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Correct quantity of wood
7
Correct quantity of wood
When not much heating is needed only place a
small amount of wood in the boiler
Absorbing all the heat from a boiler fully loaded with
wood would require buffer storage tanks larger than
needed for winter operation and also larger than those
normally installed.
When less heat is required, i.e. for hot water in the
summer, or during the evening shortly before the night
set-back, only load the boiler with the amount of wood
actually needed.
The table below displays the amount of wood needed
for summer operation for different boiler sizes (= fuel
chamber capacity), wood type, buffer volume and
buffer charging status. Bear in mind that a "buffer top"
temperature sensor that is installed too low reduces
the usable volume.
If the living space already needs some heating, start
with the amount of wood indicated in the table below.
To establish the correct amount, approach the fully
charged buffer state slowly, adding one or two more
logs every heating cycle. If too much wood is loaded,
an emergency shutdown of the boiler will occur. If the
boiler overheats, the flow of air is stopped. The fire will
go out, but the hot wood will continue to smoulder for a
while and the unburned wood gas resulting from the
lack of air can create tar deposits in the boiler and flue.
If this occurs often, the boiler's heat exchanger will
become clogged with tar.
Observe the energy density of the fuel. The
energy content of 50 litres of wood briquettes
corresponds to 100 litres of beech wood or 150 litres of
spruce.
The current buffer charging status is displayed in
the control system in the boiler and buffer
overviews. It is shown in percent and is the average of
the three buffer temperatures (top, middle, bottom)
between 30°C (=0%) and 80°C (=100%).
SH20 / SH30
Buffer charging status
SH40 / SH50 / SH60
Maximum fuel load
Size of buffer storage tank (litres)
Maximum fuel load
Briquette
s
Beech
Spruce
3300
2200
1650
1100
Briquette
s
Beech
Spruce
90%
85%
80%
70%
85%
78%
70%
55%
1/4
80%
70%
60%
40%
1/4
75%
63%
50%
25%
1/4
70%
55%
40%
10%
1/2
65%
48%
30%
0%
60%
40%
20%
1/8
1/4
55%
33%
10%
1/4
1/2
3/4
50%
25%
0%
1/2
45%
18%
40%
10%
4/4
35%
0%
30%
3/4
25%
1/4
1/2
3/4
20%
15%
10%
5%
1/2
4/4
0%
4/4
Summary of Contents for TWIN 20 kW
Page 1: ...2016 04 02 EN 0000000302 V 001 X 36 0 2303 93412 001 TWIN pellet burner 20 26 kW Operation ...
Page 39: ...ETAtouch controller TWIN function block 39 ...
Page 49: ...ETAtouch controller Buffer function block 49 ...
Page 53: ...ETAtouch controller Hot water tank function block 53 ...
Page 57: ...ETAtouch controller Fresh water module function block 57 ...
Page 81: ......
Page 82: ...www eta co at ...
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Page 84: ...www eta co at ...
