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14. maintenance
DANGER Electrocution
Before any work on the appliance, disconnect all poles
of the appliance from the power supply.
DANGER Electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
If you additionally need to drain the appliance, observe chapter
"Draining the appliance".
14.1 checking the safety assembly and safety valve
f Check the safety assembly and safety valve regularly.
14.2 draining the appliance
DANGER Scalding
Hot water may escape during the draining process.
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 Open the hot water taps on all draw-off points.
1 Drain valve cap
f Undo the cap of the drain valve.
14.3 checking the protective anode
f Check the protective anode after the first year of use and re-
place if necessary.
f Afterwards determine the time intervals at which further
checks should be carried out.
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| PSH UniverSal el
14.4 descaling
f Remove loose scale deposits from the water heater.
f If necessary, descale the inner cylinder with commercially
available descaling agents.
f Only descale the flange after disassembly and never treat the
cylinder surface and protective anode with descaling agents.
14.5 installing the temperature limiter
1 Limiter sensor
f Insert the limiter sensor into the sensor well as far as it will
go.
14.6 replacing the heating element
The heating element is located inside a protective pipe. This ena-
bles a "dry" replacement of the heating element. The appliance
does not need to be drained when replacing the heating elements.
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1 Ceramic heating element in protective enamelled pipe
2 Heating element fixture
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