Technical data

Inspection and maintenance
58 Installation and maintenance instructions ecoTEC plus 0020116700_06
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4.7).
> 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
2
concentration at the flue gas analysis
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
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 ¬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.
2
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 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 slotted screwdriver through the
covering cap at the mark and unscrew it.
> Set the relevant CO
2
value (value with removed front
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
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 adjusted.
> When the adjusting work is complete, screw the covering
cap back in again.
> Put the front casing back on (¬section4.7).