Installation manual
18
2.2.2
2.2.2 Air intake and air outlet via light wells
If the wall openings for the air ducting on either the air intake or
air outlet are positioned below ground level, it is recommended
that the air circuit is routed through plastic light wells which do not
impede the air flow. A cowling must be installed if the wells are
made of concrete.
The minimum light well dimensions are 1000x400 mm
(Refer to the device information for the minimum dimensions
for the air ducting if 2 compressors are installed)
The transition between the light well and the wall opening
(see Chap. 2.2.4 on p. 18) should be sealed
The light well should be covered with a grating (safeguarded
against burglary)
An outlet for condensate must be provided
A wire grating (0.8 cm > mesh size) should be fitted to
prevent small animals from entering and leaves from falling
in.
Fig. 2.1: Air inlet openings - light well
2.2.3 Heat pump rain guard
Rain guards act as a visual covering for wall openings above
ground and also protect the air ducting from the effects of the
weather. They are mounted on outside walls and can therefore
be used independent of the type of air circuit. The rain guard
(special accessory) has been specially developed for heat
pumps and features a significantly lower pressure drop than
standard rain guards. It can be used either on the air intake or
the air outlet side.
A wire grating should be fitted between the wall and the rain
guard to prevent small animals from entering and leaves from
falling in. At least 80 % of the grating’s cross section mustbe
open (mesh size > 0.8cm). Measures to safeguard the rain guard
against burglary are to take place on site.
Fig. 2.2: Heat pump rain guard
2.2.4 Insulation of wall openings
Necessary wall openings should be provided on site. It is
essential that the interior side of the wall opening in lined with
thermal insulation to prevent the wall from becoming cold and to
prevent moisture from penetrating the wall. For example, Fig. 2.3
on p. 18 illustrates insulation using rigid polyurethane foam (25-
mm insulation thickness). The transition between the wall
insulation and the wall-mounted junction box must be sealed air-
tight. Water which has penetrated due to adverse weather
conditions (e.g. driving rain) should be routed outside by means
of a gradient.
Fig. 2.3: Example of how to construct the wall opening
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Item Description 500-700 800
1 Rain guard 1 item 1 item
2 Dowel 6 x 30 4 items 6 items
3 Screw 5 x 70 4 items 6 items
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