Special excess humidity protection function for KBET variants

Special excess humidity protection function for KBET units with enthalpy heat exchanger, bypass and preheating register.

If the relative humidity limit value max is not undershot within 48 hours, the bypass opens and the supply air is heated with the preheating register. If the value then falls below the limit value, the ventilation unit switches back to the last ventilation level used. The bypass closes and the preheating register switches off.