Combined Heating And Cooling Modes; Combined Heating And Cooling Modes - Switchover Of Heating/Cooling; Combined Heating And Cooling Modes - Operating Mode After Reset; Combined Heating And Cooling Modes - Heating/Cooling Control Value Output - Busch-Jaeger SD/U12.55.11-825 Manual

8.18.65 Combined heating and cooling modes

Notice
Only available when the "Control function" parameter is set either on "Heating
and cooling" or "Heating and cooling with additional stages".
8.18.66 Combined heating and cooling modes — Switchover of heating/cooling
Options:
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. The "Switchover heating/cooling" object is a transmitting 1-bit
communication object. In heating mode a 1 is sent and a 0 in cooling mode.
– 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 carried out via the corresponding 1-bit communication object. This
function is used 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 carried out manually on the device by the user of
the room or via the "Switchover heating/cooling" object via the bus. The 1-bit "Switchover
heating/cooling" communication object is a transmitting and receiving object. In heating
mode a 1 is sent and a 0 in cooling mode.
8.18.67 Combined heating and cooling modes — Operating mode after reset
Options:
After a bus voltage failure, a system reset or after switching on the bus voltage, the device
starts in the parameterised "Operating mode after reset". The operating mode can be changed
when the system is running using the options set under "Switchover heating/cooling".
8.18.68 Combined heating and cooling modes — Heating/cooling control value output
Options:
This parameter is used to define whether the control value is transmitted to the climate control
actuator using one or two objects. If the climate control actuator has separate control value
inputs for heating and cooling, or if separate actuators are used, then the option "Via 2 objects"
must be selected. Select the option "Via 1 object" if a single actuator only has one object that
receives both the heating and the cooling control values.
Product manual 2CKA001473B5472
Control elements and application parameter
Automatic
Only via object
On-site/via extension unit and via object
Cooling only
Heating
Via 1 object
Via 2 objects
Application "Internal RTC"
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