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7.3 Sacrificial
Anode
The sacrificial anode installed in the hot water tank for corrosion protection purposes, must be checked electrically
on a regular basis, at least every two years after commissioning, and be replaced, if necessary. The electrical
check is to be conducted by means of a suitable ammeter without draining the water in the tank.
Procedure:
n
Withdraw PE conductor from tab of sacrificial anode.
o
Connect ammeter (0...50 mA) between PE conductor and tab.
p
Evaluation of wear of sacrificial anode:
Measured value > 1 mA
➪
sacrificial anode is okay.
Measured value < 1 mA
➪
sacrificial anode must be checked or replaced.
If an unambiguous electrical check is not possible, we recommend that a visual inspection of the sacrificial anode
be performed by a qualified expert.
(For a replacement of the sacrificial anode that may be necessary [to be performed by an expert], the water must
be drained from the tank via the drain valve (to be provided upon installation – see appendix.
Caution: Sacrificial anodes that are impaired in their function will reduce the life of the unit!
Fig. 10: Sacrificial anode
(sectional
view
of
tank)
The sacrificial anode is screwed into the storage tank below
the immersion heater
(covered with a plastic cap)
