BWT AQA smart Einbau- Und Bedienungsanleitung Seite 35

Feed-in water
The hard water to be fed into the unit must always
meet the specifications of the German Drinking
Water Ordinance [Trinkwasserverordnung] or EU
Directive 98/83/EC. The total dissolved iron and
manganese may not exceed 0.1 mg/l. The hard
water to be fed into the unit must always be free of air
bubbles. If necessary, a deaerator must be installed.
The maximum operating pressure of the unit must
not be exceeded (see technical data). If the network
pressure is higher, then a pressure reducer must be
installed upstream of the unit.
A minimum operating pressure is required for the
functioning of the system (see technical data).
In the case of pressure deviations and pressure
surges, the total of the pressure surge and standing
pressure must not exceed the nominal pressure,
meaning the positive pressure surge must not ex-
ceed 2 bar and the negative pressure surge must
not fall beneath 50% of the adjusted flow pressure
(see DIN 1988-200/3.4.3).
Continuous operation of the softening unit with water
containing chlorine or chlorine dioxide is possible if
the concentration of free chlorine / chlorine dioxide
does not exceed 0.5 mg/l.
However, continuous operation with water con-
taining chlorine/chlorine dioxide causes the ion
exchanger resin to age prematurely. A softening
unit reduces the concentration of free chlorine and
chlorine dioxide. In other words, the concentration
in the outflow of a softening unit is generally consi-
derably lower than in the inflow.
Installation
The pipe network must be flushed before the unit
is installed.
It must be checked whether the system must be
downstream of a mineral compound dosing system
to protect against corrosion.
Use corrosion-resistant pipe materials for installati-
on. Observe corrosion-causing chemical properties
in the combination of different pipes (mixed instal-
lation), even in the direction of the flow upstream
of the softening unit.
A protective filter must be installed in the direction of
flow, no more than 1 m in upstream of the system.
The filter must be functioning before the soft water
system is installed. This is the only way to guarantee
that dirt and corrosive products are not flushed into
the soft water system.
According to the regulations of VDI 6023, suitable
sampling points must be installed upstream and
downstream of the system.
The hose attached to the overflow of the brine
container and flushing water hose must be routed
at an incline to the sewage system or connected
to a pump.
According to DIN 1717, the flushing water hose and
the overflow hose must be secured at the specified
distance from the highest possible waste water level
to the sewage connection (distance greater than the
diameter of the waste pipe).
If flushing water is fed into a pump, it must be
designed for a water quantity of at least 2m
35 l/min. If the pump is used for other units simulta-
neously, it must be sized larger by a factor of their
water output quantities.
The pump must be salt-water resistant.
Operation
The size of the system must conform to the expected
usage conditions. You can find more information
about this in DIN 1988-200 and the technical data
section.
After periods of no or low water extraction, e.g.
during holiday periods, is lower, an extraction valve
should be fully opened for at least 5 minutes before
the water can be used again (see chapter on Breaks
in operation).
EN
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