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Installation and maintenance instructions ecoTEC 0020029172_03
5.4 Gas
connection
d
Danger!
Danger of injury to persons and/or material
damage due to improper installation!
The Vaillant ecoTEC boiler may only be
installed by a recognised skilled trade company
who also assumes the responsibility for proper
installation and initial start-up of the boiler.
The legal directives and the local regulations
for gas supply companies must be observed.
a
Caution!
Ensure strainless assembly of the gas pipes to
avoid leakages!
h
Note!
Maintain the same gas pipe dimension all the
way to the boiler and avoid reducing the dimen-
sion downstream of the gas meter.
a
Caution!
The gas valve may be damaged if the test
pressure or operating pressure is exceeded!
You must check the tightness of the gas valve
only using a maximum pressure of 110 mbar!
1
Fig. 5.8 Fitting the gas connection
The boiler must be connected to your gas pipe via a gas
isolation valve.
• Screw the boiler‘s gas supply pipe (
1
) gas-tight with
the gas isolation valve (
5
, see Fig. 5.9). To do this, use
the R3/4 crimp connection supplied with the boiler.
This is also suitable for the connection of a R3/4 gas
isolation valve.
• Inspect the gas connection for leakage.
5.5 Heating
connection
a
Caution!
Ensure strainless assembly of the supply lines
to avoid leakages in the heating installation!
The boiler is connected to the heating flow and return
via service valves.
2
3
4
1
5
Fig. 5.9 Heating connection
• Fit the flow, return and gas isolation valves (
3
,
4
,
5
)
including the seals onto the flow, return and gas pipes.
Do not overtighten and ensure the joints are checked
for leaks after fitting.
a
Caution!
It is essential to use the combined filling and
emptying valve (3, Fig. 5.10) in the return for
filling the boiler without fail, as otherwise the
bleeding of the boiler cannot be ensured.
h
Note!
We recommend the use of seals made of a fibre-
based material similar to cardboard instead of
materials similar to rubber as the latter can
plastically deform and cause pressure losses.
Installation 5
Содержание ecoTEC VU 466/4
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