Corrigo ventilation 3.4 manu

34 Chapter 5 Functional description Manual Corrigo Ventilation, revision R
Deicing
De-icing is activated either when the digital input signal ”De-icing exchanger” is activated or when
the value of the analogue input ”Deicing temp” 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.If a differential pressure switch is used in addition to the heat exchanger, the digital
input ”Deicing thermostat exchanger” is also used.
On de-icing:
A PI-controller compares the de-icing setpoint with the signal ”Deicing exchanger”. The lesser of
the output signal from this controller and the output from the ordinary controller is used as output to
the dampers.
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 1.0V.
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 circulation pump, 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.
De-icing
De-icing is activated either when the digital input signal ”De-icing exchanger” is activated or when
the value of the analogue input ”Deicingtemp” falls below the de-icing 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 de-icing:
A PI-controller compares the de-icing 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.
Outdoor temp control of exchanger
Instead of using Y2 for analogue control of the heat exchanger it can be set to run on-off against
outdoor temperature. The function controls a digital output “Exch control”, which is activated when
the outdoor temperature falls below a set value.
Mixing dampers
Control
The analogue output signal ”Exchanger Y2”, or the two digital output signals "Exchanger 3-
position, increase" and "Exchanger 3-position, decrease", control two dampers for gradual mixing of
outdoor air and recirculated air. In this mode the output signal decreases with increasing heat
demand.