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7
Inspection and maintenance
4
3
2
Fig. 7.1 Measuring the CO
2
ratio (gas setting)
Legend:
1
Main throttle
2 Screw
3 Air intake pipe
4 Flue gas analysis point
i
The boiler is fitted with a flue gas analysis
point (4). A suitable flue gas analyser can be
connected to this point to establish the com-
bustion performance of the boiler.
> Remove the front casing.
> Start the testing program P.1.
> Wait at least 5 minutes until the boiler reaches its
operating temperature.
> Measure the CO
concentration at the flue gas analy-
2
sis point (4). Compare the measured value with the
corresponding value in Table 7.1.
> If all these points are as required, proceed as
described in section 7.1.5.
> If one of the flue gas values is greater than the
acceptable values in Table 7.1, then proceed as
described in the following section 7.1.4.
52
concentration, specifying the air
7.1.4
Adjusting the CO2 concentration
(or the air ratio)
1
a
Danger!
Increased risk of poisoning due to incorrect
settings!
Incorrect setting may increase the risk of poi-
soning.
> If one of the flue gas values is greater than
the acceptable values in Table 7.1 then
check
- the integrity of the complete flue
gas installation
- the integrity of the combustion
circuit seals
- the gas inlet working pressure
- the gas flow rate.
If the flue gas value needs to be adjusted,
> unfasten the screw (Fig. 7.1, 2) and
> fold the air intake pipe (Fig. 7.1, 3) forwards through
90°. Do not remove the air intake pipe.
> Specify the required flue gas value if necessary (value
with front casing of boiler removed, see Table 7.1) by
turning the screw of the main throttle (Fig. 7.1, 1).
i
Use a 4 mm hexagon socket spanner to turn
the screw.
> Turn to the left: higher CO
> Turn to the right: lower CO
i
Natural gas: Only perform the adjustment in
increments of 1/8 turn and wait approximately
1 minute after each adjustment until the value
stabilises.
Liquid 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.
> After performing the adjustments, fold the air intake
pipe back up.
> Check the CO
concentration once again.
2
> If necessary, repeat the setting process.
> Push the "i" button to deactivate the full load mode.
The full load mode is also deactivated if no button is
pushed for 15 minutes.
> The adjusting screw shall be sealed after the adjust-
ment.
> Re-secure the air intake pipe with the screw (2).
> Put the front casing back on.
Instructions for installation and servicing ecoTEC 839592_13
concentration,
2
concentration.
2
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