Ventilation units with preheating register, sensitive heat exchanger and additional pre-heating

If additional pre-heating is connected upstream (brine EHE, electric heating register) and controlled via the unit control, the pre-heating ensures that the unit remains free of frost.

The pre-heating switches on if the temperature falls below the minimum air inlet temperature (factory setting) + T air inlet offset heating. Should the air inlet temperature fall to the minimum air inlet temperature despite this, the additional preheating register is activated.