Ventilation units without preheating register

If the outgoing air temperature falls to the set value T outgoing air min. (fixed factory setting), the supply air fan switches off (regardless of heat exchanger type). If further exhaust air causes the outgoing air temperature to increase again (set increase in temperature in outgoing air, fixed factory setting), the supply air fan switches on again.

If using another upstream, controlled form of pre-heating (brine EHE, electrical pre-heating), the pre-heating is used to keep the unit free of frost. Should the outgoing air temperature fall below the set T outgoing air min. despite this, the ventilation unit switches to fault after a short delay time.