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4.6.1
Temporary belt repair solution
In case both welded belts break it is possible to use joint nipple as a temporarily quick repair solution until the welded
belt can be replaced with a new one. Depending of how the unit is installed, it may be not necessary to remove the
heat exchanger package in order to temporary repair a broken drive belt if the belt pulley can be accessed.
4.7
Duct System Maintenance
4.7.1
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.
4.7.2
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.
4.7.3
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.
4.7.4
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.
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