CORRIGO VENTILATION 3.6 MANU

44 Chapter 5 Functional description Manual Corrigo Ventilation, revision V
This compensation can be made depending on supply air, extract air, room or outdoor temperature.
It is possible to compensate either one or both of the fans at the same time. It is possible to set which
fan should then be compensated, the supply or extract air fan.
Crosswise interlock
Crosswise interlock of fans can be configured, which e.g. means that if one fan stops, the other fan
will also stop.
Timer outputs, interlock at low outdoor temperatures
The fans are normally controlled by the timer channels for normal and reduced speed. At very low
outdoor temperatures, "2-speed fans" or "pressure controlled fans" can be forced to "reduced speed".
The limit temperature is settable and the function has a differential of 2K.
Normal and reduced speed
Units with 2-speed or pressure control fans are always started at "reduced speed". After a settable
time, Corrigo switches to "Normal speed" if normal speed is valid at start-up. When 2-speed fans are
switched from "Reduced speed" to "Normal speed", "Reduced speed" is first disengaged. About 2 sec
later, "Normal speed" is activated.
When Corrigo switches from "Normal speed" to "Reduced speed", there is a settable retardation time
from disengagement to activation. See the section Retardation time.
The extract air fan and the supply air fan have individual start and stop delays which are normally set
so that the extract air fan is started before the supply air fan. If there are not enough digital outputs
for individual control, both fans will have to be started using the signal for the supply air fan, and the
delay be created using an external time relay.
5.4.1 Pressure control
Frequency control pressure
During pressure control, two separate analogue output signals are used for supply and extract air and
two separate analogue input signals for supply and extract air for pressure transmitters. The fan speeds
are controlled via frequency converters, thereby maintaining constant pressure. The pressure
transmitter inputs are scalable using “Min volt input (Vmin)” and “Max volt input (Vmax)”.
A digital activation signal is normally used for each fan (“SAF freq conv start” and “EAF freq conv
start”), for sending a start signal to the frequency converters. The start signal is activated as long as
the fan is expected to be running.
For the supply and extract air fans, there are two individually settable setpoint values, one
corresponding to normal speed and one corresponding to reduced speed. Changing between the two
setpoint values is done using the timer channels for normal and reduced speed or using digital input
signals ("Extended Operation, normal" and "Extended Operation, reduced").
Outdoor compensation
When running pressure control, it is also possible to outdoor compensate the pressure setpoint value.
The outdoor compensation is linear and is set using two parameter pairs which give the value of the
compensation at two different outdoor temperatures. The compensation can be positive or negative.
The outdoor compensation is set in the menu Actual/Setpoint.
Using E tool
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, you can also choose to only outdoor compensate the pressure value of the supply air
fan. In that case, the extract air fan is controlled with constant flow, independent of the outdoor
temperature.
The compensation can be selected to apply to both normal and reduced speed, or for normal speed
only (factory setting = both speeds).