Kostrzewa Compact Bio 16kW Manual De Uso página 80

5. Design guidelines
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5.D Water quality requirements
Water quality affects the life and efficiency of heating devices and the entire
system. Incorrect water parameters will result in the corrosion of heating device
surfaces, transport ducts or lime scale deposits. It may lead to failure or damage
of the entire heating system. The warranty does not cover any damage caused by
corrosion and lime scale deposits.
Strict adherence to the water quality requirements is a precondition for the
warranty.
The water for filling boilers and heating systems must meet the requirements
of relevant standards and regulations.
Required boiler water parameters:
• pH >8.5
• total hardness <20°f
• free oxygen content <0.05 mg/l
• chloride content <60 mg/l
The treatment method for water used in the heating systems must meet the
above requirements. Use of antifreeze additives must be consulted with the
manufacturer (KOSTRZEWA). Failure to comply with the boiler water quality
requirements may result in damage to the heating system components (e.g.
boiler) and is not covered by the warranty. It may invalidate the warranty and
result in additional charges in case an authorised service centre is involved.
5.E Flue system guidelines
The flue system must conform to the relevant
standards and regulations.
The flue system removes flue gas from the boiler room to the atmosphere.
The flue system creates draught determined by:
• temperature gradient between the flue gas temperature and the ambient
temperature (difference in density and pressure)
• flue length
• flue shape (bends, inclination, draught breaker etc.)
• flue cross section
• flue diameter (flue diameter must correspond to the boiler's flue connector
diameter)
• flue internal surface roughness
• flue flow capacity
• flue gas tightness (seals, grouts etc.)
• flue thermal insulation
• changes in ambient conditions (temperature, pressure fluctuations due
to the air flow, roof shape, flue location in relation to building envelope
components etc.)
Experts in biomass heating
The diameter of a duct connecting the boiler with the flue must correspond to
the diameter of the boiler's flue connector. Do not use any reducing couplings of
the boiler's flue connector or the flue. A transition between the flue and the duct
may include a tee with a correct combination of diameters. The flue design must
guarantee that the flue gas temperature at the entire flue length to the outlet is
higher than the dew point of the flue gas from the boiler (dry operation). The flue
and the smoke ducts must be fitted with drains or inspection holes with sealed
doors and in case of wet flue gas also with a condensate drain valve.
Guidelines:
• in the lower range of Compact Bio power, the flue gas temperature may
fall below 100°C, the boilers must be connected to moisture resistant flues
(acid proof liners - steel sheet, vitrified clay recommended); if the boiler is
not connected to the moisture resistant flue, perform required calculations
or use the existing flue data;
• the connection between the boiler's flue connector and the flue must be
insulated and as short as possible, slightly upwards without sharp bends
and a minimum number of bends.
• the smallest diameter or cross section of a natural draught flue and a smoke
duct must be min. 0.14 m, whereas the smallest diameter must be min.
0.12 m if the steel liners are used;
• horizontal flue duct length must not exceed the effective flue height or 7
metres.
Compact Bio / Compact Bio Luxury User Manual – EN 07.15