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VARIA 826 S KNX Multi-functional display with room thermostat
6.13 Base setpoint value and current setpoint value
The base setpoint value is the standard temperature for the comfort mode and the reference
temperature for reduction in standby and night modes.
The programmed basic setpoint value (see “Base setpoint value after loading the application”)
is stored in Object 0 and can be changed at all times via the bus by sending a new value to
Object 0.
After reset (bus returned), the last used base setpoint value is restored.
The current setpoint value is the value that actually determines the control. It is the result of
all the operating mode reductions or increases depending on the control function.
Example:
At a base setpoint value of 22°C and a reduction in night mode of 4K, the current setpoint
value (in night mode) is: 22ºC - 4K = 18ºC. During the day (in comfort mode) the current
setpoint value is 22°C (in heating mode).
The formation of the current setpoint value due to the basic setpoint value can be observed in
the block diagram on the next page:
The base setpoint value on the left is specified via object 0 or set on the device.
The current setpoint value is on the right, i.e. the value upon which the room temperature is
effectively controlled.
As you can see in the block diagram, the current setpoint value depends on the operating
mode (5) and the control function (4) selected.
The base setpoint value limits (2) prevent an incorrect base setpoint value from being
specified to
Object 0. These are the following parameters:
minimum valid base setpoint value
maximum valid base setpoint value
Should the setpoint value lie outside the parameter values for frost and heat protection due to
a setpoint value offset, it shall be limited to these values by the safety limits (11).
Updated: Sep-14 (Subject to change) Page 163 of 182
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