5.4.3 Magnesium corrosion protection anode
The magnesium corrosion protection anode protects the domestic water tank from
corrosion and is therefore depleted over time, depending on the aggressiveness of the
water. It must therefore be replaced at regular intervals, so that the corrosion
protection is retained.
NOTICE! If the magnesium protective anode is not replaced in good time, it can lead
to corrosion in the DHW tank.
❒ Check the magnesium corrosion protection anode initially after 2 years and then
annually in accordance with DIN 4753
❒ Check the magnesium corrosion protection anode with ammeter for wear
❒ Check the magnesium corrosion protection anode during the internal cleaning for
wear after removal of the maintenance flange
⇨ See "Interior cleaning / removing limescale deposits" [page 56]
➥ In the case of wear (loss of material thickness to 1/3 of the original diameter)
the anode must be replaced
Check the magnesium corrosion protection anode with DC measuring device (e.g.
multimeter, anode tester)
❒ Dismantle the cover by undoing the screw
❒ Undo nut on anode head
❒ Remove cable lug on anode head
❒ Install ammeter in series between anode and cable lug of storage tank
➥ measured current greater than 1 mA => protective current sufficiently high, the
anode is not yet consumed
➥ measured current less than 1 mA or equals 0 => remove anode and check for
wear
WARNING! Use a suitable DC measuring device.
NOTICE! Set resolution of measuring range on the ammeter at the beginning to a high
ampere rating in order to protect the device.
NOTICE! Observe the accuracy of the specified measuring range. The result can be
checked again using a second device.
Servicing the system
5
Servicing the DHW tank unit (optional)
Operating Instructions PE1 Pellet 7-35 / PE1 Pellet Unit 7-20 | B1001020_en
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