Commissioning
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21
Main menu item
Sub-menu item 1 Sub-menu item 2 Explanations
→ Log off Log off?
No
Actual level:None
Log off from Administrator level by
changing Noto Yes with the "OK"
and "UP/DOWN" buttons
Automatic logoff after 6 minutes of
inactivity.
→ Change password Change password for
level:None
New password xxxx
Set a new password for the level of
your choice.
Can only be done once logged on
to the service level.
4.4 Free cooling description
This function is used during the warm period to save energy by using cold outdoor air, e.g. during night time, to cool
down the building and thereby reducing the need for cooling during the day time.
Note:
The following is only valid if the free cooling function is set to Active in the program menu.
Free cooling is only activated when the following starting conditions are met.
Starting conditions:
• Less than 4 days have passed since the unit was last in running mode
• The outdoor temperature during the previous running period exceeded a set limit (+22°C)
• It is between 00:00 and 07:00:00 in the day (settable)
• The timer outputs for normal speed, Extended running normal and External stop are Off
• A time channel will be On sometime during the recently started 24 hours.
The unit checks the night temperature (indoor and outdoor temperature) during 3 minutes at the set starting hour when
the fans are started so that the sensors can perform a temperature measurement. If above conditions are met the free
cooling function is started, if not the unit goes back to OFF position.
If the outdoor sensor is not located in the outdoor air inlet duct and a room sensor has been selected, the unit will not
start free cooling as long as all the temperatures are not within the start and stop temperature intervals.
Stop conditions:
• Outdoor temp above the set max value (+18°C) or below the set min value (condensation risk, +10°C)
• The room temp/extract air temp is below the set stop value (+18°C)
• One of the timer outputs for normal speed, External stop or Extended running normal is On
• The time has past 07:00:00.
If any stop conditions is fulfilled after three minutes, the unit will stop again. Otherwise, operation will continue until a
stop condition is fulfilled.
When free cooling is active, the fans run at normal speed or the set value for pressure/flow control and the digital out-
put Free cooling is active. The outputs Y1-Heating, Y2-Heat exchanger and Y3-Cooling are shut down.
After free cooling has been activated, the heating output is blocked for 60 minutes (configurable time). When using free
cooling, an offset to normal fan control setpoint is adjustable.
124455 | A003
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