7.1 Descaling
Depending on the degree of hardness of the tap water, the water still must be cleaned
regularly of scale formations. First remove the inner and outer lids, then unscrew the
deflector and remove it, too.
A suitable descaling agent is a mixture of 10% formic acid, 10% acetic acid and 80% distilled
water. Commercial descaling agents can also be used (e g "tin-be" by Messrs Dr Otto
Hartmann, 71665 Vaihingen/Enz, Germany). Please do not use any products containing
hydrochloric acid!
Fill the solvent into the boiler to cover the topmost scale formations and heat up to approx
70°C. Close valves (7 + 8) and switch the water still on until the temperature is reached.
After approx 30 minutes let the solvent and scale mixture drain off through the drain cock
"drain boiler (4)" and rinse the boiler with water several times.
Restart the unit as described in 5. Initiation.
After descalings, the first few litres of distilled water should not be used as it might contain
traces of evaporated descaling agent.
7.2 Pilot lamp Clean
Depending on the degree of impurities in the inflowing water and on the degree of impurities
in the boiler caused by the distillation process, the water will foam up when boiling. If the
foam gets into contact with the electrode in the boiler, an electronic impurity detector will
switch off the unit and the red pilot lamp Clean will glow.
The boiler must be drained through the tap "drain boiler" (4) and rinsed with clear water
several times.
The cut-off function Clean is cleared by switching the unit off and on again using the main
switch.
Restart the unit as described in 5. Initiation.
7.3 Restarting after low water
A low water cut-off (thermostatic over-temperature cut-out) protects the heating elements
against running dry.
In case of low water the water still is switched off by the low water cut-off. In order to restart
the unit, the unit must be allowed to cool down. Then fill in water to cover the heating
elements as described in 5. Initiation.
The triggered low water cut-off has to be
released. Loosen the black cap nut at the
bottom right-hand side of the water still.
Inside the thread a small white plastic pin can
be seen that has to be pressed inside (eg
with a pencil), until a clicking sound can be
heard.
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