Heating Circuit - Vaillant ecoTEC plus 806 VU GB 806/5-5 Installation And Maintenance Instructions Manual

7 Start-up
Display Meaning
P.02 Minimum load check programme:
After successful ignition, the product is operated at
minimum heat input.
P.06 Filling mode check programme:
The burner and pump are switched off (to fill or drain
the product).
P.00 Purging

Heating circuit

1,2 bar
Cancel
Note
If the product is in error condition, you cannot start
any check programmes. You can detect an error
condition by the fault symbol shown in the left
bottom corner of the display. You must first reset.
To terminate the check programmes, you can press (Can-
cel) at any time.
7.9 Reading off the filling pressure
The product's supply pipe is equipped with an analogue
pressure gauge, a symbolic bar graph display and a digital
pressure gauge.
▶
To read off the digital filling pressure value, press the
button twice.
If the heating installation is full, in order to ensure that it op-
erates smoothly, the indicator on the pressure gauge must
point to the upper half of the grey area or to the middle of the
bar graph display on the display (marked by the dashed limit
values) when the heating installation is cold. This corres-
ponds to a filling pressure of between 0.1 MPa and 0.2 MPa
(1.0 bar and 2.0 bar).
If the heating installation extends over several storeys,
higher filling pressures may be required to avoid air entering
the heating installation.
7.10 Preventing low water pressure
To prevent damage to the heating installation that is caused
by low filling pressure, the product is fitted with a water
pressure sensor. If the filling pressure falls below 0.1 MPa
(1.0 bar), the product indicates low pressure by displaying a
flashing pressure value. If the filling pressure falls below 0.05
MPa (0.5 bar), the product switches off. The display shows
F.22.
▶
Top up the heating water to start the product up again.
The pressure value flashes in the display until a pressure of
0.11 MPa (1.1 bar) or higher has been reached.
▶
If you notice frequent drops in pressure, determine and
eliminate the cause.
20
7.11 Filling and purging the heating installation
1. Flush the heating installation thoroughly before filling it.
2. Select the check programme P.06.
◁
The pumps do not run and the product does not
enter heating mode.
3. Observe the information on the topic of treating
(→ Page 18) heating water.
4. Connect the filling and drainage tap in the heating in-
stallation to a heating water supply, if possible with the
cold water valve, in accordance with the relevant stand-
ards.
5. Open the heating water supply.
6. Open all thermostatic radiator valves.
7. If necessary, check that both service valves on the
product are open.
8. Slowly open the filling and drainage tap so that the wa-
ter flows into the heating system.
Note
The product is equipped with an automatic
air vent. Other measures need to be taken
to allow the heating system to be purged
during filling and during commissioning either
manually or using an automatic air vent.
9. Open any available purging valves in the heating sys-
tem.
10. Purge the lowest radiator until water flows out of the
purging valve without bubbles.
11. Purge all other radiators until the entire heating system
has been filled with water.
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. To purge the heating installation, select the check pro-
gramme P.00.
◁
The product does not start up, the external pump
operates intermittently and purges either the heating
circuit or the hot water circuit. The display shows
the filling pressure of the heating installation.
17. To be able to carry out the purging process properly,
the heating installation filling pressure must not fall be-
low the minimum filling pressure.
–
Minimum heating installation filling pressure:
0.1 MPa (1.0 bar)
Note
The check programme P.00 runs for
7.5 minutes per circuit.
At the end of the filling procedure, the
filling pressure of the heating installation
should be at least 0.02 MPa (0.2 bar) above
the counter-pressure of the expansion
vessel ("Exp") (P
(0.2 bar)).
Installation and maintenance instructions ecoTEC plus 0020134823_04
≥ P
+ 0.02 MPa
Installation Exp