7
Start up the heating system
Logano plus GB402 – 6 720 820 700 (2018/01)
28
7.10
Checking and adjusting the gas:air ratio
▶ Check CO2 settings for full and partial burner loads.
▶ Make corrections if required.
Applies for
Denmark
:
The burner setting in Denmark is made via the O
2
content of the flue gas.
▶ Take the O
2
content corresponding to the specified CO
2
setting
values (natural gas DK CO
2
rat.=12.0 Vol. – %) from Chapter 12.5,
7.10.1 Adjusting CO
2
at full load (70-80 %)
▶ Read off load at the RC 35 or via the service key.
▶ Wait until 70-80 % of the load is reached.
▶ Insert the test sensor through the test port (
the flue into the core flow and check the CO
2
content.
▶ In the case of CO
2
values below 8,5 % or above 9,6 %, correct the
setting on the high load adjusting screw to 9,1 % (
– Turning clockwise will reduce the CO
2
level.
– Turning anticlockwise increases CO
2
.
Only for design type C63:
▶ If the supply air infeed is designed as an annular gap around the flue
pipe, check the CO
2
content in the combustion air at the
measurement port on site.
Values above 0 % indicate faults or leaks in the flue gas routing.
▶ Identify and eliminate the cause.
Fig. 32 Checking the CO
2
setting at full load
[1]
Full load adjusting screw
7.10.2 Setting and checking the CO
2
values under partial load
▶ Press
until the decimal point in the status display
illuminates
(at least 2 seconds).
This turns on the flue gas test.
▶ Press
and
simultaneously and hold for approx.
5 seconds.
Fig. 33 Calling up partial load on the BC10
With standard settings, the display shows "
".
▶ Press the
button to reduce the boiler output to a percentage of
maximum until the display shows "L20".
▶ Read off load at the RC35 or via the service key.
▶ Wait until 20 % of the load is reached.
Country
Gas group
(reference gas)
Connection pressure
1)
[mbar]
1) The gas supplier must ensure that the pressure conforms to country-specific or
local regulations. The conditions mentioned above must also be observed. If the
gas supply pressure is outside the specified range, commissioning is prohibited.
Min
Rated
Max.
AT, BY, CH, CZ,
DK, EE, ES, GB,
HR, IE, LT, LV,
PT, RO, RS, RU,
SI, SK, TR, UA
Natural gas H (G20)
17
20
25
HU
Natural gas H (G20)
18
25
33
EN
2)
, LU, PL
2) Natural gas group "H according to DVGW Code of Practice G 260" falls within
natural gas group "E according to BS EN 437". Natural gas group "L according to
DVGW Code of Practice G 260" falls within natural gas group "LL according to
BS EN 437".
Natural gas E (G20)
17
20
25
FR, BE
Natural gas Es Natural
gas E (G20)
17
20
25
FR, BE
Subarea Ei natural gas
E (G25)
20
25
30
NL
Natural gas L (G25)
20
25
30
DE
2)
Natural gas LL (G25)
18
20
25
PL
Natural gas Lw
(G27)
3)4)
3) 320 kW variant not suitable for this gas group.
4) previously GZ41.5
16
20
23
HU
Natural gas S
(G25.1)
3)
18
25
33
Table 12 Gas groups and connection pressures according to EN 437
The specified supply pressure must be ensured across
the boiler's entire modulation range. If necessary, an
additional pressure regulator must be provided.
In the case of multi-boiler or multi-consumer systems,
the supply pressure range for single boilers must be
ensured in each operating status of the multi-boiler or
multi-consumer system. If necessary, supply each boiler
or consumer via a separate pressure regulator.
For higher supply pressures than shown in table 12,
Buderus offers additional gas pressure regulators as
accessories.
NOTICE:
Material damage if there is burner operation
with too high a CO
2
content!
Permanent operation with excessive CO
2
content can
cause damage to the burner rod and burner.
▶ Observe the CO
2
contents for full load and partial
load, which are given in the technical
documentation.
Summary of Contents for GB402-320-5
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