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INSTALLATION
Installation
11.6 Oxygen diffusion
!
Material losses
Avoid open heating systems and plastic pipes in under-
floor heating systems which are permeable to oxygen.
In underfloor heating systems with plastic pipes that are per-
meable to oxygen and in open vented heating systems, oxygen
diffusion may lead to corrosion on the steel components of the
heating system (e.g. on the indirect coil of the DHW cylinder, on
buffer cylinders, steel heating elements or steel pipes).
!
Material losses
The products of corrosion (e.g. rusty sludge) can settle in
the heating system components and can result in a lower
output or fault shutdowns due to reduced cross-sections.
11.7 Filling the heating system
!
Material losses
Never switch on the power before filling the system.
In the delivered condition, the diverter valve of the MFG is posi-
tioned at the centre, enabling the heating and DHW circuits to be
filled evenly. If power is switched on, the diverter valve automat-
ically moves into the central heating position.
If you intend filling or draining the system later, first place the
diverter valve into its centre position.
For this, activate controller parameter DRAIN HYD in the DIAGNO-
SIS / RELAY TEST SYSTEM menu.
1
D0000036149
1 Drain, heating side
Fill the heating system via the drain.
Water quality
A fill water analysis must be available prior to charging the sys-
tem. This may, for example, be requested from the relevant water
supply utility.
!
Material losses
To avoid damage as a result of scaling, it may be neces-
sary to soften or desalinate the fill water. The fill water
limits specified in chapter "Specification / Data table"
must always be observed.
Recheck these limits 8-12 weeks after commission-
ing and as part of annual system maintenance.
Note
With conductivity of >1000μS/cm, desalination treatment
is recommended in order to avoid corrosion.
Note
Suitable appliances for water softening and desalinating,
as well as for charging and flushing heating systems, can
be obtained via trade suppliers.
Note
If you treat the fill water with inhibitors or additives, the
same limits as for desalination apply.
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