CORRIGO VENTILATION 3.6 MANU

Manual Corrigo Ventilation, revision V Chapter 5 Functional description 47
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.
Slave controlled and flow controlled EAF depending on differential
pressure across exchanger
This function enables letting the extract air fan follow the differential pressure across the heat
exchanger. The extract air fan setpoint is calculated as follows: The extract air fan flow setpoint =
Flow across exchanger - (Supply air fan flow setpoint - Extract air fan flow setpoint). The function
works with “Frequency control air flow” and “Frequency control SAF (Pa) with EAF flow control”.
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.