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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
6.11.7 Boiler/burner control
Line no. Operating line
2241 Burner running time min
Here, set a period of time after burner startup during which the off time differential is
increased by 50%. This means that with similar heating up processes, the 2-position
controller switches off later. But this parameter setting does not guarantee continuous
burner operation for the parameterized period of time.
This option is used only when none of the 3 criteria for the dynamic switching
differentials is parameterized:
Dyn SD on setpoint (2464), Dyn SD with HC/DHW change (2466), and Dyn SD when
burner on (2467) are switched off.
Switching diff off max HCs (2456) and Switching diff off max DHW (2462) for the
maximum switch off differentials are thus deactivated.
The switch-off threshold is calculated based on the switching thresholds of the
respective Heating/DHW mode:
Switch-off threshold = setpoint + (min. switch-off differential) * 1.5.
Generally speaking, the use of dynamic switch-off thresholds seems more
advantageous. For this reason, the minimum burner running time should be seen in the
context of backward compatibility.
Line no. Operating line
2243 Burner off time min
The minimum burner off time acts exclusively between successive startup cycles
resulting from space heating requests. It locks the boiler for an adjustable time. This
period of time is started after regular shutdowns or when the limit thermostat cuts out in
Heating mode. The 2-position controller initiates new startups resulting from space
heating requests only when this period of time has elapsed.
Burner running time min
Burner off time min
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