Filling The Condensate Trap; Preventing Low Water Pressure; Flushing The Heating Installation For The First Time ("Cold") - Vaillant ecoTEC plus VU 6/5-5 Series Installation And Maintenance Instructions Manual

Total
Water hardness at specific system volume
heating
output
≤ 20 l/kW
ppm mol/
kW
CaCO₃ m³
> 600 2 0.02
1) Nominal capacity in litres/heating output; in the case of multi-
boiler systems, the smallest single heating output is to be used.
Caution.
Risk of material damage if the heating
water is treated with unsuitable additives.
Unsuitable additives may cause changes in
the components, noises in heating mode and
possibly subsequent damage.
▶
Do not use any unsuitable antifreeze and
corrosion inhibitors, biocides or sealants.
No incompatibility with our products has been detected to
date with proper use of the following additives.
▶
When using additives, follow the manufacturer's instruc-
tions without exception.
We accept no liability for the compatibility of any additive or
its effectiveness in the rest of the heating system.
Additives for cleaning measures (subsequent
flushing required)
–
Adey MC3+
–
Adey MC5
–
Fernox F3
–
Sentinel X 300
–
Sentinel X 400
Additives intended to remain permanently in the
installation
–
Adey MC1+
–
Fernox F1
–
Fernox F2
–
Sentinel X 100
–
Sentinel X 200
Additives for frost protection intended to remain
permanently in the installation
–
Adey MC ZERO
–
Fernox Antifreeze Alphi 11
–
Sentinel X 500
▶
If you have used the above-mentioned additives, inform
the end user about the measures that are required.
▶
Inform the end user about the measures required for frost
protection.
34
> 20 l/kW
> 50 l/kW
≤ 50 l/kW
ppm mol/ ppm mol/
CaCO₃ m³ CaCO₃ m³
2 0.02 2 0.02
9.9

Filling the condensate trap

1)
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.
9.10

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.
9.11 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 ra-
diators so that the contaminated water can completely
drain.
Installation and maintenance instructions 0020244997_07
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