10
7.2.7 Compensators (accessories)
For stress free installation of the pressure- boost-
ing system, connect the pipes using compensa-
tors. The compensators must be equipped with a
structure-borne noise insulating extension limiter
to absorb the reaction forces that occur. The com-
pensators must be installed stress free in the pipes.
No alignment errors or pipe displacement must
be compensated for with compensators. When
installing, the screws must be tightened uniformly,
working across diagonals. 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, radiated heat). Do
not paint rubber component of compensators and
protect against oil. The compensators must be
accessible for inspection within the system at any
time and must therefore not be covered by the
pipe insulation.
NOTICE!
Compensators are subject to wear. It is necessary
to regularly check for cracks or blisters, exposed
fabric or other defects.
7.2.8 Flexible connection pipes (accessories)
In the case of pipes with threaded connections,
flexible connection pipes can be used for stress-
free installation of the pressure-boosting system
and in the event of slight pipe displacement.
The flexible connection pipes in the Wilo range
consist of a high quality stainless steel corrugated
hose with stainless steel braiding. A flat-sealing
stainless steel screwed connection with a female
thread is provided at one end for installation on
the pressure-boosting system. A male pipe thread
is provided at the other end to connect to further
pipework. Depending on the size, certain maximum
admissible deformation limits must be met (see
below). Flexible connection pipes are not suitable
for absorbing axial vibrations and compensating
the corresponding movements. A suitable tool
must be used to prevent kinking or twisting during
the installation. In the event of angular displace-
ment of the pipes, it is necessary to fixate the
system to the floor, taking into account suitable
measures to reduce the structure-borne noise. The
flexible connection pipes in the system must be
accessible for inspection at any time and must not
be covered by the pipe insulation.
NOTICE!
Flexible connection pipes are subject to wear in
operation. Regular checks for leakages or other
defects are necessary.
Nominal Diameter,
connection
Thread
screwed connection
Tapered male
thread
Max. bend radius RB
in mm
Max. bend angle BW
in °
DN32
Rp 1¼"
R 1¼"
250
60
DN40
Rp 1½"
R 1½"
260
60
DN50
Rp 2"
R 2"
300
50
DN65
Rp 2½"
R 2½"
370
40
7.3 Electrical connection
DANGER! Risk of fatal injury!
The electrical connection must be established
in compliance with the local regulations by an
electrical installation engineer approved by the
local energy supply company.
Pressure-boosting systems in the ISAR MODH1
series are equipped with control devices in the SC
series. To make the electrical connection, the cor-
responding installation and operating instructions
and attached electrical wiring diagrams must be
observed. Points to be considered are listed in the
following:
•The current type, voltage and frequency of the
power supply must match the details on the rating
plate of the control device.
•The electrical connection cable must be ade-
quately dimensioned for the total power of the
pressure-boosting system (see rating plate).
•External fuse protection of the connection cable
for the pressure-boosting system must be pro-
vided in accordance with the applicable local reg-
ulations in compliance with the installation and
operating instructions
NOTICE! -
Isolator terminal cables size Min 1.5mm
2
Max 35.0mm
2
8
•As a protective measure, the pressure-boosting
system must be earthed according to regulations
(i.e. according to the local regulations and circum-
stances) and the connections intended for this
purpose identified
DANGER! Risk of fatal injury!
As an additional protective measure against dan-
gerous contact voltages:
•The pressure boosting system is fitted with a
frequency converter SCe, a universal-
current-sensitive residual-current-operated
protection switch with a trigger current of
300 mA must be installed.
•The protection class of the system and of the in-
dividual components can be taken from the rating
plates and/or data sheets.
•Further measures/settings, etc. are described in
the installation and operating instructions and also
the circuit diagram of the control device.
Commissioning/shutdown
We recommend that the initial commissioning of
the system is performed by the Wilo customer ser-
vice department. Contact [email protected].
Summary of Contents for ISAR MODH1 Series
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