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- After its kindling, the firebox is refueled with more fuel. After achieving the necessary power, it
is good the valve of the flue gases to be closed, so that the eventual loss of heat through the chimney is
avoided.
- The boiler is refueled according to the needs of heat and the intensity of burning, always when a
necessary amount of embers is available.
Adjusting elements
The valve for the flue gases on the chimney adjusts the quantity of the flue gases getting out from
the boiler to the chimney. It is adjusted by the handle, located on the upper part of the boiler on the
connecting pipe of the chimney pipes. When operation with pellets the valve must be entirely open.
The adjusting of the primary air is done by a thermostat depending on the temperature of the water
in the boiler. The adjusting process is carried out by the adjusting button with a marked scale 0-9. The
markings on the button are only informative. The adjusting is done in the following way. The boiler is
warmed up till the desired temperature. By means of the button the valve for the primary air of the
thermostat is closed. On falling in temperature the valve of the primary air begins to open by itself.
When operating with pellets, the valves for primary air are entirely closed.
Condensation and tarring
On initial introducing of the cold boiler in operation, water condenses on its walls, which trickles
in the firebox and creates impression that the boiler is leaking. The condensation disappears after
sticking ash inside of the boiler. On operation with decreased power, at a low temperature of the water
in the boiler, usually under 60°C and on using humid fuel water condenses from the flue gases, which
starts running on the cooled walls of the boiler. The low temperature operation affects adversely also
on the life of the water heat exchanger and the flue (smoke) pipes.
Chimney
The chimney is intended to draw the combustion products out of the fireplace and to throw them
away in the atmosphere outside the limits of the abode.
The upward draught or the "pulling" of the chimney is a result of the combination between its
height and the difference in the temperatures of the flue gases and the air outside. The column of hot
flue gases in the chimney has smaller weight than the equivalent column cold air outside, so that the
pressure in the lower end in the warm chimney is smaller than the atmospheric (air) pressure outside.
This quite small difference in the pressures creates the draught.
The lower draught is a prerequisite for difficult kindling or returning of flue gases, and it is
overcome through quick kindling and burning of dry, thin and fast-burning sticks and twigs. After
kindling of the fire and warming up of the chimney, its draught increases. For economical regime and
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