8
© Airflow • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
MAINTENANCE INSTRUCTIONS
Fans
Check the cleanliness of the fans when carrying out maintenance for fi lters and the heat
recovery cell. Clean the fans if needed. The fans are very sensitive to external mechanical
damage, and it is recommended to clean them in place.
The fan blades can be cleaned with compressed air or with a brush. Do not remove or move
the balancing pieces on the fan blade.
Cleaning supply air fan (T)
Remove the extract air filter (C), upper support for the HR cell (E) and the HR cell (D) from the
unit as instructed earlier. Pull the temperature sensor off from the upper part of the extract air
duct (G) (figure 1) and then remove the stopper screw from the lower edge of the duct. After
that the extract air duct comes out by turning and simultaneously pushing downwards (figures
2 and 3).Detach the temperature sensor from the resistor support (figure 4).Then detach the
support of the additional and post-heating resistors (H), fastened with two butterfl y nuts from
downward (figure 5). Then pull the resistors and the support from the unit and disconnect the
quick coupling of the resistor conductors. The fan can now be cleaned in place. If you wish
to detach the fan, lift it upwards and crank the plastic lock to the right using for instance a
chisel (figure 6).The fan then falls down and can be pulled out of the unit. Disconnect the
quick coupling of the fan conductors. When needed, detach the intermediate shaft of the
bypass damper from the end of the partition wall (figure 7).
Condensing water
During the heating season, humidity of extract air condenses into condensing water. Water
formation may be abundant in new buildings or if ventilation is low compared to the
humidity build-up caused by the residents. Condensing water needs to fl ow out from the
ventilation unit without hindrance. When carrying out maintenance, for instance in autumn
before the beginning of the heating season, make sure that the condensing water outlet in
the bottom tank is not clogged. You can check it by pouring a little water in the tank. Clean
if needed. Do not let water fl ow into electrical devices.
Cleaning extract air fan (P)
Remove the supply air fi lters G4 and F7.Open the four screws (F, figure 8) on the protective
cover of the extract air fan and remove the cover. You can now clean the extract air fan in
place (figure 9). If you wish to detach the fan, lift it upwards and crank the plastic lock of
the fan to the right using for instance a chisel (figure 6).The fan then falls down and can
be pulled out of the unit (figure 10. Disconnect the quick coupling of the fan conductors.
T
H
G
i
F
P
F
1
4
7
2
5
3
6
8
9
10
180
14
1
180
14
1
43
Model R
Model L
Model R
Supply air fan
Extract air fan
Condensing water
DV145SE
