Fixings Per Set.  
14. Airwash  
AFS1097  
AFS1097  
24  
Acorn Multifuel Stoves  
PARTS LIST  
Visual Aid  
(not to scale)  
Acorn 4  
Part No.  
Acorn 5  
Part No.  
Part Description  
15. Fire Door Rope  
Kit Complete with  
Door Rope Glue.  
AFS048  
AFS1099  
AFS1100  
AFS204  
AFS048  
AFS1099  
AFS1149  
AFS204  
16. Main Door  
Assembly Complete  
with Handle,Glass,  
Gaskets,Clips and  
Seal.  
17. Comb with  
Extension  
18. Fire Door  
Locking Assembly  
Including Fire Door  
Handle  
19. Rear Grate Bar  
Support  
AFS1117  
AFS1117  
20. Aarrow Fires  
Gauntlet Gloves  
AFS997  
AFS997  
21. Optional Floor  
Fixing Kit.  
AFS1135  
AFS1135  
Acorn Multifuel Stoves  
25  
GUARANTEE  
All Guarantee periods commence on the date of  
purchase and are non-transferable.  
Guarantee  
Our Guarantee is offered as an addition to your  
statutory rights.  
Once again we would like to thank you for buying  
an Aarrow fire.  
If you think your fire is not working correctly or in  
the case of a breakdown, please call your local  
When you buy an Aarrow Fire, you are not only  
buying a first class appliance - you are buying a  
commitment from us to look after you and your  
appliance for as long as you want.  
Aarrow retailer, who will have the  
knowledge  
and experience to assist you.  
When you contact them they will need to know :  
Your Aarrow Fire carries a guarantee against  
defects of manufacture and faulty workmanship for  
a period of three years from the date of purchase.  
This does not apply to items which would be  
subject to fair wear or tear. Firebox liner panels,  
fuel retainers, throat plate, door rope, door glass  
and gaskets are not covered by the guarantee.  
However, should you have any problems with your  
appliance please contact your Aarrow stockist who  
will have the knowledge and facilities to help you.  
1. Your name, address, post code and telephone  
number.  
2. Stove serial number  
3. Clear and concise details of the fault.  
CUSTOMER REGISTRATION  
See card enclosed  
Arada Ltd will not be responsible for any conse-  
quential or incidental loss, damage, or injury how-  
ever caused.  
To guarantee the very best in after-sales service,  
do not forget to complete and return your  
Customer Registration Card within 14 days (a  
stamp is required).  
Claims are not valid where the installation does  
not conform to local Building Regulations and  
fire codes.  
Just complete the form and return it to us to benefit  
from our three year Guarantee.  
The Guarantee is conditional upon the appliance  
being serviced and checked annually by a qualified  
heating engineer.  
Please contact us direct 01308 427234 if no  
Customer Registration Card is included.  
The Manufacturers decision shall be final.  
If your appliance proves to be defective as a  
result of faulty materials or workmanship  
during guarantee, we will repair or replace it  
FREE OF CHARGE as long as the fire has been  
installed according to the manuals instructions.  
USE OF SPARE PARTS OTHER THAN  
THOSE SUPPLIED BY Arada LTD WILL  
INVALIDATE THE  
WARRANTY.  
APPLIANCE  
26  
Acorn Multifuel Stoves  
SERVICE RECORD  
Company  
Work Carried Out  
Signature  
Date of Visit  
Should you have any questions about your Acorn Multifuel Stove that is not covered in this manual please  
contact your Aarrow retailer.  
Please keep all repair receipts safely.  
Please ensure you have this manual available when an engineer visits as they will complete the service record  
chart.  
Acorn Multifuel Stoves  
27  
FINAL FACTORY CHECK LIST  
Model..................................  
Serial No.............................  
QUALITY  
FINISH  
I’ve checked it  
and it’s O.K.  
PARTS  
FLUE OUTLET  
HOT PLATE  
FRONT INTEGRAL BRACE  
GRATE  
Assembled by.............................  
Checked by ................................  
FIREBOX LININGS  
THROAT PLATE  
AIR WASH  
DOOR CATCHES  
ASH PAN  
OPERATING TOOL  
OPERATING INSTRUCTIONS  
Please ensure the enclosed registration card is completed and returned to Arada Ltd and the following infor-  
mation completed for your own information.  
Date of Purchase....................................  
Name and address of supplier.......................................................................  
.......................................................................................................................  
.......................................................................................................................  
* Please ensure installer completes INSTALLATION CHECK LIST details  
on page 22 of this manual.  
BK022  

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