CORRIGO VENTILATION 3.6 MANU

34 Chapter 5 Functional description Manual Corrigo Ventilation, revision V
Deicing
Deicing is activated either when the digital signal ”Deicing” is activated or when the value of the
analogue input ”Deicing temp” falls below the de-icing limit (-3°C), or when the analogue signal
”Deicing pressure guard” rises above the set value for the current pressure. It is deactivated when the
digital signal is reset, or alternatively when the analogue signal exceeds/falls below the limit value
plus a settable differential.
On deicing:
A PI-controller compares the deicing setpoint with the signal ”De-icing exchanger”. The lesser of the
output signal from this controller and the output from the ordinary controller is used as output to the
dampers.
Function to prevent the heat exchanger from freezing:
A temperature sensor, exhaust air, outdoor air or extra controller sensor can be used as a prevention
sensor. It is possible to set a starting temperature. This represents both the minimum time that the
function should be active, the supply air fan (SAF) and extract air fan (EAF) compensation, as well
as the minimum time before the next prevention cycle should begin. While the cycle is active, ”De-
icing” is shown in the display and in E tool
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Rotating exchanger
Control
Rotational speed is controlled by the analogue signal ”Y2 exchanger. A rotation sentinel can be
connected to the digital input ”Rotation sentinel exchanger”. An alarm is generated if this input is
activated at the same time as the analogue output signal is higher than 1.0 V.
Function to prevent the heat exchanger from freezing:
A temperature sensor, exhaust air, outdoor air or extra controller sensor can be used as a prevention
sensor. It is possible to set a starting temperature. This represents both the minimum time that the
function should be active, the supply air fan (SAF) and extract air fan (EAF) compensation, as well
as the minimum time before the next prevention cycle should begin. While the cycle is active, ”De-
icing” is shown in the display and in E tool
©
.
Liquid connected exchanger
Control
A mixing valve in the exchanger circulation system is controlled by the analogue signal ”Y2 heat
exchanger” or by two digital outputs “Exchanger 3-pos. actuator, increase” and “Exchanger, 3-pos.
actuator, decrease”.
The circulation pump (digital output "Start/stop P1, liquid exchanger") is started as soon as the
actuator control signal exceeds 0.1 V and is stopped when the valve has been closed for more than 5
minutes.
Deicing
Deicing is activated either when the digital input signal ”Deicing exchanger” is activated or when the
value of the analogue input ”Deicingtemp” falls below the deicing limit (-3°C). It is deactivated when
the digital input is reset or the analogue input rises above the limit value plus a settable differential.
On deicing:
A PI-controller compares the deicing setpoint with the signal ”De-icing Exchanger”. The lesser of the
output signal from this controller and the output from the ordinary controller is used as output to the
actuator.