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8.6 Boiler cleaning and maintenance
The boiler should be cleaned at a greater frequency as tar and ash deteriorate heat transfer, which reduces boiler efficiency.
The ash from the chute shall be swept away through the opening in the nozzle into the combustion chamber. Tar components
must be removed from the boiler walls by a scraper and also swept into the combustion chamber.
Make sure the tar does not flow or impurities falling to the air flap. If so, release the flap and scrape the tar. The air flap must be
easy to open and close.
Notice:
The primary air flap is an important boiler control element. Therefore, it must be regularly checked and the air duct space must be
kept clean! The fallen lumps of wood prevent opening the flap and thus make it impossible to achieve the required boiler power.
At the same time, the tar on the walls of the air duct hinders reliable closure of the air flap thereby bringing about uncontrolled
combustion that may cause boiler overheating!
Sweep away the ash from the combustion chamber. If possible do not remove the A-shaped adapting piece. In the event that
the shaped piece must be removed with a view to allowing a more thorough cleaning of the boiler, or due to the need for
the replacement of the shaped piece, while fitting the shaped piece back into the combustion chamber, it must be moved all the
way to the back wall of the chamber.
Notice:
If the shaped piece does not perfectly abut to the back wall of the combustion chamber, the hot flue gases pass through
from the combustion nozzle directly to the flue gas exchanger, outside of the post-combustion chamber. This deteriorates
the combustion process (the quantity of the flue gases does not correspond to the guaranteed values) and the power and
efficiency of the boiler drop!
Unscrew and remove the upper cleaning lid and clean the exchanger space using a steel brush supplied as part of the boiler
accessories. Use a scraper to clean the entire flue duct including the chimney flap.
Check the tightness of the chimney flap. Where necessary adjust the flap position in such a way so that it may abut evenly
to the vent from the boiler chute.
Check or remove the gaskets of the cleaning lids and screw them back on.
Check the gaskets of the filling and ash pan doors and where necessary replace them. Check the tightness of the doors
at closure. If either door is not tight, adjust. Treat the hinges and caps regularly with graphite grease.
Perform a visual check of all mechanic parts of the boiler including the ceramic shaped pieces and where necessary, replace
them. We recommend trusting the replacement of any damaged parts of the boiler including the combustion nozzle
to a professional service company.
The condition of the heating system must be checked at least once a week (tightness, quantity of water, condition of circulation
pumps, and or the eventuality of system freezing).
Notice:
In the course of the cleaning procedure, the ceramic shaped piece must be handled with care. Careless treatment and/or
a fall from a height will cause damage and will require a replacement.
8.7 Overview of possible defects
Description of malfunction
Probably cause
Removal method
Fuel material with humidity above 15 %
Use firewood at maximum humidity
of 15 %
Large and short lumps of wood (average
above 150mm and length shorter by over
200mm compared to the chute depth).
Use wood lumps of correct dimensions
Primary air flap off.
Clean and release the flap.
Flap not fully closed.
Check the flap tightness, clean the flap,
check the condition of the return spring
and position of the flap draw bar. Replace
if necessary.
Nozzle clogged.
Clean and remove any articles fallen
through to the nozzle slot, or into the
suction holes.
The boiler burns poorly, exhibiting a
low power; the flame in the
combustion chamber is dull and
yellowish.
Excessive firewood consumption.
Nozzle damage.
Replace the nozzle.
We recommend trusting the job to a
specialised service company!
