Vaillant ecoTEC plus VUI Series Installation And Maintenance Instructions Manual page 40

▶
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
15.3
18.4
24.7
25.7
28.6
30.6
35.7
Condition: Gas flow rate not in the permissible range
▶
Check the compliance with the local gas group.
(→ Section 9.13.1)
▶
Check the gas supply and monitor the flow pressure dur-
ing the test operation. (→ Section 9.13.3)
▶
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.
9.14 Thoroughly flushing the heating installation
("hot")
1. Operate the appliance until the boiler and the heating
system are up to temperature.
2. Check the heating system for leaks.
3. Connect a hose to the drain valve located at the lowest
position of the heating system.
4. Shut off the boiler, open the drain valve and all purge
valves on the radiators and allow the water to flow out
of the heating system and the boiler quickly and fully.
5. Close the drain valve.
6. Fill the heating system again with water as described
in Filling the heating installation (→ Section 9.9) and
Purging the heating installation (→ Section 9.10).
7. Re-fill the system until the system design pressure of
0,1 MPa (1,0 bar) is attained.
40
H gas in m³/h
−10%
Nom. +5%
1.62 1.70 1.46
1.95 2.05 1.76
2.61 2.74 2.35
2.72 2.86 2.45
3.03 3.18 2.73
3.24 3.40 2.92
3.78 3.97 3.40
Note
The actual reading on the digital pressure
gauge should ideally be 0,05 MPa (0,5 bar)
plus an additional pressure corresponding
to the highest point of the system above
the base of the boiler – 10 m head equals
an additional 1 bar reading on the pressure
gauge. The minimum pressure should not
be less than 0,1 MPa (1 bar) in any install-
ation. If the system is to be treated with an
inhibitor it should be applied at this stage in
accordance with the manufacturer's instruc-
tions.
9.15 Checking the heating mode
1. Ensure that there is a heat demand.
Navigate to MENU → SETTINGS → Installer level →
2.
Data overview.
◁
If the product is working correctly, the display
shows S.004.
9.16 Checking the domestic hot water generation
1. Make sure that there is a domestic hot water demand.
Call up MENU → SETTINGS → Installer level → Data
2.
overview.
◁
If the domestic hot water cylinder is charged cor-
rectly, S.024 appears in the display.
3. Check the domestic hot water temperature: Actual
DHW temperature.
Condition: Control connected
▶
Set the domestic hot water temperature on the boiler to
the maximum possible temperature.
▶
Set the target temperature for the connected domestic
hot water cylinder on the control (→ Operating and install-
ation instructions for the control).
◁
The boiler adopts the target temperature which is set
on the control.
9.17 Checking leak-tightness
▶
Check the gas-carrying components, the heating circuit
and the domestic hot water circuit for tightness.
▶
Check that the air/flue pipe has been installed correctly.
▶
Check whether the front panel is fitted.
10 Adapting the unit to the installation
10.1 Setting parameters
▶
Navigate to the Appliance config. menu and set the
most important system parameters.
▶
Navigate to the Start inst. assistant menu and restart
the installation assistant.
▶
Navigate to the Diagnostics menu menu and set addi-
tional system parameters.
Diagnostics codes (→ Appendix D)
Installation and maintenance instructions 0020308121_04