Adjusting The Co (Or The Air Ratio); Concentration - Vaillant ecoTEC pro Installation And Maintenance Instructions Manual

12.1 Measuring the CO

concentration

2
The boiler is fitted with a flue gas analysis point
i
(1). A suitable flue gas analyser can be con-
nected 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 oper-
ating temperature.
> Measure the CO concentration at the flue gas analysis
2
point (1). Compare the measured value with the corre-
sponding 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 accepta-
ble values in ¬ table 12.1, then proceed as described in
the following ¬ section 12.1.4.
12.1.4 Adjusting the CO
ratio)
Danger!
a
Increased risk of poisoning due to incor-
rect 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.
Installation and maintenance instructions ecoTEC pro 0020129672_03
concentration (or the air
2
Inspection and maintenance
1
12.2 Removing the covering cap for the air ratio setting adjust-
ing 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 CO
casing ¬ table 12.1) by turning the screw (2). Use a
2.5 mm Allen key for this.
– Turn to the left: higher CO
– Turn to the right: lower CO
Natural gas: Only perform the adjustment in
i
small increments of 1/8 turn and wait approxi-
mately 1 minute after each adjustment until the
value stabilises.
Liquid gas: Only perform the adjustment in very
i
small increments (approximately 1/16 turns), and
wait approximately 1 minute after each adjust-
ment 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).
value (value with removed front
2
concentration,
2
concentration.
2
12
1
2
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