Manual Corrigo E Ventilation, revision M
Chapter 5
Functional description
38
Alarms
An alarm is activated if the efficiency falls below the set alarm level (50%).
Inputs and outputs
AI
Outdoor temperature sensor
AI
Exhaust air sensor
AI
Extract air temperature sensor
5.1.10 External setpoint
An external setpoint device, for example TBI-PT1000 or TG-R4/PT1000 can be connected. The
setpoint device must follow the PT1000 resistance curve. The unit is connected to the analogue
input signal ”Extra sensor”. The function must be activated in the menu ”Configuration/External
setpoint”. The setting range can be min/max limited via a setting in the controller. The factory
setting is min: +12, max: +30.
Inputs and outputs
AI
Extra sensor
5.1.11 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.
Recirculation is activated either via a digital input signal or by connecting it to Timer output 5. If
timer output for normal/reduced speed is activated during recirculation via Timer output 5,
normal/reduced speed gets priority. If timer output for normal/reduced speed is activated during
recirculation via a digital input, recirculation gets priority.
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 has its own setpoint. However, 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.
To lower the temperature, it is possible to configure free cooling to be used during recirculation, if
the conditions for free cooling are fulfilled. Then, the recirculation damper closes, the supply and
extract air dampers open and the extract air fan starts (the supply air fan also starts, if it is not
already running). If the free cooling function is not configured for recirculation control and you
want to cool down the supply air via a low recirculation setpoint, the cooling battery will be used. A
max. room temperature can be configured for recirculation control. If the room temperature rises
above the set value (FS 25°C), recirculation will be stopped. When the room temperature has fallen
1 K below the set max limit, recirculation will start again if the start conditions are still fulfilled.
When running frequency controlled fans and using recirculation control you can, depending on the
type of fan control, configure a special pressure/flow offset for the setpoint or a manual output
signal for the supply air fan.
5.1.12 Change-over
Change-over is a function for installations with 2-pipe systems. It makes it possible to use the same
pipe for both heating and cooling, depending on whether heating or cooling is required.
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