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Chapter 5
Functional description
Manual Corrigo Ventilation, revision R
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 EAF with SAF slave
The rotational speed of the extract air fan is controlled by a pressure transmitter which is placed in
the extract air duct. The supply air fan has no pressure transmitter. Instead, the supply air fan output
is made to follow the extract air fan control signal. A scaling factor can be added if the supply air
fan characteristics are not the same as the characteristics of the extract air fan (only pressure control
of the extract air fan is possible using this function).
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.
Frequency control EAF with flow control SAF
The rotational speed of the extract air fan is controlled by a pressure transmitter which is placed in
the extract air duct. The supply air fan is controlled by the extract air duct flow in order to achieve a
balanced ventilation. A pressure transmitter placed in the extract air fan cone (“Extra SAF
Pressure”) provides a measurement of the current extract air flow. A corresponding pressure
transmitter is placed in the supply air fan cone, providing a measurement of the supply air flow.
The supply air fan is controlled using the extract air flow as a setpoint. A scaling factor can be
added if the supply air fan does not have the same characteristics as the extract air fan.
Frequency control SAF and EAF with external flow setpoint
This signal can be used to control the SAF and EAF flow setpoints from an external VAV system if
the ”Frequency control external” fan type is used.
If this signal is configured as an analogue input signal, the flow setpoint for the SAF and EAF will
be controlled in normal speed.
The signal can be configured by using scaling: Min volt input (Vmin)/Min flow and Max volt input
(Vmax)/Max flow.
Minimum limit
For frequency controlled fans an adjustable minimum limit can be set individually on the supply air
and extract air fan control signals.
In- and outputs