BWT AQA perla XL - Feed Water; General Information; Installation Conditions; Installation Site and Environment

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5 Installation conditions
5.1 General information
The unit must be installed as described in the in-
stallation instructions and in compliance with AVB
Wasser V, §12.2 (general requirements for the
supplyofwaterinGermany).Itmustbeinstalled
by a water utility company or by an installation
company registered in the water utility company’s
index of installers.
Observe all applicable local installation regulations,
general guidelines, sanitary requirements and tech-
nicalspecications.
5.2 Installation site and environment
Water softeners may not be installed in systems
thatprovidewaterforreextinguishingpurposes.
The installation site must be kept free of frost, must
protect the unit from chemicals, paint, solvents
and fumes, must be structurally waterproofed in
accordance with DIN 18195-5 and must allow for
easy connection to the water supply system.
Aconnectiontothesewagesystem,aoordrain
and a separate mains connection (230 V/50 Hz)
must be located in the immediate vicinity.
Ifthereisnooordrain,theAquastopsafetyfunction
integrated into the water softener (available with
some models) or the internalAquastopfunction
maysufce.
However, this is at the property insurer’s discretion.
It is the unit operator’s responsibility to clarify this.
If there is no oor drain and the water softener
does not have an integrated Aqua Stop function, a
separate safety device will have to be installed on
siteinthedirectionofowupstreamofthesoftener.
Thissafetydevice(e.g.externalBWTAquastop)has
to shut off the water supply when there is no current
in order to prevent unintended water leakage from
the water softener if the unit is damaged.
Therated mains power (230 V /50 Hz) and the
required operating pressure must be present at
all times. A separate means of protection against
a shortage of water is not provided and must be
installed on site if desired.
5.3 Feed water
The hard water to be fed into the unit must always
meet the specications 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. Install a bleed device if necessary.
If the treated water is intended for human con-
sumptionasdenedintheGermanDrinkingWater
Ordinance, the ambient temperature must not
exceed 25 °C.
If the treated water is intended for industrial pur-
poses only, the ambient temperature must not
exceed 40 °C.
The unit’s maximum operating pressure must never
beexceeded(seechapter12,technicalspecica-
tions).Ifthenetworkpressureishigher,apressure
reducer must be installed upstream of the unit.
The unit requires a minimum operating pressure
to function correctly (see chapter 12, technical
specications).
The optimal operating pressure is between 3 and
6 bar.
Duringpressureuctuationsandsurges,thesum
of the pressure surge and the standing pressure
must not exceed the nominal pressure. The po-
sitive pressure surge must not exceed 2 bar and
the negative pressure surge must not be less than
50%oftheself-adjustingowpressure(seeDIN
1988-200/3.4.3).
Continuous operation of the water softener with wa-
ter containing chlorine or chlorine dioxide is possible
if the concentration of free chlorine / chlorine dioxide
does not exceed 0.5 mg/l.
Continuous operation with water containing chlorine
or chlorine dioxide can lead to premature ageing
if an organic ion exchange material is used. A
water softener can reduce the concentration of
free chlorine and chlorine dioxide. In other words,
theconcentrationintheoutowofawatersoftener
isgenerallyconsiderablylowerthanintheinow.