43Instructions for installation and servicing ecoTEC 839592_12
Note
The boiler is fitted with a flue gas analysis
point (4). A suitable flue gas analyser can be
connected to this point to establish the
combustion performance of the boiler.
• Remove the front casing.
• Start the testing program P.1.
• Wait at least 5 minutes until the boiler reaches its
operating temperature.
• Measure the CO
2
concentration at the flue gas
analysis point (4). Compare the measured value with
the corresponding value in Table 7.1.
• If all these points are as required, proceed as
described in section 7.1.5.
• If one of the flue gas values is greater than the
acceptable values in Table 7.1, then proceed as
described in the following section 7.1.4.
7.1.4 Adjusting the CO
2
concentration
(or the air ratio)
d
Danger!
Increased risk of poisoning due to incorrect
settings!
Incorrect setting may increase the risk of
poisoning.
• If one of the flue gas values is greater than
the acceptable values in Table 7.1 then check
- the integrity of the complete flue gas
installation
- the integrity of the combustion circuit seals
- the gas inlet working pressure
- the gas flow rate.
If the flue gas value needs to be adjusted,
• unfasten the screw (Fig. 7.1, 2) and
• fold the air intake pipe (Fig. 7.1, 3) forwards through
90°. Do not remove the air intake pipe.
• Specify the required flue gas value if necessary (value
with front casing of boiler removed, see Table 7.1) by
turning the screw of the main throttle (Fig. 7.1, 1).
h
Note
Use a 4 mm hexagon socket spanner to turn
the screw.
• Turn to the left: higher CO
2
concentration,
• Turn to the right: lower CO
2
concentration.
h
Note
Natural gas: Only perform the adjustment in
increments of 1/8 turn and wait approximately
1 minute after each adjustment until the value
stabilises.
Liquid gas: Only perform the adjustment in very
small increments (approximately 1/16 turns),
and wait approximately 1 minute after each
adjustment until the value stabilises.
• After performing the adjustments, fold the air intake
pipe back up.
• Check the CO
2
concentration once again.
• If necessary, repeat the setting process.
• Push the „i“ button to deactivate the full load mode.
The full load mode is also deactivated if no button is
pushed for 15 minutes.
• The adjusting screw shall be sealed after the
adjustment.
• Re-secure the air intake pipe with the screw (2).
• Put the front casing back on.
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
CO value with full load < 250 < 250 ppm
CO/CO
2
< 0,0031 < 0,0026
Table 7.1 Factory gas setting
d
Danger!
Risk to life due to poisoning!
CO is an extremely toxic gas. Risk to life due to
excessive CO concentrations.
• If you are not able to adjust the boiler
correctly and the flue gas values remain
higher than allowed in Table 7.1, call the
Vaillant Service Solutions.
• Do not start up the boiler!
Inspection and maintenance 7
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