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Solid fuel boilers 921 series
3.3. Heating
The automatic thermostat control should be set to the
water temperature required i.e. if 60°C is required the
white figure 60 should be set opposite the white line on the
thermostat body. Provided that the fire is stocked up and
the ash pan door draught flap is closed the thermostat will
automatically control the burning rate fo the fire and produ-
ce the required temperature.
3.4. Fuel
Coal
: Use of household coal, and coals which disintegrate
in heat are not recommanded nor are those producing a
large amount of ash. Smokeless fuel, Anthracite or similar
Smokeless fuels give the most efficient performance
Wood
: Use only well seasoned dry wood (at least two year
old and dried under cover for at least six months before
using). Serious damage to the boiler can occur by using
unseasoned wood.
Peat
: This fuel, like wood, must be properly dried. If the
fuel is wet, the output will be considerably decreased and
appliance could suffer from corrosion.
Remarks about the use of fuels
The amount of ash in the fire is a very important factor in
the performance of the Franco Belge.
When burning wood, a good base of ashes is advanta-
geous for slow controlled burning, but should be reduced
by riddling before cooking, or whenever ash accumulates
too much and reduce the fire box capacity.
When burning coal or smokeless fuels, the ash must be
riddled more frequently to allow a good airflow to the fire.
Solid fuel requires much more air to burn than wood.
3.5. Flue draught control box
For Great Britain only (ill.3, page 21) :
The draught control box is designed to slow down the flow
of gases leaving the appliance and entering the flue.
This is accomplished by restricting the square area of the
chimney. It causes the gases created in the appliance to
move slower and in so doing reduces the amount of com-
bustion air entering the unit. The result is that the ap-
pliance will burn for longer periods.
The flue box has two controls : the spinner air wheel
the damper control 2.
If it is found that the appliance is burning too fast, close the
flue damper
2
to one of the four positions. Trial and error
will determine which setting is best for your situation.
When experimenting, start by putting the lever in the top
position and close it notch by notch, as necessary.
Always remember to open the damper to a vertical position
before attempting to reload with fuel.
The air wheel
1
situated at the front of the flue box should
only be used if the damper gives insufficient control. If this
is the case, the air wheel may be opened little by little until
the desired result is obtained. The air wheel must not be
used for long periods and should be closed before refuel-
ling.
3.6. Summer grates (optional)
During the summer when the domestic hot water supply
but not the central heating, is required, the appliance
should be used with the "Summer Grate". This grate rests
24
:
1
and
Document n° 343-4EN ~ 10/11/1998
on four lugs situated in the fire box and reduces the size of
fire by approximately half.
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Figure 9 - Operating devices
1 - Thermostat.
2 - Loading door : "Coal".
3 - Loading door : "Wood".
4 - To open the loading door.
5 - Secondary air control.
6 - To riddle the grates
7 - To open the ash pan door.
8 - Manual draught control
9 - Poker
10 - Scraper for cleaning and scraping fire box and flue
passages.
11 - Riddling handle for deashing and for opening ash
pan door.
12 - Opening tool, for handling ash pan, lifting plate
above fire box to load.
Grillon - Buchère
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Technical manual
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