Opus TRIO Specification sheet

OPERATION AND INSTALLATION MANUAL
OPUS TRIO
FIRED BY DESIGN

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Contents
Disposal of packaging
3
Introduction
4
1. Description
4
2. General
5
3. Installation of the Stove and the flue pipe connection
5
3.1. Flue pipe connection
6
3.2. Safety rules
6
3.3. Minimum distances to combustibles
6
4. Technical specifications
7
5. General information about the working of the stove
8
5.1. Starting the stove
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5.2. Suitable materials for lighting
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5.3 Emptying the ashpan
10
5.4 Adjusting the locking mechanism
11
5.5 Cleaning and maintenance
12
5.6 Layout and usage of air regulators
13
6. Malfunction and service
13
7. Common fault finding
14
8. Warranty
16
Opus commissioning checklist
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Opus-Trio-October-2017-V002

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Attention
Check the stove before installation to ensure that there has been no damage to the
functional parts (air regulators, seals, door, chimney connector, etc.) during transportation.
If you have noticed damage, please contact our customer service. The stove must not be
modified in any way.
“The Clean Air Act 1993 and Smoke Control Areas”
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 Wales and Northern Ireland these are authorised by regulations made by Welsh
Ministers and by the Department of the Environment respectively.
Further information on the requirements of the Clean Air Act can be found here:
https://www.gov.uk/smoke-control-area-rules
Your local authority is responsible for implementing the Clean Air Act 1993 including the
designation and supervision of smoke control areas and you can contact them for details
of Clean Air Act requirements”
The Opus Trio has been recommended as suitable for use in smoke control areas
when burning wood fuel when fitted with the approved DEFRA upgrade kit.
Disposal of packaging
The packaging protects the stove from damage during transportation. The packaging
materials can be recycled. The wooden parts of the packaging can be used as firewood.

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Introduction
Congratulations on your purchase of this Opus stove.
This manual will introduce you to the functions and correct operation of the stove. It is
important that your installer takes you through the operation of this stove during their
handover.
Our guarantee is valid only if the guidelines in this manual are carefully followed.
Please keep this manual, in order to remind yourself how to operate the stove before the
winter months.
1. Description
The stove is constructed with welded steel. In the centre is the firebox which is lined with
firebricks.
Beneath the cast iron grate is an ashpan and under that is wood storage.
This stove works on the principle of convection, in which cool air is drawn up from the floor
and warmed between the two outer walls of the stove. This warm air then spreads around
the room.
2. General
National and European standards, local construction regulations, fire protection law and
regulations must be observed.
It must be ensured that the installation room is adequately supplied with fresh air.
If extractor fans are present in the same, or connecting rooms as the stove, additional
ventilation should be given to allow for this.
Calculation of chimney set up should be done according to EN 13384-1 and EN 13384-2
with specific values which can be seen in this manual
under the section 4.
Your stove can be equipped with a connection for the
external air supply (see image 1). The required direct
air kit is available. In a room with controlled ventilation,
the stove can be a connected to an air supply from the
outside. In that case additional pressure monitoring in
the room is required.

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The stove has been built with a self closing door
mechanism. This can be disabled by removing the
spring from under the ash pan.
If the combustion air is being supplied from the
outside, the duct size will need to be increased for
any duct over two metres long or any run containing
90 degree bends. The duct length should not be
longer than 6 metres with no more than three 90
degree bends. The chimney must be able to
overcome the additional resistance of the air intake ducting.
When the stove is out keep both regulators closed, in order for cold air not to be able to
circulate throughout the chimney. However it can be advantageous to open the air controls
some while before lighting the stove to allow warmer air to begin going up the chimney.
Pay attention to the flue pipe.
The chimney draw must be a minimum of 12 pascals.
Due to the cold outside air, condensation can be avoided by insulating the flue pipe.
Your chimney significantly contributes to the proper working of your stove.
Recommendations:
•Working level of chimney: min. 5 meters
•Maximum diameter of flue 160 mm
•Any existing chimney should be examined by an expert
3. Installation of the Stove and the flue pipe connection
3.1. Flue pipe connection
All flue pipe that is used to connect the stove to the chimney must comply with national
regulations. All connections from the stove into the chimney must be firm and tightly
connected.
Be careful that flue pipe does not enter into the free section of the chimney.
Maintain the correct distances specified by building regulations between the flue pipe and
combustible material.
When the stove has a rear flue connection, the Tee cap should be securely attached.
This appliance must never be connected to a shared flue system.
Attention: if the chimney pressure is too low or too high this may cause problems with the
working of the stove.

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Outdoor air supply: if the deviation from the required pressure (section 4) is over 25%,
suitable changes to the chimney should be made.
3.2. Safety rules
During stove installation, you must comply with the safety rules.
The appliance shall be installed on floors with an adequate load-bearing capacity. If an
existing construction doesn't meet these prerequisite, suitable measures (e.g. load
distributing plate) shall be taken to achieve it.
Pay attention to minimum distance required from the wall, combustible materials and to
protection of the floor
3.3 Minimum distances to combustibles
A
800mm
In the area of thermal radiation
B
120mm
Back space between the wall and
stove
C
640mm
Side space between wall and stove

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4. Technical specifications
Stove Model
Trio
Nominal Output
5.0 kW
Efficiency
77.2% (net)
Weight
143 kg
Mean flue gas temperature
254 ºC
Flue gas mass flow
5.3 g/s
Minimum pressure
0,12 mbar
Diameter of flue pipe
150 mm
Diameter of the connection to the outdoor air supply
100mm
Fuel
Wood
Average refuelling interval at nominal output
43 minutes

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5. General information about the working of the stove
Always use a glove
Do not use any flammable liquid fluids for lighting the fire. The door of the firebox should
be opened only when adding fuel, apart from leaving the door slightly ajar during the
lighting phase.
Use only suitable fuels (see section 5.2.).
Check that there is enough fresh air coming into the room. Stoves should only be used by
adults. All parts of the appliance, especially the external surfaces will be hot to touch when
in operation and due care will need to be taken. Make sure that children are never alone
near the stove. Never leave the stove for a long period of time without surveillance.
The stove should be used only according to the instructions in this manual.
The stove has been built with a self closing door mechanism. This can be disabled by
removing the spring from the door hinge.
5.1. Starting the stove
Please pay attention to the minimum space between the stove and flammable objects
when lighting a fire.
1. Primary and secondary controls should be fully open.
If the flue pipe has a flue damper it should also be fully open.
2. Remove enough ash from the grate to let air through but leave some of the ash there.
Put 2-3 firelighters in the centre of the firebox and put on the firewood.
3. Light the firelighters and leave the door slightly open as it prevents condensation on the
cold glass. If the lever below the firebox to the bottom right is pulled fully out then the door
will not fully close leaving sufficient gap to assist in the lighting of the fire. The door handle
will remain out to indicate that the door is not fully closed. Do not leave the stove
unattended when the door is ajar.
4. After approximately 5 to 10 minutes, when the fire is burning fully, carefully open the
door, put 1 to 2 pieces of the wood into the firebox, and then close the door.
5. When all the fuel is properly burning, and the working temperature of the stove is
achieved (after approximately 20-30 minutes), gradually move the primary air regulator
backwards, but ensure that there is still a visible flame.
When the stove is up to temperature and the fire burning well then the primary regulator
can be completely closed.
6. The door should only be opened again when the fuel has burned right down and you
want to put new fuel in.

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If there is insufficient burning material in the firebed to light a new fuel charge, excessive
smoke emission can occur. Refuelling 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.
It is recommended that the secondary air regulator is kept fully open in order for the “glass
cleaning” to be most efficient, and to avoid the glass “fogging”.
7. Use the amount of fuel you place in the stove to regulate the room temperature. When
burning at the nominal output, the stove requires refuelling every 45-50mins with
approximately 1.1kg of wood logs.
To achieve slow combustion, it is necessary to lay logs with one crossed over the other at
45º, the primary air control must be fully closed, secondary air control lever must be
opened at 60mm, or to the DEFRA kit stop if fitted.
8. When adding larger wood it is good practice to put in a couple of smaller bits first as the
larger logs then light faster, so producing less smoke. When adding wood, the primary air
control must always be open, and left open until the new logs have caught fire. At that
point close the primary control and leave the secondary air to facilitate the combustion.
THE STOVE SHOULD NEVER BE FILLED EXCESSIVELY. EXCESSIVE AMOUNTS OF
WOOD OR AIR FOR COMBUSTION CAN CAUSE OVERHEATING AND DAMAGE THE
STOVE.
During the first few times the stove is used, it is possible that it can produce a slight smell
while the paint is curing. This will disappear after a short while. If the smell appears, open
the windows of the room for ventilation.
ATTENTION
THE ASHPAN MUST BE TIGHTLY CLOSED FOR PROPER REGULATION OF THE
PRIMARY AND SECONDARY AIR. If ash is allowed to build up behind the ashpan then it
can prevent the ashpan sealing properly.

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5.2. Suitable materials for lighting
The stove should be used for the combustion of natural wood and wood briquettes.
Some of the best wood for the stove is beech and birch. These types of wood have the
highest burn temperature, and they burn the cleanest, as long as they have been stored in
a dry place for a sufficient length of time.
If the glass window blackens excessively during burning it is usually an indication that the
moisture content of the firewood is too high.
Do not use any of the following:
•Damp wood or treated wood
•Cardboard
•Bark or plywood
•Plastic or other waste
Fresh wood should be cut up and stored 12 to 18 months in open storage, but protected
from rain. Any wood used should have a maximum humidity of 20%.
5.3 Emptying the ashpan
It is recommended to clean out the ash every day.
Be careful that too much ash is not accumulated otherwise there is the danger that, if the
ash reaches up to the grate, it will not cool sufficiently and may get damaged.
Before emptying the ashpan, check if there are any embers left in the ashtray.
Even though the ash is cold from the outside, it is possible that there are embers within the
ash which can lead to a fire in the waste bin.

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5.4 Adjusting the locking mechanism
Lever to open the side panel; this lever must be
carefully pushed forward and upward, and then the
side cover can be moved to the left or right.
In this picture, the foot is displayed with which you
can adjust the stove so that the automatic locking
mechanism can function properly.
5.5 Cleaning and maintenance
The stove can be cleaned only when it is cold.
Pay attention while cleaning your stove not to damage, scratch or break essential parts.
For cleaning steel parts use non-abrasive detergents and a soft rag, and after cleaning
wash it well to avoid the deposit of detergent which can damage material.
Cleaning the glass should be done when the stove is cold, using normal detergent for
washing the glass. In the case of solid deposits that should be removed, we recommend to
use detergents that are sold in stores, and that are intended for that use.
To clean the side glass, it is necessary to open the side panels for access. Please follow
instruction in part 5.4
After washing, wipe over with clean water and if there are condensates, do not wait until
they are dried, rather wipe them immediately.
Attention:The stove paint only achieves its ultimate strength after reaching its rated
temperature a few times.
To avoid damaging the paint, it is recommended to clean the stove surface only when the
paint achieves its ultimate hardness.
It is important to have the chimney regularly checked and cleaned by a qualified chimney
sweep.

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5.6 Instructions on how to access the flue through the stove
Remove grate and base
fire bricks.
Slide outside retaining
bars.
Carefully lift out both side
fire bricks, ensuring the
securing clip remains with
the brick.
Attention, when removing
the second side fire brick,
ensure you support the
throat baffle to prevent it
from being dropped.
Now lower the throat plate
baffle to remove.
Using a 5mm hex key,
unscrew the second baffle
and it's bracket being
careful to support its
weight whilst removing.
You can now sweep
through the stove.
To replace the fire bricks,
please repeat steps 1 – 5
in reverse.

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In case of chimney fire
If the wrong or unseasoned wood is used, it is possible that a chimney fire can occur due
to the accumulation of deposits inside the chimney.
Immediately close all air regulators on the stove and call the fire brigade.
If a chimney fire was to occur, an experienced professional should be employed to check
the entire flue system.
5.6 Layout and usage of air regulators
6. Malfunction and service
In the event of a product malfunction please contact your supplier. If the stove is under
warranty your supplier will take care of the warranty claim.
Regular maintenance of the stove and flue should be carried out by a competent engineer.
Use only replacement parts as recommended by the manufacturer.
Secondary Air
Open
(push)
Close
(pull-out)
Primary Air
Open
(push)
Close
(pull-out)

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7. Common fault finding
Please be aware that in the event of your stove not performing properly, you should always
consult your installer first or a qualified professional. Below is a list of potential problems
and possible causes:
Problem
Possible cause
Starting problems
Burning does not start
Bad quality or wet wood
Too thick wood log
Insufficient primary air
Cold flue pipe
Fire gets choked
Insufficient draft
Obstructed chimney or pipes, butterfly throttle is closed
Burning problems
Too slow fire progression
Bad quality or wet wood
Insufficient primary air
Insufficient draft, low pressure
No ember layer produced
Too thick wood or log
Improper placement of the wood
Fire extinguishes
Too strong or too weak draught
Too brisk flame – not possible
to regulate
Too much combustion air
Too small wood pieces
Ashpan not properly closed
Ash build up behind ashpan
Ashpan sealing rope needs replacing
Sooting
Bad quality or wet wood
Cold flue pipe
Slow burning for longer period
Too long chimney section in cold zone
Chimney fire
Extensive sooting of flue pipe
Insufficient heating
Fresh or too wet wood
Too strong air flow
Improper firebox installation
Stove smoking
Wet or soft wood
Flue pipe obstructed
Flue damper is closed
Operating of closed firebox with door in open position
Contaminated flame baffle and/or connecting pipes
Chimney not according to requirement
Effect of the wind to the top opening
Insufficient air exchange in the room or the mechanical
ventilation interferes (such as kitchen odour extractor)
Extensively contaminated glass
window
Bad quality or wet wood
Not suitable or prohibited fuel
Excessive slow burning

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Weather conditions may affect your stove causing smoke spillage into the room when the
appliance door is opened. On windy days this maybe a result of down draught, or on calm
days, this could be lack of natural flue draught. We recommend contacting your installer
for advice.
Always ensure use of good quality wood at 10-20% moisture content during light up, and
to maintain the fire.
8. Warranty
The warranty cover is effective from when the unit is handed over to the buyer.
In case the commissioning does not take place within 3 months from the date of purchase
then the warranty period starts on the day of purchase of the product, which must be
demonstrated by proof of purchase such as a sales receipt or paid invoice from the seller.
OPUS declines all liability for any accidents due to failure to observe the specifications
contained in the use and maintenance manual accompanying the device. Furthermore,
OPUS declines all liability deriving from improper use of the product by the user (including
heat-shock, overload or misuse of the firebox), unauthorised modifications and/or repairs,
and the use of non-original spare parts or spare parts not designed for use on this product
model.
Duration of warranty is five year(s) on the firebox house, grate, flame baffle, moving parts
(hinges, handle, and fittings).
Please note that the warranty does not cover glues, seals, ceramic glass, and firebricks.

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Opus commissioning checklist
General information
Stove purchased from
Telephone number
Stove installed by
Telephone number
CPS registration with (e.g.
HETAS)
CPS registration number
Installation date
Stove model
Physical checks
Installation is in accordance with the design, including material specification, flue
length and diameter
The installation instructions have been followed
There is no damage to any components
Joints between the appliance and chimney and within the chimney system are secure
and in good condition
The separation of components from combustible materials conforms to this code of
practice
The appliance and chimney can be fully cleaned, once the installation is complete
Components for weatherproofing are installed correctly
Smoke spillage test has been carried out
CO Alarm fitted and tested
Handover
At handover all user instructions should be given to the user and an explanation of the
appliance operation and safety issues should be given. Additionally an explanation of the
correct removal, relocation, and any sealing of the removable/hinged section of the
chimney should be given and all safety issues explained.
Commissioning engineer’s signature*
*By signing this you confirm that all commissioning checks above have passed, and that operation and
maintenance of the appliance have been explained to the customer in full in line with this user manual

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Imported to the UK Firepower, Flightway, Dunkeswell, Honiton, Devon, EX14 4RD, UK, 0844 332 0155, [email protected].uk
FIRED BY DESIGN
www.opusstoves.co.uk