4
Function principle
The unit is designed to change the air in a room to ensure a better indoor climate. The TX 75A has
two fans which blow the same amount of air in as is extracted via a heat exchanger. The heat
exchanger is designed to heat cold outdoor air by transferring the heat from extracted air to the
intake air, reducing heat loss by approx. 85%. The heat exchanger can also be used to cool intake
air if the outdoor temperature is higher than the room temperature.
The air volume can be adjusted using a CO
2
sensor (optional extra) to ensure the level of air change
is in line with activity in the room.
Figure 1 - Function principle
Outdoor air is sucked in by the intake motor and blown through the intake filter. The air then passes
through the heat exchanger and out via the intake grille into the room.
Room air is sucked out by the extraction motor through the extraction grille. It is then blown
through the filter and heat exchanger into the open air.
Extraction grille
Intake grille
Extraction motor
Heat exchanger
Filter
Intake motor
Filter
