Start-up
Installation and maintenance instructions ecoTEC plus 0020116700_01 45
10
1
2
10.6 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.
10.11.3 Checking the gas flow rate
The boiler is fitted with an electronic gas air system which
ensures that the precise air/gas ratio is provided under all
operating conditions. The gas flow rate has been set during
production and does not require adjustment. 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 ¬section10.4.
> In addition, ensure that maximum heat can be dissipated
into the heating system by turning up the room thermo-
stat.
> Alternatively, for VUW-boilers: 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 ¬table10.2.
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
¬section10.4.
– Only for VUW-boilers: 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 437)
Natural gas in m
3
/h Propane in kg/h
nomi-
nal
+ 5 % - 10 %
nomi-
nal
+ 5 % - 10 %
12 1.31 1.38 1.18 0.96 1.01 0.86
15 1.64 1.72 1.48 1.20 1.26 1.08
18 1.97 2.07 1.77 1.44 1.51 1.30
24 2.61 2.74 2.35 1.92 2.02 1.73
30 3.27 3.43 2.94 2.40 2.52 2.16
37 4.03 4.23 3.63 2.96 3.11 2.66
24 2.61 2.74 2.35 1.92 2.02 1.73
31 3.30 3.47 2.97 2.42 2.54 2.18
37 4.15 4.36 3.74 3.05 3.20 2.75
10.2 Gas flow rates
10.11.4 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 (¬section4.7).
> Close the gas isolation valve of the boiler.
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