Installation; Preparing For Installation; Sample System Installations - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

7

Installation

7.1

Preparing for installation

1. Make sure that the existing gas meter is capable of
passing the rate of gas supply required.
2. Consider the maximum heat output given in DHW
mode.
3. Install the following components:
–
Draining cocks at the lowest points in the heating
installation (→ current version of "BS 2879")
–
A stopcock on the cold water connection
–
A stopcock in the gas pipe
–
A filling/draining device in the heating installation
4. Install the connection pipes such that they are free
from mechanical stress.
5. If you use non-diffusion-tight plastic pipes in the heat-
ing installation, ensure that no air gets into the heat
generator circuit.
6. Only solder connectors if the connectors are not yet
screwed to the service valves.
7. Only bend connection pipes if they have not yet been
connected to the product.
8. Flush the heating installation thoroughly before in-
stalling the product.
9. If, during gas leak-tightness tests, you also place the
gas pipes and the gas valve assembly in the product
under pressure, use a max. test pressure of ≤ 11 kPa
(110 mbar).
10. If you cannot limit the test pressure to 11 kPa
(110 mbar), close any gas stopcocks that are installed
upstream from the product before you carry out the gas
leak-tightness test.
11. If, during gas leak-tightness tests, you have closed the
gas stopcock that is installed upstream of the product,
relieve the gas line pressure before you open this gas
stopcock.
12. If the hydraulic circuit contains a pump other than
the one for the product, only start up the product if a
sufficiently dimensioned low loss header is installed
between the heat generator circuit and the heating
circuit or the cylinder charging circuit.
Low loss header (→ Page 23)
13. If the product's pump is the only circulation pump in
the hydraulic circuit, check whether the product's feed
head is sufficient for the installation. (→ Page 41)
▽
If this is not the case, use an appropriately de-
signed low loss header and circulation pump.
14. With older installations in particular, install a magnetic
filter at the heating circuit return in order to protect the
product against dirt from the installation.
–
Ensure that there is sufficient dimensioning in order
to prevent it from blocking quickly and to prevent
high pressure losses.
15. Use fibre seals. Seals made of rubber-like materials
may be subject to plastic deformation, which can lead
to pressure losses.
20
7.2

Sample system installations

▶
Use the basic installation diagrams as examples.
▶
Select the basic installation diagram based upon which
you want to configure your installation.
▶
Only install the control systems that are listed in the
tables for the basic system diagrams in order to ensure
that all of the system's functions are available.
▶
Establish the connections correctly.
▶
Observe the applicable national and international laws,
standards and directives.
▶
With older installations in particular, install a magnetic
filter at the heating circuit return in order to protect the
product against dirt from the installation.
–
Ensure that there is sufficient dimensioning in order
to prevent it from blocking quickly and to prevent high
pressure losses.
▶
Observe the information on treating heating water.
(→ Page 33)
▽
If you cannot guarantee the conditions for treating
the heating water, install an external plate heat ex-
changer to protect the product.
▶
Install the required safety devices and system compon-
ents in the installation.
7.2.1 Basic system diagram type 1: One direct
heating circuit with one optional domestic
hot water cylinder
Note
This basic diagram type can then only be used if
the product's pump is the only pump in the sys-
tem.
1 Wall-hung boiler with
internal pump
2 Prioritising diverter
valve
▶
To use this basic diagram type, ensure that the product
works within the defined operating ranges. (→ Page 41)
Number for Control
the basic system
diagram
0020253233 Basic control
Installation and maintenance instructions ecoTEC plus 0020261389_03
1
2 3 4
3 Heating circuit
4 Domestic hot water
cylinder
Number Carrying out the
of cir- wiring
cuits
1 See appendix or
contact customer
service for special
basic diagrams.