Kostrzewa Compact Bio 16kW Manual De Uso página 81

5. Design guidelines
Tip:
Connect the flue ducts without any loads and stresses:
• seal the flue duct
• the flue must be opened upwards and lead horizontally at least 1 metre
over the roof surface (with a rain cap)
• flue diameter must be selected in accordance with the flue liner manufac-
turer's requirements
• estimate cross sectional area of a circular flue is calculated using
Redtenbacher's equation::
A = 2,6 * Q / (n * H^0,5)
where:
A – flue cross section (m ];
2
Q – boiler heat output (kW);
n – coefficient within the following range 900 - -1880 (n = 900 for wood);
H – flue height [m].
CAUTION!
The installed flue system requires commissioning
and inspection of the following:
• flow capacity
• gas tightness
• draught
• connection and conformity with the design
• standard height above the roof
• environmental protection standard requirements
• installation conformity with the design and as-built documentation
• valid certificates for structural, insulation and mounting
materials used for installation.
The device has to be commissioned
by authorized personnel with a report.
Experts in biomass heating
5.F Fuel quality requirements
Pellets
Sawdust granulate (pellets) made to EN 14961-2:2011 – Class A1 are the basic
type of fuel used in the Compact Bio boiler 2011 – Class A1:
• diameter: 6 ± 1 mm ; 8 ± 1 mm
• length 3.15 ≤ L ≤ 40
• moisture content ≤10%
• ash content ≤0.7%
• calorific value 16.5 – 19 MJ / kg
• density ≥600 kg/m
3
Oats / Pellets
The Compact Bio boiler is fitted with a burner grate for the combustion of oats
and wood pellets mixture (50:50 ratio). Oats moisture content ≤12%.
Wood
Additionally, the Compact Bio boiler may be fitted with cast iron grates for
burning pieces of wood. Wood grate installation is described in 7.M.
In order to achieve the nominal power of the boiler, use dry wood with the max.
moisture content of up to 20%, which is equivalent to 18 months of drying the
wood under cover. Using larger elements (chopped into thick pieces) will prolong
the burning of one load to up to 8 hours.
CAUTION!
Use fuels from reliable sources only. The fuels must have
a suitable moisture content and low proportion of fines.
Wood pellets should not contain mechanical impurities
(stones etc.) which may affect the combustion process and
damage the device. Kostrzewa shall not be held liable for any
damage or incorrect combustion process as a result
of using unsuitable fuels.
Failure to comply with the fuel quality requirements may result in damage to
the heating system components (e.g. boiler, feeder) and is not covered by the
manufacturer's liability. It may invalidate the warranty and result in additional
charges in case an authorised service centre is involved.
Compact Bio / Compact Bio Luxury User Manual – EN 07.15
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