Commissioning
Installation and maintenance instructions ecoTEC plus 0020134833_01
47
10
10.12.3
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
¬ section 10.4
.
>
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
¬ tab. 10.2
.
If the measured gas flow rate lies outside the tolerance lim-
its specified in
¬ tab. 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
¬ tab. 10.2
, then proceed as follows:
>
Take the boiler out of operation by
– terminating test program P.01 as described in
¬ sec-
tion 10.4
.
– 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 %
37
4.15
4.36
3.74
3.05
3.20
2.75
10.2
Gas flow rates
10.12.4 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 4.8
).
>
Close the gas isolation valve of the boiler.
1
2
10.7 Measuring the gas inlet working pressure
>
Undo the sealing screw of the measuring nipple (
1
)
(lower 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 13.4
.
>
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.
>
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
¬ tab. 10.3
.
>
Should the pressure recorded at the reference test point
in the boiler be lower than indicated (
¬ tab. 10.3
) check
if there is any blockage in the pipework or if the pipe-
work is undersized.
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