Table of Contents
Advertisement
Description
Frost protection monitoring
The ventilation system has frost protection monitoring. Frost protection
monitoring prevents freezing of and thus damage to the heat exchanger. Frost
protection monitoring is active in all operating modes.
The heat exchanger's exhaust air duct may start to freeze due to condensate
formation and sub-zero outdoor temperatures. So the exhaust air duct's cross-
section through the heat exchanger is continuously reduced. As a result, less
heat is transferred to the supply air. This causes a significant drop in supply air
temperature.
The system continuously monitors the supply air temperature. As soon as the
supply air temperature drops too low, the system automatically switches to
frost protection mode.
The supply air fan is switched off in frost protection mode. The exhaust air fan
runs continuously at level 2. It ensures defrosting and drying of the heat
exchanger.
The frost protection ends automatically as soon as the danger to the heat
exchanger has passed. Once frost protection has ended, the ventilation unit
continues to run in the operating mode that was active previously.
Filters
The ventilation unit has two filters for supply air and exhaust air. The filters
have a limited service life and have to be changed regularly. The filters'
service life depends on the volume of air that passes through them and is
therefore dependent on the ventilation unit's operating mode.
The filters have their own data memory. The operating hours and the running
time are stored in this data memory depending on the operating mode.
When the service life of one or both of the filters is almost reached (after 11
months in level 1), 'Filter change necessary' is indicated. However, the
ventilation unit continues to operate normally.
When the service life of one or both of the filters is finally reached (after a total
of 13 months in level 1), 'Filter change mandatory' is indicated. The ventilation
unit can no longer operate.
'Filter change necessary' and 'Filter change mandatory' are indicated by
orange LEDs (see page 10 regarding this matter). The LED closest to the filter
to be changed is displayed slightly darker than the other LEDs. This informs
you which filter needs to be replaced.
Once the filters have been changed, the LED indicator goes out and the
ventilation unit automatically continues in the last operating mode.
Cover for closing the air ducts
A cover is fitted over the fans (under the cover strip). This cover allows the
airways to be closed. Both of the ventilation unit's fans switch off when the
12
Advertisement
Table of Contents
