Gas Supply; Flue Pipe; Standard 125 Mm Flue Pipe; Flue Termination - Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual

Note!
h
If the boiler is to be installed in a timber framed
building, it should be fitted in accordance with
"IGE/UP/7 Edition 2 Gas installations in timber
framed and light steel framed buildings".
3.2.3

Gas supply

The gas supplier should ensure the availability of
sufficient gas volume. A gas meter may only be
connected to the service pipe by the supplier of gas or
their contractor. An existing meter should be checked to
ensure that it is capable of passing the rate of gas
supply required. Installation pipes should be fitted in
accordance with BS 6891. Pipework from the meter to
the boiler must be of an adequate size. Do not use pipes
of a smaller size than the boiler gas connection. The
complete installation must be tested for soundness and
purged as described in BS 6891.
3.3

Flue pipe

Danger!
d
Vaillant appliances are only system-certified if
genuine Vaillant flue pipes are used. Only use
genuine Vaillant flue pipes. Malfunctions can
occur if you use other accessories. These may
result in damage and injury. You will find a list
of genuine flue pipes in the Vaillant installation
manual for flue pipes. The CE mark is valid only
if the appliance is operated with Vaillant flue
pipes.
Only for commercial appliances:
For boiler installations in cascade arrangement using
the appliance type B23p a common non-Vaillant flue
system serving more than one appliance shall be used.
The requirements of the flue installation instructions
must be met.
3.3.1

Standard 125 mm flue pipe

All ecoTEC boilers feature an 80/125 mm diameter air/
flue gas connection as standard. The selection of the
optimum system depends on the individual installation
and application conditions.
A more detailed description can be found in the
accompanying flue pipe installation manual.
For example, you can combine the following air/ flue
gas accesories with your boiler:
Concentric system, plastic, Ø 80/125 mm
• Install the flue pipe using the installation instructions
supplied with this appliance.
Installation and maintenance instructions ecoTEC 0020029173_01
Safety instructions and regulations 3
Fig. 3.1 Item No. 303 209
Fig. 3.2 Item No. 303 200
3.3.2

Flue termination

The following details refer to both flue systems.
a. The terminal must be positioned such that the
products of combustion can disperse freely at all
times.
b. A plume of water vapour will sometimes be visible
from the flue terminal. Positions where this could be
a nuisance should be avoided.
c. If the terminal is fitted less than 2 m above a balcony,
above ground or above a flat roof to which people
have access then a suitable terminal guard must be
provided and fitted (contact Tower Flue Components,
Tonbridge, TN9 1TB).
h Note!
Vertical flues must not terminate within
600 mm of an openable window, air vent or any
other ventilation terminal.
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