GB Maintenance
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6.2 Changing Outdoor/Extract air filters
The filters cannot be cleaned and must be changed as necessary. This is normally done 1–2 times per year depending
on the air pollution at the installation site.
The factory installed filters are of filter quality G4/ISO Coarse 65% for the supply air and G4/ISO Coarse 65% for the ex-
tract air filter. The filters need to be replaced when polluted. New sets of filters can be acquired from your installer or
wholesaler.
Fig. 2 Changing of filters
Filter quality F7/ePM1 60% can be installed for supply air
filtering.
The filter type is labelled on the top of the filter
When it’s time to change the filters an alarm is shown in
the control panel display. When this occurs do the
following:
1. Change filters as shown in below illustration (figure 2).
2. Reset the filter time as described below (chapter
6.2.1). Depending on the condition of the filter, you
might need to change the operation time for the filter.
6.2.1 Resetting the filter time
Once filter is changed, it is necessary to reset filter time. Go to Filter menu (see 5.4 Menu overview, page 7, pos. E)
or if filter alarm is present, click on alarm status line (see 5.5 Home screen, page 8, pos. 5) and select filter alarm. Select
CHANGE FILTER, in the pop up menu define a new filter period and press OK to confirm selection.
Filter time is now reset.
6.3 Checking the heat exchanger
Fig. 3 Removing and cleaning the heat exchanger
Even if the required maintenance is carried out (chapter
6.2), dust will build up in the exchanger block. It is there-
fore of vital importance for the upkeep of a high effi-
ciency that the exchanger block is removed from the unit
and cleaned periodically as illustrated below (figure 3).
Cleaning the heat exchanger can be done every 3 years.
6.4 Cleaning the fans
Even if the required maintenance, such as changing of filters is carried out, dust and grease may slowly build up inside
the fans. This will reduce the efficiency.
The fans may be cleaned as illustrated in below procedure.
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