Maintenance
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3.3 Maintenance instructions
3.3.1 Changing supply/extract air filter
The bag filter cannot be cleaned and must be changed when necessary. New filters can be ordered from Systemair. Op-
eration time between filter changes depends on the air pollution at the installation site. A differential pressure switch
indicates when it’s time to change the filters. This will trigger an alarm in the control panel.
When this occurs do the following:
1. Replace the filters with new ones as described below.
2. Press on the alarm symbol
on the control panel.
3. Choose Filter alarm and press acknowledge.
Fig. 5 Changing filters
3.3.2 Checking the rotating heat exchanger
After a long time of use dust may build up in the exchanger and block the airflow. It is important to clean the exchanger
regularly to maintain high efficiency. The complete rotating heat exchanger block can be taken out of the unit (figure 6)
in the smaller models to facilitate cleaning and maintenance. Wash in hot soapy water or use pressure air. Do not use
detergent containing ammonia.
Check at least once a year that the exchanger rotor rotates easily. Check this by removing the driving belt and move
the rotor by hand. Check also that the brushes are undamaged. The rotor bearings are permanently lubricated from fac-
tory and should not be re-greased.
Check 4 times per year that the driving belt is sufficiently tense, that it follows the tracks and that it is undamaged. If
the belt tension is too low it needs to be shortened.
Fig. 6 Dismounting the heat exchanger
151618 | A002
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