ecoTEC pro - Vaillant

12.1 Measuring the CO2 concentration
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The boiler is fitted with a flue gas analysis point
(1). A suitable flue gas analyser can be connected
to this point to establish the combustion
performance of the boiler.
> Remove the front casing (¬ section 4.7).
> Start the testing program P.01 (¬ section 10.2).
> Wait at least 5 minutes until the boiler reaches its operating
temperature.
> Measure the CO2 concentration at the flue gas analysis
point (1). Compare the measured value with the corresponding
value in ¬ table 12.1.
> If all these points are as required, proceed as described
in ¬ section 12.2.
> If one of the flue gas values is greater than the acceptable
values in ¬ table 12.1, then proceed as described in
the following ¬ section 12.1.4.
12.1.4 Adjusting the CO2 concentration (or the air
ratio)
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Danger!
Increased risk of poisoning due to incorrect
settings!
If one of the flue gas values is greater than
the acceptable values in ¬ table 12.1 then:
> Check the integrity of the complete flue
gas installation.
> Check the integrity of the combustion
circuit seals.
> Check the gas inlet working pressure.
> Check the gas flow rate.
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Inspection and maintenance 12
12.2 Removing the covering cap for the air ratio setting adjusting
screw (gas setting) and making the air ratio setting
If the flue gas value needs to be adjusted, proceed as
follows.
The adjusting screw for making the air ratio setting is
located beneath a blue covering cap (1), which is easy to
remove.
> Remove the yellow sticker.
> Remove the covering cap.
> Set the relevant CO2 value (value with removed front
casing ¬ table 12.1) by turning the screw (2). Use a
2.5 mm Allen key for this.
– Turn to the left: higher CO2 concentration,
– Turn to the right: lower CO2 concentration.
i Natural
i Liquid
gas: Only perform the adjustment in
small increments of 1/8 turn and wait approximately
1 minute after each adjustment until the
value stabilises.
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.
> Press the "Cancel" selection button once the settings
have been adjusted.
> When the adjusting work is complete, put the covering
cap back on again.
> Put the front casing back on (¬ section 4.7).
Installation and maintenance instructions ecoTEC pro 0020129672_03 47
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