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Installation
6720813171 (2016/05) 15
8.2 General connection of mains water and gas
components
8.2.1 General
The water and gas connections to the boiler can be made in either of
2ways:
using a pump group ( fig. 12)
•without a pump group.
Fig. 12 Pump group (accessory)
The circulation pump is not factory-installed in the boiler. This pump is
included in the pump group (accessory).
If you do not make use of a pump group, you have to install a separate
circulation pump under the boiler. This pump must be selected so that
the volume flow through the boiler is sufficient to handle the maximum
boiler capacity.
Correct pump selection see chapter 8.2.8 “Selecting and installing the
pump”, page 16.
The pump group has been developed specifically for this boiler and has
already been fitted with the correct pump.
The pump group also includes various fittings, such as service fittings, a
pressure relief valve, a pressure gauge, a gas valve etc. This makes
installing the appliance easier to overcome resistance in the heating
circuit.
Both installation methods are described below.
Decide whether you would like to connect the heating device with or
without a pump group. If you don’t use our pump group, you have to
calculate a separate pump. Make sure, that the pump is large enough,
for the flow to overcome resistance in the heating circuit.
8.2.2 Install the water and gas connections to the boiler using a
pump group (accessory)
The central heating system should be installed in accordance with
BS 6798 and, in addition, for small bore and micro bore systems,
BS 5449 or EN 12823.
The gas installation must be installed in accordance with BS 6891.
Install the pump group on the boiler in accordance with the enclosed
installation instructions.
8.2.3 Install the water and gas connections to the boiler without
a pump group
Connect all pipes making sure that they are not bent or twisted to
cause any stress.
Make sure that the connections are tight and carry out a gas and
water leakage test after completing the connection work.
Installing the gas connection
Fig. 13 Rubber seal
The gas installation must be installed in accordance with BS 6891.
The complete installation must be tested for gas leakage and purged as
described in IGE/UP/1b.
CAUTION:
Do not use galvanised radiators or pipes.
6 720 648 726-012.1TD
CAUTION:
Do not use galvanised radiators or pipes.
DANGER: Danger of fatal accident from explosive
fumes.
Only carry out work on gas pipes and fittings if you
are Gas Safe / ACS registered.
DANGER: Danger of fatal accident from explosive
fumes.
Make sure that the factory-fitted flat rubber seal is
located in the threaded connection (boiler side)
( fig. 13, detailed picture).
CAUTION:
Pipework from the meter to the boiler must be of
adequate size.
NOTICE:
For the installation of the gas valve a gas valve connector
1" [1] is necessary. To order, see address on the back of
this document.
6 720 648 726-013.1TD
15


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