REMKO EWS300 - Manual (Page 9)

9
The potential equalisation of the piping
must take place in accordance with DIN
50927.
This type of corrosion results in
the formation of corrosion cells.
Voltage is present in corrosion cells
between the anode and cathode area.
The processes are dependent on one
another, however, their separation from
one another can vary greatly.
Corrosion cells can appear as a result
of different potentials, as the case is with
contact corrosion. Different metals are
in conductive contact with one another
through an ion-conducting medium
(water).
All metal plug-in (built-in) components
with large metal surfaces (e.g. condenser
plug-in heat pumps, fin-tube heat
exchangers, electric heaters) must be
electrically insulated from the tank.
For the protection of the above-
mentioned plug-in (built-in) components
against the current-induced corrosion,
we recommend installing a defined
contact resistance of approx. 600 Ohm
(insofar as it has not already been
installed in the components at the
factory).
■ The hot water tanks may not be
transported with the fin-tube heat
exchanger installed.
■ The unit must be assembled on site.
■ For all connecting sockets, ensure
that the thread is fully engaged.
■ When installing a fin-tube heat
exchanger it must be absolutely
ensured that the corrosion protection
in the tank remains intact. Therefore,
an appropriate external current
anode or magnesium anode must be
installed if the magnesium anode is
removed with the flange plate from
the tank.