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INSTALLATIoN
Maintenance
14. Maintenance
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
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".
14.1 Checking the safety valve
f Check the safety valve regularly.
f
14.2 Draining the appliance
WARNING Burns
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 inlet line.
f
f Open the DHW valves of all draw-off points until the appli-
f
ance is fully drained.
f Drain any residual water from the safety valve.
f
14.3 Checking / replacing the protective anode
f Check the protective anode after the first year of use and re-
f
place if necessary.
f Next, decide the time intervals at which further checks
f
should be carried out.
14.4 Descaling
f Remove loose scale deposits from the water heater.
f
f If necessary, descale the inner cylinder with commercially
f
available descaling agents.
f Descale the flange only after removal.
f
f Never treat the cylinder surface or the protective anode with
f
descaling agents.
72
| PSH Classic
14.5 Anti-corrosion protection
Ensure that while carrying out maintenance work the anti-corro-
sion protection (560 Ω) is not damaged or removed. Reinsert the
anti-corrosion protection correctly after replacement.
14.6 Replacing the combined controller/limiter
1
1 Controller sensor
2 Limiter sensor
f Insert the controller sensor and the limiter sensor into the
f
sensor well as far as they will go.
2
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