23
Adjusting the valves
At the start of volume flow measurement, make sure that the supply air and extract air valves are
open as wide as possible.
• Set the fans to the nominal air volume flow
• Adjust the valve orifices, throttle valves or throttle foam inserts
• Measure the volume flows at the outlets using a volume flow hood and flow meter (see air volume protocol)
• Readjust the valves
• Lock the valves, shutters and throttles in their adjusted positions
• Record the set air volumes and all other settings in the documentation intended for this purpose
Maintenance and repair by the qualified personnel
If regular maintenance work is not carried out on the FOCUS unit, this will affect the functionality of
the comfort ventilation.
Maintenance and repair by qualified personnel should be carried out by a maintenance service team on the basis of a
maintenance contract. Maintenance and repair of the FOCUS unit includes inspecting and cleaning the fans and heat
exchanger. The heat exchanger should be cleaned based on how dirty it gets but the maintenance interval must not
exceed two years.
Use checklist B to document the maintenance work completed.
Inspection and cleaning of heat exchanger
In doing so, proceed as follows:
1. Disconnect the FOCUS unit from the mains power supply.
2. Press the two snap fasteners A on the bottom of the unit.
Fig. 26: Pressing the snap fasteners
3. Remove the front panel B gradually as indicated by the arrows. To do this, open the front panel at an angle
of no more than 15° and unhook it from the lock seam of the housing.
A
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