Sauter flexotron®800
ventilation
Configuration
P100012082
94
16.24 Recirculation
Recirculation is a function for distributing the air in the room using the supply air fan.
The function can be used even when there is no heating or cooling demand. When
using recirculation control, the extract air fan stops and a recirculation damper opens
which allows the air to circulate through the unit.
Enable temp control
when recirculation:
No
Recirculation control can be configured as either air circulation (temperature control
inactive) or air circulation with temperature control. (Only heating, only cooling or both
heating and cooling.) Recirculation control can either have a unique setpoint or follow
the supply air setpoint, with an adjustable offset. The other settings are the same as for
normal operation, i.e. if normal operation has been configured as room control, room
control will also be used during recirculation.
End recirculation
control when room
temp. exceeds:
25.0°C
If the room temperature rises above the set limit value, recirculation will be stopped.
Enable free cool
when recirculation:
No
To lower the temperature, it is possible to configure free cooling to be used during
recirculation, if the conditions for free cooling are fulfilled.
Use extra time
group 5 to start
recirculation: No
Recirculation is activated either via a digital input signal or by connecting it to "Timer
output 5".
16.25 Pretreatment
Control of dampers and pump for preheated or pre-cooled outdoor air via an
underground intake channel. The digital output
’’Pretreatment’’ is set to preheating
when the unit is started and the outdoor temperature is below the set heating start limit
(default 8°C) or to precooling when the outdoor temperature is above the set cooling
start limit (default 19°C).
If the outdoor temperature exceeds the set heating start limit by more than 1°C (fixed),
preheating will be aborted, as well as if the outdoor temperature falls below the cooling
start limit by 1°C.
If a sensor is configured in the intake duct (
’’intaketemp’’) this temperature will be
compared with the outdoor temperature. If the temperature in the intake duct does not
exceed the outdoor temperature by more than 1°C (adjustable) 5 minutes (fixed) after
start-up when using preheating, preheating will be aborted. The same conditions apply
to precooling, i.e. if the intake temperature is not more than 1°C (adjustable) cooler than
the outdoor temperature, precooling will be aborted.
Pretreatment always starts at start-up of the unit, if the outdoor temperature so permits.
If pretreatment is aborted due to a small difference between the intake temperature and
