Commissioning
Installation and maintenance instructions ecoTEC 0020173113_01 41
10
1
2
10.8 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.
10.12 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.
> Only for VUW boilers: 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 10.4.
If the measured gas flow rate lies outside the tolerance lim-
its specified in ¬ table 10.4, 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 10.4, then proceed as follows:
> Take the boiler out of operation by
– terminating test program P.01 as described in ¬ sec-
tion 10.2.
– 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.
Boiler
Gas flow rate (as per BS EN 483)
Gas in m
3
/h
nominal + 5 % - 10 %
22 4.2 4.4 3.8
26 4.2 4.4 3.8
10.4 Gas flow rates
10.13 Carrying out a full function test
> After completing the installation and the gas setting,
perform a complete function check of the boiler before
starting up the boiler and handing it over to the opera-
tor.
> Start up the boiler in accordance with the relevant oper-
ating instructions.
10.9 Checking for leaks
> Check the gas supply line, the flue gas installation, the
heating installation and the hot water pipes for leaks.
> Check the air/flue gas duct for correct installation.
> Make absolutely sure that the front casing is properly
fitted.
> Check the heating mode (¬ section 10.13.1)
> Check the operation of the hot water generation (¬ sec-
tion 10.13.2)
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