ROTEX Heating Systems GmbH
43
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.
We recommend you wait for at least 30 minutes.
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
Natural gas G25 Propane G31
(30/50 mbar)
Propane G31
(37 mbar)
Maximum value
9.6
8.3
10.8
Minimum value
8.4
7.3
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
Natural gas G25 Propane G31
(30/50 mbar)
Propane G31
(37 mbar)
Maximum value
(a)
Minimum value
8.4
7.4
9.4
9.4
(a)
CO
2
value at maximum power registered at setting High.
