36
Installation and maintenance instructions 0020244997_07
– ≥
0.08 MPa (
≥
0.80 bar)
◁
At the end of the filling procedure, the filling pres-
sure of the heating installation should be at least
0.02 MPa (0.2 bar) above the counter-pressure
of the expansion vessel ("Exp") (P
Installation
≥
P
Exp
+
0.02 MPa (0.2 bar)).
3.
If there is still too much air in the heating installation
at the end of the check programme
P.00
, repeat the
check programme.
9.14
Filling and purging the hot water system
Validity:
Product with integrated hot water generation
1.
Open the cold water stop valve on the product.
2.
Fill the hot water system by opening all the hot water
draw-off valves until water escapes.
9.15
Gas inspection
9.15.1 Checking the factory-set gas setting
Caution.
Risk of material damage caused by mak-
ing unauthorised settings.
▶
Never modify the factory setting of the gas
pressure regulator of the gas valve.
▶
Before you start up the product, compare the gas group
information on the data plate with the gas group available
at the installation site.
Condition
: The product design is not compatible with the local gas group
Only Vaillant Service may perform a gas conversion.
If a gas conversion to liquefied petroleum gas has been car-
ried out, the smallest possible partial load is higher than is
shown on the display. The correct values can be found in the
Technical data in the appendix.
▶
Call Vaillant Service (0330 1003 143).
▶
Do not start up the product.
Condition
: The product design is compatible with the local gas group
▶
Proceed as described below.
9.15.2 Checking the air/flue pipe/flue gas
recirculation
1.
Check the flue gas installation is intact in accordance
with the latest gas safe technical bulletin and informa-
tion supplied in the installation instructions.
2.
For extended flue gas installations check for flue gas
recirculation using the air analysis point.
3.
Use a flue gas analyser.
4.
If you discover unusual levels of CO or CO
2
in the
supply air, search for the leak in the flue system or for
signs of flue gas recirculation.
5.
Eliminate the damage properly.
6.
Check again whether the supply air contains any un-
usual levels of CO or CO
2
.
7.
If you cannot eliminate the damage, do not start up the
product.
9.15.3 Checking the gas flow rate
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 up the product with the check programme
P.01
.
▶
In addition, ensure that maximum heat can be dissipated
into the heating system by turning up the room thermo-
stat.
▶
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.
▶
Compare the measured values with the corresponding
values in the table.
Qnw from the data
plate
H gas in m
³
/h
Nom.
+5%
−
10%
15.3
1.62
1.70
1.46
18.4
1.95
2.05
1.76
24.7
2.61
2.74
2.35
25.7
2.72
2.86
2.45
28.6
3.03
3.18
2.73
30.6
3.24
3.40
2.92
35.7
3.78
3.97
3.40
Condition
: Gas flow rate not in the permissible range
▶
Check all of the piping and ensure that the gas flow rates
are correct.
▶
Only put the product into operation once the gas flow
rates have been corrected.
Condition
: Gas flow rate in the permissible range
▶
End the check programme
P.01
.
▶
Allow the boiler to cool down by allowing pump overrun to
operate for a minimum of 2 minutes.
▶
Record the boiler maximum gas flow rate onto the
Benchmark Checklist.
9.15.4 Checking the gas flow pressure
1.
Ensure that the gas inlet working pressure can be ob-
tained with all other gas appliances in the property
working.
2.
Close the gas stopcock.
