HASE MERIDA - User manual

Merida
Bedienungsanleitung / Mode d´emploi
Istruzioni operative / Instructions for use / Bedieningshandleiding

52
Dear Hase customer,
In deciding on a Hase stove, you have purchased a top quality
product. It goes without saying that we only use first-rate
materials and process them with superior craftsmanship
and the greatest care and precision. At our headquarters in
Trier, Germany, we put our love of detail into every stove we
develop and manufacture, thus ensuring that they meet the
highest standards in design, functionality, and eco-friendliness.
The well-balanced design, state-of-the-art production
processes, as well as our efficient and environmentally-friendly
combustion technology will let you keep enjoying your Hase
stove for years to come.
Please read carefully through these operating instructions.
They provide important instructions and offer useful tips for
spending cosy hours around the fire.
We hope you will enjoy your new HASE stove.
Yours sincerely,
Hase Kaminofenbau GmbH
Contents Page
1. General Information ........................................................52
1.1. Definition of Safety Notes.................................52
1.2 Proper Use............................................................53
1.3 Safety Instructions ..............................................53
2. Control Elements..............................................................54
3. Installation Conditions and
Relevant Building Regulations.......................................55
4. Safety Distances................................................................55
5. Installation..........................................................................55
6. Chimney.............................................................................56
7. Flue Pipe Connection.......................................................56
8. Butterfly Valve....................................................................56
9. The Right Fuel....................................................................56
10. Regulating the Combustion Air......................................57
10.1 Primary Air..........................................................57
10.2 Secondary Air ....................................................57
11. Fuel Load Sizes and Thermal Output ...........................57
12. Initial Operation................................................................58
13. Lighting the Fire................................................................58
14. Adding Fuel / Heating at Nominal Thermal Output .59
15. Heating with Brown Coal Briquettes............................59
16. Banking the Fire and Raising the Temperature..........59
17. Heating at Low Thermal Output....................................59
18. Emptying the Ash Drawer...............................................60
19. The Combustion Process................................................60
19.1 Drying Phase .....................................................60
19.2 Degasification Phase........................................61
19.3 Burn-off Phase...................................................61
19.4 Expansion Noises..............................................61
20. The Chemistry of Wood..................................................61
21. Contribution to Environmental Protection..................61
22. Evaluating the Combustion Quality..............................61
23. Wood Moisture Content and CalorificValue...............62
24. Storing and Drying Wood...............................................62
25. Cleaning and Maintenance.............................................62
25.1 Steel Cladding...................................................62
25.2 Flue Gas Paths..................................................62
25.3 Ceramic Glass Panels and Windows............63
25.4 Fire Box Lining..................................................63
25.5 Sealing Strips.....................................................63
26. Troubleshooting................................................................64
27. Technical Data...................................................................65
28. CE Declaration of Conformity........................................66
1. General Information
This section contains important information on using this
technical documentation. Utmost care was taken in preparing
this document. Nevertheless, suggestions for improvement
and comments regarding any errors are always welcome.
© Hase Kaminofenbau GmbH
1.1 Definition of Safety Notes
WARNING!
This symbol alerts you to a potentially
hazardous situation. Non-compliance with this
warning can cause severe injuries, or even
death.
CAUTION!
This symbol alerts you to a potentially ha-
zardous situation. Non-compliance can cause
damage to property or injuries to persons.
NOTE!
Provides additional tips about using the stove
as well as useful information.
ENVIRONMENT!
Sections marked with this symbol provide
information about safe and environmentally-
friendly operation as well as environmental
laws and regulations.

53
1.2 Proper Use
The stove may only be used for heating suitable living spaces
and may only be fuelled with wood (firewood) and brown
coal (lignite) briquettes.
WARNING!
Any other use is considered improper use
and can cause severe damage to the product
or even fatal injuries to persons.
The manufacturer‘s warranty does not apply to any damage or
injury caused by improper use of the stove.
1.3 Safety Instructions
WARNING!
Never use spirits, petrol, or other flammable
fluids to light the stove. During
operation, the external surfaces of the stove
become very hot, and thus the entire
stove poses a burn hazard. To ensure the safe
operation of this stove, we are enclosing a
glove with the delivery of your stove.
Children should never be left unattended near
the stove while it is in operation. There is a
burn hazard.
Do not wear loose-fitting and/or easily flam-
mable clothes when adding fuel to the fire.
Do not burn improper or unsuitable materials
such as chipboard, varnished, laminated, trea-
ted or plastic-coated wood, waste, refuse, etc.
These materials are harmful to the environ-
ment and can damage the entire combustion
system and stove.
Do not store flammable or combustible materi-
als or fluids (e.g., spray cans) in the immediate
vicinity of the stove.
If the air slider is closed while the fire is
burning or the embers are still glowing, the
flammable gases still present in the stove
can burn off explosively (deflagration), thus
causing severe damage to the stove.
Never put laundry or other objects on the
stove to dry them. Do not place heat-sensitive
materials on or near the stove.
Make sure that clothes drying racks and
other similar objects are placed at a sufficient
distance away from the stove.
Never put your life at risk in a chimney or
house fire. Your own safety always takes
precedence!
Modifying or making any changes to the stove
is not permitted. Only original
replacement parts from Hase Kaminofenbau
GmbH may be used.
CAUTION!
Be sure to connect the stove to a chimney that
meets the applicable regional and national
regulations and standards.
For safety reasons, make sure that all joints
and connections between the stove and chim-
ney are sealed tightly.
Improperly installed or leaking flue gas pipes
pose a particular risk due to smoke emission
and/or fire hazards. Please make sure to consult
a licensed specialised company to determine
the correct arrangement and installation of the
pipes.
We recommend using a lined wall sleeve and
installing a connecting piece with a butterfly
valve.
Please comply with the applicable country-
specific legal regulations.
Within a radius of 20 cm and around the
connection opening, you are legally required
to remove all flammable, combustible, or
heat-sensitive materials located on or inside
the wall, and replace them with non-flammable
materials. This regulation applies to Germa-
ny only. Outside of Germany, the pertinent
national fire protection regulations have to be
complied with.
NOTE!
In case of a chimney fire:
- Ring the emergency phone number to alert
the fire brigade!
- Notify your chimney sweep!
- Never extinguish the fire with water!
- Remove any flammable objects located in the
vicinity of the chimney!
- Wait for the fire brigade to arrive!

54
2. Control Elements
Fire box door handle
Ash compartment
with lid
Secondary air slider (II)
Primary air slider (I)
Grate slide

55
3. Installation Conditions and Relevant Building
Regulations
The stove must be installed in accordance with the instructions
and requirements stipulated by the respective national and
European standards and local regulations.
In Germany, the stove must be registered with the local master
chimney sweep for inspection prior to initial operation.
4. Safety Distances
Within a radius of 80 cm in front of and 25 cm around the
stove, flammable, combustible, or heat-sensitive materials
(e.g. furniture, wood or plastic panelling, curtains, etc.) are not
allowed to be located in the heat radiating area of the fire box
window (Fig. 1).
With regard to flammable materials beyond the heat radiating
area, a safety distance of 10 cm at the sides of the stove and
10 cm behind the stove has to be adhered to (Fig. 1).
WARNING!
Flammable flooring materials (e.g., wood,
laminate, carpeting,) must be protected with a
floorplate made of non-combustible material
(e.g., tiles, safety glass, slate, or sheet steel).
The size of the floorplate must be larger than
the base of the stove by at least 50 cm in front
and at least 29 cm at the sides of the stove
(Fig. 2).
5. Installation
Check to make sure that the load-bearing capacity of the
installation surface is sufficient. If necessary, using a floorplate
to distribute the load can increase the load bearing capacity.
Check whether the room in which the Merida will be installed
is adequately supplied with enough fresh air. If the windows
and doors are tightly sealed, the necessary supply of fresh
air may not be ensured, which can interfere with the draught
capability of the stove and chimney.
If additional combustion air inlet openings are required, they
are not permitted to be closed or blocked.
CAUTION!
Simultaneous operation of the stove with
ventilation systems and/or exhaust hoods can
cause negative pressure to build up in the
room where the stove is installed, which can
lead to problems such as flue gas escaping
from the stove.
NOTE!
To ensure that air is not drawn out of the room
where the stove is installed, we recommend
using a window contact switch to lock exhaust
hoods that guide the air to the outside.
Dimensions in cm
Dimensions in cm
10
25
80
80
10
10
29 29
50
fig. 1
fig. 2
R
a
d
i
a
t
i
n
g
A
r
e
a
R
a
d
i
a
t
i
n
g
A
r
e
a
floorplate

56
6. Chimney
The Merida has to be connected to a suitable chimney with
a minimum effective chimney height of 4.50 m. It can be
connected to a chimney to which other fireplaces are already
connected. The chimney cross section should correspond to
the flue pipe cross section. If the effective chimney height is
too low and/or the chimney cross section is too large or too
small, the draught capability of your stove can be impaired.
The Merida stove requires a 12 Pa output pressure (chimney
draft). At higher output pressures, the stove emissions
increase, which puts a high load on the stove and can lead to
damage.The Merida stove has a maximum permissible output
pressure of 35 Pa. To limit the output pressure, a butterfly
valve (Fig. 4) or output pressure limiter can be used.
7. Flue Pipe Connection
The Merida has to be connected to the chimney with a flue
pipe with an inside diameter of 15 cm. Please ensure that
all pipe pieces are tightly fit at the connection junctions. We
recommend using elbow pipes with cleaning hatches.
CAUTION!
The flue pipe must be well sealed at the
chimney entrance and cannot project into the
inner cavity of the chimney; otherwise the flue
venting will be impaired (Fig. 3).
8. Butterfly Valve
The butterfly valve (Fig. 4/1) is an optional control element. It
is fitted in the flue pipe and used to regulate the flue gas flow,
and can thus slow down the burning-off process. When the
handle’s position is diagonal to the flue pipe, the flue gas flow
rate is turned to minimum. We strongly recommend installing
a butterfly valve to reduce the output pressure. Please comply
with the country-specific legal regulations.
1
fig. 4
NOTE!
Make sure butterfly valve (Fig. 4) is open
before opening the fire box door during the
burning phase.
9. The Right Fuel
Only fuels which generate low quantities of smoke may be
burned in stoves. Only fuel in the form of natural, untreated
wood logs or bricks, including the adherent bark, can be used
for the Merida.
For the most attractive stove fire, use beech wood logs. If
other types of wood are used, such as oak, birch, pine or
larch, we recommend adding beech wood for picturesque
dancing flames. Brushwood and small pieces of wood are
good kindling materials.
Highly resinous coniferous wood (e.g. spruce, pine, fir) tends
to emit flying sparks and leaves behind a fine layer of flue ash
that can swirl up when the fire box door is opened.
The firewood should be stored for at least two years to achie-
ve the required maximum residual moisture content of 20%.
CAUTION!
If the wood used as fuel is too moist, water
vapour can condense and damage the stove. In
addition, it will reduce the thermal output.
CAUTION!
Burning, e.g.:
- damp or moist wood(residual moisture
content over 20%),
- varnished, laminated, treated, or plastic-
coated wood,
- wood treated with wood preservatives,
- household waste,
- paper briquettes (contains pollutants such
as cadmium, lead, zinc), or

fig. 3

57
- any flammable fluids (including methanol
and ethanol) as well as any fuel pastes
or gels
is not permitted.
ENVIRONMENT!
Combustion of the materials listed above not
only gives off unpleasant odours, but also
generates emissions that damage the environ-
ment and are harmful to health.
Combustion of non-permitted fuels constitutes
a violation of the German Federal Immission
Control Act.
Improper fuels and their combustion residues
can be detrimental to the functioning and ser-
vice life of the stove and chimney – use of such
fuels voids both the warranty and guarantee.
10. Regulating the Combustion Air
To effectively guide the required volume of air to the right
places, a customized air flow system has been developed for
your Hase stove.
When lighting thefire and adding fuel, you can use theprimary
air and secondary slider to regulate the combustion air.
10.1 Primary Air
The primary air is guided through the grate and into the fire
box from below, which allows the stove to reach the required
fire box temperature more quickly during the warming up
phase.
10.2 Secondary Air
The secondary air is guided into the fire box from the top, via
air ducts in the stove. It supplies the fire box with the volume
of preheated oxygen necessary to completely burn off the
wood gas and reduces the build up of soot on the fire box
windows.
For regulating the secondary air, the following general rule
applies: a small fire requires little secondary air; a large fire
requires ample secondary air.
WARNING!
If the secondary air slider (Fig. 5/II) is closed
too tightly, there is a risk that the flue gases
will not burn completely (smouldering fire),
that soot will build up on the fire box window,
or that the amassed wood gases will burn
explosively (overfiring/deflagration).
Burning wood when the primary air slider
(Fig. 5/I) is opened too wide poses the risk of
overheating the stove (forge fire effect).
CAUTION!
During operation, the secondary air slider
(Fig. 5/II) should never be completely closed.
In contrast, however, the fire box door and ash
compartment must always be tightly shut.
11. Fuel Load Sizes and Thermal Output
The thermal output depends on the amount of fuel you put
in the stove. When adding more fuel, please do not exceed
the maximum fuel load size of 1,7 kg. Exceeding the maximum
fuel load size leads to a danger of overheating, which can
result in damage to the stove and the risk of a stove fire.
NOTE!
To attain a thermal output of approx. 4 kW,
burn wood logs that weigh 0.8 kg and are no
longer than 25 cm in length for about 40 min.
(with brown coal briquettes 2 briquettes
with a total of approx. 1 kg at approx. 60 min)
NOTE!
To attain a thermal output of approx. 2 kW,
burn wood logs that weigh 0.4 kg and are no
longer than 25 cm in length for about 35 min.
(with brown coal briquettes 1 briquette with
a total of approx. 0,5 kg at approx. 55 min).
fig. 5
Primary air slider (I) Secondary air slider (II)
grate slide

58
The Merida is intended for intermittent operation, please only
apply one fuel layer at a time.
In Austria and Switzerland the Merida is only authorised to
burn firewood.
12 . Initial Operation
NOTE!
During shipment, condensation moisture can
accumulate in the stove’s interior, which may
possibly lead to the appearance of
condensation or water on the stove or flue
pipes. Please dry off these damp areas imme
diately.
The surface of your stove was treated in a sandblasting
machine before applying the colour coating. Despite careful
and thorough inspection, there may still be some residual
material in the stove body, which can fall out when your stove
is being installed.
NOTE!
To prevent any damage, please immediately
vacuum up these small steel pellets with a
vacuum cleaner.
The first time a stove is operated, the heat development
causes the emission of volatile components from the coating,
sealing strips and lubricants, and smoke and odours can
occur.
At a higher combustion temperature, this one-time process
can take between 4 to 5 hours.
To achieve this higher combustion temperature, please
increase the fuel quantity recommended
in Section 14, „Adding Fuel/ Heating with NominalThermal
Output“, by approximately 25%.
CAUTION!
To prevent adverse effects on health, nobody
should stay in the room(s) during this process
unless absolutely necessary. Make sure the
room is well-ventilated and open the windows
and outside doors. If needed, use a fan for
faster air circulation.
If the maximum temperature is not reached during the first
heating operation, you may notice an odour for a short period
of time the next time the stove is used as well.
13. Lighting the Fire
The firing up phase should be as short as possible, since
higher emissions can occur during this phase.
The slider settings described in Table 1 (see figure on the
right) are recommendations that were determined under
conformance testing conditions, in compliance with the
relevant standard. Depending on the weather conditions and
the draught capability of your chimney, accordingly adjust the
slider positions for your Merida to the local conditions.
NOTE!
The Merida may only be operated when the
fire box door is closed; the fire box door may
only be opened to add fuel.
WARNING!
Never use spirits, petrol, or other flammable
fluids to light the stove.
Lighting the Fire
Procedure Position of Control
Elements
Completely open primary
and secondary air.
Pull primary and secondary air
slider all the way out. (fig. 6)
Open fire grate. Pull out fire grate slider.
Pile up any remaining ash
and unburned Charcoal
into the centre of the
combustion chamber.
Place 2-3 small logs into
the middle of the fire box;
stack approx. 0.5 kg of dry
wood chips on top.
Light the ignition material
at several places.
Open fire box door.
Close fire box door.
Tab. 1
(I) (II)
Fig. 6

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14. Adding Fuel / Heating at Nominal Thermal Output
More fuel should be added to the fire when the flames from
the previous burning off phase have just gone out.
16. Banking the Fire and Raising the Temperature
Keep the stove set as described above until the brown coal
briquettes are thoroughly burnt. Then close the primary air (I)
and the fire grate.Slide the secondary air slider (II) to position
2/3.
NOTE!
While the stove is in operation, the secondary
air slider should never be completely closed.
To raise the temperature of the fire, stir up the rest of the
glowing embers with the fire grate slider. Open the primary air
(I) and add new logs to the fire.
17. Heating at Low Thermal Output
(during Transitional Seasons)
You can vary the thermal output of your Merida by adjusting
the quantity of fuel used.
NOTE!
Do not attempt to slow down the combustion
by reducing the air supply. When heating with
wood, this can result in an incomplete burning
process and pose the risk of an explosive-like
combustion of the accumulated wood gases
(deflagration)
15. Heating with Brown Coal Briquettes
Wood should be used for the warming-up phase and when
adding fuel for the first time, see “Warming-up Phase”. As
soon as a basic glowing firebed is reached, place 2-3 brown
coal briquettes on the grate in the middle of the firebox, kee-
ping a finger’s width between the briquettes, and use the
following procedure and settings:
Adding Fuel / Heating at Nominal Output
Procedure Position of
Control Elements
Adjust primary and
secondary air.
Close primary air slider
(I), set secondary air slider
(II) to position 3. (fig. 7)
Close fire grate. Push in fire grate slider.
Add two logs weighing approx.
0,8 kg in total. Place logs with
one end to the front of fire box.
Only add a single layer of fuel.
Open fire box door.
Close fire box door.
Tab. 2
Heating with Brown Coal Briquettes
Procedure Position of
Control Elements
Open primary air completely.
Adjust secondary air.
Pull primary air slider (I)
all the way out (fig. 8)
Set secondary air slider (II)
to position 2. (fig. 8)
Open fire grate. Pull out fire grate slider.
Tab. 3
Fig. 7
(I) (II)
Fig. 8
(I) (II)

60
Heating with Wood at Low Thermal Output
Procedure Position of
Control Elements
Close primary air
Adjust secondary air.
Push in primary air slider (I)
as far as it will go. (fig. 9)
Set secondary air slider (II) bet-
ween position 2 and 3. (fig. 9)
Close fire grate. Push in fire grate slider.
Add one log (weighting
approx. 0.4 kg total) into
the middle of the fire box.
Tab. 4
18. Emptying the Ash Drawer
As a safety precaution, please make sure to wait until the
ashes are cold before you dispose of them. While the ash
collects during the fire, the lid is located under the ash drawer.
Remove both the ash drawer and the lid located underneath
it. Slide the lid onto the ash drawer so that it is closed; this
prevents ashes from flying around, which in turn means your
home stays clean. To place the ash drawer back into the stove,
proceed in the reverse order.
CAUTION!
Piled up ashes can impair or even block the
supply of primary air supply to the stove.
Please ensure that the air supply path for the
primary air between the ash drawer and the
bottom of the ash compartment remains clear.
19. The Combustion Process
EA piece of wood burns in three phases. In a wood fire,
however, these processes occur both consecutively and
simultaneously.
19.1 Drying Phase
The moisture still remaining in the air-dried wood (approx.
15 - 20%) is evaporated. This takes place at temperatures of
approx. 100°C. For the evaporation to occur, the wood must
be supplied with heat during the warming up phase; this is
achieved by using small wood logs.
Heating with Briquettes at Low Thermal Output
Procedure Position of
Control Elements
Adjust primary air.
Adjust secondary air.
Set primary air slider (I)
to position 3. (fig. 10)
Set secondary air slider
(II) between position
1 and 2. (fig. 10)
Place 1 briquettes
on the fire grate.
Open fire grate. Pull out fire grate slider.
Tab. 5
Fig. 9
Fig. 10
(I) (II)
(I) (II)