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Room temperature controller | Setpoint temperature limit, cooling
10.9
Setpoint temperature limit, cooling
In accordance with statutory requirements in Germany and elsewhere, the temperat-
ure at the workplace should be a maximum of 26 °C, or at least 6 K below outdoor
temperatures higher than 32 °C. Exceeding these limits is only permissible in excep-
tion circumstances. To meet these requirements, the room temperature controller of-
fers a setpoint temperature limit, which is only effective in cooling mode. If necessary,
the controller limits the setpoint temperature to specific values and prevents an ad-
justment beyond the limits.
The parameter "Limitation type" in the parameter node "Room temperature controller
-> RTC xx - General -> Setpoint temperature limit, cooling" can activate the limit and
specify 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 desired maximum temperature difference to the out-
door temperature can be specified in the range between 1 K and 15 K. The
specification is made using the parameter "Difference between setpoint tem-
perature and outdoor temperature of". The value can be set in step widths of
1 K.
If the outdoor temperature rises above the value of the parameter "Limit above
outdoor temperature of", then the controller activates the setpoint temperature
limit. It then permanently monitors the outdoor temperature and raises the set-
point 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 temperat-
ure 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 the value of the parameter "Limit
above outdoor temperature of".
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 between the setpoint temperature and the outdoor
temperature is set to 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 mode may only
be a maximum of 4 K below the outdoor temperature. The setpoint temperat-
ure limit applies to Night mode in the same way.
The automatic raising of the setpoint temperature by the setpoint temperature
limit goes only as far as the configured heat protection temperature. Therefore
the heat protection temperature can never be exceeded.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 199 of 257
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