Vaillant ecoTEC plus VU GB 656/4-5 A - 5.3 Pipework Connections

Installation 5
0020214491_01 ecoTEC plus Installation and maintenance instructions 13
5.2.3 Checking the gas line for leak-tightness
▶ Check the entire gas line properly for leak-tightness.
5.3 Hydraulics installation
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.
Caution.
Risk of material damage due to heat trans-
fer during soldering.
Heat that is transferred during soldering may
cause damage to the seals in the service
valves.
▶ Do not solder the connection pieces if
the connection pieces are screwed to the
service valves.
▶ If you are using plastic pipes in the heating installation,
you must install a suitable limit thermostat on-site at the
heating flow. The limit thermostat is required to protect
the heating installation against temperature-related dam-
age if a fault occurs.
▶ Install an expansion vessel on-site in the heating return,
as close to the product as possible.
5.3.1 Connecting the heating flow and heating
return
21
1. Install service valves properly at the flow connection (1)
and the return connection (2).
2. Establish the heating connections in accordance with
the relevant standards.
5.3.2 Installing the expansion relief valve
1
1. Install the enclosed expansion relief valve.
2. Lay as short a drain line as possible for the expansion
relief valve, at a downward gradient.
3. Terminate the drain line in such a way that escaping
water or steam cannot cause injury to persons or dam-
age to electronic components.
4. Make sure that the line end is visible.
5.3.3 Connecting the condensate drain pipework
5.3.4 Connecting the condensate drain pipework
Danger!
Risk of death from escaping flue gases!
The condensate drain pipework of the con-
densate trap must not be connected tightly to
waste-water piping because, otherwise, the
internal condensate trap may be drained fully
and flue gas may escape.
▶ Do not connect the condensate drain
pipework tightly to the waste-water pip-
ing.
1
2
Condensate forms in the product during combustion. The
condensate drain pipework (1) routes the condensate to the
waste water connection via a tundish (2).