Flexible Connection Lines (Accessory); Electrical Connection - Wilo Economy Notice De Montage Et De Mise En Service

7.2.8 Compensators (accessory)
For stress-free installation of the DEA, the pipes
must be connected with compensators (Fig. 7a).
The compensators must be equipped with a struc-
ture-borne noise-insulating extension limiter to
absorb the reaction forces that occur. The com-
pensators must be installed stress-free in the
pipes. Alignment errors or pipe displacement may
not be compensated for with compensators.
When installing, the screws must be tightened
uniformly crosswise. The ends of the screws must
not project beyond the flange. If welding work is
done nearby, the compensators must be covered
for protection (sparks and radiated heat). The rub-
ber parts of compensators must not be painted
and must be protected from oil. In the system, the
compensators must be accessible for inspection
at all times and therefore should not be included in
the pipe insulation.
NOTE:
Compensators are subject to wear. It is necessary
to regularly check for cracks or blisters, exposed
fabric or other defects (see recommendations in
DIN 1988).
Nominal diameter
Connection
DN40
DN50
DN65
Table 2
NOTE:
Flexible connecting pipes are subject to wear in
operation. Check regularly for leaks or other
defects (see recommendations in DIN 1988).
7.2.10 Pressure reducer (accessory)
The use of a pressure reducer is necessary with
pressure fluctuations in the supply pipe of more
than 1 bar or if the supply pressure fluctuation is
so great that the system has to be switched off or
the total pressure (supply pressure and pump head
at the zero volume point - see characteristic
curve) of the system exceeds the nominal pres-
sure. The pressure relief valve can only perform its
function if there is a minimum pressure gradient of
approx. 5 m or 0.5 bar. The pressure downstream
of the pressure reducer (back-pressure) is the
basis for the total head calculation of the DEA.
When installing a pressure reducer, there should
be an installation section of approximately
600 mm on the supply pressure side.
Installation and operating instructions Wilo-DEA
Screwed Tapered male
connection thread thread
Rp1 1/2" R1 1/2"
Rp 2" R 2"
Rp 2 1/2" R 2 1/2"

7.2.9 Flexible connection lines (accessory)

In the case of pipes with threaded connections,
flexible connection lines can be used for stress-
free installation of the DEA and in the event of
slight pipe displacement (Fig. 7b). The flexible
connection lines in the WILO range consist of a
high quality stainless steel corrugated hose with
stainless steel braiding. A flat-sealing, stainless
steel screw connection with female thread is pro-
vided on one end for fitting to the DEA. An exter-
nal pipe thread is provided at the other end to
connect to continuing pipework. Depending on
the respective size, certain maximum admissible
deformation values must be met (see table 2 and
Fig. 7b). Flexible connection lines are not suitable
for absorbing axial vibrations and compensating
corresponding movements. A suitable tool must
prevent kinking or twisting during installation. In
the case of angular displacement of the pipes, it is
necessary to fix the system to the floor, taking
into account suitable measures to reduce struc-
ture-borne noise.
The compensators in the system must be accessi-
ble for inspection at any time and therefore should
not be included in the pipe insulation.
Max. radius
of curvature
RB in mm
260
300
370

7.3 Electrical connection

DANGER! Risk of fatal injury!
The electrical connection must be made accord-
ing to the local regulations (VDE regulations) by
an electrical installation engineer approved by
local electricity supply companies.
The DEA can be equipped with different types of
control units. To make the electrical connection,
the corresponding installation and operating
instructions and attached electrical circuit dia-
grams must be observed. General points to be
considered are listed below:
• The type of current and voltage of the mains con-
nection must comply with the details on the type
plate and the wiring diagram of the control unit,
• The electrical connection line must be adequately
dimensioned according to the total power of the
DEA (see type plate and data sheet),
• External protection must be provided according to
DIN 57100/VDE 0100 Part 430 and Part 523 (see
data sheet and wiring diagrams),
• As a protective measure, the DEA must be earthed
according to regulation (i.e. according to the local
regulations and circumstances). The connections
intended for this purpose are identified accord-
ingly (see wiring diagram).
Max. bending angle
BW in °
60
50
40
English
29