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Room temperature controller | Setpoint temperature limit, cooling
A basic setpoint shift never affects an active setpoint temperature limit with dif-
ferential 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 switchover.
If the setpoint temperature limit is active, the difference between the basic
cooling and additional cooling levels is not taken into account. The command
values for both levels are identical. Only when the temperature falls below the
limit temperature is the difference between the levels considered again.
–
Setting "only maximum setpoint temperature"
In this setting, no setpoint temperatures that are greater than the maximum
setpoint temperature configured in the ETS are permitted in cooling mode for
the Comfort, Standby and Night modes. The maximum setpoint temperature is
specified in the parameter "Maximum setpoint temperature in cooling mode"
and can be configured within the limits 20 °C to 35 °C in steps of 1 °C.
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 in-
fluenced 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. Ex-
ample...
The maximum setpoint temperature is configured to 26 °C. The standby set-
point temperature is configured to 2 K higher than the comfort setpoint temper-
ature. The result of this is that, for command value limiting, the setpoint tem-
perature in Standby mode is limited to 28 °C. The setpoint temperature limit
applies to Night mode in the same way.
–
Setting "Maximum setpoint temperature and difference to outdoor temperat-
ure"
This setting is a combination of the two above-mentioned settings. In the
downward direction, the setpoint temperature is limited by the maximum out-
door temperature difference, whilst in the upward direction, the limit is made
by the maximum setpoint.
The maximum setpoint temperature has priority over the outdoor temperature
difference. This means that the controller keeps on raising the setpoint tem-
perature according to the difference to the outdoor temperature configured in
the ETS until the maximum setpoint temperature or the heat protection tem-
perature is exceeded. Then the setpoint is limited to the maximum value.
A setpoint limit enabled in the ETS can be activated or deactivated as necessary us-
ing a 1-bit object. For this, the parameter "Activation" can be set to "via object". In this
case, the controller only takes the setpoint limit into account if it has been enabled via
the object "Setpoint temperature limit - Activate / Deactivate" ("1" telegram). If the lim-
itation is not enabled ("0" telegram), the cooling setpoint temperatures are not limited.
After a device reset (bus voltage return, ETS programming operation), the object
value is "0", meaning that the setpoint limit is inactive.
The setpoint limit has no function in Heating mode.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 200 of 257
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