Art. No. SC 1000 KNX
The "Setpoint temperature limit in cooling mode" parameter in the "Room temperature control ->
Controller general -> Setpoint values" parameter node activates the limit and its function. The
following settings are possible...
-
Setting "Only difference to outdoor temperature"
In this setting, the outdoor temperature is monitored and compare to the active setpoint
temperature. The maximum temperature difference to the outdoor temperature can be
specified in the range between 1 K and 15 K. The specification is made using the
"Difference to outdoor temperature in cooling mode" parameter. The value can be set in
levels of 1 K.
If the outdoor temperature rises above 32 °C in the sense of the statutory requirements,
then the controller activates the setpoint temperature limit. It then permanently monitors the
outdoor temperature and raises the setpoint temperature so that is beneath the outdoor
temperature by the amount configured. Should the outdoor temperature continue rise, the
controller raises the setpoint temperature until the required difference to the outdoor
temperature is achieved. It is then not possible to undershoot the raised setpoint, e.g. by
changing the basic setpoint change.
The change to the setpoint temperature limit is temporary. It only applies for as long as the
outdoor temperature exceeds 32 °C.
With the setpoint temperature limit, the configured temperature difference relates to the
setpoint temperature of the Comfort mode for cooling. In other operating modes, the
temperature distance to Comfort mode must be taken into account. Example...
In the ETS, the difference to the outdoor temperature is set as 6 K. The Standby setpoint
temperature is configured to 2 K higher than the Comfort setpoint temperature. The result
of this is that, for command value limiting, the setpoint temperature in Standby operating
mode may only be a maximum of 4 K below the outdoor temperature. The setpoint
temperature limit applies to Night mode in the same way.
i
The automatic setpoint temperature raising by the setpoint temperature limit goes only as
far as the configured heat protection temperature. Therefore the heat protection
temperature can never be exceeded.
i
A basic setpoint shift never affects an active setpoint temperature limit with differential
measurement to the outdoor temperature. In this case, the setpoint temperature limit only
works with the unshifted basic setpoint. A setpoint shift active before the limitation is
restored after the limitation, if it was not reset in another way, e.g. by an operating mode
change-over.
-
Setting "Only max. setpoint temperature"
In this setting, no setpoint temperatures are permitted in Cooling mode related to the
Comfort, Standby and Night modes, which are greater than the maximum setpoints
configured in the ETS. The maximum setpoint temperature is specified in the "Max.
setpoint temperature in Cooling mode" parameter and be configured within the limits
20 °C to 35 °C in 1 °C levels.
With an active limit, no larger setpoint can be set in cooling operation, e.g. by a basic
setpoint change or a setpoint shift. However, heat protection is not influenced by the
setpoint temperature limit.
The maximum setpoint temperature configured in the ETS generally relates to the Comfort
setpoint temperature of Cooling mode. In other operating modes, the temperature distance
to Comfort mode must be taken into account. Example...
The maximum setpoint temperature is configured to 26 °C. The Standby setpoint
temperature is configured to 2 K higher than the Comfort setpoint temperature. The result
of this is that, for command value limiting, the setpoint temperature in Standby operating
mode is limited to 28 °C. The setpoint temperature limit applies to Night mode in the same
way.
Page 198 of 347
Software "Smart Control 501511"
Functional description
