17
TECHNICAL PASSPORT INSTALLATION AND MAINTENANCE INSTRUCTIONS
7. FIRING OF BOILER AND ADDING FUEL
7.1 FUEL IN BOILER BURNS MOST EFFICIENTLY WHEN COMBUS-
TION CHAMBER IF FULLY LOADED (fi gure 1)
“U“ boiler has switching valve (6) (fi g. 1), which, when burning coal, must be in such position
as (fi g. 12), when burning wood it should be lowered. Firewood boiler and “BIO” doesn’t have
such valve (6) (fi g. 1). Air distributor with combustion chamber stabilizer (9) (fi g. 1) must be
raised while loading the fuel, in order to do this you should take the ring on the end of a cord
(12) (fi g. 1), which is hanging above the fuel loading doors, pull it down and hang it on the hook
(13) (fi g. 1). Wood should be stacked horizontally while putting longer pieces in the middle and
shorter ones at the sides. Don’t let vertical piece of wood get in middle. It is advisable to fi ll up
remaining openings with sawdust and little wood residues.
Fire grate (19) (fi g. 1) must be used when loading
coal, briquettes, pellets. It is opened by lifting the
switching valve for coal and peat (6) (fi g. 1) and for
cleaning ash and resin. Use pieces of coal. Pieces
that are larger than half liter jar must be crushed. Don’t
mix any other fuel with coal, only add about 2 kg of
dry fi re wood chopped in small pieces. Boiler works at
50 – 70 % slower mode with fi ne coal, so you should
use fi ne coal in warmer days. When loading peat, use
large briquettes for almost whole load only put some
fi ne pieces of peat at the end. After loading fi rewood,
pellets and sawdust briquettes immediately ignite the
fi re – so that the load of fuel would not be ignited by
leftover ember.
Before igniting the boiler carefully read the instruction of draft regulator (more information p.p
7.3.), check if spike of adjustment bolt is in its recess and if bump of support rod is in the right
opening. Open the valve (1) (fi g. 1) by 3-5 cm by turning adjustment bolt.
Ignite the very top of the load; close the door a little more, (8) (fi g. 1) but leave 2-5 cm ope-
ning. Close the door (8) (fi g.1) when fuel is burning and unhook the ring with lifting cord (12) (fi g.
1) from the hook (13) (fi g. 1). Combustion liquid designed for igniting furnaces and fi replaces
can be used for igniting the fuel, but don’t use it when boiler is already burning. Air must not go
in trough bottom door dedicated for cleaning ash (11) (fi g. 1).
When boiler is burning, window or special opening in an outer wall of boiler room must be
open so that boiler could pull air from outside.
It is not allowed to keep adding fuel when using coal. When using fi rewood, pieces can be
added to boiler together with larger wood residues at the time of burning: before doing that you
must lift the air distributor with burning chamber stabilizer (9) (fi g. 1) and open the doors (8) (fi g.
1). When boiler is burning it is dangerous to instantly open the door wide (8) (fi g. 1) – fi re can
burn your face. So at fi rst, open the doors of fuel loading just 2-3 cm while looking and keeping
away from boiler and after 20-30 sec normally open the doors (8) (fi g. 1) and add fi rewood,
but not more than two layers (20-30 cm), close the door (8) (fi g. 1) lower the air distributor with
combustion chamber stabilizer (9) (fi g. 1).
After adding fuel, quality of burn and effi ciency will decrease for short time, so such addition
is recommended only to extend the time of fuel load burn till the next addition of fi rewood or
next ignition.
Figure 12
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