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Design information
The use of permeable components, e.g. permeable plastic pipes in
underfloor heating systems, should be avoided. Provide system sep-
aration if such components are nevertheless used. This must separate
the water flowing through the plastic pipes from other heating circuits,
8
e.g. from the heat source, by the provision of a heat exchanger made
of corrosion-resistant material.
No further anti-corrosion measures are required for sealed unvented
hot water heating systems subject to the above points being
observed.
However, take additional precautions where there is a risk of oxygen
ingress, for example by adding oxygen binder sodium sulphite
(5 - 10 mg/litre into the excess). The pH value of the heating water
should be between 9.0 and 10.5.
Application examples
48
(cont.)
Different conditions apply to systems that contain aluminium compo-
nents.
Where chemicals are used as part of the corrosion protection, we rec-
ommend that the manufacturer of the chemicals issues a certificate of
suitability of the additives with regard to the boiler materials and the
materials of the other heating system components.
We recommend you refer questions about water treatment to
Viessmann industrial services or an appropriate specialist.
Further details can be found in VDI Directive 2035-2 and EN 14868.
a: In Austria, detailed information can be found in the
ÖNORM H 5195-1: Heat exchanger for domestic systems, part 1
PYROMAT ECO
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