ACR STOVES Tenbury User manual

Tenbury
Multifuel Stove • Model T550MF
To be retained by the user for future reference
Thank you for purchasing an ACR Heat Products stove
TECHNICAL MANUAL
T550MF 0101 • Version1 date 20/11/17
Serial Number:
MULTI
FUEL
SMOKE
EXEMPT
AIRWASH
SYSTEM
10
YEAR
10
YEAR
WARRANTY

Important!
• The installation of this appliance must
comply with current Building
Regulations and local regulations,
including those referring to national
and European standards.
• Do not operate this appliance if it
becomes damaged.
• Improper use, maintenance or fitting
parts other than those approved by
the manufacturer could lead to the
appliance becoming damaged or
unsafe which in turn could lead to
personal injury or damage to the
property and will void the warranty.
• The appliance must not be modified in
anyway unless authorised by ACR
Heat Products Ltd.
• The appliance should be inspected
regularly to ensure the airways are
clean and free from obstruction and
the chimney swept at least once a
year.
• The external surfaces of this
appliance will be very hot to the touch
when in operation and due care will
need to be taken when operating the
appliance to ensure safety. A fire
guard should be fitted if it is likely that
the elderly, infirm or children may
come into contact with the appliance.
• This appliance must not be used as
an incinerator.
• This appliance has been designed for
intermittent operation.
To ensure that you gain the most from your purchase, please
take a few minutes to read through this manual before lighting
the appliance for the first time.
Since April 2002 only registered competent installers can install solid fuel
appliances. Installations carried out by non-registered installers must be
inspected by local authority building control.
For more information please contact hetas at: www.hetas.co.uk or
telephone: [phone]
Before installation, please ensure that the correct model has been supplied.
Please make a note of the serial number of your appliance in the space
provided on the front cover of this manual as this will be requested if you
require technical assistance in the future.
Please also ensure that the commissioning checklist at the rear of the manual
is completed in full.

T550 Specifications
*** Please note that Building Regulations Document J advises that additional permanent air supply is
required for appliances with an output of above 5Kw.
With modern properties additional air may be required as Document J suggests that additional air
would be a benefit.
• If design air permeability ≥5.0m³/ (h.m²) then 550mm²/kW of appliance rated output above 5kW
Or
• If design air permeability ≤5.0m³/ (h.m²) then 550mm²/kW of appliance rated output
• If in doubt, please consult your registered installer for advice.
Nominal heat output 5 kW - Wood 5 kW - Smokeless Fuel
Chimney draft required 12Pa
Height 550 mm (Internal Box) 585 mm (External Trim)
Width 550 mm (Internal Box) 620 mm (External Trim)
Depth 334 mm (Recessed) 344 mm (External Trim)
Weight 75 kg
Air Requirement N/A ***
Flue Mass Gas Flow 3.6g/s - Wood 3.5g/s - Smokeless Fuel
CO @ 13% O20.08 Wood Vol% 0.07 Smokeless Fuel Vol%
Mean Flue Gas Temperature 263°C - Wood 293°C - Smokeless Fuel
Efficiency 82.9% - Wood 79.8% - Smokeless Fuel
Log Length Up To 400 mm
Hearth Temperature 152ºC
Mean CnHm @13% O2Wood - 55Nmg/M3Maxibrite - 11Nmg/M3
Mean NOx @13% O2Wood -88Nmg/M3Maxibrite - 66Nmg/M3
DIN Plus Dust @13%O2Wood -26Nmg/M3Maxibrite -11Nmg/M3
DO NOT INSTALL IN A ROOM CONTAINING AN EXTRACTOR FAN UNLESS
THE APPLIANCE HAS BEEN CORRECTLY TESTED IN ACCORDANCE
WITH BUILDING REGS DOC J
334
344
550 585
550
620

The Clean Air Act 1993 and Smoke Control Areas
SMOKE
EXEMPT
Under the Clean Air Act local authorities
may declare the whole or part of the
district of the authority to be a smoke
control area. It is an offence to emit
smoke from a chimney of a building,
from a furnace or from any fixed boiler if
located in a designated smoke control
area. It is also an offence to acquire an
"unauthorised fuel" for use within a
smoke control area unless it is used in
an "exempt" appliance ("exempted"
from the controls which generally apply
in the smoke control area).
In England appliances are exempted by
publication on a list by the Secretary of
State in accordance with changes made
to sections 20 and 21 of the Clean Air
Act 1993 by section 15 of the
Deregulation Act 2015. Similarly in
Scotland appliances are exempted by
publication on a list by Scottish
Ministers under section 50 of the
Regulatory Reform (Scotland) Act 2014.
In Northern Ireland appliances are
exempted by publication on a list by the
Department of Agriculture, Environment
and Rural Affairs under Section 16 of
the Environmental Better regulation Act
(Northern Ireland) 2016.
In Wales appliances are exempted by
regulations made by Welsh Ministers.
• The Tenbury (T550) has
been recommended as
suitable for use in smoke
control areas when
burning wood. As such,
when the
secondary/tertiary slider is in the
closed postion it remains open by
6mm and is prevented from closing
by a screw.
Further information on the requirements
of the Clean Air Act can be found here:
www.gov.uk/smoke-control-area-rules
Your local authority is responsible for
implementing the Clean Air Act 1993
including designation and supervision of
smoke control areas and you can
contact them for details of Clean Air Act
requirements.
CO Alarms
It is required by building regulations that
whenever a new or replacement
wood/solid fuel or biomass appliance is
installed in a dwelling a carbon monoxide
alarm to BS EN 50292:2002 must be fitted
in the same room as the appliance.
The alarm should be installed according
to the alarm manufacturers instructions
and should not be considered a substitute
for the appliance being installed
incorrectly or regular maintenance of the
appliance or flue system.

Installation Instructions
Location of the unit
The appliance must stand on a non-
combustible constructional hearth
which is at least 125mm thick with the
minimum dimensions as shown in the
opposite diagram (please see Building
regs. Document J for further
information).
If the appliance is to be fitted in a raised
application, due consideration should
be given to extending the depth of the
superimposed hearth to safely contain
any falling embers or logs.
The hearth and building construction
must be of a suitable material to comply
with current building and local authority
regulations. The fabrication of the
construction must have a suitable load
bearing capacity for the appliance and
hearth.
If in any doubt, please consult a
competent person for advice before
proceeding.
150mm
150mm
225mm
Constructional
Hearth
Superimposed
Hearth
500mm 888mm
125mm
Important information
Before installation and/or use of this
appliance please read these instructions
carefully to ensure that all requirements
are fully understood.
This appliance must be installed by a
registered engineer, or approved by
building control, failure to do so may
endanger life and property.
All the below instructions should work in
conjunction with building regulations
document J, if there is a variation the
most stringent requirement should be
adhered to.
Asbestos
This appliance contains no asbestos, if
there is the possibility of disturbing any
asbestos in the installation of this
appliance then specialist advice must
be sought and appropriate precautions
taken.
Metal Parts
This appliance may contain sharp metal
edges, take care when installing or
servicing this appliance to avoid
personal injury. Please use appropriate
personal protective equipment at all
times.
Each installation is unique to the
property, the information contained in
this manual may not give exact
installation requirements for your
installation.
The installation must comply with
Building Regulations, European
Standards and Local authority bylaws.
Fire Cement
Some types of fire cement are caustic
and should not be allowed to come into
contact with the skin. In case of contact
wash immediately with plenty of water.

Minimum Builders
Opening
For ease of installation the builders
opening may be made slightly larger
than the appliance dimensions, please
see diagram opposite.
The construction of fireplace recess
should be of a suitable non-combustible
material such as brick or concrete
blockwork, and have a minimum
thickness of 200mm to the sides and
rear of the appliance, unless it is a back
to back recess within the same property.
Please refer to building regs document J
for more information.
Clearances to
combustible materials
Installation into a false
chimney breast
All parts of the false studwork chimney
must be constructed of a non-
combustible material i.e. metal
studwork.
Do not use combustible materials within
the chequered area (150mm to the sides
of the appliance and 300mm to the rear
of the appliance).
Do not fill the area surrounding the
appliance with insulating material, the
void around the appliance must be
ventilated to prevent a buildup of excess
heat.
There must be minimum ventilating area
at both high and low levels of 50 cm²
each, the vents should take ambient air
from the room in which the appliance is
installed and return the warm air back
into the same room environment.
Consideration should also be taken to
provide adequate access to the
connecting flue for service and
maintenance purposes.
384mm
560mm
570mm
150mm 150mm
300mm

Installation into a wooden
decorative fireplace
If the appliance is to be fitted in
conjunction with a combustible fire
surround the minimum clearances must
be maintained, please see diagram
opposite (150mm to the sides and
600mm above) these dimensions should
be adhered to from any point of the
appliance to any combustible material.
If granite, stone, marble or any other
non-combustible decorative material is
to be used as a superimposed hearth
and back panel provision should be
made for heat and expansion. The use
of a slabbed and split back panel and
hearth is recommended, if in doubt
please seek the recommendation of a
competent person or manufacturer of
the above mentioned product.
Curtains and soft furnishings should be
a minimum of 1m away from the
appliance.
We do not recommend that plasma
televisions and expensive artwork are
hung over the fireplace.
Flue Requirements
The flue must comply with current
Building Regulations Document J.
The construction of masonry, flue block,
insulated flue systems and flexible flue
liners must comply with the
manufacturers instructions at all times.
The flue must be:
A 150mm flue diameter is
recommended, 125mm may be
used if the appliance still has its
smoke exempt stop in place
In sound condition and provide
sufficient draft (minimum 12pa)
Suitable for use with solid fuel
burning appliances
Be able to clean the entire length of
the flue system without removal of
the appliance
Free from deposits
Well insulated
At least 4.5m in height from hearth
level to termination, with no more
than 4 x 45º bends in any one flue
system and have a maximum
horizontal length of no more than
20% of the overall vertical height
The termination should be sited as
to avoid a negative pressure zone
The flue must not be:
Shared with other appliances
Weight bearing on the appliance
A smaller diameter than the
appliance flue collar size (125mm)
150mm 150mm
600mm

Installation of the unit
The appliance is supplied pre-
assembled with the flue spigot in the
top exit position and the Smoke Exempt
stop in place.
The Smoke Exempt stop must not be
removed unless the appliance is
installed in a non-smoke exempt area
and this action should only be
undertaken by a competent person.
To remove the smoke exempt stop,
remove the M8 smoke exempt bolt from
the front of the secondary air slider.
• This appliance cannot be installed
with a rear flue option.
Remove the trim by pulling it towards
the front of the appliance.
Remove the vermiculite baffle by
lifting and rotating through the
combustion chamber.
Remove the 4 x 10mm bolts located
above the baffle.
Remove the 2 x 10mm bolts located
on the left and right half way up
between the outer convection box
and the inner combustion chamber.
Seperate the outer box from the inner
chamber and remove the remaining 2
x 10mm bolts that hold the flue collar
in place.
Slide the outer box into the prepared
opening and affix, connect the flue
adaptor and liner to the flue collar,
screw and seal using an appropriate
sealant.
Reconnect the flue collar using the 2
x 10mm bolts, if fitting with a 4 sided
trim please fit the trim at this time
before the combustion chamber is
reinstalled.
Slide the combustion chamber back
into place and replace the 6 x 10mm
screws, replace the baffle and install
the trim if not already in place.
3
4
5
6
7
8
Operating your stove
Using your appliance for the
first time
• To allow the appliance to bed in, and
fixing glues and paint to fully cure,
only fire the appliance using kindling
and just get hot for at least three fires.
• Before lighting the next small fire
please allow the appliance to return
back to room temperature.
• During these first small fires you may
experience a haze and unpleasant
smell as the paint cures, do not touch
the paint and keep the room well
ventilated.
Please note that during the first firing,
we recommend a small fire is lit and
that you slowly increase the
temperature to enable the various
parts to expand normally.
You may also experience fumes and a
haze being given off by the stove during
the first firing and possibly for the next
couple of firings as the paint cures. This
is normal but please ensure that the
room is well ventilated during this
period.
The appliance should not be operated in
Always ensure that the ash draw is fully located before operation of
the appliance
2
1

mild weather with smokeless fuel. Under
certain weather circumstances e.g. fog
the chimney will not draw sufficiently
and could cause asphyxiation. Either
await better weather conditions or burn
wood only.
In the rare event of a malfunction due to
overheating or a chimney fire, the air
slides should be shut down completely
and the fuel allowed to burn out. In the
event of a chimney fire, once the air
slides have been closed completely, dial
999 for assistance. If the appliance has
overheated, the appliance and flue will
need to be inspected for any damage
before it can be operated again.
Recommended Fuels
Wood: hardwood such as ash, oak and
beech which have been cut for at least 2
years and stored under shelter. The logs
should have a maximum moisture
content of 20%. Maximum log length
400mm, maximum width 125mm.
Smokeless Fuels: below 20%
Petroleum coke content such as
Anthracite, Phurnacite, Maxibrite
suitable for use with a closed heating
appliance.
Prohibited Fuels
Green wood: i.e wood which is less
than 2 years old with a moisture content
of above 20%
Recovered wood: i.e pallets, railway
sleepers etc. These will have been
chemically treated and will pollute the
atmosphere and possibly overheat the
appliance.
Housecoal or Bituminous coal: these
fuels will soot up the airways of the
stove and possibly overheat the
appliance.
Petroleum Based Coke: over 20%
content - this will overheat the appliance
and possibly damage the unit.
Liquid fuels
Paraffin based fire lighters
Always check with your dealer or
directly with the manufacturer as
using the incorrect fuel may
invalidate your guarantee and
damage your appliance.
Instructions for use with wood
• Open the secondary air slider to the
left hand side of the door, and open
the primary air slider to the right hand
side of the door by fully pushing the
levers inwards.
• Lay firelighters or rolled up
newspapers on the grate and add a
small amount of kindling wood to the
top. Place 1 or 2 small logs on the
top.
• Light the newspaper or firelighters
using a long taper and push the door
closed but do not engage the locking
handle fully.
• When the fire is burning fiercely, after a
couple of minutes add more logs and
close the door.
• When the fire has become established,
close the primary air, to the right hand
side of the door, by pulling the lever
fully outwards.
• The burning rate can be altered by
moving the secondary air slider, to the
left hand side of the door - pull the
lever outwards to close down and
push the lever inwards to increase the
burn rate.
• Care should be taken to ensure that
the logs are not placed higher than the
log guard allows.
Instructions for use with
smokeless fuel

• Open the secondary air slider to the
left hand side of the door, and open
the primary air slider to the right hand
side of the door by fully pushing the
levers inwards.
• Lay firelighters or rolled up
newspapers on the grate and add a
small amount of kindling wood to the
top. Place a small quantity of
smokeless fuel on top.
• Light the newspaper or firelighters
using a long taper and push the door
closed but do not engage the locking
handle fully.
• When the fire is burning fiercely, after a
couple of minutes add more
smokeless fuel and close the door.
• When the fire has become established,
close the secondary air by 50%, to the
left hand side of the door, by pulling
the lever outwards.
• The burning rate can be altered by
moving the primary air slide, to the
right hand side of the door - pull the
lever outwards to close down and
push the lever inwards to increase the
burn rate.
• Care should be taken to ensure that
the firebox is not overfilled with
smokeless fuel - it should be no higher
than the log guard.
Re-fueling
When refueling the stove always refuel
onto a bed of hot embers, fully open
the secondary and primary air controls
until the new fuel is well alight, before
adjusting the air controls for the desired
setting.
If there is insufficient burning material in
the firebed to light a new fuel charge,
excessive smoke emission can occur.
Refueling must be carried out onto a
sufficient quantity of glowing embers
and ash that the new fuel charge will
ignite in a reasonable period. If there are
too few embers in the fire bed, add
suitable kindling to prevent excessive
smoke.
Fuel overloading
Never overload the stove - it will work
very well with two medium sized logs.
The amount of fuel specified in this
manual should not be exceeded,
overloading can cause excess smoke.
Operation with door left open
Operation with the door open can cause
excess smoke and overfirring of the
appliance. The appliance must not be
operated with the appliance door left
open except as directed in the
instructions.
Dampers left open
Operation with the air controls or
appliance dampers open can cause
excess smoke. The appliance must not
be operated with air controls, appliance
dampers or door left open except as
directed in the instructions.
Never leave the stove unattended
until the new fuel is well alight.
Persistent fume emission is dangerous
and must be investigated.
If fume emission persists, open doors
and windows to ventilate the room and
let the fire die out. Have the chimney
inspected for blockages and clean if
required. Do not relight the fire until the
cause has been found. We recommend
that you seek professional advice.
This appliance has been designed to be
burned with the door closed at all times
other than when refueling.
It should not be operated as an open
fire.
Typical refueling intervals for wood is 1
hour and smokeless fuel is 1 hour.

Maintenance
Daily Maintenance
• The grate should be cleaned regularly
and the ash pan emptied daily.
Do not empty the ashpan when hot,
please note that the glove provided is
not intended for emptying hot ashes,
never leave hot ashes inside the
property, always dispose of the hot
ashes safely outdoors.
Never allow the ash in the ashpan to
overfill allowing ash to be in contact
with the underside of the grate.
This will overheat the grate and cause
premature wear and distortion.
Periodic Maintenance
• The chimney should be swept at least
once a year together with the flue pipe
connection. Care should be taken to
ensure that there is not a build up of
soot on the baffle and in the airways of
the appliance.
• If the appliance has not been operated
for long periods, the flue should be
inspected and swept before use to
ensure there are no blockages within
the flue.
• The internal vermiculite panels of the
appliance should be checked regularly
for soundness. If any wear and tear is
found, we recommend these parts are
replaced immediately.
• Check the rope door seals are intact
and are not worn. These should be
replaced on an annual basis to ensure
the correct operation of this appliance.
• The glass can be cleaned using a soft
damp cloth and window cleaner or a
stove glass cleaner (available from
your local stockist)
Internal refractory panels
During the normal operation of your
ACR stove, the refractory panels will
experience heating and cooling.
Sometimes minor hairline cracks can
occur. All ACR stoves have a steel or
cast iron structure behind the panels
and therefore even if the cracks get
larger, the stove will still operate safely.
It is advisable to consider replacing the
internal panels when:
• The cracks are greater than 3mm.
• The surface of the refractory panel has
eroded more than 25% of it's original
thickness, or
• When the panel starts to crumble and
fall apart in chunks.
To prevent the issue from happening
and prolong the life of your internal
panels, the homeowner should "burn in"
the refractory panels in the new
appliance by building small kindling fires
to begin with and then gradually
working up to a larger fire. When adding
more fuel to the fire, caution should be
used to prevent excessive mechanical
damage to the panels.
ACR heat products bears no
responsibility for the loss or damage of
any kind to the internal panels during or
after installation or during the normal
operation of the appliance.
Use only replacement parts
recommended by the manufacturer.
We recommend that the appliance is serviced annually by a competent
engineer to ensure it’s continued safe operation.

Troubleshooting
Fire difficult to • Green wood / wet wood Use hardwood logs with a maximum
start / goes out moisture content of 20%
• Logs are too large Use kindling and small logs to start the
fire and once established use split logs
• Not enough primary air Open air control
• Insufficient draft Check the flue is not obstructed
Fire burns too quickly • Too much draft Reduce the air control
• Excessive draft Install a draft stabiliser
Smokes on initial • Flue is cold Burn paper and kindling to increase
lighting heat in flue
Smokes while burning • Insufficient draught Check the flue is not obstructed
Low heat output • Poor quality wood Use seasoned Hardwood (this has a
Higher calorific value)
Problem Probable Cause Action Recommend
Commissioning Check List
Ensure the serial number has been recorded on the front of this manual for any
future use
Ensure the door seals are in good condition and that the glass is secured correctly
in the door (do not over tighten the glass as this will prohibit its expansion and
could cause the glass to crack)
Ensure that all internal components are fitted correctly (these may have shifted in
transit)
Ensure that the appliance operates correctly during the first firing
Ensure the customer is aware that fumes may be given off during the first firings
as the paint cures
Advise the customer on the safe operation of the appliance
Leave the instruction manual, operating tool (if included) and glove for the
customer.
Record the flue draught reading of the appliance
Please tick boxes when each procedure is completed

Parts Information
1 LD/T/550 Four sided trim attachment
2 TB2-07-00-00 Three sided trim
3 TB-03-10-00 Handle
4 TB2-03-00-00 Door (no rope or Glass)
5 S/4/460X380 Glass
6 TB-03-08-00 Glass clip (four required)
7 07BL6757-08-00-00 Multifuel cast iron grate
8 TB2-04-00-00 Log guard
9 TB2-05-00-00 Ashpan
10 TB2-02-11-04 Primary air control slider
11 TB-02-15-00 Air control slider linear spring
12 TB2-06-06-00 Right side accumote panel
13 TB-06-02-00 Right bottom accumote base panel
14 TB-02-14-00 Air control slider linear spring
15 TB2-02-11-04 Secondary air control slider
16 TB2-06-04-00 Left side accumote panel
17 TB-06-02-00 Left bottom accumote base panel
18 TB2-06-03-00 Lower accumote baffle
19 TB2-02-17-00 Upper steel baffle
20 TB2-06-01-00 Rear bottom accumote base panel
21 TB2-06-03-00 Rear tertiary accumote panel
22 TB2-02-00-00 Combustion chamber
23 TB2-02-11-05 Air control slider cover plate (two required)
24 TB2-01-00-00 Outer convection box
25 TB-01-08-00 Flue collar
Not shown TB2-02-14-00 Rear direct air intake collar
Not shown ACR-9.5-Rope Door sealing gasket (9.5mm (2m needed)
Not shown ACR-10x1-Rope Glass / collar sealing gasket (10 x 1mm (glass 2m / collar 1m)
Not shown ISO 7380-1 M5 x 8 Glass screws
Not shown ISO 7380 M5 x 10 Handle screw
Diagram No. Part No. Description
4
6
7
89
10
20
11
24
5
23
22
19
17
12
1
13
23
21
14
15
16
18
25

Warranty Information
The specifications within this document are provided for information purposes only and are
under no circumstances binding.
10
YEAR
10
YEAR
WARRANTY
With the aim of constantly
improving our products, all
modifications considered
necessary may be made without
notice.
This manual is correct at time of
printing.
Our appliances are guaranteed
against faults and hidden defects
subject to the following
conditions:
The appliance must have been
installed by a registered competent
installer (e.g. HETAS) or inspected
by local authority Building Control.
The appliance must be installed
and operated in accordance with
our instruction manual.
All Stoves are covered by a 10 year
warranty which covers all stove
body castings / stove body steel
panels. It does not include
consumable items such as grates,
firebricks, vermiculite panels,
baffles, log guards, door rope seals
and glass, ashpan runners,
painted/enamel finishes. This 10
year warranty is only applicable
when the stove is purchased from
one of our recommended retailers.
If a stove from any of our brands is
purchased from a non-
recommended retailer then only a
12 month warranty will be
applicable as outlined below.
All stoves are covered by a 1 year
warranty when purchased through
a non-recommended retailer. The
warranty covers the stove body
castings only and does not include
consumable items such as grates,
firebricks, vermiculite panels,
baffles, log guards, door rope seals
and glass, ashpan runners,
painted/enamel finishes.
For full warranty exclusions and
limitations please see website.
Your statutory rights are not
affected by this warranty.

Warranty Claim Form
In the unlikely event of a warranty claim, please complete the below claim form
and return it to your supplying dealer:
Customer Name:
Customer Address:
Postcode:
Daytime Tel: Mobile Tel:
Model Name: Model Number:
Serial Number: Date of purchase:
Date of installation:
Installer’s Name and address:
Installer’s Registration Number:
Building Control Certificate Number:
(if not installed by a registered competent installer)
Dealer Name and address:

ACR Heat Products Limited, Unit 1, Weston Works,
Weston Lane, Tyseley Birmingham B11 3RP, England.
• Tel: [phone] • Fax: [phone]
• E-mail: [email protected] • www.acrheatproducts.co.uk