Adjusting the supply and extract air flows

First, set both values as close to the ideal value as possible by looking at the supply and extract air fan curves. If the ratio between the air flows is very high at first, the ventilation unit may have to carry out extra defrosting cycles in sub-zero temperatures, thus making adjustment of the air flows more complicated. Check the air flows by measuring them at the valves, and fine-tune the percentage values as required.

Note: If the outside air is extremely cold (below -10°C on an aluminium cell or below -3°C on a plastic cell), the ventilation unit may have to defrost the heat recovery cell. The air flows cannot be adjusted during defrosting.

Attention: The supply and extract air settings have been completed by a specialist during setup of the ventilation unit. These settings should be changed only when the ventilation unit is reconfigured, and not at any other time. Changing the ventilation settings so that overpressure is created can result in damage to the structures of the building.

Use the Plus and Minus buttons to set the supply air fan ratio as a percentage of the maximum output ratio. The fan speed (rpm) will change accordingly.
Measure and adjust the supply air flows from the valves.
Press the OK button .
Use the Plus and Minus buttons to set the extract air fan ratio as a percentage of the maximum output ratio. The fan speed (rpm) will change accordingly. Measure and adjust the extract air flows from the valves.
Select OK. Supply and extract air flow settings are now complete.
Record the set percentages in the measurement log. Do not change the output ratio between the supply and extract air fans once the settings are complete. The same ratio is also used in the Away and Boost modes.

Note: If the use of the ventilation unit was started before airflow adjustment, the airflow must be measured through the Setup menu (see “Save and restore settings”). This ensures that the unit settings are optimal for the adjustment of the airflows.