Removing/Attaching The Front Casing; Installation 5; Selection Of The Low Loss Header; Required - Vaillant ecoTEC VU 466/4 Installation And Maintenance Instructions Manual

4.8

Removing/attaching the front casing

2
1
Fig. 4.5 Removing the front casing
To dismount the front casing of the boiler, proceed as
follows:
• Unfasten the screw (1) on the bottom of the boiler.
• Push in both retaining clips (2) on the bottom of the
boiler so that the front casing is released.
• Pull the casing forwards by its bottom edge and lift
the casing up and off.
To mount the front casing of the boiler, proceed
as follows:
• Place the casing thus on the upper boiler edge that
casing and boiler edges engage.
• Push the casing onto the boiler so that both retaining
clips (2) engage with the casing.
• Fix the casing by tightening the screw (1) on the
bottom of the boiler.
Installation and maintenance instructions ecoTEC 0020029172_03
5 Installation
d Danger!
Danger of injury to persons and/or material
damage due to improper installation!
The Vaillant ecoTEC boiler may only be
installed by a recognised skilled trade company.
who also assumes the responsibility for proper
installing and initial start-up of the boiler.
Caution!
a
The ecoTEC VU 466 must be used with a
suitably sized low loss header.

Selection of the low loss header

The low loss header uncouples the boiler from the
heating installation. A sufficiently large water volume is
constantly supplied through the boiler via the low loss
header in conjunction with the boiler circulation pump.
It acts as a neutral point in the system and has minimal
hydraulic resistance, therefore the boiler circulation
pump does not affect the circuit pumps and vice-versa.
A suitable WH type low loss header can be chosen from
Table 5.1.
Output of heating 10 K
installation
Stand-alone boiler WH 95
Two cascade WH 160
arrangement
Three cascade WH 280
arrangement
Four cascade WH 280
arrangement
Table 5.1 Selection of the low loss header
h Note!
We strongly recommend the installation of a
suitably sized quality dirt filter in the return
pipe work to the low loss header (not to the
boiler!) particularly in the case of old systems.
This will help to prevent any system water
contamination from entering and blocking the
boiler and producing an additional high pressure
loss.
No electrical accessories are required in order to use a
low loss header. Simple systems can be connected
directly inside the electronic box.
Assembly 4

Installation 5

Temperature spread of
heating installation
15 K 20 K
WH 40 WH 40
WH 95 WH 95
WH 160 WH 160
WH 160 WH 160
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