Hydraulic Installation; Preparing For Installation - Vaillant ECOTEC PLUS VU 80 Installation And Maintenance Instructions Manual

6

Hydraulic installation

6 Hydraulic installation
The work described in this section must only be carried out
by a competent person.
6.1

Preparing for installation

Danger!
a
Risk of personal injury caused by incor-
rect installation!
Heating water that leaks from the drain line
of the expansion relief valve can cause
severe burns.
> Install the expansion relief valve to
ensure that there is no danger to other
persons.
> Route a discharge pipe with inlet funnel
and siphon on the customer side from
the discharge line of the expansion relief
valve to a suitable drain.
> Make sure that the drain is visible.
Any condensate that occurs must only be fed in under con-
sideration of the local regulations regarding neutralisation.
Caution.
b
Risk of material damage caused by con-
taminated lines.
Foreign bodies such as welding remnants,
sealing residue or dirt in the water pipes
may cause damage to the boiler.
> Flush the heating installation thoroughly
prior to installation.
Caution.
b
Risk of damage from corrosion.
If non-diffusion-tight plastic pipes are used
in the heating installation, this may cause
air to enter the heating water and corrosion
of the heat generation circuit and the
boiler.
> If using non-diffusion-tight plastic pipes
in the heating installation, separate the
system by installing an external heat
exchanger between the boiler and the
heating installation.
18
Danger!
a
Risk of scalding and/or damage due to
leaking water.
Stresses in the supply line may cause leaks.
> Make sure there is no voltage in the sup-
ply lines when they are installed.
Caution.
b
Risk of damage caused by incorrect
installation.
Stresses in the supply line may cause leaks.
> Make sure there is no voltage in the sup-
ply lines when they are installed.
Caution.
b
Risk of damage caused by heat transfer
when soldering.
Heat that is transferred during soldering
may cause damage to the seals in the serv-
ice valves.
> Do not solder the connection pieces if
the connection pieces are screwed to the
service valves.
The Vaillant ecoTEC boiler should be connected using a
Vaillant pump group with modulating pumps (available as
an accessory).
This pump group has a connection option for an expansion
vessel (right-hand connection) and an expansion relief valve
(left-hand connection). You can also purchase these as
accessories.
> When installing the pump group, observe the installation
sequence for the insulation and the hydraulic pipes
(¬ pump group installation instructions).
> Note that the boiler pump must always be fitted in the
return line. Otherwise, this may lead to a unit fault.
When connecting several units in cascade operation, you
must install a non-return flap from the cascade connection
set for each individual unit in the unit supply.
A non-return flap from a third-party manufacturer must
have no more than 30 mbar pressure losses for a volume
3
/h.
flow of 4.5 m
ecoTEC plus installation and maintenance instructions 0020134823_01