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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
Line no. Operating line
2467 Dyn SD when burner on
Off
On
The third option is to activate the dynamic switching thresholds each time the burner is
started up. This function is activated/deactivated via parameter Dyn SD when burner on
(2467)
Off
Function is deactivated.
On
Function is activated.
If the application with dynamic switching thresholds is not required (all Dyn SD
parameters set to Off), the maximum switch-off thresholds remain deactivated. In that
case, the switch-on thresholds and minimum switch-off thresholds are used for the 2-
position controller.
6.11.19 Delay heat request special operation
Line no. Operating line
2470 Delay heat req special op
Certain types of heating systems use heating circuit valves in place of heating circuit
pumps as actuating elements. Such valves are sometimes characterized by relatively
long changeover times. As a result, with special operating modes (chimney sweep,
controller stop, manual control), the heat source/burner might reach its operating
position before the heating circuit valve/mixing valve has opened, meaning that the
produced heat cannot be drawn by the heating circuit.
Parameter Delay heat req special op (2470) can be used to delay burner startup, thus
allowing the actuating element to release the heating circuit before the heat source
reaches its operating position.
Note!
Since in this case both system pump and heating circuit valve are controlled via the
forced signal, the heating circuit valve cannot be switched on before the system
pump. So the system pump works against the fully closed heating circuit valve until it
opens.
Dyn SD when burner on
Dyn SD deactivated
Delay heat req special
op
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