The change-over function is enabled and the configuration settings for change-over detection are shown in
Application tool when one of the following controller modes is selected:
✓
Heating/Cooling (change-over)
✓
H Heating/Cooling (change-over)
Figure 2-17 Change-over detection configuration settings in Application tool.
2.3.1
Change-over detection
Change-over detection is performed either by using a PT1000 sensor that is connected to an analog input, or
by using a potential-free contact that is connected to a digital input. The PT1000 sensor is mounted so that it
senses the pipe medium temperature.
When using a PT1000 sensor for change-over detection, the shift in controller change-over state is triggered
based on the difference between the pipe medium temperature and the room temperature. The controller
shifts the change-over state to
heating
when the pipe medium temperature is 3°C (default setting) higher
than the room temperature. The controller shifts the change-over state to
cooling
when the pipe medium
temperature is 4°C (default setting) lower than the room temperature.
When using a potential-free contact for change-over detection, the controller shifts the controller change-
over state to
cooling
when the contact is closed. The controller shifts the controller change-over state to
heating
when the contact is open. This assumes that the digital input is set to
Normally opened
, see the
Configuration -> Inputs / Outputs
pane in Application tool.
Change-over detection is configured on the controller inputs by using the values listed in
Table 2-11 Change-over detection configuration values and controller input types.
Controller input configuration value
Controller input type
Change-over temperature
Analog
Change-over
Digital
The configuration settings for change-over detection are described in
.
Table 2-12 Change-over detection configuration settings.
Configuration setting
Description
Change-over detection type
Digital switch
: Must be selected if a digital input is used for
change-over detection (default setting).
Analog temperature in incoming pipe
: Must be selected if an
analog input is used for change-over detection.
Temp. diff. that shifts change-over state to heating (°C)
The controller shifts the change-over state to
heating
when the
pipe medium temperature is this amount of degrees higher than
the room temperature.
Regio
Eedo
manual, Rev. D
21