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Room temperature controller | Room temperature controller - General
temperatures of the operating modes, the room temperature controller will automatic-
ally decide whether heating or cooling energy is required and calculates the com-
mand value for the heating or cooling system.
"Heating and cooling" mixed operating mode
In the "Heating and cooling" mixed operating mode, the controller is capable of trig-
gering heating and cooling systems. In this connection, you can set the change-over
behaviour of the operating modes...
–
Parameter "Heating/cooling switchover" in the parameter branch "Room tem-
perature controller -> RTCx - General" set to "automatic via RTC".
In this case, a heating or cooling mode is automatically activated, depending
on the determined room temperature and on the specified setpoint temperat-
ure. If the room temperature is within the preset deadband neither heating nor
cooling will take place (both command values = "0"). The communication ob-
ject "Setpoint temperature" displays the most recently active setpoint temper-
ature for heating or cooling. If the room temperature is higher than the cooling
setpoint temperature, cooling will take place. If the room temperature is higher
than the heating setpoint temperature, heating will take place.
When the operating mode is changed over automatically, the information can
be actively sent to the bus via the object "Operating mode - Status" to indicate
whether the controller is working in the heating mode ("1" telegram) or in the
cooling mode ("0" telegram). In this case, a telegram will be transmitted imme-
diately on changing from heating to cooling (object value = "0") or from cooling
to heating (object value = "1"), respectively.
The "Cyclical transmission" parameter enables cyclical transmission (factor
setting > "0 min") and specifies the cycle time.
With an automatic operating mode change-over, it should be noted that under
certain circumstances there will be continuous change-over between heating
and cooling if the deadband is too small. For this reason, you should, if pos-
sible, not set the deadband (temperature difference between the setpoint tem-
peratures for the comfort heating and cooling modes) below the default value
(2 K).
–
Parameter "Heating/cooling switchover" in the parameter branch "Room tem-
perature controller x -> RTCx - General" set to "via object".
In this case, the operating mode is controlled via the "Operating mode" object,
irrespective of the deadband. This type of change-over can, for example, be-
come 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. Af-
terwards 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 "Operating mode" object has the following polarities: "1": heating; "0":
cooling. After a reset, the object value will be "0", and the "Operating mode
after reset" set in the ETS will be activated. The parameter "Operating mode
after reset" can be used to determine which operating mode is activated after
a reset. For the "Heating" or "Cooling" settings, the controller will activate the
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 123 of 257
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