Wilo VeroLine-IPL Notice De Montage Et De Mise En Service page 33

Positioning/alignment
r 2,5 · (d · 2s)
5 x DN
Fig. 9: Settling section before and after the
pump
Installation and operating instructions Wilo-IPL/DPL (1.1-7.5 kW)
always strongly recommended. Particular care must be taken with
variable speed pumps. It is recommended - taking into account all
constructionally and acoustically relevant criteria - that a qualified
building acoustics specialist be given the task of configuration and
design where necessary.
The flexible elements shall be selected according to the lowest exci-
tation frequency. This is usually the rotation speed. In the case of var-
iable speed, assume the lowest rotation speed. The lowest excitation
frequency should be at least twice as much as the inherent frequency
of the flexible mounting, so that an insulation level of at least 60% is
achieved. Therefore, the spring resilience of the flexible elements
must be smaller the lower the rotation speed. In general, it is possible
to use natural cork panels at a rotation speed of 3000 rpm and more,
rubber/metal elements at a rotation speed between 1000 and 3000
rpm and coil springs at a rotation speed below 1000 rpm. In terms of
the configuration of the foundation, care should be taken to avoid any
acoustic bridges being formed by plaster, tiles or secondary struc-
tures since these will invalidate or significantly reduce the insulating
effect. In the case of pipe connection, it is necessary to take account
of the flexure of the flexible elements under the weight of the pump
and foundation. Planning engineers and installation companies must
take care to ensure that the pipe connections to the pump are com-
pletely stress-free in their design and unable to exert any gravita-
tional or vibration influences on the pump housing whatsoever. The
use of expansion joints represents a good idea in this regard.
• A hook or eyelet with the corresponding bearing capacity is to be
installed vertically above the pump (for the total weight of the pump:
see catalogue/data sheet), to which hoisting gear or similar aids can
be attached when conducting maintenance or repair work on the
pump.
CAUTION! Risk of material damage!
Danger of damage due to incorrect handling.
• Only use lifting eyes on the motor for carrying the weight of the
motor and not for carrying the entire pump.
• Lift the pump using permitted load-bearing equipment
(see chapter 3 "Transport and interim storage" on page 25).
• Minimum distance between a wall and the fan guard of the motor:
15 cm.
• The suction and pressure flange are both marked with a cast arrow to
indicate the flow direction. The direction of flow must correspond to
the direction arrows on the flanges.
• Shut-off devices must be installed without fail in front of and behind
the pump in order to avoid the entire system being drained when the
pump is inspected or exchanged.
• If there is a danger of return flow, a non-return valve must be used.
NOTE
A settling section must be provided before and after the pump, in the
form of a straight pipe. The length of this settling section should be at
least 5 x DN of the pump flange (fig. 9). This measure serves to avoid
flow cavitation.
• The pipes and pump must be free of mechanical stress when installed.
The pipes must be fixed in such a way that the pump is not supporting
the weight of the pipes.
• The bleed valve (fig. /1/2, item 2.1) must always face upwards.
• When using the pump in air-conditioning or cooling systems, the
condensate which accumulates in the lantern can be discharged spe-
cifically via the existing holes.
• All installation positions except for "motor facing down" are allowed.
English
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