Kalvis 4 - Combustion Chamber Refuelling; Boiler Stoking

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6.4. Combustion chamber refuelling
It is advisable to refuel only after previous fuel load fully burns out; earlier
refuelling is allowed only in the cases of necessity when there is no other
option.
Put firewood freely into the combustion chamber, for while burning the
pieces could slump down to the bottom of the combustion chamber.
When refuelling:
• Fully open smoke draft and firing valves;
• Turn the draft regulator knob (clockwise, up to the support) to fully close
the air supply valve;
• Open the fuel loading door and wait for 15 to 20 s after opening the door
(check the open door until no smoke remains in the chamber);
• Open the door fully, if necessary, moving the lower layer of the fuel with
poker so that the ash does not clog the openings in the firegrate to allow air
to pass into the combustion chamber;
• Refuel the combustion chamber;
• Close tightly the fuel loading door and close the firing valve;
• Restore the smoke draft valve trap to its former position for the required
draft from the boiler;
• Open the air supply valve with the help of air draft controller according to
the selected temperature.
6.5. Boiler stoking
In the case of poor drafts, bad weather conditions, open the firing valve
and close it when the chimney warms up and draft improves.
Boiler performance factor drops if stoking the fuel with smoke draft valve
open.
In the case less heat is needed than the nominal power of the boiler, for
there was no smoldering (in which case resins can start accumulating in the
boiler), do not load the combustion chamber in full. It is advisable to load
one third of the combustion chamber.
If boiler is used for cooking only, move the firegrate to the top position.
Then stoking goes on through the upper fuel loading door.
In fuel combustion, ashes remain which cover the firegrate; the intensity
of combustion and the boiler's power decreases. Therefore, the fuel needs to
be poked. Burning coal is poked with poker through the gaps in the internal
cast-iron door. A large amount of accumulated ash prevents the entry of
primary air, which means that ashes need to be removed in time.
During heavy combustion, do not open fuel loading door.
Boiler stoking requires a lot of air, so sufficient amount of air has to enter
the boiler room.