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The installation of underlayment with impact sound insulation properties and high specifications is
highly recommended. It is recommended, depending on the location of the erection, to underlay the
AHU with cork, Mafund plates or Sylomer strips. The used absorbent material must be adjusted to
the load to achieve optimum noise insulation. Each contact point between AHU and foundation must
be noise insulated. Additionally, the respective design criteria of the manufacturer must be com-
plied. For the weight specifications of the AHU see the technical data sheet.
4.2
Erection
4.2.1
Potential risks that may arise at the erection site
For heating or cooling water or water-glycol circuits these can be connected to the AHU.
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The pipes or hoses and their fittings can become leaky or loose, so that inside or outside of the
AHU water or the medium exits.
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Cooling processes can cause dehumidification and the associated formation of condensation in
the AHU. The AHU is then equipped with condensate collecting trays and outlets. Nevertheless,
condensate can exit from the AHU in case of errors on the AHU, under inadmissible or extreme
operating conditions. Errors on the AHU, inadmissible or extreme operating conditions can also
cause the formation of condensate on the outer surfaces of the AHU, which may then drip down.
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Internal and external cleaning - also wet cleaning - can be performed on the AHU. When per-
forming this work, an exit/dripping down of the cleaning fluid is possible.
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All parts which are in contact with water inside and outside of the AHU may freeze under certain
environmental conditions. Particularly, the following components have an increased risk of freez-
ing:
o Condensate pans of heat recovery systems and heat exchangers inclusive pan nozzles,
siphons and drains
o Freezing condensate directly on the heat recovery system and heat exchanger
o Freezing operation fluid of heat exchangers with/without glycol
V07-19.0
Figure 13: Solid foundation and strip foundation
23/115
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