78 GV 640 Service Manual
For internal use only
8.3 Water softening equipment
The softening equipment (ion exchanger) is a container filled with fine-grained synthetic resin granules.
This synthetic resin replaces calcium and magnesium ions in the water with sodium ions on the surface.
1 Ion exchanger
2 Water inlet
3 Water drain
4 Regeneration valve
5 Salt box cover
6 Salt box
7 Salt refill sensor
Capacity:
Fine-grained salt approx. 1.3 kg
Coarse-grained salt approx. 0.9 kg
8.3.1 Softening
The incoming water with its hardness constituents is conveyed via the
synthetic resin. Calcium and magnesium are bonded to the surface of
the exchange compound while sodium ions are released into the wa-
ter. When all the sodium ions have been replaced with ions of the hard-
ness constituents, the capacity of the water softening system is
exhausted and it must be regenerated.
1 Synthetic resin
8.3.2 Regeneration
In order to restore the ability to work of the ion exchanger, a concen-
trated salt solution (sodium chloride) is led from the salt box through
the softening equipment. The great concentration makes the sodium
ions force the calcium and magnesium ions from the salt solution and
they are then once again deposited on the exchanger body. The ion
exchanger is now once again “loaded” (regenerated) and ready for op-
eration.
1 Synthetic resin
Regeneration cycle
The regeneration cycle is regulated by the electronics unit in dependence of the water hardness setting
and the water quantity that is identified.
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