Removing Or Installing The Front Casing; Installation; Selecting A Low Loss Header - Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual

4.9

Removing or installing the front casing

4.9.1 Removing the front casing
2
1
1. Undo the bolt (1).
2. Push in both retaining clips (2) so that the front casing
is released.
3. Pull the front casing forwards at the bottom edge.
4. Lift the front casing upwards from the bracket.
4.9.2 Installing the front casing
1. Place the front casing on the upper brackets.
2. Push the front casing onto the product until both retain-
ing clips (2) snap into place at the front casing.
3. Secure the front casing by tightening the bolt (1).
5

Installation

Danger!
Risk of explosion or scalding caused by
incorrect installation.
Stresses in the supply line can cause leaks.
▶
Make sure there is no voltage in the sup-
ply lines when they are installed.
Caution.
Risk of damage caused by contaminated
lines.
Foreign bodies, such as welding remnants,
sealing residues or dirt in the water pipes,
may cause damage to the product.
▶
Flush the heating installation thoroughly
prior to installation.
Seals made of rubber-like materials may be subject to plastic
deformation, which can lead to pressure losses. We recom-
mend using seals made of a paste-like fibre material.
0020029173_04 ecoTEC plus Installation and maintenance instructions
You must only start up the product if a sufficiently dimen-
sioned low loss header has been installed between the heat
generation circuit and the heating circuit or cylinder charging
circuit.
5.1

Selecting a low loss header

The low loss header disconnects the heat generator from
the heating system. This means that the system is no longer
dependent on the heat generator's remaining feed head.
In conjunction with the heating pump, the low loss header
ensures that a sufficiently high minimum quantity of water is
always circulating through the heat generator.
Heating system output
Individual unit
Dual cascade
Three-unit cascade
For old systems in particular, we recommend installing a
heating dirt filter in the return to the low loss header (not to
the product). This protects the product against dirt from the
system. Ensure that there is sufficient dimensioning in order
to prevent it from blocking quickly and to prevent high pres-
sure losses.
You do not need any electrical accessories when using a
low loss header. You can connect simple systems directly
inside the electronics box; see the connection diagram
(→ Page 36).
5.1.1 Heating circuit connection with low loss
header
1
1 Product with internal
pump
2 Low loss header
The product can directly operate a heating circuit via the low
loss header.
▶
Downstream of the low loss header, select a heating
pump that is appropriate for the system.
▶
For multi-circuit systems, pay additional attention to the
control system accessories.
The settings for the internal pump are made at the factory.
▶
Connect the external heating pump to the grey ProE plug
X13.
▶
Set the diagnostics code D.26 to 2.
Installation 5
Heating system spread
10 K 15 K 20 K
WH 160 WH 95 WH 95
WH 280 WH 160 WH 95
WH 280 WH 280 WH 160
4
3
2
3 External heating pump
4 Consumer (e.g. heating
circuit)
11