CORRIGO VENTILATION 3.6 MANU

98 Chapter 17 Configuration Manual Corrigo Ventilation, revision V
17.25.3 Step controllers Change-over
The digital output signals "Heating/cooling step 1", "Heating/cooling step 2" and "Heating/cooling
step 3" are used for step controllers during Change-over control (see section 5.1.12). They have the
same functions as other step controller outputs, but are set to either heating or cooling depending on
whether heating or cooling is required. In other words, when heating is active, they will follow the
settings for "Heating 1-3" and when cooling is active they will follow the settings for "Cooling 1-3".
17.26 Recirculation
Recirculation is a function for distributing the air in the room using the supply air fan. The extract air
fan can also be used, if desired. 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.
Either a digital output (Recirculation damper) or an analogue output (Y4 Extra sequence) can be used
as an output signal. When Y4 Extra sequence is used, the damper will become modulating.
Enable temp
control when
recirculation
No
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 can either have a unique setpoint or follow the supply air setpoint, with an
adjustable offset. 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.
End recirculation
control when room
temp exceeds:
25.0°C
If the room temperature rises above the set limit value, recirculation will be stopped.
Enable free cool
when recirculation
No
To lower the temperature, it is possible to configure free cooling to be used during recirculation, if
the conditions for free cooling are fulfilled.
Use extra time
group5 to start
recirculation: No
Recirculation is activated either via a digital input signal or by connecting it to "Timer output 5".
EAF running during
recirculation: No
The extract air fan can be selected to run during recirculation.
17.27 Pretreatment
Control of dampers and pump for preheated or pre-cooled outdoor air via an underground intake
channel. The digital output ”Pretreatment” is set to preheating when the unit is started and the outdoor
temperature is below the set heating start limit (default 8°C) or to precooling when the outdoor
temperature is above the set cooling start limit (default 19°C).
If the outdoor temperature exceeds the set heating start limit by more than 1°C (fixed), preheating
will be aborted, as well as if the outdoor temperature falls below the cooling start limit by 1°C.