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

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The boiler is fitted with a flue gas analysis point
(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 10.4).
> 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 plus 0020116700_01
concentration (or the air
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Inspection and maintenance
12.2 Removing the covering cap for the air index setting
adjusting screw (gas setting) and making the air index
setting
If the flue gas value needs to be adjusted, proceed as fol-
lows.
The adjusting screw for making the air index setting is
located beneath a covering cap (1), which is easy to
unscrew.
> To do this, push a small slotted screwdriver through the
covering cap at the mark and unscrew it.
> Set the relevant CO
value (value with removed front
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casing ¬ table 12.1) by turning the screw (2). To do this,
use a small slotted screwdriver or a 2.5 mm Allen key.
– Turn to the left: higher CO
– Turn to the right: lower CO
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Natural gas: Only perform the adjustment in
increments of 1 turn and wait approximately
1 minute after each adjustment until the value
stabilises.
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Liquid gas: Only perform the adjustment in small
increments (approximately 1/2 turns), and wait
approximately 1 minute after each adjustment
until the value stabilises.
> Press the "Cancel" selector button once the settings
have been adjusted.
> When the adjusting work is complete, screw the covering
cap back in again.
> Put the front casing back on (¬ section 4.7).
concentration,
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concentration.
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12
1
2
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