Danfoss DHP-A Service Instructions Manual page 25

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Ensure that all pipes are elastically suspended, with mountings as illustrated or similar. This is so that the rub-
ber (or similar material) compresses 1 to 2 mm under vibration. It is not recommended to suspend the pipes
from too many points, as the force at each mounting is then not sufficient.
Figure 18. Elastic pipe suspension.
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If the heat pump is located indoors and the ceiling in the area is unsuitable to suspend the aforementioned
pipe mountings, set up (or construct) special stands on the floor from which the pipes can be suspended.
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Ensure that pipe lines do not lie against walls that they run along and that foam insulation is wrapped around
the entire pipe, not just on top of it.
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Pipes inside the heat pump must not be against each other (if they are, clamp and secure suitable rubber, pull-
ing the pipes apart by hand only helps temporarily).
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If the heat pump is on an unstable surface, position rubber feet designed for its weight underneath.
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If necessary, use rubber straps to secure flexible hoses in position, so that they do not lie against each other or
create vibration bridges.
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Ensure that electrical wiring is not put under strain, if it is it creates vibration bridges.
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If possible, install the heat pump in a location that is sound insulated from areas that are frequented by resi-
dents.
Soundproofing measures to carry out afterwards:
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Go through the aforementioned points and improve if possible.
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Hood for compressor (most effective for high frequencies).
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Improve the acoustic environment of the heat pump by installing acoustic panels on the walls and ceiling.
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In some instances, it is recommended that the heat pump is moved to another area.
6.3.2 Laying cabling
Note! Electrical connection can also cause noise so this installation must be carried out appropriately. An
appropriate installation is where there is approximately 300 mm free cable between the heat pump and
the building. It is inappropriate to bolt trunking between the heat pump and the wall. This is because
vibrations can then be transmitted from the heat pump through the trunking to the walls of the house.
Figure 19. Recommended distance between trunking on the wall and trunking on the heat pump is 300 mm
Service instructions VMGFC302 – 23