CORRIGO VENTILATION 3.6 MANU

40 Chapter 5 Functional description Manual Corrigo Ventilation, revision V
5.1.8 Enthalpy control
Calculating the enthalpy means to calculate the energy content of the air, taking into consideration
both the temperature and the air humidity. The value is given in energy per kilogram air (kJ/kg). If
enthalpy control is configured, the enthalpy is calculated both indoors and outdoors. If enthalpy
control is configured, enthalpy is calculated both outdoors and for the extract air. If the enthalpy is
higher outdoors than in the extract air, the recirculation damper function will be overridden to increase
the recirculation. The function is not active when using free cooling, in which case outdoor air is used
for cooling the room instead. In order for the enthalpy calculation to be made the functions enthalpy
control and cooling recovery must be active, and four sensors are required:
In- and outputs
AI
Outdoor temperature sensor
AI
Outdoor humidity sensor
AI
Room/Extract air temperature sensor
AI
Room humidity sensor
5.1.9 Heat exchanger efficiency monitoring
General
The function calculates the heat exchanger temperature efficiency in percent when the output signal
to the exchanger is higher than 5 % and the outdoor temperature is lower than 10°C.
When the control signal is lower than 5 % or the outdoor temperature is higher than 10°C the display
will show 0 %.
The heat exchanger efficiency is calculated using the following formula:
Option 1: Efficiency = (Extract air temp – Exhaust air temp) /
(Extract air temp – Outdoor temp) * 100
Option 2: Efficiency = (Efficiency temp – Outdoor temp) / (Extract
air temp – Outdoor temp) * 100
Alarm
An alarm is activated if the efficiency falls below the set alarm level (50 %).
In- and outputs
AI
Outdoor temperature sensor
AI
Extract air sensor
AI
Exhaust air sensor
AI
Efficiency temperature sensor
The efficiency temperature sensor should be placed after the heat exchanger but before the heater. It
will then replace the exhaust air temperature sensor.
5.1.10 External setpoint
An external setpoint device, e.g. TBI-PT1000 or TG-R4/PT1000 can be connected. The setpoint
device must follow the PT1000 resistance curve. The unit is connected to the analogue input signal
”Extra temperature sensor 1”. The function must be activated in the menu ”Configuration/External
setpoint”. The setting range can be min/max limited via a setting in the controller. The factory setting
is min: +12, max: +30.
In- and outputs
AI
Extra temperature sensor 1