6
MAINTENANCE
FANS
Check the cleanliness of the fans when servicing the filters
and the heat recovery cell. Clean the fans as required.
The fans are very sensitive to external impacts, and it is
recommended that they be cleaned in place rather than
removing them.
You can clean the fan blades with compressed air or by
brushing them gently. Do not remove or move the fan
blade balancing weights.
Cleaning the supply air fan (T)
• Remove the extract air filter (C), the upper support
of the cell (E), and the heat recovery cell (D) from the
unit following the instructions provided earlier.
• Remove the temperature sensor from the top of
the extract air duct (G) (figure 1) by pulling and next
remove the stopper screw from the bottom edge of
the duct. The extract air duct can now be removed
by simultaneously turning and pushing it downwards
(figures 2 and 3).
• Remove the temperature sensor from the resistance
support (figure 4).
• Next, remove the additional and post-heating radiator
support (H), which is attached by two wing nuts from
below (figure 5).
• Pull the resistor and the support out of the unit and
remove the quick connector of the radiator wires. The
fan can now be cleaned in place.
• To remove the fan, lift the fan upwards and push the
plastic locking of the fan to the right using e.g. a flat-
headed screwdriver (figure 6). This will make the fan
fall downwards.
• Pull the fan out of the unit. Disconnect the quick
connector of the fan cables.
• If required, remove the bypass arm from the end of
the intermediate wall (figure 7).
T
H
G
T
S
A
B
C
E
D
1
4
7
2
5
3
6
T
R model in the figure.
In the L model, the parts are mirrored
