6.2.2 Checking The Gas Flow Rate; 6.2.3 Checking The Gas Inlet Working Pressure - Vaillant ecoTEC exclusive 832 Installation And Maintenance Instructions Manual

6 Start-up

6.2.2 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
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.1 as
described in Section 9.2.
> In addition, ensure that maximum heat can be dissi-
pated into the heating system by turning up the room
thermostat.
> 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 6.3.
> If the measured gas flow rate lies outside the toler-
ance limits specified in Table 6.3, do not operate the
boiler and inform the Vaillant Service Solutions
(0870 6060 777).
If the measured gas flow rate is within the tolerance lim-
its shown in Table 6.3, then proceed as follows:
> Take the boiler out of operation by
– Pressing the + and i buttons simultaneously and
turn down both thermostat control knobs.
– Allow the boiler to cool down by turning off water
taps and allow pump overrun to operate for a mini-
mum of two minutes.
> Record the boiler maximum gas flow rate onto the
Benchmark gas boiler commissioning checklist.
Nominal net heat
Boiler input in kW as per
ecoTEC exclusive 832
ecoTEC exclusive 838
Table 6.3 Gas flow rates
30
BS EN 483
nominal
32 3,39
38 4,02

6.2.3 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.
> Close the gas isolation valve of the boiler.
Fig. 6.6 Measuring the gas inlet working pressure
Gas flow rate
3
Natural gas in m /h
+ 5 % - 10 %
3,56 3,05
4,22 3,62
Installation and maintenance instructions ecoTEC exclusive 0020017768_07
Propane in kg/h
nominal + 5 %
2,49 2,61
2,95 3,10
1
2
- 10 %
2,24
2,66