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| Accessories
5. An internal supply air temperature sensor (SAT, default connection AI2 on the main circuit board) must be replaced
by a duct temperature sensor which can be acquired as an accessory. A duct temperature sensor must be installed in
the duct after heater/cooler. Connect the duct temperature sensor to analog input 2 (AI2) replacing the internal sup-
ply air temperature sensor.
Note:
A duct temperature sensor can be connected to analog inputs 6–7 on the connection board for better
access and then configured as a supply air temperature sensor. However the internal supply air
temperature sensor must be disabled in the control panel first.
6. A thermostat can be used to send signals (change-over feedback) regarding which actual medium (hot or cold) is
currently in a pipe. This signal can be also sent directly from the heat pump if such function is available. If heating is
demanded but only cold water/refrigerant is available - heating is deactivated).
Connect a change-over feedback wire (THS) to any free digital input and 24 V on the connection board.
Configuration
Before change-over heating/cooling can be activated, all components must be configured in the control panel.
1. Go to Service menu
2. Enter password (default 1111)
3. Go to Components menu, select Heater menu and select type as Change-over. Do advanced settings if
necessary.
Go to Components menu, select Cooler menu and select type as Change-over. Do advanced settings if
necessary.
4. Configure control signal of the heat pump or similar device. Go to Service menu. Select Output menu. In next
menu select ANALOG tab. Select the analog output to which the control signal wire is connected. Example if it is con-
nected to AO3 on the connection board, then select ANALOG OUTPUT 3 and select Y1 / Y3 Change-over from the
output type list.
5. Configure heating start signal. Go to Output. Select DIGITAL tab. Select the digital output to which the heating start
signal wire from the heat pump is connected. Example if it is connected to DO1 on the connection board, then select
DIGITAL OUTPUT 1 and select Step Controller Y1 Heating from the output type list.
6. Configure cooling start signal. Go to Output. Select DIGITAL tab. Select the digital output to which the cooling start
signal wire from the heat pump is connected. Example if it is connected to DO2 on the connection board, then select
DIGITAL OUTPUT 2 and select Step Controller Y3 Cooling from the output type list.
7. Configure frost protection sensor (FPT). Go back to Input menu. Select ANALOG tab. Select the analog input to which
the frost protection sensor is connected. Example if it is connected to AI6 on the connection board, then select ANA-
LOG INPUT 6 and select Frost Protection Temperature Sensor (FPT) from the input type list.
8. Configure temperature feedback signal from the pipe or heat pump. Go to Input menu. Select UNIVERSAL tab. Se-
lect the universal input to which the feedback wire is connected. Example if it is connected to UI1 on the connection
board, then select UNIVERSAL INPUT 1. Set signal type as Digital input and select an option Change-over
feedback from the input type list.
9. Since a duct temperature sensor replaces internal supply air temperature sensor, it doesn't need to be re-configured.
Note:
A duct temperature sensor can be connected to analog inputs 6–7 on the connection board for better
access and then configured as a supply air temperature sensor. However the internal supply air
temperature sensor must be disabled in the control panel first.
Fig. 24 Change-over heating/cooling connections
GB
212024 | A003, rev 29
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