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MAINTENANCE INSTRUCTIONS
C
D
T
J
I
E
VALLOX 90K 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 the heat recovery cell
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.
VALLOX 90K SC
3. MAINTENANCE INSTRUCTIONS
3.1. Before starting maintenance operations
Though opening the door of the VALLOX 90K SC unit causes the safety switch (T) to switch
the unit off, please also remove the fuse of the unit from the main fuse panel. If the unit is
equipped with a preheating resistor, bear in mind that the PTC resistor used as the preheating
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 G3 class
coarse filter (C) filters off insects, heavy pollen and other dust. An F7 class fine filter (E) filters
off fine, invisible dust. Extract air is filtered with a G3 class coarse filter (D). Clean 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 G3 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 water has drained off from between the laminas, you can put the HR
cell back in place. Finally, push the sealing ledge in place.
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