- 31 - V08 en, SCC
CDS sensor (S11) is only existing in SCC units and monitors the water ow through
solenoid valves Y1, Y3 and Y4.
1.Basics
During steam production the concentration of minerals in the water of the steam
generator increases.
These minerals deposit in the steam generator and build up scale.
The build up of scale is inuenced by the local water hardness and the individual usage of the
unit. The SCC unit continuously calculates the scale amount inside the steam generator.
This value is also used for calculating the number of indicated rinse tabs in CareControl.
2. Function description
At the end of the SC-Automatic the steam generator will be lled. Solenoid valve Y1 opens and water ows into
the steam generator via the CDS sensor. During this lling phase S11 (CDS Sensor) creates pulses (1000 Pulses =
1l). When the water reaches the level electrode S2, the lling will be stopped and the measured number
of pulses are stored. The unit specic nominal lling volume is stored in the CPU and will be compared with the
actual lling volume (calculated from the pulses).
The higher the dierence between nominal- and actual lling volume, the more scale has built up in the steam
generator and therefore also the number of indicated bars in the Care display increases.
When cleaning the unit regularly as requested, using the „CARE“ tabs the built up of scale in
the steam generator will be avoided and the CDS pulses remain constant.
In case the CDS sensor is defective a „Service 12“ is shown.
In case the CDS sensor is measuring a higher volume than normal a „Service 11“ is shown.
Please refer to fault tree!
SCC: use Rinse/Dump steam Generator to clear aer repair
CMP: use ESG from Prog/Start mode to clear aer repair
CDS - SCC
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