Descale - Miele PTD 901 Betriebsanleitung

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English 4 Software

4.2.7 Descale

If the warewasher is operated with hard water and without water treatment, then the boiler, the interior of the machine, all the water
lines and components may develop scale. Limescale deposits and dirt that remain in the machine can contribute towards hygiene risks,
while scaling can lead to failure of heating elements. In case of limescale deposits, the warewasher must be descaled.
The interior of the warewasher can be descaled using the descaling programme (} page 58). We recommend running the descaling
programme at the end of the working day, as the machine's tank is emptied when the programme starts and ends.
The water lines and the boiler can only be descaled by an authorised service technician.
For descaling, you require an acid-based descaler suitable for commercial warewashers.
Warning
Risk of chemical burn due to contact with descaler
Contact between descaler and the skin or eyes can lead to severe burns or serious eye damage.
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Wear protective clothing, protective gloves and protective goggles.
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Observe the danger and safety notes on the canister and safety data sheet.
Warning
Danger of chlorine gas developing
Mixing active chlorine cleaner and acid-based descaler produces chlorine gas. Contact with chlorine gas leads to eye,
nose and throat irritations.
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Do not mix active chlorine cleaner and acid-based descaler.
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Ensure good ventilation when you descale the warewasher.
Note
Danger of corrosion due to descaler solution
Descaler solution has a corrosive effect when in contact with metals and plastics for a long time and therefore must not
remain in the interior of the machine (e.g. overnight).
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Do not cancel the descaling programme and follow the instructions on the display.
Starting the descaling programme
When adding the descaler, observe the tank volume and dosing recommendation.
Item Name
1 Cancel descaling programme (possible as long as no descaler has been added)
2 Repeat descaling programme
3 End descaling programme
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Operating instructions