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RAM 713 Fan Coil room thermostat
theben
Version: Sep-11 (subject to change) Page 61 of 65
7 Glossary
7.1 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.
7.2 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 switch on and off continuously provided the
temperature is within the setpoint value range.
7.2.1 Negative hysteresis:
Heating: 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: 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.
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 24C (25 °C – 1 °C) is achieved.
It switches on again when the temperature rises above 25 °C.
61


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