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Figure 5.9. View of the primary air control flap and the air distribution box;
EXPLANATION : the moving flap is installed in order to allow visual
inspection of the primary air control flap. At nominal operating conditions this
flap should close the orifice;
•
Adjustment of the combustion process
The adjustment of the operating parameters, which define the thermal
capacity of the hot water boiler, should be performed by authorized, trained
and certified technician in order to achieve efficient combustion process
and optimal performance of the unit. It is recommended to make the
adjustment of the combustion process by measurements with flue gas-
analyzer.
o
The primary air flow rate, which is adjusted with the position of the
primary air control flap, is required in order to sustain the pyrolisis
process, organized in the fuel hopper chamber of the boiler. By
changing the position of this flap, it is possible to control the volatile
gases release rate, i.e. the thermal capacity of the boiler – this is
possible in narrow range of the operating mode of the boiler. As a rule
of a thumb, at higher moisture content of the fuel, the position of the
primary air control flap should be opened (by pulling the axes of the
flap out of the boiler) and fixed again with the screw. ATTENTION:
Moving flap, which closes the
monitoring orifice for manual
observation of the primary air
control flap position
Primary air control flap
Direction for opening of the
primary air control flap (i.e.
increasing the primary air
flow rate)
Direction for closing of the primary air control flap (i.e. decreasing
the primary air flow rate)
