Configuration Manual

Version Document
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001
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ccess V4.X Configuration manual
31 (56) 2018-07-11
 Yes
Configure: There is no configurations settings, only operation settings on Free cooling
Operation settings: Data & Settings > Demand Control > Free cooling
This function is used during the summer to cool the building night-time using cool
outdoor air, thereby reducing the need for cooling during the day and saving
energy.
Free cooling requires an outdoor sensor (or an inlet temperature sensor) and
either a room sensor or an extract air sensor. The outdoor sensor can be placed in
the fresh air inlet duct. Free cooling is only activated when all the start conditions
are fulfilled.
Start conditions:
• Less than four 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
switch" are Off.
• A timer channel will be On sometime during the recently started 24 hours.
If the outdoor sensor is located in the fresh air inlet duct and/or an extract air
sensor is selected and ALL the start conditions are fulfilled, free cooling is
activated and will run for 3 minutes to ensure that the temperature measurement
when using an extract air sensor reflects the corresponding room temperature and
that the outdoor temperature sensor senses the outdoor temperature even if it is
placed in the fresh air inlet duct. If the outdoor sensor is not located in the fresh air
inlet duct and a room sensor is selected, the unit will not start free cooling as long
as all the temperatures are not within the start and stop temperature intervals.
After three minutes, the stop conditions will be controlled. 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).
• The timer outputs for "normal speed", "Extended running, Normal" or "External
switch" are On.
• It is past 07:00:00 in the day.
If any stop condition 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. An offset can also be entered for the fan setpoints during
free cooling. The digital output ”Free cool run” is active. The outputs Sequences
(temperature) are interlocked. After free cooling has been active, the heating
output is blocked for 60 minutes (configurable time).
Recirculation
Activate: Configuration > Function Configuration > Function Activation
 Yes
 No