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Maintenance
Even if the required maintenance is carried out, dust will
build up in the exchanger block. It is therefore of vital im-
portance for the upkeep of a high efficiency that the ex-
changer block is removed from the unit and cleaned
periodically as described below. Clean the heat exchanger
at least every 3 years or when required.
1. Stop the unit by disconnecting the mains.
2. Open the side cover. See chapter 4.2.
3. Release the bracket that holds the heat exchanger.
4. Pull out the exchanger using the strap at the front.
5. Clean the heat exchanger with hot soapy water. It is al-
so possible to use pressure air, but not with too high
pressure.
6. Remount the heat exchanger.
7. Close and fasten the side cover and connect the unit to
mains.
4.5 To clean fans
Danger
• Make sure that the mains supply to the unit is disconnected before performing any maintenance or
electrical work!
Warning
• Risk of injury due to rotating parts that have not come to a complete standstill after mains supply to the
unit have been disconnected.
Warning
• Beware of sharp edges during mounting and maintenance. Use protective gloves.
The motor bearings are life time lubricated and mainte-
nance free.
Even if the required maintenance, such as changing of fil-
ters is carried out, dust and grease may slowly build up in-
side the fans. This will reduce the efficiency.
1. Remove knobs that hold fans in place.
2. Disconnect the fan power cables. The cables are found
beside the fans.
3. Pull out the fans towards you. Some force may be
needed.
4. Clean the fans with a cloth or a soft brush. Do not use
water. White spirit can be used to remove obstinate
deposits. Allow the fans to dry properly before
remounting.
5. Remount the fans. Don’t forget to reconnect the fan
power cables.
6. Close and fasten the side cover and connect the unit to
mains.
4.6 Duct System Maintenance
4.6.1 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
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