Room air sensor
R4.1
Humidity
setpoint
exceeded
Humidity
actual value
within the
hysteresis
Exceeds room setpoint
+ hysteresis + 1 K
Cooling
ON
Heating
OFF *
Cooling
ON
Heating
OFF *
Cooling
ON
Heating
OFF
Exceeds room setpoint
+ hysteresis
Cooling
ON
Heating
OFF *
Cooling
ON / OFF
Heating
OFF *
Cooling
ON
Heating
OFF
Within the hysteresis Cooling
ON / OFF
Heating
ON
Cooling
ON / OFF
Heating
ON / OFF
Cooling
ON / OFF
Heating
OFF
Undercuts
room setpoint (**)
Cooling
OFF
Heating
ON
Cooling
OFF
Heating
ON / OFF
Humidity setpoint
undercut
Cooling
OFF
Heating
OFF
* The heating is switched off, although the measured relative humidity in the room is too high. In this case,
maintaining the room temperature has higher priority than adjusting the humidity.
(**) In this case, the room temperature cannot fall any lower, even if the heating fails due to a fault. Therefore,
no further case differentiation is required here to prevent the room air from becoming "too cold".
The switching threshold for humidity control can be set with the Feuchte Hyst parameter. In the event of this
value being undercut at the humidity sensor, the relay contact 33/34 for the heating circuit is switched on. The
heating contact is otherwise controlled as previously usual by the UR 141 NE / UR 141 TE. If you do not want
to use the switching on of the heating when the temperature falls below the setpoint temperature, the
"Heizkreis" parameter must be set accordingly. The heating circuit can only be used if the controller is used in
single-zone operation. This limits the usability of this solution to applications with one control circuit.
•
•
•
Special attention must be paid to the following:
Ifthedoorcontactisoperated,coolingandheatingcircuitareinitiallyswitchedoff(alsoirrespective
of the current humidity actual value).
The fan control switched ON the fan when the heating circuit is ON.
During a defrost, manual shutdown and a sensor fault at R4.1, the heating circuit is always OFF.
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