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26
| Commissioning
5. Fan control by Airflow l/s.
When settings are done, press ENTER.
Choose System curve.
6. Press RETURN once the system curves has been set and go to Airflow
l/s or m
3
/h.
When settings are done, press ENTER.
7. Fan control by Airflow %
When settings are done, press ENTER.
5.5
Moisture transfer control
Moisture transfer control is activated and adjusted if Exchanger Control setting in service menu is set to
Variable.
A rotating heat exchanger with variable rotor drive is controlled to decrease moisture transfer over to supply air in
buildings with high or periodically high relative humidity. This function has also indirect impact as defrosting function for
the rotor.
If the moisture transfer control is enabled, the lowest regulating signal from temperature and humidity sensors is con-
trolling the rotor drive.
5.6
Defrost level settings
Defrost level settings are active and adjustable if Exchanger Control setting in service menu is set to On/Off.
The unit is equipped with an automatic defrost function that is activated when there is risk of icing in the area around
the heat exchanger. The setting shown in table 2 determines how aggressive the defrosting will be. Default factory de-
frost mode setting is 0.
Note:
The heat exchanger should withstand low outdoor temperatures, but in those cases where icing can occur
please be aware of that the defrost setting will generate an under pressure in the building. Using a fire
place, be aware that there is a possible risk of smoke being extracted into the living areas due to under
pressure if defrosting is activated.
Table 2 Defrost levels
Defrost
Level of humidity
level
0
1
Min
2
Low
3
Medium
Relative humidity
Description
indoors
1
<20%
Defrosting is turned off. Areas where relative humidity
is very low.
20% - 29%
Dry areas, such as warehouse buildings with few
people or industrial buildings that don't use water in
their production process.
30% - 40%
Office buildings
41% - 60%
Apartments or houses with normal humidity
Fan control
Airflow
System curve
SF: 4
EF: 4
EF
Airflow l/s
Nom
26
High
39
Low
14
EF
Airflow %
Nom
66
High
100
Low
33
Note:
This setting is not valid for units equipped with
counter flow heat exchangers when RH sensor
is set not to be used for defrosting.
SF
26
39
14
SF
66
100
33
1
212962 | v02
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