ABB i-bus KNX Product Manual page 237

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ABB i-bus KNX
Planning and application
Correctly adjusting the hysteresis can also limit the number of relay operating cycles.
Example:
If the heating-operation setpoint is 21 °C and the hysteresis is 1.0 K, the controller will switch on when
the temperature falls below 20.5 °C and will switch off again when the temperature exceeds 21.5 °C.
The Hysteresis parameter should be set based on the following factors:
•
How quickly the heater can heat the room or how quickly the cooler can cool it
•
How people in the room perceive the temperature.
The selected hysteresis should not be too small, because a switching valve drive would constantly open
and close in this case.
The selected hysteresis should not be too large, because the temperature fluctuations in the room would
be too large in this case.
Note
VC/S 4.x.1 | 2CDC508220D0211 Rev. A 235