6.4.2
Inspection
1. Remove the inspection hatches.
Important
Descale the DHW tank if necessary.
2. Measure the diameter of the anode.
Replace the anode if its diameter is less than 15 mm.
3. Reassemble the anode/inspection hatch unit.
6.5
Removing limescale
In hard water regions, annual descaling of the appliance is recommended
in order to maintain its performance.
1. Remove the inspection hatches.
2. Check the magnesium anode each time the hatch is opened.
3. Remove limescale deposits in the form of sludge or strips from the
bottom of the tank. However, do not touch the limescale adhering to
the walls of the tank as it provides effective protection against
corrosion and improves the insulation of the domestic hot water tank.
4. Remove limescale deposits from the exchanger to guarantee its
performance.
5. Remount the unit.
For more information, see
Remove the inspection hatches, page 22
Checking the magnesium anode, page 21
Putting the inspection hatches back in place, page 23
6.6
Removing and remounting the inspection hatches
Caution
To guarantee tightness, the gasket unit must be replaced each
time the hatch is opened.
Have a new lip gasket and a new retainer ring on hand for the
inspection hatch.
Use a new gasket for the side inspection hatch.
6.6.1
Remove the inspection hatches
1. Shut off the domestic cold water inlet.
2. Drain the tank.
Important
The domestic cold water inlet is also the drain opening.
3. Remove the inspection hatches.
Fig.12
Ø >
15 mm =
Ø <
15 mm =
MW-C003699-4
7
6 Maintenance
22
AS 300–2E BC
7724479 - v03 - 07102019
