Check Co 2 Content And If Necessary Set (Air-Ratio Adjustment) - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

9.7 Check CO content and if necessary set (air-
2
ratio adjustment)
Fig. 9.7 Carrying out measurement of CO
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 content on the flue gas measuring
2
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
-> Turn to the right: lower CO
Instructions for installation and servicing ecoTEC
1
levels, preparing for
2
content,
2
content,
2
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 content again.
2
• 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.
2
• Fasten the suction pipe extension.
• Attach the front cover again.
Settings
CO after 5 min.
2
full load mode with
appliance front
closed
CO after 5 min.
2
full load mode with
appliance front
removed
Set for
Wobbe-Index W
0
Table 9.2 Factory gas settings
Parts replacement 9
Natural gas (H) Propane
Tolerance Tolerance
9.2 1,0 10.2 0,5
9.0 1,0 10.0 0,5
15 22.5
Unit
Vol.–%
Vol.–%
3
kWh/m
53