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2.1.5
Filters
2 filters in Z design of the filter class G4 are installed in the device. They consist of a synthetic filter mat
in a polypropylene frame. A pollen filter of the filter class F7 can be used as supply air filter.
2.1.6
Frost Protection
The focus is equipped with automatic frost protection which prevents that the heat exchanger freezes at
very low outside air temperatures. The fans will be temporarily deactivated if the intake air temperature or
the supply air temperature of the device falls below the threshold value.
2.1.7
Common Operation with fireplaces
The installer has to comply with the corresponding standards and regulations in case of synchronous
operation with fireplaces, e.g. fireplace. The common operation of heat-producing appliances and
ventilation systems dependent on the indoor air requires a suitable safety device (differential pressure
switch) or a plant-specific device, when a dangerous negative pressure builds up in the installation room
of the heat-producing appliance during the operation. The focus is prepared for the common operation
with fireplaces.
2.2
Available Control Units
The focus can be equipped with the following control units:
• LED control panel
• TFT Touchpanel
• Boost ventilation switch
2.2.1
LED Control Panel
Key - supply air and extract air mode
Key – only extract air mode
Key – only supply air mode
Key – fan speed down
Key - fan speed up
Key - boost ventilation
Reset key – filter change period
Figure 2: Key assignment for LED control panel
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