Miele Dishwasher Care And Maintenance - Page 31

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Both paths flow past each other separated by two thin stainless-steel foils,

which act as condensation surfaces.

The steam condenser in the machine side wall has cool ambient air passed

over it which speeds up the cooling of the moist warm air from the cabinet.

This has the advantage that even with connection to a hot water supply, the

drying performance is not impaired.

4.5 Water softening and reactivation

Calcareous deposits in the cabinet and on the load, stained glasses and

generally poor cleaning results would be the result of using a dishwasher

without softened water. Therefore, every modern dishwasher has a water

softener with special amber-colored grains of artificial resin. This resin (if the

softener is activated and regularly filled with reactivation salt) is loaded with

sodium ions. When hard water flows through the softener, calcium and

magnesium ions in it are retained and exchanged for sodium ions and

hence a supply of soft water for the wash program is gained. In this way the

hardness-creating calcium and magnesium bicarbonates are replaced by

sodium carbonate.

Depending on the on-site water hardness and the quantity of water passed

through the water softener, the ion exchanger resin sodium ion content is

exhausted more or less rapidly. As soon as all usable sodium ions have

been replaced by calcium and magnesium ions, the ion exchanger can no

longer supply any soft water. For this reason a concentrated sodium

chloride solution (reactivation salt dissolved in water) must regularly be

passed into the softener. This process is known as reactivation. The calcium

and magnesium ions in the softener resin are then again replaced by

sodium ions. Following this, the released calcium and magnesium ions are

flushed out with the excess brine no longer required for the ion exchange

process.

Warning!

Only special reactivation salt may be used when reactivating the water

softener. Other types such as table salt, cattle salt or rock salt must not be

used as they may contain insoluble matter, which could affect correct

operation of the softener.

For further information regarding reactivation salt, see 2.3 Reactivation salt.

Note

With widely varying water hardness levels (e.g. 8 – 17 gr/gal), the highest

value must always be set (here 17 gr/gal).

Technical Information