Avoiding Danger Arising From Insufficient Water Pressure - Vaillant ecoFIT sustain 825 Installation And Maintenance Instructions Manual

7 Start-up
If the value is below 6.5 or above 8.5, clean the installa-
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tion and treat the heating water.
Ensure that oxygen cannot get into the heating water.
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Checking the filling and supplementary water
Before filling the installation, measure the hardness of the
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filling and supplementary water.
Treating the filling and supplementary water
Observe all applicable national regulations and technical
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rules when treating the filling and supplementary water.
Provided the national regulations and technical rules do not
stipulate more stringent requirements, the following applies:
You must treat the heating water in the following cases
– If the entire filling and supplementary water quantity dur-
ing the operating life of the system exceeds three times
the nominal volume of the heating installation, or
–
If the guideline values listed in the following table are not
met, or
– If the pH value of the heating water is less than 6.5 or
more than 8.5.
Total
Water hardness at specific system volume
heating
output ≤ 20 l/kW
ppm mol/
kW
CaCO₃ m³
< 50 < 300 < 3
> 50 200 2
to ≤ 200
> 200 150 1.5
to ≤ 600
> 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.
The use of unsuitable heating water may
cause aluminium corrosion and a result-
ing lack of leak-tightness.
In contrast to steel, grey cast iron or copper,
for example, aluminium reacts with alkaline
heating water (pH value > 8.5) to produce
substantial corrosion.
When using aluminium, make sure that
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the pH value of the heating water is
between 6.5 and a maximum of 8.5.
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
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corrosion inhibitors, biocides or sealants.
16
> 20 l/kW
> 50 l/kW
≤ 50 l/kW
ppm mol/ ppm mol/
CaCO₃ m³ CaCO₃ m³
200 2 2 0.02
150 1.5 2 0.02
2 0.02 2 0.02
2 0.02 2 0.02
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-
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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
1)
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
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the end user about the measures that are required.
Inform the end user about the measures required for frost
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protection.
7.5 Avoiding danger arising from insufficient
water pressure
The filling pressure must be between 0.10 and 0.15 MPa
(1.0 and 1.5 bar).
If the heating installation extends over several storeys,
higher filling pressures may be required to avoid air entering
the heating installation.
If the water pressure falls below 0.05 MPa (0.5 bar), the
value flashes in the display.
If the water pressure falls below 0.03 MPa (0.3 bar), the
product switches off. The display shows 0.0 MPa (0.0 bar).
Fault F.22 is stored in the fault list.
Top up the water in the heating installation to start up the
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product again.
The pressure value flashes in the display until a
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pressure of 0.05 MPa (0.5 bar) or higher has been
reached.
Installation and maintenance instructions ecoFIT sustain 0020230529_04