Frost Protection
At other times the unit will recover heat as long as the related dip switch in the control box is
activated.
The bypass function is activated from “dip
switch 3” in the control box on top of the
unit.
This can be switched off in the heating
season to have heat recovery at all times.
In case of very low outside temperatures, the supply fan will reduce its speed automatically for a
short period to protect the heat exchanger from freezing. This function is active when the outdoor
air temperature falls below -3°C. Set temperature value is changeable.
For uninterrupted air supply and extract volumes in regions with low outside temperatures
(< -5°C for more than 24 hours), an in-line electric pre-heater (see section 11) can be used in the
supply air stream from the outside to the dwelling to avoid the heat exchanger freezing. The
heater automatically switches on when the outdoor air temperature falls below 0°C.
Once installed, the pre-heater control must be activated from “dip switch 2” in the
control box on top of the unit.
Filter Maintenance Indicator
The unit is fitted with a maintenance reminder facility which has been pre-set to 4 months. When
this time interval is reached the red warning light on the control panel flashes for filter
maintenance indication. After filter cleaning/replacing is done, filter setting time can be reset by
pressing simultaneously, hold and during reset time that appears on screen. When
countdown is over, press on Pro Panel.
Alternatively, optional pressure sensors (see section 11) can be used to measure the actual
pressure difference between supply and exhaust air hence monitor the filter status. The red
warning light on the control panel flashes as soon as the filters need to be maintained.
After cleaning/replacing the filters, the red warning light goes off automatically.
Electric Post-heater
For most of the year, heat recovered from the extracted air is sufficient to warm the fresh
incoming air to the required temperature. If the heat gain from the extract air is not sufficient an
optional post-heater (see section 11) can be used to increase the indoor air temperature.
The heater is switched on/off automatically based on the extract air temperature in order to
maintain the requested indoor air temperature (factory set at 22°C).
Once installed, the post-heater control must be activated from the “dip switch 1” in
the control box on top of the unit.
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