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Base
D
C
E
Fig. 9: Example of a foundation screwed con-
nection
52
CAUTION
A faulty foundation or incorrect installation of the unit!
A faulty foundation or incorrect installation of the unit on the foundation
can lead to defects of the pump.
• These defects are not covered by the warranty.
• Never set up the pump unit on unfortified surfaces or surfaces that can-
not bear loads.
Installing the pump on an elastically supported base can provide better structure-borne
sound insulation between the pump and the building.
When a pump is at a standstill, it can be protected from bearing damage caused by the oscil-
lation of other units (e.g. in a system with multiple redundant pumps) when the pump is
placed on its own base.
When pumps are installed on floor slabs, elastic supports are strongly recommended.
Particular care must be taken with variable-speed pumps.
Wilo recommends taking into account all constructionally and acoustically relevant criteria. A
qualified building acoustics specialist should be tasked with dimensioning and design where
necessary.
Select elastic elements according to the lowest excitation frequency. This is usually the
speed. If speed is variable, the lowest speed is to be assumed.
To achieve an insulation level of at least 60%, the lowest excitation frequency must be at
least twice as high as the natural frequency of the elastic support. Therefore, the lower the
speed, the smaller the spring resilience of the elastic elements must be.
In general, the following materials can be used:
•
For a speed of 3000 rpm and more, natural cork panels
•
For a speed between 1000 rpm and 3000 rpm, rubber-metal elements
•
For a speed under 1000 rpm, screw springs
When constructing the base, avoid acoustic bridges – through plaster, tiles or auxiliary con-
structions – which could render the insulation ineffective or greatly reduce its effect.
In the case of pipe connection, the flexure of the elastic elements under the weight of the
pump and base must be taken into account.
Consultants and installers must ensure that the pipe connections to the pump are designed
in such a way that they are completely free of stress and have no mass or oscillation influ-
ence on the pump housing whatsoever. The use of compensators makes sense here.
NOTICE
For some pump types, simultaneous separation of the foundation block it-
self from the building structure by means of an elastic intermediate layer
(e.g. cork or MAFUND® plate) is required for vibration-insulated installa-
tion.
Example of a foundation screwed connection
•
Align the complete unit when installing it on the foundation with the help of the spirit
A B
level (at the shaft/discharge port).
•
Always put the washers (B) to the left and right directly at the fixation material (e.g. stone
bolts (A)) between the baseplate (E) and foundation (D).
•
Evenly and firmly tighten the fixation material.
•
For distances > 0.75 m, support the baseplate at the centre between the fixation ele-
ments.
Installation and operating instructions • Wilo-VeroLine-IPL-Z, Wilo-VeroTwin-DPL-Z • Ed.01/2024-07
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