Installation; Checking The Gas Meter; Gas And Water Connections - Vaillant ecoFIT sustain 825 Installation And Maintenance Instructions Manual

5 Installation

4.10.2 Installing the side section
Refit the components in the reverse order.
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5 Installation
Danger!
Risk of scalding and/or damage due to
incorrect installation leading to escaping
water.
Mechanical stresses in the connection pipes
may lead to leaks.
Ensure that there is no mechanical stress
▶
when installing the connection pipes.
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.
5.1

Checking the gas meter

Make sure that the existing gas meter is capable of
▶
passing the rate of gas supply required.
5.2

Gas and water connections

Caution.
Risk of damage caused by incorrect gas
installation.
Excess test pressure or operating pres-
sure may cause damage to the gas valve
assembly.
Check the leak-tightness of the gas valve
▶
assembly using a maximum pressure of
11 kPa (110 mbar).
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.
10
Caution.
Risk of material damage due to heat trans-
fer during soldering.
Only solder connectors if the connectors
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are not yet screwed to the service valves.
Warning.
Risk of adverse health effects caused by
impurities in the potable water.
Sealing residues, dirt or other residues in the
pipelines may adversely affect the quality of
the potable water.
Flush all of the hot and cold water pipes
▶
thoroughly before you install 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
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not yet been connected to the product.
Note
We recommend that you provide the water pipes
to the floor-standing boiler outlet and to the install-
ation with heat insulation.
Preliminary work
1. Install a system separator (to be provided on-site) directly
on the cold water connection for the combi boiler.
2. Check that the system volume and the volumetric capa-
city of the expansion vessel are the same.
If the volume of the expansion vessel is insufficient
▽
for the installation.
Install an additional expansion vessel in the heat-
▶
ing return, as close to the product as possible.
Install a non-return flap at the product's outlet
▶
(heating flow).
3. Ensure that the installation has the following compon-
ents:
Working materials
A stopcock on the cold water connection
A stopcock in the gas pipe
A filling/draining device in the heating installation
Installation and maintenance instructions ecoFIT sustain 0020230529_04