45
7.8
Setting gas/air regulation
The CO
2
setting has been set at the factory and does not require any adjustments, in
principle. The setting can be checked by measuring the CO
2
percentage in the combustion
gases. In case of any disturbance of the setting, the replacement of the gas valve or the
conversion to a different type of gas must be checked, and if necessary set in accordance
with the following instructions. Always check the CO
2
percentage when the lid is open.
Checking the carbon dioxide setting
1
Switch off the heat pump module with the user interface.
2
Switch off the gas boiler with the button.
-
appears on the service display.
3
Remove the front panel from the gas boiler.
4
Remove the cover from the sample point (X) and enter an appropriate chimney analysis
probe.
IMPORTANT
Ensure the start-up procedure of the analysis machine has
been completed before inserting the probe in the sample point.
IMPORTANT
Wait for the gas boiler to run stable. Faulty measurements
may occur if the measuring probe is connected before the
boiler is running stable.
5
Switch on the gas boiler with the button and create a request for space heating.
6
Select the High setting by twice pressing the
and buttons simultaneously. A
capital letter "H" will appear on the service display. The user display will show a Busy
symbol. Do NOT carry out a test when a small letter "h" is shown. If this is the case,
press
and again.
7
Allow the display values to stabilize. Wait at least 3 minutes and compare the CO
2
percentage to the values in the following table.
CO
2
value at
maximum power
Natural gas G20
(20 mbar)
Propane G31
(30/37/50 mbar)
Maximum value
9.6
10.8
Minimum value
8.4
9.8
8
Note the CO
2
percentage at maximum power. This is important in relation to the
following steps.
IMPORTANT
It is NOT possible to adjust the CO
2
percentage when the test program
is being carried out. If the CO
2
percentage deviates from the values in
the above table, contact your local service department.
9
Select the High setting by once pressing the
and buttons simultaneously. "L"
appears on the service display. The user display will show a Busy symbol.
10
Allow the display values to stabilize. Wait at least 3 minutes and compare the CO
2
percentage to the values in the following table.
CO
2
value at
minimum power
Natural gas G20
(20 mbar)
Propane G31
(30/37/50 mbar)
Maximum value
(a)
Minimum value
8.4
9.4
(a)
CO
2
value at maximum power registered at setting High.
