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9.7 Summer cassette (option)
The heat exchanger is replaced with the
summer cassette during the summer months,
e.g. when an earth heat exchanger is
installed upstream.
When operating with the summer cassette,
the outside air is fed into the rooms via the
supply air channel. There is no heat transfer
between the exhaust air and supply air.
Replacing cassettes
Switch off the mains fuse at the fuse box.
Position a visible warning notice at the fuse
box to avoid the unit being accidentally
switched back on.
Release the 2 quick-release clips and open
the front shutter.
Remove the front cover (6 screws).
Pull the heat exchanger carefully out of the
ventilation unit. To do this, pull with one
hand using the pull strap [1] while
supporting yourself on the ventilation unit
with the other hand.
Do not damage the sealing
NOTICE
strip when pulling the heat
exchanger out or pushing it
back in.
Do not move the ventilation
unit, especially if it is wall-
mounted.
Make sure that the heat
exchanger doesn't twist
as it is pulled out.
Now carefully slide the summer cassette
into the housing as far as it will go (see the
sticker on the front side, that indicates the
position).
Fix the front cover in place (6 screws).
Fold the front shutter back up. Lock it in
place with the two quick-release clips.
Switch the main fuse on and then switch on
the ventilation unit at the room air control.
Following the same sequence when
i
reinstalling.
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