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VARIA 826 S KNX Multi-functional display with room thermostat
6.8 Continuous and switching control
A switching (2 point) control recognises only 2 statuses, On or Off.
A continuous control works with a control variable between 0% and 100% and can thus
exactly measure out the energy input. This achieves a pleasant and precise degree of control.
Table 93: Summary of control functions
Operating mode / stage
Type of control
Hysteresis
Heating
2-point / PI controller
positive
Cooling
2-point / PI controller
negative
Additional stage
2-point / P control
negative
6.9 Hysteresis
Hysteresis determines the difference between a controller’s switching on and off temperature.
It can be both positive and negative.
A combination of heating and cooling control influences the amount of the Dead zone.
Without hysteresis, the control would activate and deactivate continuously provided the
temperature is within the setpoint value range.
6.9.1 Negative hysteresis:
Heating: is provided until the setpoint value has been reached.
Afterwards, the heating is only switched on again when the temperature falls below the
"Hysteresis setpoint value" threshold.
Cooling: lasts until the "Hysteresis setpoint value" threshold has been achieved.
Afterwards, it is only switched on again when the temperature rises above the setpoint value.
Example of additional heating stage
Additional stage with a setpoint value of 20 °C, hysteresis 0.5 K and starting temperature 19
°C.
The additional stage is switched on and does not switch off again until the setpoint value (20
º) is reached.
The temperature falls and the additional stage does not switch on again until 20ºC-0.5K= 19.5
ºC.
Cooling example:
Cooling with setpoint value 25 °C, hysteresis = 1°C and ambient temperature 27 °C.
The cooling is switched and only switched off again when a temperature
of 24 ºC (25 °C – 1 °C) is achieved.
It switches on again when the temperature rises above 25 °C.
Updated: Sep-14 (Subject to change) Page 152 of 182
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