53Installation and maintenance manual ecoTEC
9.7 Check CO
2
content and if necessary set (air-
ratio adjustment)
2
1
Fig. 9.7 Carrying out measurement of CO
2
levels, preparing for
air-ratio adjustment
Note
Checking/adjustment of this value is required in
the following instances: replacement of gas
valve, conversion to or from Natural Gas/LPG
or if incorrect combustion is suspected!
• Remove the front cover.
• Press the “+” and “-” keys simultaneously.
The “Full load mode” is activated.
• Wait at least 5 minutes until the appliance reaches its
operating temperature.
• Measure the CO
2
content on the flue gas measuring
nozzles (1).
• If necessary, loosen the screw and fold the suction
pipe extension forwards by 90° (don‘t remove!).
• If necessary, set the corresponding flue gas value
(value with removed appliance front, see Table 9.2) by
turning the screw (2).
-> Turn to the left: higher CO
2
content,
-> Turn to the right: lower CO
2
content,
Note
Only for natural gas:
Adjust only in increments of 1/8 turn and wait
approx. 1 minute after each adjustment until
the value stabilises.
Only for liquid gas:
Adjust only in very small increments (approx.
1/16 turn), and wait approx. 1 minute after each
adjustment until the value stabilises.
• Fold back the suction pipe extension upwards.
• Check the CO
2
content again.
• If necessary, repeat setting.
• Press the “+” and “-” keys simultaneously.
The “Full load mode” is turned off. The full load mode
is also turned of if no key is pressed for 15 minutes.
• Fasten the suction pipe extension.
• Attach the front cover again.
Settings Natural gas (H)
Tolerance
Propane
Tolerance
Unit
CO
2
after 5 min.
full load mode with
appliance front
closed
9.2 ± 1,0 10.2 ± 0,5
Vol.–%
CO
2
after 5 min.
full load mode with
appliance front
removed
9.0 ± 1,0 10.0 ± 0,5
Vol.–%
Set for
Wobbe-Index W
0
15 22.5 kWh/m
3
Table 9.2 Factory gas settings
Replacing components 9
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