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TECNIKA 28-35
USE AND INSTALLATION MANUAL
Chapter
6
page 40
Start-up procedures
Technical dept. - All rights reserved - Reproduction prohibited
6.8.
Adjusting boiler operating parameters
The combustion process must be adjusted at the nominal operating conditions for optimal, efficient fuel use.
You are keenly recommended to adjust the combustion process by measuring combustion gases using a gas
analyser. The adjustment must be carried out by a specialised technician.
The combustion process is adjusted by adjusting the air flow and distribution. The air consumed during the
combustion process is aspirated into the fuel hopper chamber by the burner nozzle by means of the
combustion gas fan. Air is distributed by the air box, where it is pre-heated and conveyed towards the fuel
hopper chamber ("primary air") and towards the burner nozzle ("secondary air"). Air distribution is adjusted
by the position of the primary air control fin (positioned over the air inlet). The primary air aspirated into the
fuel hopper chamber is used to feed the wood gasification process (called "pyrolisis"). The secondary air is
used to oxidise volatile gases which pass through the burner nozzle. These gases are mixed with pre-heated
secondary air, mixed and oxidised in the combustion chamber of the boiler. This process allows effective fuel
use with low running costs of the heating system. The process could be explained as gas combustion
because most of the fuel is gasified and burnt in the oxidisation chamber of the boiler. The structure of the
boiler allows optimal combustion process conditions and high heat efficiency in addition to simple heat
output and boiler operating mode control. Adjusting the position of the primary air flow control fin requires
knowledge of the boiler operating function, of the combustion process and of the fuel properties in addition
to the services of a technician in order to obtain optimal results. Practical experience demonstrates that
varying the position of the primary air control fin affects operating conditions of the boiler with a delay of
approximately 15-30 minutes. Consequently, in this case wait for at least 15 minutes (preferably 30 minutes)
to obtain constant operating mode of the boiler for the fin position to have a significant effect on the
combustion process.
Air is appropriately distributed by the primary air control fin and by adjusting the fin itself, by means
of the chain, hooked to the thermostatic valve lever. The following figures show details related to air control
adjustment.
NOTE: an inspection opening is provided for checking the position of the primary air control fin.
