Service and maintenance
Bypass function
When the current room temperature is above the desired temperature, there is no further need for
heat recovery. In this situation, the bypass opens and diverts the outdoor air round the heat
exchanger, preventing the latter from being heated by the indoor air. This results in lower internal
pressure in the unit, thereby saving energy on fan operation.
The unit has a 100% bypass, which means that as well as diversion of the outdoor air round the heat
exchanger, a damper closes off the heat exchanger, preventing any outdoor air from passing through
it.
Humidity control
As standard, the unit is fitted with intelligent humidity control, which automatically adjusts to the
needs of the family or building.
By means of the integral humidity sensor, the control system calculates the average value for the past
24 hours. The average value is consulted when deciding whether to change the air change rate in the
event of a fluctuation in the air humidity in the extract air, and at the same time it adjusts to the air
humidity levels in summer and winter.
If the air humidity rises by more than 5-10% (summer/winter), forced ventilation is activated in order
to expel the humidity as quickly as possible. If the average air humidity falls below the set value for low
humidity (default value 30%), the unit will operate at a reduced level with a lower air change rate, in
order not to dry out the home even further.
This automatic humidity control helps to save energy on operation, and to ensure satisfactory comfort
in the home.
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