19
INSTALLATION AND OPERATION MANUAL
volume of the fire bed expands several times. This situation can occur if very dry and thinly cut wood gets loaded into the
fuel chamber. Consequently, the volume of the fire bed increases rapidly during the burning process and soon a lack of air
occurs, allowing the combustible gases to escape unburned through the chimney into the atmosphere. An indicator of this
undesirable course is dense fumes emerging from the chimney.
The best way to stoke a boiler is the so-called two stages method. During the first stage, the boiler is stoked with a small
amount of fuel. The aim of this phase is to warm up the boiler and form the optimal fire bed. The second stage is intended for
full fuel loading and to perform the main combustion.
The first stage: Prepare thin-cut wood and paper for an easy start. The volume of loaded fuel should be about 15-20 %
of the fuel chamber’s capacity. Open the upper flue damper 3 (Fig.1) and both boiler doors, put the wood and paper inside.
Kindle the paper, make sure that the firing starts and close the upper door. After the temperature of water in the boiler
reaches 45°C, close the damper and the lower door and turn on the ventilator. Let the boiler burn further for 30 minutes.
The second stage: Load the boiler fully. If wood briquettes are used for stoking, load approx. 70 % of the fuel chamber’s capacity.
Before opening the door, simultaneously press the “+” and “-”controller knobs, shown in Fig. 11. The letter “L” will appear on the
display and the ventilator will stop. Open the damper 3 (Fig. 1) by pulling the handle towards yourself, and after some time, open
the upper boiler door very slowly to avoid smoke escaping into the room. Load the fuel, close the door and push the handle of the
damper 3 (Fig. 1). Press the knob “P” on the controller panel. The ventilator will start and the boiler will continue its firing mode.
If you lack time to stoke the boiler in the two stages mode as described above, then stoke it by one stage. The boiler will operate
as usual. But if there is the possibility to do so, use the two stages mode in order to achieve an even more effective combustion.
• ReGUlaTIon of THe boIleR TeMPeRaTURe
See the technical description of the electronic regulator KR-4.3D.
• aDDITIon of fUel
It is important to stop the ongoing program of a controller when adding fuel into an operating boiler
(see the recommendations below)!
When the boiler is still active, the controller lamp 3 “Firing on” (Fig. 11) light is on. To add more firewood, perform the
following procedure:
1. Press the controller knobs "+" and "-" simultaneously. The symbol "L" will appear on the display, indicating the program
has been paused. The ventilator will automatically stop.
2. After the firewood has been added, resume the controller program operation by pressing "P" knob. The symbol "L"
must disappear from the display. The ventilator will automatically turn on and continue its operation from the point of
interruption.
While adding firewood into the combustion chamber after a fuel load has burned off, perform a usual procedure:
1. Open the damper of the upper flue 19 by pulling the handle 3 towards yourself (Fig. 1).
2. Switch off the ventilator switch 3 (Fig. 9).
3. Wait at least 20 seconds, allowing the smoke to be removed by draught; then slowly open the upper door.
4. Put the firewood in and close the door tightly.
5. Switch on the ventilator.
6. Close the damper of the upper flue.
If operated following this order, smoke and carbon monoxide will not enter the room. Water temperature and pressure in
the system are checked by readings of the thermometer-manometer, installed in the heating system.
