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Room temperature controller | Setpoint temperature limit, cooling
Status message of the setpoint temperature limit
If a setpoint temperature limit is active, this is signalled to the bus via the object "Set-
point temperature limit - Status". This makes it possible for the user to recognise a
changed temperature setpoint. After a reset, the status message object value is "0".
This corresponds to the normal setpoint of the operating modes "Comfort", "Standby"
and "Night". The setpoint temperature status is only sent when there is a change.
10.9.1 Setpoint temperature limit parameters
Limitation type
The variable on which the setpoint temperature limit depends can be defined here.
"Only difference to outdoor temperature": In this setting, the outdoor temperature is
monitored and compared with the active setpoint temperature. The specification of
the maximum temperature difference to the outdoor temperature is made using the
"Difference to outdoor temperature in cooling mode" parameter. If the outdoor tem-
perature rises above 32 °C, 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 rising, the controller raises the setpoint
temperature until the required difference to the outdoor temperature is reached, or,
at most, the heat protection temperature. It is then not possible to undershoot the
raised setpoint, e.g. by changing the basic setpoint change. The change to the set-
point temperature limit is temporary. It only applies for as long as the outdoor tem-
perature exceeds 32 °C.
"Only maximum setpoint temperature": In this setting, no setpoint temperatures that
are greater than the maximum setpoint configured in the ETS are permitted in cool-
ing mode for the Comfort, Standby and Night modes. The maximum temperature
setpoint is specified by the "Max. setpoint temperature in cooling operation" para-
meter. 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 influ-
enced by the setpoint temperature limit.
"Maximum setpoint temperature and difference to outdoor temperature": This setting
is a combination of the two above-mentioned settings. In the downward direction, the
setpoint temperature is limited by the maximum outdoor temperature difference,
whilst in the upward direction, the limit is made by the maximum setpoint. The max-
imum setpoint temperature has priority over the outdoor temperature difference. This
means that the controller keeps on raising the setpoint temperature according to the
difference to the outdoor temperature configured in the ETS until the maximum set-
point temperature or the heat protection temperature is exceeded. Then the setpoint
is limited to the maximum value.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Only difference to outdoor temperature
Only maximum setpoint temperature
Maximum setpoint temperature and differ-
ence to outdoor temperature
Page 201 of 257
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