Commissioning
Condens 7000 FP – 6721846699 (2022/12)
30
For higher supply pressures than shown in table 10, Bosch offers
additional gas pressure regulators as accessories.
7.10 Check and adjust the gas/air ratio
The deviation between the measures CO
2
value in full load and partial
load must not be greater than 0.5% CO
2
.
Check the CO
2
setting for full and partial burner loads.
Make corrections if required.
Take the O
2
content corresponding to the specified CO
2
setting
values (natural gas DK CO
2
rat.=12.0 Vol. – %) of the flue gas (
Chapter 17.5, page 71).
7.10.1 Carry out a CO
2
adjustment at full load ?(to at least 70%)
Always carry out an adjustment at full load first and then at low load.
During the flue gas test, ensure that enough heat is being drawn off.
Read off the load at the control unit (technical documentation of
the control unit).
Wait until at least 70% load has been reached.
Insert the test sensor through the measurement port ( Fig. 38,
page 31) in the flue gas collector into the core stream and check the
CO
2
value.
In the case of CO
2
values below 8.7% or above , 9.2% correct 9.7%
the setting on the high full load screw to ( Fig. 36).
– Turning the screw clockwise reduces the CO
2
level.
– Turning anticlockwise increases the CO
2
level.
Enter the values in the commissioning report (Chapter 17.6,
page 72).
When operating with gaseous fuels with a hydrogen content of up to
20 % by volume, the CO
2
values may deviate from the data specified. You
can obtain detailed information on the gas mixture supplied and its
effect on the performance and CO
2
content from your responsible gas
supply company and our service department on request.
Only for type C93:
If the supply air infeed is designed as an annular gap around the flue,
check the CO
2
value in the combustion air at the on-site
measurement port.
Values above 0 % indicate faults or leaks in the flue gas routing.
Identify and eliminate the fault.
Fig. 36 Carry out a CO
2
adjustment at full load
7.10.2 Carry out an adjustment and check of the CO
2
level at low
load
Adjust the flue gas test function via the control unit (technical
documentation of control unit)
Read off load at control unit.
Wait until the smallest output has been reached.
Insert the test sensor through the measurement port ( Fig. 38,
page 31) in the flue pipe into the core stream and check the CO
2
value.
In the case of CO
2
values below 8.7% or above 9.7%, correct the
setting on the low load adjusting screw [1] to 9.2%.
– Turning the screw clockwise reduces the CO
2
level.
– Turning anticlockwise increases the CO
2
level.
Check the CO
2
value again and enter in the commissioning report
( Chapter 17.6, page 72)
When operating with gaseous fuels with a hydrogen content of up to
20 % by volume, the CO
2
values may deviate from the data specified. You
can obtain detailed information on the gas mixture supplied and its
effect on the performance and CO
2
content from your responsible gas
supply company and our service department on request.
0010042284-001
1
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