Corrigo ventilation 3.4 manu

38 Chapter 5 Functional description Manual Corrigo Ventilation, revision R
Support control heating
Demand for support control heating is when the room temperature is lower than the start value
which is settable 0 to 30°C. The fans will run at the preset speed, the heater and the heat exchanger
are controlled by the supply air temperature controller with the configured max limitation for the
supply air (FS=30°C) as setpoint and the cooling is shut off (0%). Support control heating stops
when the room temperature rises to the stop value and the minimum run time has been exceeded or
the running mode changes to ”On”.
Support control cooling
Demand for support control cooling is when the room temperature is higher than the start value
which is settable 20 to 50°C. The fans will run at the preset speed, the heater and the heat exchanger
are shut down (0 %) and the cooling is controlled by the supply air temperature controller with the
configured minimum limitation (FS=15°C) as setpoint. Support control cooling stops when the
temperature falls below the stop value and the minimum run time has been exceeded or the running
mode changes to ”On”.
5.1.6 Free cooling
This function is used during the summer to cool the building night-time using cool outdoor air,
thereby reducing the need for cooling during the day and saving energy.
Free cooling requires an outdoor sensor (or an inlet temperature sensor) and either a room sensor or
an extract air sensor. The outdoor sensor can be placed in the fresh air inlet duct.
Free cooling is only activated when all the start conditions are fulfilled.
Start conditions:
 Less than four days have passed since the unit was last in running mode.
 The outdoor temperature during the previous running period exceeded a set limit (22°C).
 It is between 00:00 and 07:00:00 in the day (settable).
 The timer outputs for "normal speed", "Extended running, Normal" and "External switch"
are Off.
 A timer channel will be On sometime during the recently started 24 hours.
If the outdoor sensor is located in the fresh air inlet duct and/or an extract air sensor is selected and
ALL the start conditions are fulfilled, free cooling is activated and will run for 3 minutes to ensure
that the temperature measurement when using an extract air sensor reflects the corresponding room
temperature and that the outdoor temperature sensor senses the outdoor temperature even if it is
placed in the fresh air inlet duct. If the outdoor sensor is not located in the fresh air inlet duct and a
room sensor is selected, the unit will not start free cooling as long as all the temperatures are not
within the start and stop temperature intervals.
After three minutes, the stop conditions will be controlled.
Stop conditions:
 Outdoor temp above the set max. value (18°C) or below the set min. value (condensation
risk, 10°C).
 The room temp/extract air temp. is below the set stop value (18°C).
 The timer outputs for "normal speed", "Extended running, Normal" or "External switch"
are On.
 It is past 07:00:00 in the day.
If any stop condition is fulfilled after three minutes, the unit will stop again. Otherwise, operation
will continue until a stop condition is fulfilled.
When free cooling is active, the fans run at normal speed or the set value for pressure/flow control.
It is also possible to set a delay on the fan setpoint when cooling. The digital output "Free cooling
operation" is active. The outputs "Y1 heating", "Y2 heat exchanger" and "Y3 cooling" are shut
down. After free cooling has been active, the heating output is blocked for 60 minutes (configurable
time).