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S4 R/S7 R
19 Cleaning - Maintenance S4 R/S7 R
Before opening the door of the heat recovery system or carrying out maintenance on the kitchen
hood: switch off the heat, let the fans continue for three minutes to remove hot air, remove the
power from the unit and wait 2 minutes before opening the doors.
Doors: Opened by unscrewing the two screws in one door.
Fans: Item nos. 5 and 6/Chap. 9 General Drawings. The fans must be cleaned once pr. year. The fans are
cleaned with a small brush and compressed air, if available. NB! Do not use water. Disassemble as
follows: Open the doors as directed. Pull out the electric quick-release contact for the motor. Unscrew
2 screws under the front edge of the motor’s mounting plate. The fan can then be carefully pulled down
and out of the unit.
Filters: To preserve a healthy indoor environment, it is important to change filters when they are dirty. Dirty
filters lead to:
Increased air resistance in the filter – less air in the home – the risk of bacterial growth in the
filter – in the worst case scenario, the system can be damaged.
How often the filters need to be changed depends on the degree of contamination of the air where they
are installed. In general, the filters need to be changed once a year, preferably in the autumn (after the
pollen season). In areas with a lot of dust and contamination, the filters should be changed in the spring
and autumn. The supply air filter and extract air filter (2 and 1) consist of an EU 3 prefilter on top (coarse
filter) and a compact filter (EU7). They are pushed into place and fastened with filter tighteners.
It is recommended that you order a filter subscription to ensure full benefit from the system and the
cheapest prices.
Order no. for a complete set of filters: 12327
When changing filter, please perform an overall check of the ventilation unit.
Rotor: As the system has filters installed with a high tightness class, it is not normally necessary to clean
the rotor. If, for various reasons, it should still be necessary, dust can be removed with a soft brush.
Further cleaning is possible if you remove the rotor, spray it with fat-soluble detergent and then blow
it clean from the opposite side. Distance approximately 60mm and max. pressure 80 bar. Ensure that
the motor is not exposed to water during cleaning. Ensure that all seals around the rotor are intact
and tight.
Do not use detergent that is harmful to aluminium or the environment.
Valves and
duct system: Clean the valves at least once a year. The duct system must be cleaned at least every 10 years.
Outdoor air
intake: Check once a year that the grille is not clogged.
Roof hat: Check once a year that the drainage gap at the bottom is not clogged with leaves. This applies only if
the system has a roof hat.
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