Pressure Relief Valve - Vaillant ecoTEC plus SERIES Installation And Maintenance Instructions Manual

a
2 Safety
The boiler is suitable for Minibore and Microbore systems.
Water lines are to be copper pipes in accordance with
BS 2871, Part 1. These must be thoroughly cleaned, espe-
cially when connecting a new boiler to an existing system.
The use of unsuitable heating water can cause alu-
minium corrosion and a resulting 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 the pH value of
the heating water is between 6.5 and a maximum of 8.5.
Risk of damage if the heating water is treated with
unsuitable frost or corrosion protection agents.
Frost and corrosion protection agents can cause changes to
seals, noise during heating mode and may lead to
other consequential damage.
> Do not use any unsuitable frost or corrosion protection
agents.
Mixing additives with the heating water can result in mate-
rial damage. However no incompatibility with Vaillant boil-
ers has been detected with proper use of the following
products over a long period.
> When using additives, follow the manufacturer's instruc-
tions without exception.
Vaillant accepts no liability for the compatibility of any addi-
tive or its effectiveness in the rest of the heating installa-
tion.
Additives for cleaning measures
(subsequent flushing required)
– Fernox F3
– Sentinel X 300
– Sentinel X 400
Additives intended to remain permanently in the
system
– Fernox F1
– Fernox F2
– Sentinel X 100
– Sentinel X 200
Additives for frost protection intended to remain
permanently in the system
– Fernox Antifreeze Alphi 11
– Sentinel X 500
> Inform the operator of the necessary measures if you
have used these additives.
> Inform the operator about the required measures for
frost protection.
Permissible water hardness
> Observe all valid national and technical regulations when
conditioning filling and supplementary water.
10
Provided the national regulations and technical standards
do not stipulate more stringent requirements, the following
applies:
> You must condition the heating water in the following
cases:
– If the entire filling and supplementary water quantity
during the operating life of the system exceeds three
times the nominal volume of the heating installation
or
– If the limit values shown in the tables are not
observed.
Overall hardness at smallest boiler heating
Total heating
2)
surface
output
20 l/kW
mol/m
kW
(mg/l CaCO
No require-
ment or
< 50
1)
< 3
< (300)
2
> 50 to £ 200
(200)
1.5
>200 to £ 600
(150)
0.02
> 600
(2.0)
1) on systems with circulation water heaters and for systems with
electric heating elements
2) from the specific system volume (nominal capacity in litres/heating
output; for multiple boiler systems, the lowest individual heating
output should be used). This data only applies up to 3 times the
system volume for filling and top-up water. If 3 times the system
volume figure is exceeded, the water must be treated in exactly the
same way as if the limits quoted in table 2.2 were exceeded
(softening, desalination, hardness stabilisation or desludging).
2.2 Guideline values for heating water: water hardness
Permissible salt content
Heating water charac-
Unit
teristics
Electrical conductivity
mS/cm
at 25 °C
Appearance
pH value at 25 °C
Oxygen mg/l
1) For aluminium and aluminium alloys, the pH range is restricted
from 6.5 to 8.5.
2.3 Guideline values for heating water: Salt content

2.5.8 Pressure relief valve

The boiler is equipped with a pressure relief valve. This
safety device is required for all sealed central heating sys-
Installation and maintenance instructions ecoTEC plus 0020116700_01
> 20 l/kW
> 50 l/kW
< 50 l/kW
3 3
mol/m mol/m
) (mg/l CaCO ) (mg/l CaCO
3 3
2 0.02
(200) (2.0)
1)
1.5 0.02
(150) (2.0)
0.02 0.02
(2.0) (2.0)
0.02 0.02
(2.0) (2.0)
Low-salt Saline
< 100 100 - 1500
Free of sedimentary materials
1) 1)
8.2 - 10.0 8.2 - 10.0
< 0.1 < 0.02
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3
)
3