46
Functional description
Manual Corrigo E Ventilation, revision Q
Regulator-
utsignal
Y1
Y2
Y3
Utsignal
0%
100%
Kompensation vid
kylbehov
Kompensation vid
värmebehov
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 controls 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 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.
Output signal
Cooling demand
compensation
Heating demand
compensation
Controller
output
100 units
100 units