OPERATING AND INSTALLATION MANUAL HEAT PUMP COMBI UNIT PKOM4 PAGE 43
USER
GENERALSPECIALIST PERSONNEL
15.7 CHECK AND CLEANING SERVICE
WATER TANK -
SACRIFICIAL ANODE
The magnesium anode as cathodic cor-
rosion protection constitutes a means of
minimum protection for potential flaws in
enamelling processes in compliance with
DIN 4753. It protects the hot water tank
against corrosion. A used up magnesium
anode may cause premature corrosion
damage. If the anode is used up by more
than 2/3, it must be replaced immediately.
An initial inspection should be performed
after two years of operations at the latest,
then annually.
The condition of the magnesium protec-
tion anode can be determined in the built.
in state and with a filled tank by measuring
the protective current. For this purpose, the
grounding cable at the tank must be loos-
ened and the protective current is meas-
ured using an anode tester or ammeter. If
the protective current is lower than 0.3 mA,
the anode must be removed and check for
material loss.
After the measurement it is
essential that the grounding cable
is mounted to the tank again. The
drinking water must have a minimum con-
ductance of 100 μS/cm. When carrying out
the replacement, present electrical connec-
tions must be considered.
Magnesium anode
Electrical heating
element with safety
temperature limiter
(92 °C)
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