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Duct system maintenance GB
7 Duct system maintenance
7.1 Cleaning extract louvres and supply air diffusers
The system supplies fresh air to your home and extracts the used indoor air via the duct system and diffusers/louvres.
Diffusers and louvres are mounted in ceilings/walls in bedrooms, living room, wet rooms, WC etc. Remove diffusers
and louvres and wash in hot soapy water as required (diffusers/louvres must not be exchanged). Cleaning of diffusers/
louvres can be done as necessary.
7.2 Checking the outdoor air intake
Leaves and pollution could plug up the air intake grille and reduce the capacity. Check the air intake grille, and clean as
necessary. It is recommended to do this at least twice a year.
7.3 Checking the roof cowl (if fitted)
The roof cowl (if fitted) connected to the exhaust air duct needs to be checked at least twice a year and cleaned if
necessary.
7.4 Checking and cleaning the duct system
Dust and grease deposits may build up in the duct system, even if required maintenance such as changing of filters is
being carried out. This will reduce the efficiency of the installation.
The duct runs should therefore be cleaned/changed when necessary. Steel ducts can be cleaned by pulling a brush
soaked in hot soapy water through the duct via diffuser/louvre openings or special inspection hatches in the duct sys-
tem (if fitted).
It is recommended to do this every 5 years and is normally carried out by authorized companies specialized in this area.
8 Troubleshooting
If problems should occur, please check the items below before calling your service representative.
Malfunction
Action
Fans do not start
1. Check the HMI for alarms.
2. Check that all fuses and fast couplings are connected (main power supply and fast
couplings for supply and extract air fans).
3. Check that the week schedule is ON and running in AUTO mode. The week schedule
might be in OFF mode with the air flow set to OFF (chapter 5.7).
Reduced airflow
1. Check the HMI for alarms. Some alarms can reduce the airflow to LOW if active.
2. The unit could be in defrost mode. This reduces the fan speed and in some cases shuts
down the supply air fan completely during the defrosting cycle. The fans go back to
normal after finished defrosting. There should be a defrosting function icon visible in the
APP or HMI home screen if defrosting is active.
3. If the outdoor air temperature is below 0°C (Outdoor air temperature sensor (OAT)
measures < 0°C) outdoor airflow compensation function can be active (if enabled). Fan
speed (Supply or Supply/Extract air fans) is linearly reduced for decreasing outdoor air
temperature.
4. Check if temporary user mode that reduces airflow is not activated, for example AWAY,
HOLIDAY, etc. Also check digital inputs CENTRAL VACUUM CLEANER and COOKER HOOD.
5. Check setting of airflow in the HMI.
6. Check week schedule settings (chapter 5.7).
7. Check filters. Is change of filters required?
8. Check diffusers/louvres. Is cleaning of diffusers/louvres required?
9. Check fans and heat exchange block. Is cleaning required?
10.Check if the buildings air intake and roof unit (exhaust) have been clogged.
11.Check visible duct runs for damage and/or build up of dust/pollution.
12.Check diffuser/louvre openings.
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