16
JUDO i-soft
Operation
5.1.1 Setting the residual hardness
The residual hardness default of the water
softener is set to 8 °e. To change the resid-
ual hardness setting, press the desired key
(see table) for 3 seconds (this can only be
done when in operating mode). The read-
justed residual hardness is shown in the
second line of the display.
The adjustment of the newly set residual
hardness is automatically performed during
system operation. For this purpose, approx.
10 litres of water must pass through the wa-
ter softener (with approx. 500 l/h flow rate).
Residual hardness can be checked using an
optional hardness measuring equipment
(see chapter “Accessories”).
The test water for checking water hardness
may be taken from the bypass valve or from
any water tap downstream of the water
softener.
Ensure that the readjusted mixed water is
supplied from the water softener to the tap-
ping point.
For a correct comparison of measured
values, the samples should be taken at nor-
mal flow rate (when the tap is fully open).
During sampling, no larger amount of water
may be taken from another tapping point.
5.1.2 Limitations for residual
hardness settings
Residual hardness can only be set to a
maximum of 10 °e.
The water softener control unit checks relia-
bility of the residual hardness settings.
At a maximum, residual hardness must be
about half the value of raw water hardness.
Higher residual hardness can not be
achieved using the blending valve.
If you try to enter higher values via the key-
pad, the display indicates the following:
After 5 seconds, the next possible setup
value is shown (e. g. 8 °e):
This is adopted as the setting value.
The softening increases the sodium concen-
tration in the mixed water, depending on the
raw water hardness and the mixed water
hardness set.
In Germany in accordance with the drinking
water regulations of Jan 1
rst
2003 the limit
value for sodium in drinking water is 200 mg/
l. This does not apply to mineral and table
water. Their limit values are considerably
higher, some have values above 1000 mg of
sodium per litre. Values may vary in other
countries, please consult your local regula-
tions.
Fig. 11:
Display and foil keypad
Key
Residual hardness
1
1 °e
2
2 °e
4
4 °e
6
6 °e
8
8 °e
10
10 °e
Display
Keypad
Input not
possible
Max. possible
res. hard. 8 °e
