Order No. 2104 ..
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"Change-over between heating and cooling" parameter in the "Room temperature control -
> Controller general -> Setpoints" parameter branch set to "Via object".
In this case, the operating mode is controlled via the object "Heating/cooling switchover",
irrespective of the deadband. This type of change-over can, for example, become
necessary if both heating and cooling should be carried out through a one-pipe system
(heating and cooling system). For this, the temperature of the medium in the single-pipe
system must be changed via the system control. Afterwards the heating/cooling operating
mode is set via the object (often the single-pipe system uses cold water for cooling during
the summer, hot water for heating during the winter).
The "Heating/cooling change-over" object has the following polarities: "1": heating; "0"
cooling. After a reset, the object value will be "0", and the "Heating/cooling operating mode
change-over after reset" set in the ETS will be activated. You can use the "Heating/cooling
operating mode after reset" parameter to set which mode you want to activate after a reset.
For the "Heating" or "Cooling" settings, the controller will activate the configured
heating/cooling operating mode immediately after the initialisation phase. In case of
parameterisation "Operating mode before reset" the operating mode which was selected
before the reset will be activated.
If a switchover is made through the operating mode object, the operating mode will first be
changed into the one specified after a reset. A change-over to the other operating mode
will only take place after the device receives an object update, if necessary.
Notes on the setting "Operating mode before reset": frequent changing of the operating
mode (e. g. several times a day) during running operation can adversely affect the life of
the device as the read-only memory (EEPROM) used has been designed for less frequent
write access events only.
i
Temperature setpoints can be preset for each operating mode in the ETS as part of first
configuration. It is possible to configure the setpoints for the "Comfort", "Standby" and
"Night" modes directly (absolute setpoint presetting) or relatively (derivation from basic
setpoint). With absolute setpoint presetting there is no basic setpoint and also no deadband
in the mixed operating mode "Heating and cooling" (if necessary also with additional level).
Consequently, the room temperature controller cannot control the switchover of the
operating mode automatically, which is why, in this configuration, the setting for the
parameter "Switchover between heating and cooling" is fixed in the ETS to "Via object".
Page 66 of 171
Software "KNX CO2 sensor"
Functional description
