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31. Checking the combustion parameters
A
B
Fig.: Testing intake air and flue gas parameters
The condensing boiler is equipped with electronic combustion control which ensures optimum combustion quality.
During commissioning and maintenance, only a check of CO, CO
2
or O
2
is required.
Test the combustion parameters with the boiler closed.
A flue gas emissions test by a contractor is necessary after every modification of the GBC-e PCB, mixing device,
burner and gas valve.
Please
note
Checking 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 boiler and select Emissions test via the
function keys.
5. Check the temperature and CO
2
.
6. In the case of a 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 boiler OFF,
remove the test probe and close the test port. Ensure
the screws are tightly secured.
Checking the flue gas parameters
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 boiler and select Emissions test via the
function keys.
5. Carry out the checks 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).
14/20/24kW-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 boiler OFF,
remove the test probe and close the test port. Ensure
the screws and gasket are tight and firmly seated.
Please
note
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.
Summary of Contents for CGB-2 Series
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