Purging The Heating Installation; Filling And Purging The Hot Water System; Gas Inspection - Vaillant ecoTEC pro VUW 6/5-3 Series Installation And Maintenance Instructions Manual

12. Close all purging valves.
13. Monitor the rising filling pressure in the heating installa-
tion.
14. Fill with water until the required filling pressure is
reached.
15. Close the filling and drainage tap and the cold water
valve.
16. Check all connections and the entire system for leaks.
9.9

Purging the heating installation

1. Select the check programme P.00.
◁
The product does not start up, the internal pump
operates intermittently and purges either the heating
circuit or the hot water circuit.
◁
The display shows the filling pressure of the heating
installation.
2. Make sure that the filling pressure of the heating install-
ation does not fall below the minimum filling pressure.
– ≥ 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
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.
9.10

Filling and purging the hot water system

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.
9.11

Gas inspection

9.11.1 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.
0020244995_04 ecoTEC pro Installation and maintenance instructions
9.11.2 Checking the air/flue pipe/flue gas
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
ply 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 unusal
levels of CO or CO
7. If you cannot eliminate the damage, do not start up the
product.
9.11.3 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.
≥ P
+
Installation Exp
▶
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.
Qn,
DHW
18.9
23.5
24.5
27.8
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 gas boiler commissioning checklist.
recirculation
.
2
H gas in m³/h
nom.
Heatout-
Nom. +5% -10%
put
DHW
18.5 2.00 2.10 1.80
23.0 2.49 2.61 2.24
24.0 2.59 2.72 2.33
27.2 2.94 3.09 2.65
in the sup-
2
P gas in kg/h
Nom. +5% -10%
1.47 1.54 1.32
1.83 1.92 1.64
1.90 2.00 1.71
2.16 2.27 1.94
29