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Note: avoid burning fine fuels, in which dusts concentration exceeds 5%.
Pay attention when burning very dry sawdust (moisture content up to 15%),
do not compact them tightly in the combustion chamber. Having charged
sawdust, leave free space in the rear part of the chamber to ensure air
access. Failure to meet these requirements may result with gases from
combustion chamber backdrafting during sudden opening of the charging
flap. (When the charging flap is opened, this may cause sudden growth of
the air volume in the combustion chamber and explosive combustion of
dusts.). When operating a boiler with air supply system, do not open the
charging flap while the fan is operating. Before supplementing the fuel,
switch off the controller.
Adjustment of the boiler performance, and thus the supply water
temperature shall be performed by changing operational parameters preset on
the controller. In exceptional situations (e.g. in case of power supply outage),
this can be performed by adjusting the throttle (or the ash pan doors adjustment
slot) or by changing the cross-section of the combustion gases outlet in the
smoke breeching. When operating a boiler with air supply system, the ash pan
flap shall remain closed and it is recommended not to use the throttle. However
remember not to block the throttle, as it may act as a safety valve in case of an
uncontrolled combustion of gases.
If after the blower is started, the throttle flap slightly raises (due to too
high draught) it must be pressed down so that it lies flush with the frame
The boiler has factory preset hinges. If during boiler starting combustion
gases backdraft to the boiler room, then hinges must be pressed down and at the
same time the charging flap handle must be adjusted.
! Always make sure that back drafting is not caused by closed flue damper
or use of elbows or connectors making flue gases difficult to leave the boiler.
3.4. Boiler and Chimney Cleaning
Grate cleaning is performed when water temperature starts to drop and
when the ash pan illumination reduces. Ash shall be removed while the flame is
reduced.
In order to ensure fuel economy, keep internal chambers of the boiler and
spaces between water tubes clean. An indication suggesting that cleaning is
required is reduced chimney draught. Insufficient air will cause the boiler to
smoke excessively.
There are washouts installed on side walls of the flue damper. Their
purpose is provide access to boiler interior for cleaning. Due to high temperature
