Maintenance and repair by qualified personnel 3.5
If regular maintenance work is not performed at the FOCUS, this impairs the functioning of
the comfort ventilation.
The maintenance and repair by qualified personnel should only be carried out by a maintenance service
on the basis of a maintenance contract. The maintenance and repair measures for the FOCUS include
the inspection and cleaning of the fans and the heat exchanger. Cleaning of the heat exchanger is carried
out depending on the degree of soiling; the maintenance interval should not exceed two years.
The maintenance work performed must be documented in check list B!
Inspecting and cleaning the heat exchanger 3.5.1
In order to do so, proceed as follows:
1. Disconnect the FOCUS from the power supply.
2. Press both spring locks A on the bottom side and unlock with it the front plate.
Fig 26: Press of the spring locks
3. Remove the front plate B according the step sequence 1. and 2. and gradually to the directions of
the arrows. Open the front plate in a corner from maximally 15 ° and hang them from the tin fold of
the housing.
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