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7
Heat cell with gas burner
The factory-set starting output usually provides a problem-free, quiet
burner start.
The starting output of the burner blower is set at the factory.
If an obvious deflagration or whistling sound occurs during the start-
ing process, or several starting attempts are necessary on a regular
basis, a slight change in the starting output may help.
▪ For deflagrations: Reduce the starting output or gas volume.
▪ In the event of difficulties starting such as burner whistling or
flame formation: Increase the starting output or gas volume.
We recommend the following procedure for rectifying general start-
ing problems:
Calibration of the combustion control
CAUTION
The combustion control is programmed to take ageing of
the components into account. 100 % calibration of the
combustion control can still have a negative impact on this
despite compliance with the flue gas setting values
(Tab. 5-1
to
Tab.
5-4).
▪ Only calibrate the combustion control when the flue gas
setting values are not adhered to or when a mechanical
change has been made, e.g. by replacing the compon-
ent with original spare parts.
1
Switch the GCU compact off and then on again.
2
Rotary switch in "Configuration" position
è An overview is displayed.
3
Use the rotary switch to select the "Lambda-Gx" level.
è An overview is displayed.
4
Use the rotary switch to select the [100% Calibration] parameter
and confirm.
è An overview is displayed.
5
Use the rotary switch to select the [Drop Io-base] parameter and
confirm.
è Calibration running. After calibration is complete, an adjust-
ment range of -5 to +10 is displayed.
6
Connect the flue gas analysis device to the test adapter for the
flue gas pipe.
7
Use the rotary switch to adjust the [Drop Io-base] parameter so
that the flue gas values lie in the target value range.
8
Confirm the changes with a brief push of the rotary switch.
è Calibration is finished.
è Burner starts without problems: No further measures are re-
quired.
è Burner start still has faults: Check the starting output of the
burners and adjust as necessary.
Checking, adjusting the burner starting output
The setting of the [Corr power start] parameter is directly associated
with the structural design.
1
Rotary switch in "Configuration" position
è An overview is displayed.
2
Use the rotary switch to select the "Lambda-Gx" level.
è An overview is displayed.
3
Use the rotary switch to select the [Corr power start] parameter
and confirm.
è Current value is displayed.
4
Use the rotary switch to adjust the [Corr power start] parameter.
5
Confirm the changes with a brief push of the rotary switch.
6
Switch the GCU compact off and then on again.
Installation and operating instructions
48
7
Adjusting the gas volume at the burner start
The gas volume at burner start can be set up by adjusting the para-
meter [Corr qGas start].
1
2
3
4
5
6
7
.
For starting problems after a replacement of the safety gas con-
trol block:
The starting configuration of the safety gas control block can be ad-
justed for the first burner start by setting the [CL - Offset CES] para-
meter.
1
2
3
4
5
6
7
If there are noise problems (such as whistling, humming), adjusting
the starting parameters described above (starting output, gas
volume burner start) may help.
Disruptive noise caused by resonance can also be reduced effect-
ively using a silencer
7.3.5
Generate a burner demand (e.g. heating operation).
è Burner starts without problems: Recheck the flue gas values
in accordance with
Chap.
7.3.3. No further measures are re-
quired if the flue gas values lie within permissible limits.
Enter the performance change in the operating manual and
confirm with your signature.
è Burner start still has faults: Readjust the starting output and
adjust the gas volume as necessary.
Rotary switch in "Configuration" position
è An overview is displayed.
Use the rotary switch to select the "Lambda-Gx" level.
è An overview is displayed.
Use the rotary switch to select the [Corr qGas start] parameter
and confirm.
è Current value is displayed.
Use the rotary switch to adjust the [Corr qGas start] parameter.
Confirm the changes with a brief push of the rotary switch.
Switch the GCU compact off and then on again.
Generate a burner demand (e.g. heating operation).
è Burner starts without problems: Recheck the flue gas values
in accordance with
Chap.
7.3.3. No further measures are re-
quired if the flue gas values lie within permissible limits.
è The burner start still has faults: See
Rotary switch in "Configuration" position
è An overview is displayed.
Use the rotary switch to select the "Lambda-Gx" level.
è An overview is displayed.
Use the rotary switch to select the [CL - Offset CES] parameter
and confirm.
è Current value is displayed.
Use the rotary switch to adjust the [CL - Offset CES] parameter.
Confirm the changes with a brief push of the rotary switch.
Switch the GCU compact off and then on again.
Generate a burner demand (e.g. heating operation).
è Burner starts without problems: Recheck the flue gas values
in accordance with
Chap.
7.3.3. No further measures are re-
quired if the flue gas values lie within permissible limits.
è Burner start still has faults after multiple corrections: See
Chap.
10.
(see Chap.
4.2).
Setting ignition and ionisation electrodes
CAUTION
Ignition electrodes can break with cold deformation.
▪ Dismantle the burner before adjusting the electrodes
and make the electrodes glow by using a solder lamp.
Floor-standing gas condensing boiler with integrated heat storage
Chap.
10.
Gas Combi Unit
008.1543899_02 – 04/2019 – EN
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