Adjusting The Boiler To The Gas Used On The Channel Islands - Vaillant ecoTEC VU Installation And Maintenance Instructions Manual

10.10 Adjusting the boiler to the gas used on the
Channel Islands
The gas ratio can only be correctly set if the gas flow pres-
sure is within the permissible tolerances at the same time.
For this reason, the two measurements are taken at the
same time.
> Restore the power supply to the boiler.
> Switch on the boiler.
> Change the value of diagnostics code D.051, which was
preset at the factory, to 0 (¬ section 11.1).
> Change the value of diagnostics code D.050, which was
preset at the factory, to 1000 (¬ section 11.1).
10.6 Measuring connection for flue gas
> Connect a CO
measuring instrument to the measuring
2
connection (1) of the boiler.
i
Information for making adjustments with a flue
gas analyser:
Many flue gas analysers work internally with an
O sensor. The CO
2
culated using the measured O
that the gas ratio setting works properly with
these units, the correct energy source [repre-
sentative CO
2 max
uid gas [LPG] must be selected as the energy
source.
Installation and maintenance instructions ecoTEC 0020173113_01
value that is displayed is cal-
2
value. To ensure
2
value] must be set. For this, liq-
1
10.7 Measuring the gas inlet working pressure
> Undo the sealing screw of the measuring nipple (1)
(lefthand screw) at the gas valve using a screwdriver.
> Connect a digital pressure gauge or U-tube manometer
(2) to the measuring nipple (1).
> Open the gas isolation valve of the boiler.
> 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.
> With the boiler operating at full load check that the gas
inlet working pressure at the reference test point (1)
complies with the requirements of ¬ table 10.2.
> Should the pressure recorded at the reference test point
in the boiler be lower than indicated (¬ table 10.2) check
if there is any blockage in the pipework or if the pipe-
work is undersized.
Commissioning 10
1
2
39