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Fig.6 Lifting aids
AD-0000138-03
4.3 Requirements for water connections
Before installation, check that the connections meet the set
requirements.
Carry out any welding work required at a safe distance from the boiler.
If using synthetic pipes, follow the manufacturer's instructions.
4.3.1 Requirements for the central heating connections
We recommend installing a central heating filter in the return pipe to
prevent clogging of boiler components.
4.3.2 Requirements for the condensate drain
The drain pipe must be Ø 32 mm or larger, terminating in the drain.
Use only plastic material for the discharge pipe due to the acidity (pH 2
to 5) of the condensate.
Fit a watertrap or siphon in the drain pipe.
The drain pipe must slope down at least 30 mm per metre, the maximum
horizontal length is 5 metres.
Do not make a fixed connection in order to prevent an overpressure in
the siphon.
4.3.3 Flushing the system
The installation must be cleaned and flushed in accordance with BS 7593
(2019) and BSRIA BG 33/2014.
Before a new boiler can be connected to a system, the entire system must
be thoroughly cleaned by flushing it. The flushing will remove residue from
the installation process (weld slag, fixing products etc.) and accumulations
of dirt (silt, mud etc.)
Important
Flush the heating system with a volume of water equivalent to at
least three times the volume of the system.
Flush the domestic hot water pipes with at least 20 times the
volume of the pipes.
Important
Due to the presence of an aluminium heat exchanger, suitable
chemicals and the correct use of these chemicals should be
discussed with specialist water treatment companies.
4 Preparation of installation
14 7701838 - v.09 - 10122021
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