Pressure Relief Valve; Venting - Vaillant ecoTEC VU Installation And Maintenance Instructions Manual

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2 Safety
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.
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
surface
output
kW
(mg/l CaCO
No require-
< 50
> 50 to £ 200
>200 to £ 600
> 600
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 fill-
ing 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, desali-
nation, hardness stabilisation or desludging).
2.2 Guideline values for heating water: water hardness
10
2)
> 20 l/kW <
20 l/kW
50 l/kW
3 3
mol/m mol/m
) (mg/l CaCO ) (mg/l CaCO
3 3
ment or
2
(200)
1)
< 3
1)
< (300)
2 1.5
(200) (150)
1.5 0.02
(150) (2.0)
0.02 0.02
(2.0) (2.0)

2.4.9 Pressure relief valve

The boiler is equipped with a pressure relief valve. This
safety device is required for all sealed central heating sys-
tems, is preset to 3 bar and is fitted with a 15 mm compres-
sion connection for the discharge pipe, whose diameter
must not be less than 15 mm. The pressure relief valve must
not be used for draining purposes.
For situations where the discharge cannot be easily routed
Vaillant have a remote pressure relief valve mounting kit
available which can be used to provide a suitable way to
achieve this.

2.4.10 Venting

The boiler is fitted with an automatic air vent. Other meas-
ures need to be taken to allow the heating system to be
either automatically or manually vented during filling and
during commissioning.
> 50 l/kW
3
mol/m
)
3
0.02
(2.0)
0.02
(2.0)
0.02
(2.0)
0.02
(2.0)
Installation and maintenance instructions ecoTEC 0020173113_01
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