Checking The Magnesium Anode; Testing With The Anode Tester; Visual Check; Replacing The Magnesium Anode - Buderus Logalux Installation And Maintenance Instructions Manual

9
Maintenance
9.3

Checking the magnesium anode

The magnesium anode is a sacrificial anode which is consumed during
operation of the DHW tank.
If the magnesium anode is not serviced properly, the
warranty is void.
Annual service records must be kept in a safe location
and submitted together with the original purchase
receipt in the event of a warranty claim.
To determine whether the magnesium anode must be replaced:
▶ Check the magnesium anode annually.
The surface of the magnesium anode must be free of deposits. The
magnesium anode must be replaced when:
• Deposits have formed
• The surface area has increased as the result of deposits
• Diameter is reduced to < 5/8" (15 mm)
Certain installations may require more frequent replacement of the
magnesium anode rod:
• Recirculation connection
• Poor water quality
• Galvanic/electrolytic corrosion
• High flow rate
In the event of poor water quality it is recommended that a water
treatment professional be consulted for water treatment options.
Never bring the magnesium anode surface in contact
with oil or grease.
▶ Keep everything clean.
9.3.1

Testing with the anode tester

We recommend that the protection current be measured annually with
the aid of an anode tester. The anode tester is available as an accessory.
Follow the operating instructions for the anode tester.
Insulated installation of the magnesium anode is a prerequisite for use of
an anode tester to measure the protection current ( Fig. 18).
The protection current can be measured only with a water-filled storage
tank.
▶ Ensure proper contact of the connecting terminals.
▶ Connect terminals to shiny metal surfaces only.
▶ Loosen the ground wire [6] (contact cable between the sacrificial
anode and storage tank) at one of the two connection points.
▶ Attach red cable [1] to the sacrificial anode.
▶ Attach black cable [7] to the storage tank.
▶ If the ground wire has a plug: Attach red cable [1] to the threads of
the magnesium anode [5]. Remove the ground wire [6] for the
measurement.
▶ Replace magnesium anode if the anode current is < 0.3 mA.
▶ After every test, it is essential that the ground wire [6] always be
reattached properly.
16
mA 7
6
5
4
Fig. 18 Measuring the anode current
[1] Red cable
[2] Screw for ground wire
[3] Handhole cover
[4] Magnesium anode
[5] Thread
[6] Ground wire
[7] Black cable
9.3.2

Visual check

Never bring the magnesium anode surface into contact
with oil or grease.
▶ Keep everything clean.
▶ Prepare the DHW tank for removal of the handhole cover
( Chapter 9.1, page 15).
▶ Remove the handhole cover ( Fig. 16, page 15).
▶ Check the magnesium anode.
If the diameter is reduced to < 5/8" (15 mm):
▶ Replace the magnesium anode.
9.3.3

Replacing the magnesium anode

▶ Unscrew the M8 nut ( Fig. 19 [1]) to release the eyelet of the
ground wire [3].
▶ Unscrew the M8 nut [4].
▶ Remove the magnesium anode [10] from the handhole cover [8].
▶ Replace the magnesium anode.
▶ Fit the new magnesium anode together with all small parts supplied
with it as shown in Fig. 19.
Logalux LT160/1 | LT200/1 | LT300/1 – 6 720 811 745 (2021/10)
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6 720 804 390-01.1ITL