Connecting Gas And Water - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

5 Installation
5.5

Connecting gas and water

Danger!
Risk of explosion or scalding caused by
incorrect installation.
Mechanical stresses in the connection pipes
may lead to leaks.
▶
Make sure that the connection pipes are
free from mechanical stress when they
are installed.
Caution.
Risk of material damage due to heat trans-
fer during soldering.
▶
Only solder connectors if the connectors
are not yet screwed to the service valves.
Caution.
Risk of material damage caused by
residues in the pipelines.
Welding remnants, sealing residues, dirt or
other residues in the pipelines may damage
the product.
▶
Flush the heating installation thoroughly
before installing the product.
Caution.
Risk of material damage caused by
changes to the pipes that have already
been connected.
▶
Only bend connection pipes if they have
not yet been connected to the product.
Seals made of rubber-like materials may be subject to plastic
deformation, which can lead to pressure losses.
▶
Use fibre seals.
5.5.1 Gas connection
Caution.
Risk of material damage due to the gas
leak-tightness test.
At a test pressure of >11 kPa (110 mbar), gas
leak-tightness tests may cause damage to
the gas valve assembly.
▶
If, during gas leak-tightness tests, you
also place the gas pipes and the gas valve
assembly in the product under pressure,
use a max. test pressure of 11 kPa
(110 mbar).
▶
If you cannot limit the test pressure to
11 kPa (110 mbar), close any gas stop-
cocks that are installed upstream from the
16
product before you carry out the gas leak-
tightness test.
▶
If, during gas leak-tightness tests, you
have closed the gas stopcock that is in-
stalled upstream of the product, relieve
the gas line pressure before you open this
gas stopcock.
▶
Do not reduce the gas pipe dimension downstream of the
gas meter.
▶
Maintain the dimension right up to the product.
▶
Select the correct gas stopcock.
▶
Remove the residues from the gas pipe by blowing
through the gas pipe beforehand.
B
A
1
▶
If required, use a suitable sealant.
▶
Undo the press connection (A).
▶
Secure the gas stopcock to the compression fitting (B).
▶
Install the unit (1) on the gas pipe at the product's outlet
(C) by tightening the compression fitting (D).
▶
Install the gas pipe such that it is free from mechanical
stress in accordance with the recognised rules of techno-
logy.
▶
Purge the gas pipe before start-up.
5.5.2 Checking the gas line for leak-tightness
▶
Check the entire gas line properly for leak-tightness.
5.5.3 Hydraulic connection
Caution.
Risk of material damage caused by corro-
sion
Due to non-diffusion-tight plastic pipes in the
heating installation, air gets into the heating
water. Air in the heating water causes corro-
sion in the heat generator circuit and in the
product.
▶
If you use non-diffusion-tight plastic pipes
in the heating installation, ensure that no
air gets into the heat generator circuit.
Installation and maintenance instructions ecoTEC plus 0020261389_02
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