Installing The Gas Connection; Checking The Gas Line For Leak-Tightness; Installing The Cylinder Connections; Connecting The Heating Flow And Heating Return - Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

5.2

Installing the gas connection

1. Install the gas line in accordance with the recognised
rules of technology.
2. Connect the product to the gas line in accordance with
the recognised rules of technology.
3. Remove the residues from the gas line by blowing
through the gas line beforehand.
4. Purge the gas line before start-up.
5.3

Checking the gas line for leak-tightness

▶
Check the entire gas line properly for leak-tightness.
5.4

Installing the cylinder connections

▶
Connect the cylinder connections (1) to the domestic hot
water cylinder.
–
For this purpose, you can use an optional cylinder
connection set.
5.5 Connecting the heating flow and heating
return
▶
Establish the heating connections (1) in accordance with
the relevant standards.
0020193966_01 ecoTEC exclusive Installation and maintenance instructions
5.6
1
The product is equipped with a condensate trap (2). (The
filling height is 145 mm). The condensate trap collects the
condensate that has formed in a vessel with a capacity of
approximately 200 ml, and intermittently releases the con-
tents into the discharge pipe. This minimises the risk of the
discharge pipe freezing.
▶
Connect the condensate discharge (1) to a condensate
discharge pipe (3) that has a minimum internal diameter
of 19 mm (30 mm internal diameter for all externally in-
stalled lines) and is made from an acid-resistant material
(e.g. plastic overflow pipe).
–
1
▶
During installation remove all burs from inside of cut pipe
work and avoid excessive adhesive which may trap small
pockets of water close to the pipe wall which can freeze
and build into a larger ice plug.
▶
As with other pipe work insulate the condensate dis-
charge pipe to minimise any risk of freezing and beware
when crossing cavities that the fall is maintained and the
pipe sleeved.

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.
The condensate discharge pipework must have
a continuous fall (45 mm per metre) and should
whenever possible terminate at a suitable discharge
point within the heated envelope of the building
that will remain frost free under long periods of low
external temperatures.
Installation 5
1
2
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