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Manual Corrigo E Ventilation, revision M
Chapter 5
Functional description
40
Digital humidity signal
A digital output signal, Dehumidification/Humidification, can be used for on/off control of
humidifier/dehumidifier. The output signal has an activation value and a deactivation value which
are connected to the humidity controller output. The signal is activated when the humidity controller
output rises above the set activation value and is deactivated when the humidity controller output
drops below the set deactivation value.
Inputs and outputs
AI
Room humidity sensor
AI
Duct humidity sensor
AO
Humidity control output 0…10 V DC
DO
Dehumidification/Humidification
5.4 Fan control
General
Fans can be single speed, 2 speed or variable speed via a frequency converter.
Single speed fans are controlled using the digital outputs Start SAF-Normal and Start EAF-Normal.
2-speed fans are controlled using the digital outputs Start SAF-Normal and Start EAF-Normal as
well as Start SAF-reduced and Start EAF-reduced giving normal and reduced speed respectively.
Variable speed control uses an analogue output per fan for controlling a frequency converter. There
are two setpoints for each fan, Normal and Reduced. Pressure or air flow control can be used.
Variable speed fans can also be configured to be run with fixed output values.
Outdoor compensation
When running pressure control, it is also possible to outdoor compensate the pressure.
Crosswise interlock
Via the display it is possible to configure crosswise interlocking between the supply air and extract
air fans.
Timer control, interlock at low outdoor temperature
The fans are normally controlled by the timer channels for normal and reduced speed. At very low
outdoor temperature 2-speed and pressure/flow controlled fans can be forced to low speed. The limit
temperature is settable and the function has a differential of 2K.
Normal, 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 to Normal speed, Reduced speed is first disengaged.
About 2 sec later, Normal speed is activated.
When Corrigo switches from Normal to Reduced speed, there is a settable retardation time from the
disengagement of Normal speed to the activation of Reduced speed. 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.
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