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Countercurrent heat exchanger
Inspect the countercurrent heat exchanger. If this is dirty,
it should be removed and washed in warm soapy water and
then rinsed, e.g. in the bathroom using the shower head.
When removing the heat exchanger, be careful not to touch
the lamellae, as they are very fragile. Broken lamellae result
in reduced heat recovery and higher pressure loss through
the heat exchanger (see pictures to the right).
NOTE:
Please note that the temperature sensor on the
exhaust side of the exchanger must be pulled out of the
exchanger before the exchanger can be removed. Remem-
ber to refit the sensor after cleaning the exchanger.
Fans
Check the two fans for dirt (see picture below the housing
containing the fan wheels). If these are dirty, they can be
cleaned with a brush, bottle washer, etc. Remember to
disconnect the power supply to the ventilation unit.
Supply air and outlet valves
Clean the valves by wiping them with a dry cloth. Make sure
the valve does not rotate and thus cause a change in the air
volume.
