7
L8000013 –
Maintenance instructions for Duco Ventilation systems
D. Central extract unit
D.1 Maintenance frequency
• Before (possibly) proceeding to clean your extract unit, as a resident, you need to inspect it to establish whether it is
necessary�
• Your central extract unit needs to be cleaned by an accredited installer�
• In a newbuild home, the DucoBox needs to be cleaned completely, i�e� including Box Sensors and Control Valves (if
present), after 6 months�
• After these 6 months, you will need to repeat this operation every 3 – 4 years, depending on the degree of fouling�
• If the central extract unit is used in combination with a cooker hood, then maintenance will be required more frequently
than indicated above� This will require additional maintenance, such as cleaning / replacing filters, the motor and the
Box Sensors plus Control Valves, if present�
• Technical maintenance of the DucoBox is not necessary�
D.2 How to carry out check-ups
1� Isolate the DucoBox�
2� Open the cover�
3� Unclip the extract unit plate in 4 places by releasing the 4 snap-ins with a flat screwdriver�
4� Do not touch the internal electronics�
5� The extract unit plate can then be removed from the casing�
6� Check the impeller for contamination� A small amount of fouling has little effect on the extract unit's performance� If the
fouling is more than 1 mm thick on the inside of the blades, we advise you to have them cleaned�
7� Check the bearings� You can do this by turning the impeller by hand�
8� Check the bearings for noise�
9� Check that the fan is not swinging�
10� When the fan is set in motion by hand, it only makes a few revolutions and then comes to a standstill with some jerks�
This is a characteristic of a DC extract unit and is therefore entirely normal�
11� Depending on the outcome of the inspection, the extract unit will need to be cleaned and/or prepared for use�
12� Clip the extract unit plate back into the casing�
13� Check to ensure it is positioned correctly and press hard�
14� Close the cover� Press well on the 4 corners�
15� Put the DucoBox under tension again�
