JUDO QUICKSOFT-DUO
15
Operation
5.1.2 Setting the blending
In the factory the setting screw of the
blending valve (
10
) is set to the "SOFT"
position. You first have to check what the
mixed water hardness is with this setting.
The water hardness is measured using
measuring equipment (see chapter “Acces-
sories”).
The sample water for measurement and
adjustment of the water hardness can be
drawn off at the bypass valve (see “Acces-
sories” chapter) or at a water tap down-
stream of the softener.
Ensure that the readjusted mixed water has
reached the drawing off point from the
softener. To correctly compare the meas-
ured values, the samples should be taken
from a normal water flow (1 tap fully
opened). During the drawing off no large
water quantities may be drawn off at any
other point.
If the required mixed water hardness has
still not been reached, it can be achieved by
turning the blending (
10
). Recommended
hardness is approx. 10°e.
The setting may have to be changed and
remeasured several times before the
required value is reached.
The softening increases the sodium concen-
tration in the mixed water, depending on the
raw water hardness and the mixed water
hardness set.
In accordance with the current drinking
water regulations 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.
If the calculated total sodium content
exceeds the value permitted under the drin-
king water regulations of 200 mg/l, it can be
corrected by increasing the mixed water
hardness accordingly. The sodium content
must be recalculated.
Softer
mixed water
=
turn in clockwise
direction
Harder
mixed water
=
turn in anti-clock-
wise direction
Calculating the sodium content
°e
Raw water hardness (ask the
waterworks or measure with a
hardness test device)
-
°e
Mixed water hardness (meas-
ured value)
= °e Water
hardness
x 6.4 mg Na
+
/l x °e
exchange value for sodium ions
= mg/l
Increase in sodium content due
to softening
+ mg/l
Sodium already in the raw water
(ask the waterworks)
= mg/l
Total sodium content in mixed
water
Tab. 1: Calculating the sodium content
Example calculation of the sodium
content
25
°e Raw
water
hardness
- 10
°e Mixed
water
hardness
= 15
°e Water
hardness
x 6.4
= 96
mg/l
Due to softening
+ 10
mg/l From
waterworks
= 106
mg/l Total
Tab. 2: Example calculation of the sodium content
