Inspection and maintenance
60
Installation and maintenance instructions ecoTEC plus 0020134833_01
12
1
12.1
Measuring the CO
2
concentration
i
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 4.8
).
>
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
2
concentration at the flue gas analysis
point (
1
). Compare the measured value with the corre-
sponding value in
¬ tab. 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
¬ tab. 12.1
, then proceed as described in
the following
¬ section 12.1.4
.
12.1.4
Adjusting the CO
2
concentration (or the air
ratio)
a
Danger!
Increased risk of poisoning due to incor-
rect settings!
If one of the flue gas values is greater than
the acceptable values in
¬ tab. 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.
2
1
12.2
Removing the covering cap for the air ratio setting adjust-
ing screw (gas ratio setting) and making the air ratio set-
ting
If the flue gas value needs to be adjusted, proceed as fol-
lows.
The adjusting screw for making the air ratio setting is
located beneath a covering cap (
1
), which is easy to
unscrew.
>
To do this, push a small flate-blade screwdriver through
the covering cap at the mark and unscrew it.
>
Set the relevant CO
2
value (value with removed front
casing
¬ tab. 12.1
) by turning the screw (
2
). To do this,
use a flat blade screwdriver or a 2.5 mm Allen key.
– Turn to the left: higher CO
2
concentration,
– Turn to the right: lower CO
2
concentration.
i
Natural gas: Only perform the adjustment in
increments of 1 turn and wait approximately
1 minute after each adjustment until the value
stabilises.
i
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" selection button once the settings
have been made.
>
When the adjusting work is complete, screw the covering
cap back in again.
>
Put the front casing back on (
¬ section 4.8
).
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