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installation
maintenance
15. maintenance
DANGER Electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
WARNING Electrocution
Before any work on the appliance, disconnect all poles
of the appliance from the power supply.
If you need to drain the appliance, observe chapter "Draining the
appliance".
15.1 checking the safety valve
f Regularly vent the safety valve on the safety assembly until a
f
full water jet is discharged.
15.2 draining the appliance
DANGER Scalding
Hot water may escape during draining.
If the appliance needs to be drained for maintenance or to protect
the whole installation when there is a risk of frost, proceed as
follows:
f Close the shut-off valve in the cold water line.
f
f Open the hot water taps on all draw-off points.
f
f Drain the appliance using the drain valve.
f
15.3 checking / replacing the protective anode
f Check the protective anode after the first two years of use
f
and replace if necessary. Check that the maximum transition
resistance between the protective anode and the cylinder is
0.3 Ω. If it is not possible to insert a rod anode from above,
install a segmented anode.
f Decide the time intervals at which further checks should be
f
carried out.
removing the protective anode
f Open the zip fastener in the cylinder casing.
f
f Cut away the thermal insulation where you can detect the
f
protrusion.
15.4 descaling the heating elements
f Never use descaling pumps.
f
f Only descale the flanged immersion heater after dismantling
f
and never treat the cylinder surface or protective anode with
descaling agents.
Torque of the flange screws: see chapter "Specification / Dimen-
sions and connections".
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15.5 replacing the heating elements
6
5
4
3
1 Insulation plate
2 Pressure plate
3 Soldered flange
4 Insulating plate
5 Corrosion resistor 390 Ω
6 Gasket
f Ensure the heating elements are electrically isolated when
f
installing them in the flange plate.
The corrosion resistor acts to balance the potential and prevents
power leakage corrosion on the heating elements.
f Never damage or remove the corrosion resistor during
f
maintenance.
f After replacing the corrosion resistor, reassemble the flanged
f
immersion heater correctly.
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