Commissioning
Installation and maintenance instructions ecoTEC pro 0020129672_03
35
10
1
2
10.4 Flue gas and air measure points
Legend:
1 Flue gas measure point
2 Air measure point
For checking the system for recirculation use the air meas-
ure point (
2
).
>
Use the flue gas analyser.
>
If you detect any CO or CO
2
in the fresh air, search for
the flue gas leakage or recirculation.
>
Correct the defects.
>
Check again as described before, if there is any CO or
CO
2
in the fresh air.
>
If you cannot correct the defects you must not start up
the boiler.
10.9.3
Checking the gas flow rate
The boiler is fitted with a multifunctional automatic gas
valve which ensures that the precise air/gas ratio is pro-
vided under all operating conditions. The gas flow rate has
been set during production and does not require adjust-
ment. With the front casing fitted check the gas flow rate of
the boiler as follows:
>
Start the boiler by activating the test program P.01 as
described in
¬ section 10.2
.
>
In addition, ensure that maximum heat can be dissipated
into the heating system by turning up the room thermo-
stat.
>
Alternatively, fully open the hot water taps to ensure full
flow rate through the boiler.
>
Wait at least 5 minutes until the boiler has reached its
operating temperature.
>
Ensure that all other gas appliances in the property are
turned off.
>
Measure the gas flow rate at the gas meter.
>
Check that the gas flow rate is as stated in
¬ table 10.2
.
If the measured gas flow rate lies outside the tolerance lim-
its specified in
¬ table 10.2
, do not operate the boiler and
inform the Vaillant Service Solutions (0870 6060 777).
If the measured gas flow rate is within the tolerance limits
shown in
¬ table 10.2
, then proceed as follows:
>
Take the boiler out of operation by
– terminating test program P.01 as described in
¬ sec-
tion 10.2
.
– Allow the boiler to cool down by turning off water
taps and allow pump overrun to operate for a
minimum of two minutes.
>
Record the boiler maximum gas flow rate onto the
Benchmark gas boiler commissioning checklist.
Nominal net
heat output
in kW
Gas flow rate (as per BS EN 483)
Natural gas in m
3
/h
Propane in kg/h
nomi-
nal
+ 5 % - 10 %
nomi-
nal
+ 5 % - 10 %
18.5
2.02
2.12
1.82
1.48
1.56
1.34
23
2.50
2.63
2.25
1.84
1.93
1.66
24
2.61
2.74
2.35
1.92
2.02
1.73
28
3.10
3.26
2.79
2.25
2.36
2.03
10.2 Gas flow rates
10.9.4 Checking the gas inlet working pressure
>
Ensure that the gas inlet working pressure can be
obtained with all other gas appliances in the property
working.
>
Remove the front casing from the boiler (
¬ section 4.7
).
>
Close the gas isolation valve of the boiler.
1
2
10.5 Measuring the gas inlet working pressure
