Vaillant ECOTEC PLUS VU 80 Installation And Maintenance Instructions Manual page 46

13 Inspection and maintenance
13.1.3 Checking the CO
The CO content must be checked/set in the following
2
cases:
– When replacing the gas valve
– If you suspect incorrect combustion.
– At initial start-up
– During any maintenance work
– When replacing the fan or burner
– If there are changes to the gas installation
13.1 Checking the CO content
2
i
The boiler is equipped with a flue gas analysis
point (1). A suitable flue gas measuring instru-
ment can be used to check the combustion per-
formance of the measuring instrument at this
analysis point.
> Remove the front casing (¬ section 4.6).
> Start check programme P.1 (¬ section 11.4).
> Wait at least 5 minutes until the boiler reaches its
operating temperature.
> If required, remove the upper casing.
> Measure the CO
content at the flue gas analysis point
2
(1). Compare the measured value with the corresponding
value in ¬ table 13.1.
Settings
CO after 5 minutes full load
2
operation with front casing
closed
CO after 5 minutes full load
2
operation with front casing
removed
Set for Wobbe Index W
0
13.1 Gas default settings
46
content
2
Natural gas H
Unit
Tolerance
Vol.-% 9.0 +/- 0.5
Vol.-% 8.8 +/- 0.5
3
kWh/m 15
> If all these points meet the requirements, continue in
accordance with ¬ section 13.2.
> If one of the flue gas values is above the permissible
value in ¬ table 13.1, continue in accordance with the
following ¬ section 13.1.4.
13.1.4 Setting the CO
ratio)
Danger!
a
1
Increased risk of poisoning from incor-
rect setting.
If one of the flue gas values is above the
permissible values in ¬ table 13.1:
> Check that the entire flue gas system is
in good condition.
> Check that the seals of the combustion
system are in good condition.
> Check the gas connection pressure (gas
flow pressure).
> Check the gas volume flow.
13.2 Carry out the CO
ecoTEC plus installation and maintenance instructions 0020134823_01
content (or setting the air
2
measurement, air index setting
2
806/5-5
1
1
1006/5-5
1206/5-5