Sauter flexotron®800
ventilation
Functional description
P100012082
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The outdoor compensation is linear and is set using two parameter pairs which give the
value of the compensation at two different outdoor temperatures. The compensation
can be positive or negative.
The outdoor compensation is set in the menu "Actual/Setpoint".
Using CASE flexotron®, you can also choose to only outdoor compensate the flow of
the supply air fan. In that case, the extract air fan is controlled using constant flow,
independent of the outdoor temperature.
Extra compensation curve
As a complement to the above outdoor compensation, there is a function called
’’Extra
compensation curve
’’ which can be used to set a compensation based on the room,
extract air or supply air temperature. The curve has three parameter pairs which
correspond to the value of the compensation at three different temperatures.
Frequency control manual
Frequency controlled fans can be controlled at a fixed rotational speed. The rotational
speed is selected by setting a fixed output signal (0 --- 100%). Values for normal and
reduced speed can be configured for each fan.
Fans that are run with a fixed output signal can also be compensated (see the section
above). In this mode, pressure sensors are not needed.
Frequency control external control signal
Two 0…10 V input signals are used for direct control of frequency controlled fans. The
signal is received from e.g. a VAV unit. The signal control
s the fans 0…100% (0…10 V
on the analogue output). Pressure transmitters are not used in this control mode.
Frequency control SAF with EAF slave
The rotational speed of the supply air fan is controlled by a pressure transmitter which
is placed in the supply air duct. The extract air fan does not have a pressure
transmitter, instead you let the output for the extract air fan follow the control signal for
the supply air fan. A scaling factor can be added if the characteristics of the extract air
fan are not the same as the characteristics of the supply air fan. (Only pressure control
of the supply air fan is possible using this function.) The extract air fan will start directly
at 50% after the start delay. Then the heating of the exchanger will work for this
operating mode as well. When the supply air fan starts, the extract air fan will be slave
controlled by the supply air flow.
Frequency control SAF with flow control EAF
The rotational speed of the supply air fan is controlled by a pressure transmitter which
is placed in the supply air duct. The extract air fan is controlled by the supply air flow, in
order to achieve a balanced ventilation. A pressure transmitter which is placed in the
supply air fan cone ("Pressure transmitter SAF 2") gives a measured value of the
present supply air flow. A corresponding pressure transmitter is placed in the extract air
fan cone and gives a measured value of the extract air flow.
The supply air flow is the setpoint used for control of the extract air fan. A scaling factor
can be added if the extract air fan does not have the same characteristics as the supply
air fan.
