Section 6 – Control and Service menu
Jumper L13 installed : safety function disabled
Jumper L13 removed : safety function enabled
Fig. 6.12A Display circuit board with jumper L13
Fig. 6.12B Display circuit board without jumper L13
6.5.2 Frost protection of the heat exchanger
When the outdoor temperatures are very low and the property is left unheated, a frost protection function
will operate in order to prevent freezing of the heat exchanger.
Frost protection of the heat exchanger is activated when the temp. inside the property drops below 3°C.
Automatic frost protection method :
Flue not used (Jumper L13 installed): Supply fan is switched off for between 15 – 30 minutes.
Flue in use (Jumper L13 removed): Bypass shutter is opened for between 15 – 30 minutes.
Note: The frost protection time of between 15 – 30 minutes depends on the Room temperature.
During Frost protection of the heat exchanger, the display will read Cool Down Protection.
NOTE!
In order to enable setting up, this function is not
available for 60min after energizing the ventilation
unit.
NOTE!
With L13 removed: During defrosting, heat recovery is disabled and cold Fresh air flows directly
into the rooms. The installation of a Defrost heater in the Fresh air duct is recommended to
prevent ice build-up.
6.5.3 Frost protection of the property
If the Supply air temperature drops below 8°C the whole unit will automatically switch off, in order to protect
the property from frost damage. The unit will remain off for 60 mins so that room temperatures can recover.
The unit will automatically switch on again when the Supply air temp. is above 9°C.
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