Filling The Condensate Trap; Switching The Product On And Off; Using Check Programmes; Preventing Low Water Pressure - Vaillant ecoTEC pro VUW 6/5-3 Series Installation And Maintenance Instructions Manual

9.3

Filling the condensate trap

1. Remove the lower section from the condensate trap (1).
2. Fill the lower section with water up to 10 mm below the
upper edge.
3. Attach the lower section to the condensate trap.
9.4

Switching the product on and off

▶
Press the on/off button on the product.
◁
The display shows the basic display.
9.5

Using check programmes

Call up the installer level + 1x
By activating various check programmes, you can trigger
special functions on the product.
Check programmes – Overview (→ Page 48)
9.6

Preventing low water pressure

To ensure that the heating installation operates 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
in the display (marked by the dashed limit values) when the
heating installation is cold. This corresponds to a filling pres-
sure 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.
If the filling pressure falls below 0.08 MPa (0.8 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.
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9.7 Flushing the heating installation for the first
time ("cold")
Note
The complete heating system must be flushed
at least twice: Once with cold water and once
with hot water in accordance with the following
instructions.
1. Check whether all thermostatic radiator valves and both
service valves on the product are open.
2. Connect a hose to the drain valve that is located at the
lowest position in the heating system.
3. Open the radiator valves and the drain valves so that
the water can drain quickly. Start at the next point in the
installation and open the purging valves on the radiators
so that the contaminated water can completely drain.
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4. Close the draining cocks.
5. Refill the heating system with water.
6. Check that the expansion relief valve of the heating
system is functioning correctly by turning the handle
on the valve.
7. Check the pressure in the heating system and top up
with water if necessary.
8. Close the filling valve and the cold water tap.
9.8

Filling the heating installation

1. Flush the heating installation through.
2. Undo the cap of the automatic air vent (1) by one to two
rotations and leave it open, as the product purges itself
via the automatic air vent even in continuous mode.
3. Select the check programme P.06.
◁
The diverter valve moves to the mid-position, the
pumps do not run and the product does not switch
to heating mode.
4. Observe the information on treating heating water.
(→ Page 27)
5. 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.
6. Open the heating water supply.
7. Open all radiator valves (thermostatic radiator valves) of
the heating installation.
8. If necessary, check that both service valves on the
product are open.
9. Slowly open the filling and drainage tap so that the wa-
ter flows into the heating system.
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.
Installation and maintenance instructions ecoTEC pro 0020244995_04
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