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MAINTENANCE INSTRUCTIONS
C
D
T
K
I
E
VALLOX 90 SC filters and heat recovery cell. The units
are available in right and left handed models. In the
right handed model (model R) outdoor air comes to
the unit from the right side of the centre line as shown
in the instructions. In the left handed model (model
L) outdoor air comes from the left side of the unit.
The filters and the summer / winter damper change
places correspondingly.
Detaching of heat recovery element
First remove the sealing ledge located above
the cell. Slowly pull the cell from behind the
cell about half way outwards and lift it out of
the unit.
J
VALLOX 90 SC
3. MAINTENANCE INSTRUCTIONS
3.1. Before starting maintenance operations
When you open the door of the VALLOX 90 SC unit, the safety switch (T) switches the unit
off; in spite of that, please remove the fuse of the unit from the main fuse panel. If the unit
is equipped with a preheating (G) or a post-heating resistor (K), please bear in mind that
the PTC resistor used as the heating resistor is a live component. Because of this you have
to make sure that the unit has no voltage.
3.2. Filters
When the maintenance reminder lights up the control panel indicator, the cleanliness of the
filters must be checked. Outdoor air is filtered in the unit with two kinds of filters. A G4 class
G
coarse filter (C) filters off insects, heavy pollen and other dust. An F7 class fine filter (E) filters
off invisible dust. Extract air is filtered with a G4 class coarse filter (D). Clean the coarse filters
D and C by washing them at least twice a year. Wash the filters with +25...30°C warm water and
washing-up liquid, pressing them smoothly. Do not handle the filters with force. When
washing is done properly, filters stand cleaning 3 to 4 times. In other words, you have to
replace them at least every two years.
The fine filter (E) is not washable. Clean it at the same time as the G4 class filters by
vacuuming it with a brush nozzle. When cleaning, be careful no to break filter material.
To ensure good supply air quality, replace the filter preferably every year, and at least every two years
depending on local air quality. It is recommended to replace filters in autumn. This way the
filters stay cleaner through the winter and can effectively filter off dust in the following spring.
In connection with the cleaning of the filters it is also advisable to check the cleanliness of
the heat recovery (HR) cell (I) at about two-year intervals. The sealing ledge (J) above the
HR cell must be torn off before it is possible to start removing the cell. When the sealing
ledge has been removed, the HR cell can be pulled out of the unit. Note! The laminas of the HR
cell are very thin and get easily damaged. The correct way to remove the HR cell is to put your
hands behind the HR cell and slowly pull the cell outward. If the HR cell is dirty, soak it in
a solution of water and washing-up liquid. Rinse the HR cell clean with a jet of water. When
all the water has drained off from between the laminas, you can put the HR cell back in
place. Finally, push the sealing ledge in place.
6
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