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VARIA 826 S KNX Multi-functional display with room thermostat
6.9.2 Positive hysteresis
Heating lasts until the temperature reaches "setpoint value + hysteresis " threshold has been
achieved.
The heating is only switched on again when the temperature falls below the setpoint value.
Heating example:
Heating with setpoint value 20°C, hysteresis = 1°C and ambient temperature 19 °C.
The heating is switched on and only switches off again when a temperature of 21 ºC
(= 20 °C + 1 °C) is achieved.
It switches on again when the temperature falls below 20 °C.
6.10 Dead zone
The dead zone is a buffer area between the heating and cooling operation.
Neither heating nor cooling takes place within this dead zone.
Without this buffer zone, the system would switch continuously between heating and cooling.
As soon as the setpoint value has been under-run, the heating is activated and the setpoint
value would not be achieved. If cooling were then to be started immediately, the temperature
would fall below the setpoint value and switch on the heating again.
Depending on the type of control the dead zone can be extended by the value of the
Hysteresis.
6.10.1 Case 1: Heating and cooling with continuous control
Cooling set point value
24ºC
DEAD ZONE 4 K
Heating setpoint value
20 °C
The dead zone (4 K) is not affected.
Updated: Sep-14 (Subject to change) Page 153 of 182
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