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Clogged filters that are not replaced regularly can cause higher pressure losses, poor air flow, settling of dust
on the fan blades, which changes their characteristic, higher power consumption and higher power of the fan
motors. This results in excessive wear, imbalance of the system and generally improper operation of the heat
recovery system. In an extreme case this may lead to its irreversible damage and impaired functionality of
comfortable ventilation.
Replace the filters in regular intervals!
4.4. Enthalpy exchanger
In the heat recovery unit, an enthalpy counter-current exchanger is installed, which transfers not only heat, but also humi-
dity from the exhausted air, which means that it helps optimize the humidity level in the indoor environment.
4.5. Fans
The heat recovery unit contains two economical fans with an integrated electronic unit and the function of maintaining
a constant air flow.
4.6. Display of the control
The display of the control of the heat recovery unit can be divided into five sections with the set of individual symbols.
Fig. 6 – Display of the control
1 Symbols for the Days of the Week and Error Statuses (Error No. 1 – 9)
2 Symbols for functions of the heat recovery system, Indoor Temperature Setting, Time Schedule and Settings
3 Symbols for temperature values – Temperature IN and Temperature OUT (displayed in °C or °F), Humidity IN, Humidity
OUT (displayed in % rH)
4 Symbols for Switching off, Filters, Too Low Outdoor Temperatures, Warning
5 Symbols for Stand-by, Constant Power and Automatic Mode
4.7. Summer by-bass
The summer bypass consists of a supplementary bypass channel that directs the supplied air around the exchanger, namely
during colder summer nights. This prevents the warm exhausted air from transferring its heat to the colder air from the
outside and heating it up. The by-pass works in the automatic mode and it is controlled depending on the temperature
setpoint. The by-pass is not activated at a lower outdoor temperature than +15 °C, at active Drying, Circulation and Stand-
by. The automatic by-pass function can be enabled or disabled from a mobile application.