ABB i-bus KNX Yucus YUB/U1.0.1 Series Technical Reference Manual page 127

KNX Technical Reference Manual
ABB i-Bus ® KNX Yucus
When room temperature controller is off, it will operate at the min basic load.
12.34.69 Combine heating and cooling mode – Switchover heating / cooling
Options
Note: Only available when the "Device function" parameter is set on either
"Single device" or "Master device" and the control function parameter is set on either
"Heating and cooling" or "Heating and cooling with additional stages".
This function makes it possible to switch between the heating and cooling mode of the
device.
– Automatic: E.g. for four-conductor systems which allow the switchover between heating
and cooling at all times. The device switches automatically between heating and cooling
and to the associated setpoint. "Switchover heating/cooling" is a transmitting object.
– Only via object: E.g. for two-conductor systems which are operated in heating mode in
the winter and cooling mode in the summer. The switchover between heating and cooling
and to the associated setpoint is carry out via the corresponding communication object.
This function is use when a central switchover of the single room controllers is required.
"Switchover heating/cooling" is a receiving object.
– Local/ via extension unit and via object: E.g. for four-conductor systems which allow the
switchover between heating and cooling at all times. The switchover between heating and
cooling and to the associated setpoint is carry out manually on the device by the user of
the room or via the "Switchover heating/cooling" object via the bus. "Switchover
heating/cooling" is a transmitting and receiving object.
12.34.70 Combine heating and cooling mode – Operating state after reset
Options
Note: Only available when the "Device function" parameter is set on either
"Single device" or "Master device" and the control function parameter is set on either
"Heating and cooling" or "Heating and cooling with additional stages".
After a bus voltage failure, a system reset, or the attachment of a device to the bus coupler,
the device starts in the parameterized "Operating state after reset". The operating state
can be change when the system is running using the options set under "Switchover
heating/cooling".
Automatic
Only via object
Local/via extension unit and via object
Cooling
Heating
126