Manual Corrigo E Ventilation, revision M
Chapter 5
Functional description
39
A special analogue output signal, Y1 Heating/Y3 Cooling, is used for Change-over control.
Switching between heating and cooling can be done in two ways. A digital Change-over input
signal is normally used. Open contact will give heating control and closed contact cooling control. If
the input has not been configured, change-over is handled by the internal controller signal. The
output signal will follow the two regular output signals Y1 Heating and Y3 Cooling. When heating,
the digital outputs
Heating activate
and
Step controller heating step 1-4
are active. When cooling,
Cooling activate
and
Step controller cooling step 1-3
are active.
If frost protection sensor has been configured, it will function in the usual way when heating is
active. However, when cooling is active, it will only be used for indicating temperature.
Three digital output signals, Heating/Cooling step 1, Heating/Cooling step 2 and Heating/Cooling
step 3, are also connected with change-over. The signals can be used for reversing a step controlled
heating pump etc. See also section 5.1.4 Step controller Heating/ DX cooling.
5.2 Extra control circuit
An independent temperature control circuit for control of for example after-heaters. The circuit can
be configured to heating or cooling. It has an analogue input signal for temperature sensors and an
analogue output signal 0…10V. There is also a digital output signal which is activated when the
analogue output signal is above 1 V and deactivated when the analogue signal is below 0.1 V. The
circuit can be configured to be active all the time or to be active only when the main unit is running
at normal speed.
5.3 Humidity control
General
Humidity control can be configured as Humidification, Dehumidification or both Humidification
and Dehumidification.
Two humidity sensors can be connected, a room sensor for control and an optional duct sensor for
maximum limiting. The limit sensor can be omitted.
The humidity control is handled by a PI-controller.
The humidity sensors must give 0…10V for 0…100% RH.
Humidification
An analogue output is used to control a humidifier. The output will increase on decreasing humidity.
A digital output can also be used to start a humidifier.
Dehumidification
An analogue output is used to control a dehumidifier. The output will increase on increasing
humidity. A digital output can also be used to start a dehumidifier.
Humidification/dehumidification
An analogue output is used to control a humidifier. The output will increase on decreasing humidity.
The cooling output Y3 will be activated for dehumidification through condensation. The output will
increase on increasing humidity. This signal overrides the cooling signal from the temperature
controller so the output can be activated for dehumidification even if the temperature controller
demand is zero.
For good temperature control when using cooling for dehumidification it is important that the cooler
is placed first in the air stream so that the exchanger and heater can be used to reheat the air after
dehumidification.
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