Setting The Hardness Of Blended Water - BWT Rondomat Duo-DVGW 2 Einbau- Und Bedienungsanleitung

Example: Example: Example: Example: Example:
24°d Hardness of untreated water
- 8°d Hardness of blended water
——————————————————
= 16 °d Reduction in hardness of untreated water
16 °d x 8.2mg/l = 131.2 mg/l increase in the sodium content.
10 mg/l Sodium content of untreated water
+131.2 mg/l Increase in sodium content
+ 5 mg/l Increase due to metering
——————————————————
=146.2 mg/l Sodium content of partially softened water.
Preparing the brine Preparing the brine
Preparing the brine Preparing the brine Preparing the brine
All commercially available regenerative salts conforming to EN 973
can be used (in loose or tablet form).
Unscrew the lid (7 7 7 7 7 ) of the salt/brine container (6 6 6 6 6 ) and remove. Fill the
regenerative to a filling height of 250–350 mm (see Technical
specifications). The brine cavity automatically fills with water during
the "disinfection" stage. Wait and then check that the automatic water
refilling turns off as soon as the water has risen above the sieve base.
Pour in the regenerative (always adding whole units) up to a maximum
of 75–150 kg. Close the cover and lock it.
Note: Allow hours for the brine to form, unless large immediate water Note: Allow hours for the brine to form, unless large immediate water Note: Allow hours for the brine to form, unless large immediate water Note: Allow hours for the brine to form, unless large immediate water Note: Allow hours for the brine to form, unless large immediate water
consumption is expected (e.g. filling a swimming pool). consumption is expected (e.g. filling a swimming pool). consumption is expected (e.g. filling a swimming pool). consumption is expected (e.g. filling a swimming pool). consumption is expected (e.g. filling a swimming pool).
Duo 2 and 3 only Duo 2 and 3 only Duo 2 and 3 only Duo 2 and 3 only Duo 2 and 3 only
During installation, it is possible to initiate a water
refilling process manually to supplement the auto-
matic process. Do this by pressing the button in
recess D D D D D for 3 seconds. Filling will continue
automatically.
D D D D D

Setting the hardness of blended water

Setting the hardness of blended water Setting the hardness of blended water Setting the hardness of blended water Setting the hardness of blended water
For Duo 2 and 3 For Duo 2 and 3 For Duo 2 and 3 For Duo 2 and 3 For Duo 2 and 3, shut the adjusting spindles (14+15
in a clockwise direction and then set the optimal blended water
hardness of 8 °d (only use an AQUATEST hardness tester to set,
check and correct hardness), ensuring that each spindle is opened
by the same amount.
For Duo 6 and 10 For Duo 6 and 10 For Duo 6 and 10, shut both adjusting spindles (14+15 For Duo 6 and 10 For Duo 6 and 10
them in a clockwise direction. Open the large spindle until the hardness
of the blended water equals approximately 8 °d. Fine adjust the
hardness of the blended water using the small spindle (black turning
knob). The small spindle should never be opened completely, since
only untreated water could be drawn via this opening in the case of
limited water use. (Only use an AQUATEST hardness tester to set,
check and correct hardness.)
Drinking water regulations stipulate a sodium limit of 200 mg/l. This Drinking water regulations stipulate a sodium limit of 200 mg/l. This Drinking water regulations stipulate a sodium limit of 200 mg/l. This Drinking water regulations stipulate a sodium limit of 200 mg/l. This Drinking water regulations stipulate a sodium limit of 200 mg/l. This
limit has been set so low so that people on a low sodium diet can still limit has been set so low so that people on a low sodium diet can still limit has been set so low so that people on a low sodium diet can still limit has been set so low so that people on a low sodium diet can still limit has been set so low so that people on a low sodium diet can still
drink water from the unit and use it for cooking. drink water from the unit and use it for cooking. drink water from the unit and use it for cooking. drink water from the unit and use it for cooking. drink water from the unit and use it for cooking.
Calculating the sodium content of partially softened water Calculating the sodium content of partially softened water Calculating the sodium content of partially softened water
Calculating the sodium content of partially softened water Calculating the sodium content of partially softened water
The sodium content increases by 8.2 mg/l if the hardness of untreated
water is decreased by 1 °d.
Hardness of untreated water – hardness of blended water x 8.2 mg/l
= increase in the sodium content.
Ask at the water works what the sodium content of untreated water is
(e.g. 10 mg/l).
Sodium content of untreated water + increase of sodium content (due
to softening) = sodium content of partially softened water.
Repeated dosage further increases the sodium content by
approx. 5 mg/l.
Drinking water regulations stipulate a sodium limit of 200 mg/l. We
recommend setting the treated water to a hardness between 4 °d and
8 °d. If the mandatory sodium limit of 200 mg/l is exceeded, the
blended water hardness may have to be set at more than 8 °d.
The unit is now ready for use.
Handing over the unit to the operator Handing over the unit to the operator Handing over the unit to the operator Handing over the unit to the operator Handing over the unit to the operator
If there is a delay between the installation of the unit and handover to
the user, a manual regeneration must be performed. The operator
must be told how the unit works as well as how to operate and inspect
it. Ensure that the operator receives the installation and operating ma-
nual.
GB GB GB GB GB
14+15) by turning them 14+15 14+15 14+15
14+15 14+15 14+15 14+15) by turning
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