CORRIGO VENTILATION 3.6 MANU

38 Chapter 5 Functional description Manual Corrigo Ventilation, revision V
Override of reduced speed for DX cooling
Override to normal quantity of air for DX cooling when the unit runs on reduced quantity of air. The
fans can be set to normal operation when cooling is required at high outdoor temperatures (e.g. >14°C,
the same temperature limit as for blocking of DX cooling).
5.1.5 Support control
Support control is normally used when room temperature control or extract air control has been
configured. When extract air control is configured a room sensor must be installed. “Support control
Heating” or “Support control Cooling” will run if Support control is configured, the running mode is
in Off-state (timer control OFF and not in extended running) and if conditions call for support control
(see below). Minimum run time is settable 0 to 720 minutes (FS= 20 minutes).
Support control can also be configured when supply air temperature control is used, if a room sensor
is installed. The controller uses the configured min. (FS=15°C) and max. (FS=30°C) limitation values
as support control setpoints. However, in this case the min. and max. limitation values cannot be
changed. To change the values, temporarily configure room control, change the min. and max. values
and then change back to supply air control.
Support control can also be configured to start only with the supply air fan. In this mode, the extract
air fan is not active. This requires a digital output to be configured, which controls the recirculation
damper to open completely so the supply air fan can circulate the air to and from the room. The digital
output is called ”recirculation damper”.
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.