Installation Conditions; General; Installation Site And Environment; Feed Water - BWT Rondomat Duo-DVGW 2 Einbau- Und Bedienungsanleitung

EN
5

Installation conditions

5.1

General

The unit must be installed as described in the installation 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 technical specifications.
5.2

Installation site and environment

Water softeners may not be installed in systems that provide water for
fire 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 floor drain and a separate mains
connection (230 V/50 Hz) must be located in the immediate vicinity.
If there is no floor drain, the Aqua Stop safety function integrated in the
water softener (available with some models) or the internal Aqua Stop
function may suffice.
However, this is at the property insurer's discretion. It is the unit opera-
tor's responsibility to clarify this.
If there is no floor drain and the water softener does not have an in-
tegrated Aqua Stop function, a separate safety device will have to be
installed on site in the direction of flow upstream of the softener.
This safety device (e.g. 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 when the unit is damaged.
The rated mains power (230 V/50 Hz) and the required operating pres-
sure 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 specifica-
tions of the Trinkwasser-verordnung (German drinking water ordinance)
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 consumption as defined in
the Trinkwasser-verordnung (German drinking water ordinance), the
ambient temperature must not exceed 25 °C.
If the treated water is intended for industrial purposes only, the ambient
temperature must not exceed 40 °C.
34
The unit's maximum operating pressure must never be exceeded (see
technical specifications). 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 (see techni-
cal specifications).
During pressure fluctuations and surges, the sum of the pressure surge
and the standing pressure must not exceed the nominal pressure. The
positive pressure surge must not exceed 2 bar and the negative pres-
sure surge must not be less than 50% of the self-adjusting flow pressure
(see DIN 1988-200/3.4.3).
Continuous operation of the water softener with water containing chlo-
rine 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/chlorine dioxide will
cause premature ageing of the ion exchange material. A water softener
reduces the concentration of free chlorine and chlorine dioxide. In other
words, the concentration in the outflow of a water softener is generally
considerably lower than in the inflow.
5.4

Installation

The pipeline network must be flushed before the unit can be installed.
You must check whether a mineral metering device needs to be installed
downstream from the water softener for the purpose of preventing cor-
rosion.
Use corrosion-resistant pipe materials for installation. Pay attention to
corrosion-causing chemical properties when different pipe materials are
combined (mixed installation), even in the inflow direction upstream of
the water softener.
A protective filter must be installed in the direction of flow 1 m upstream
of the unit. The filter must be functional before the softener is installed.
This is the only way to ensure that dirt and corrosive products do not
enter the water softener.
Test sample extraction points must be installed upstream and down-
stream of the unit, according to the specifications of VDI 6023.
The hose attached to the overflow point of the regenerative container
and the flushing water hose must be routed at an incline to the sewage
system or connected to a pump.
According to EN 1717, the flushing water hose and the overflow hose
must be connected to the sewage system at a specified distance above
the highest possible waste water level. (Distance is greater than the
diameter of the drain pipe).
If the flushing water is fed into a pump, it must be designed for a water
volume of at least 2 m /h or 35 l/min for units for building services and at
3
least 3 m /h or 50 l/min for Rondomat and AQA perla professional units.
3
If the pump is used for other units concurrently, it must be of a larger
size to suit the units' water output volumes. The pump must be salt-
water resistant.
5.5

Operation

The performance specifications of the unit must match the expected
usage conditions. Related information can be found in DIN 1988-200
and in the technical specifications.
After periods in which little or no water is tapped, e.g. during holidays,
you must fully open the tap for at least 5 minutes before you can use the
water again (see the section on stoppages in the operating instructions).
The microbiological quality of the softened water is also determined by
the quality of the regenerative used.