Ochsner AIR HAWK 518, Design And Installation Manual

Page: 16 / 60

16 www.ochsner.com | 00_400_200_202_02_split_Planung_Errichtung-EN
Refrigerant lines
1 Where the pipe liner has two 90° bends, it must be
laid together with the refrigerant lines.
2 If the pipe liner is laid empty, it will not be possible to
insert the refrigerant pipes afterwards.
»
For the underground pipe liner, use rigid underground
sewer pipes. We recommend using sound-insulated
underground sewer pipes.
»
Use a pipe liner of a suitable diameter for the sys-
tem-specific refrigerant pipes and the planned pipe
bends.
»
For 90° bends in the pipes, use either 3x30° or 6x15°
bending radii (depending on the diameter of the pipe
liner and the installation depth).
»
At the point where the refrigerant pipes are connect-
ed to the outdoor unit, create a suitable trench.
»
Dig a straight trench between the wall conduit and the
trench at the outdoor unit.
»
Lay the pipe liner, with the refrigerant pipes already
inserted, in the trench between the outdoor and in-
door units.
»
Lay the electrical control and power supply cables in
a suitable electrical conduit.
»
Allow some surplus length in the refrigerant pipes
between the connections at the indoor and outdoor
units.
»
Ensure that the open end of the pipe liner at the
outdoor unit is properly sealed. For sealing the re-
frigerant pipes in the pipe liner, use for example an
appropriate ring seal or a UV-resistant, permanently
flexible sealing compound.
»
Any exposed refrigerant lines outside the pipe liner
must also be protected from a build-up of conden-
sation and corrosion using appropriate insulating
material. Outside, the insulating material must also
have UV protection.
Note
Insulation used beneath the soil must be of a
closed-cell material construction. Otherwise, the
thermal insulation value of the material will be im-
paired.
Material damage
PU foam is not suitable as a sealant for the pipe
liner.
6.2 Wall conduit
Whether the refrigerant pipes between the indoor and
outdoor units are to be routed above or below ground,
appropriate and system-specific wall conduits need to be
created through the outer wall of the building.
»
Ensure that the wall conduit is installed in an appro-
priate, plant-specific position layout.
»
Take the construction of the wall (tiles, concrete) into
account.
»
Take the prevailing groundwater situation into
account.
Material damage
Inadequate wall conduits can cause significant
damage to property, due to water penetrating the
building or stonework (seepage, condensation,
flood water). With wall conduits created below
ground level, the breach must be appropriate to
local conditions at the site (e.g. non-accumulating
or accumulating seepage water, groundwater un-
der pressure).
»
Use a suitable pipe liner or wall sleeve for the
wall conduit.
»
Integrate the external end of the wall conduit
into the external waterproof seal of the build-
ing.
»
Ensure that the pipe liner is arranged with a
slight fall (at least 2%) to the outside.
»
Use appropriate ring seals to seal the space
between the wall sleeve and the refrigerant
pipes and electrical cables passing through,
on both the outer and inner edge of the wall.