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Haas-Sohn FARUM Handleiding

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grate, a barrier is usually provided, to prevent from burning pieces falling out or onto the
door (front glass). Under the grate, there is a space designed for ashpan. The remaining
space at the bottom part of the fireplace stove may be used for spare fuel.
Fireplace stove casing is made of steel panels, ceramic tiles or lined of thick tiles. The
fireplace stove steel construction is protected with special refractory paint.
A part of the fireplace stove system is a warm water exchanger. It is welded of steel pipes,
thickness 4 - 5 mm. The exchanger may be an integrated part of the fireplace stove or may
be removable. Such removable exchanger is screwed to the fireplace stove. If you need to
remove it, you blind the connecting point. This way, you modify the fireplace stove into a
purely air heating system.
The outlets of the heating water are situated on the rear side of the exchanger. The hot
water outlet is marked in red. The reverse (cooler) water is marked in blue.
Caution! The fireplace stove is not designed for continuous heating but for
periodical – interrupted (i.e. temporary) operation.
2. BURNING PROCESS
2.1. Fuel quantity and firing process adjustments
Burning wood, wood cakes (or coal cakes – optional) in the fireplace stove is based on
burning through the fuel, which means that such firing takes place throughout the whole go
of the fuel at a time. In order to provide optimal conditions for easy kindling and burning up,
you need enough air being led under the fuel in fire, through the grate: this is the so-called
primary air, and it must be always controllable. By increasing temperature of the fuel
burning through, certain gaseous components of the fuel evolve that – unless additional air
is supplied – would be of no avail in terms of heat energy: therefore, additional air must be
provided at the flame level where the firing process connected with those gaseous
components may continue. Now, at this stage, the primary air is – in fact – not necessary,
while secondary air supply is required, or tertiary air may be added as well, respectively.
The secondary air supply, usually adjustable, improves the firing process and contributes to
the door glass self- cleaning. The tertiary air supply is designed for general improvement
of the firing process and is usually fixed (one cannot regulate it anyhow). If the proportion of
the air volumes led into the particular sections of the firing chamber is correct, the burning
efficiency is increased while emission of pollutants in the environment is reduced. The
layout of the air supply regulative elements is shown in the Technical Cart (a part of the
documentation supplied with the fireplace stove).
Our models of fireplace stove may reach up to 85% efficiency – which means top
performance.
The heating capacity of the heating device depends on the fuel quantity burnt per defined
time, fuel quality and firing process efficiency. Using the Chart 2 (heating values) may help
you to make a picture of attainable capacity: let’s assume that you burn 1 kg of wood per
hour, wood humidity is 20%. Further, with higher wood moisture its heating capacity goes
down.
In the testing room conditions, adjustability of the heating device was tested, within 30 –
100% of nominal performance. For the regulation, the chimney effect and the fuel quantity
were applied. In practice, the heating capacity may be regulated by means of air supply
regulating elements (especially the primary air inlet). There is no simple and explicit way to
determine the firing process adjustment by means of regulators. There are many aspects to
consider – fuel moisture, type of fuel, chimney effect, exterior pressure conditions, etc.
Therefore, the firing process (the flame intensity and quality) should be re-adjusted for
particular conditions.
You will be able to adjust the firing process to achieve best efficiency after a short time of
operation. A detailed chart showing how to adjust the air supply regulating elements is
included in the technical specifications. The figures in the chart are the testing results
verified by the State Testing Laboratory. The Chart 1 presents just general information for
air supply adjustment.
Primary air Secondary air Tertiary air
Fuel Fuel quantity
Adjustable Adjustable No adjustment
wooden
logs
wood
cakes
2 - 3 logs (approx. 2 – 3
kg)
2 - 4 logs (approx. 2 – 3
kg)
Open wide
Fixed adjustment
at installation
coal cakes
2 - 3 logs (approx. 2 – 3
kg)
Closed or open
(depends on local
conditions)
half-open
Fixed adjustment
at installation
Chart 1
Our tips for wood burning
Any time you set the fire, let the primary air regulator open long enough to allow the fuel
burning properly.
Before you re-load, it is recommended to open the primary air regulator wide.
While burning wood, make sure the wood is dry, maximum moisture 20%.
• In order to use the optimal exchanger performance, it is recommended to load and
maintain the wood during the operation just on the grate.
Our tips for coal cake burning (selected models only)
To achieve optimisation of the firing process, load the cakes directly onto the grate holes:
this way, you support the burning in best possible way.
Make sure you do not overload: for the heat capacity you may use, i.e. to maintain the heat,
a couple of cakes is enough: otherwise the device would suffer from excessive heat. Coal
cake fuel efficiency may reach 6 kWh/1 kg, i.e. by some 40% more than wood!
2.2. Fuel
In fireplace stoves, you may burn logs, wood cakes and coal cakes (some models only).
The moisture of the wood to be burnt should be lower than 20%, optimally 10%. The rule of
thumb is: the less water in the fuel, the higher heating capacity you achieve. For the
recommended wood moisture, you may reach it safely if you store the wood in a well
ventilated shelter for at least two years. The water content in coal cakes should be
specified by the manufacturer. The cakes should be stored in a dry room otherwise they
disintegrate. It is recommended to store the wood intended for burning in pieces approx. 3-
6 cm (diameter), 20–30 cm (length). It is forbidden to load and burn coal or charred
coal. In the fireplace, never burn flammable liquids or waste. It is forbidden to burn
papering, chipboards, plastic materials, penetrated wood, wood shavings or saw dust.
Burning such materials not only is detrimental to the environment but shortens the service
life of the heating device as well: you might seriously damage the device or the chimney as
well.
Note: The bark, a part of wooden logs, is no issue at all.
Fuel efficiency: selected types of wood at moisture 20%
Wood Fuel efficiency
kWh/m3
Fuel efficiency kWh/1
kg
Weight kg/(m3)
Spruce, fir 1957 4,0 485
Larch 2461 4,0 610
Pine 2280 4,0 565
Oak, beech 2743 3,8 726
Chart 2
6 7
3 …

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