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Theben KNX Series User Manual

Theben KNX Series
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Appendix
RAMSES 718 P / RAMSES 718 S 97
6.8 Dead zone
The dead zone is a buffer area between heating and cooling mode.
Within this dead zone, neither heating nor cooling occurs.
Without this buffer area, the system would permanently switch between heating and cooling. As
soon as the set point was fallen below, the heating would be activated. After hardly reaching the
set point, the cooling would immediately start, the temperature would fall below the set point
and switch on the heating again.
Depending on the type of control, the dead zone can be extended by the value of the hysteresis.
Case 1: Heating and cooling with continuous control
Cooling set point 24ºC
DEAD ZONE 4 K
Heating set point 20 °C
The dead zone (4 K) is not affected.
Case 2: Heating with 2-point control and cooling with continuous control
Cooling set point 25 ºC
DEAD ZONE 4 K
Heating set point 20 °C
Heating hysteresis 1 K
The dead zone (4 K) is increased by the value of the hysteresis (1K) and offsets the cooling set
point value to 25 °C.
Case 3: Heating with 2-point control and cooling with continuous control
Cooling set point 25 ºC
Cooling hysteresis 1 K
DEAD ZONE 4 K
Heating set point 20 °C
The dead zone (4 K) is increased by the value of the hysteresis (1K) and offsets the cooling set
point value to 25 °C.

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Theben KNX Series Specifications

General IconGeneral
Communication ProtocolKNX
Ambient Temperature-5°C to +45°C
Storage Temperature-25°C to +70°C
Protection ClassIP20
Relative Humidity5% to 95%, non-condensing
Operating Voltage24 V DC (via KNX bus)