Wood-pellet burner
Nani 35
4.
Boiler
It is important to check that the combustion chamber in the boiler is big enough to ensure
that the flame does not come in contact with the water-cooled walls. Verify that the boiler’s
capacity range complies with the burner. There must be enough space for the ash to
accumulate. The exhaust gas channels should not be so narrow that they can easily be
clogged with ash.
The distance between the front edge of the burner and the rear part of the combustion
chamber should be at least 300mm for low burner's power (10-20kW) If the burner's power
increase then the distance must be increased. This distance is also depended on the boilers
construction and if the boiler is (oil/gas boiler or wood boiler)
The minimum distance to the bottom of the fireplace also depends on the boiler design.
There must be enough space for the quantity of ash build up that is created during at least
one week’s use in the winter heating season.
5.
Chimney
We recommend that you have a local chimney sweeper or other corresponding authority
make an inspection and provide advice and instructions on the chimney measurements in
accordance with local codes and regulations.
The chimney should then of a length and diameter that gives a draught of
10 - 25 Pa
.
Measures have to be taken if the chimney is smaller or much larger in diameter in order to
give the proper draught and flow.
If there is not enough draught in the chimney, exhaust gases stack in boiler's combustion
camber or in the chimney with the risk of explosion. Also, gas flow into the boiler's room
can happened.
Always check the exhaust gas temperature. Directly after the boiler it should be
from 160° C to 250° C.
Too high a temperature can damage the chimney and is not economical.
Too low a temperature, a very high chimney, or a large chimney diameter creates a risk for
condensation that can cause corrosion and damage due to freezing.
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