Adjusting the supply and extract air flow

Tip:

You can browse the Basic fan settings settings with the Right arrow button.

Important:

Adjust the air flows according to the ventilation plan. First, set the valves to the correct adjustment positions. Next, set the fans as close to the optimal value as possible by consulting the fan diagram. You can use the gauge fittings connected to the unit or delivered with the unit when adjusting the total air flow of the system. Then, measure and adjust the air flows from the valves. Try to adjust the air flows without choking them with the valves. This makes the solution as quiet and energy-efficient as possible.

If the output 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.

Important:
If the ventilation unit has been set up before adjusting the air flows, we recommend you measure the air flows through the air volume adjustment menu (see Air volume adjustment under Save and restore settings.). This optimises the unit settings for air volume adjustment.
Note:
If the outdoor air is very cold (aluminium unit: below -10°C; plastic unit: under -3°C), the ventilation unit may have to defrost the HR cell. In that case, the air flows cannot be adjusted and the control panel displays the Defrosting icon.


When you want to adjust the supply and extract air flows:

  1. Select Basic fan settings
  2. 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.
  3. Measure and adjust the supply air flows from the valves.
  4. Select Right arrow.
  5. 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.
  6. Measure and adjust the extract air flows from the valves.
  7. Select OK.
    Supply and extract air flow settings are now complete.
  8. Record the set percentages in the measurement log.