Foundation/Bearing Surface; Hydraulic Connection And Pipes - Wilo Economy Notice De Montage Et De Mise En Service

7.2 Installation

7.2.1 Foundation/bearing surface

The DEA is constructed for installation on flat
concrete floors. The base frame is mounted on
height-adjustable vibration dampers to prevent
structure-borne noise.
NOTE:
The vibration dampers will probably not be fitted
when the equipment is delivered for transport
reasons. Before installing the DEA, check whether
all the vibration dampers are fitted and locked by
the threaded nut. (also see Figure 7a).
If additional onsite fixation is required, suitable
measures must be taken to avoid structure-borne
noise.

7.2.2 Hydraulic connection and pipes

• When connecting to the public potable water
mains, the requirements of the local water supply
company must be met.
• First perform all the welding and soldering work
and the necessary flushing and, if necessary, dis-
infecting of the pipe system and the boosting sys-
tem delivered (see 5.2.3) before connecting the
system.
• The onsite pipes have to be installed stress-free.
Compensators with extension limiters or flexible
connecting lines are recommended for this pur-
pose in order to avoid stress on the pipe connec-
tions and minimise the transmission of system
vibrations to the building installation. In order to
prevent the transmission of structure-borne noise
to the building, do not secure the pipe clamps to
the DEA pipes (see Fig. 7 for example).
• The connection is made either on the right or left
of the system, depending on the site conditions. It
may be necessary to move blind flanges or thread
caps that are already fitted.
• In the case of boosting systems with horizontal
pumps, the pipes on the suction side in particular
must be supported so that the tilting moment that
a shift in the system's centre of gravity can gener-
ate are safely absorbed (see Fig. 8).
• The flow resistance of the suction line must be
kept as low as possible (i.e. short pipe, few elbows
and sufficiently large check valves), otherwise the
protection against low water level may respond
through severe pressure losses in the event of
high volume flows. (Observe NPSH of the pump,
avoid pressure loss and cavitation).
7.2.3 Hygiene (TrinkwV 2001)
The DEA technology you have received equals the
current state of the art, in particular DIN 1988, and
has been checked at the factory to make sure it
functions perfectly.
When used for potable water applications, the
complete potable water supply system has to be
transferred to the operator in a perfectly hygienic
condition. Also observe the corresponding speci-
fications in DIN 1988 Part 2 section 11.2 and the
comments on the DIN.
Installation and operating instructions Wilo-DEA
According to TwVO § 5, paragraph 4 , this also
includes microbiological requirements, flushing if
necessary and also disinfecting under some cir-
cumstances.
The limit values to be met are given in TwVO § 5.
WARNING! Contaminated potable water is a
health hazard!
Flushing the pipes and the system reduces the
risk of adversely affecting the potable water
quality.
The water must be completely replaced after a
longer period of system standstill.
For the simple flushing of the system, we recom-
mend the installation of a T-piece on the dis-
charge side of the DEA (if there is a diaphragm
pressure vessel on the discharge side, immediately
behind it) in front of the next shut-off device. Its
branch, provided with a shut-off device, drains
into the waste water system during the flushing
process and has to be dimensioned according to
the maximum volume flow of an individual pump
(see Fig. 10). If it is not possible to achieve free
drainage, the explanations in DIN 1988 T5 must be
observed when connecting a hose, for example.
7.2.4 Dry-running protection system and protection
against low water level (accessory)
• To fit the dry-running protection system:
• Direct connection to the public water mains:
Screw the protection against low water level
(WMS) into the socket provided on the suction
manifold pipe and seal (if retrofitting) and make
the electrical connection in the control unit
according to the installation and operating
instructions and the control unit wiring diagram.
• In the case of an indirect connection, i.e. for
operating with onsite tanks: Fit the float switch
in the tank so that if the water level drops to
approximately 100 mm above the extraction
connection, the "low-water" switching signal is
transmitted. (If break tanks from the Wilo range
are used, a float switch is already installed).
Alternative: install 3 submersible electrodes in
the storage tank.
Arrange them as follows:
a firstthe first electrode is placed just above the
floor of the tank as an earth electrode (must
always be submerged) and for the bottom
switching level (low-water) a second electrode
is placed approximately 100 mm above the
draw-off connection.
For the top switching level (low-water signal
cancelled), a third electrode must be placed at
least 150 mm above the bottom electrode.
Make the electrical connection in the control
unit according to the installation and operating
instructions and the control unit wiring diagram.
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