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32. Testing the combustion parameters
The condensing boiler is equipped with electronic combustion control which ensures optimum combustion quality. For a detailed
description of combustion control, see chapter "Combustion air control".
During commissioning and maintenance, only a check of the CO, CO
2
and O
2
is required. Test the combustion parameters with
the boiler closed.
A flue gas test by a contractor is necessary after every modification of the GBC-e PCB, mixing device, burner or gas
valve.
Please
note
Testing the intake air
1. Remove screw A from the left hand test port.
2. Open the gas ball valve.
3. Insert the test probe.
4. Switch ON the condensing boiler and select Emissions
test via the function keys.
5. Check the temperature and CO
2
.
6. In the case of a concentric balanced flue, the flue is not
gas-tight if the CO
2
content is > 0.3 %. The leak must be
rectified.
7. After the test has been completed, switch the appliance
off, remove the test probe and close the test port. Ensure
the screws are tightly secured.
Note:
The combustion control carries out an automatic
calibration after every boiler start. This can lead
to briefly increased CO emissions. Therefore, test
the emissions no sooner than 60 seconds after
the burner has started.
Testing the flue gas parameters while the appli
-
ance is closed
When the test port is open, flue gas can escape
into the installation room. There is a risk of as-
phyxiation.
1. Remove screw
B
from the right hand test port.
2. Open the gas ball valve.
3. Insert the test probe.
4. Switch ON the condensing boiler and select Emissions
test via the function keys.
5. Carry out testing after a minimum of 60 seconds of
operation, measuring first at maximum load and then at
minimum load.
6. Flue gas values (for permissible values, see table)
14/20/24 kW appliance
Gas type
CO
2
in %
O
2
in %
Lambda
Natural gas E/H/
LL
7.8 - 9.8
1)
3.5 - 7.0
1.35
+/- 0.15
LPG (G31)
9.1 - 11.4
2)
1)
Max. base CO
2
value = 11.7 % (G20)
2)
Max. base CO
2
value = 13.7 % (G31)
7. After the test has been completed, switch the appliance
off, remove the test probe and close the test port. Ensure
the screws and gasket are tight and firmly seated.
Please
note
Fig.: Testing the flue gas parameters
A
B
