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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
Line no. Operating line
2210 Setpoint min
2211 Setpoint min OEM
2212 Setpoint max
2213 Setpoint max OEM
The upper setpoint level for the boiler is defined via the limit value of the electronic
temperature controller:
All setpoints and switch-on/switch-off thresholds are limited such that (cutout
temperature limit thermostat) –3 K is the resulting maximum switch-off threshold.
As a result, the requested setpoint is reduced to Maximum Switch-off threshold –
switch-off differential.
The switch-on threshold is reduced to Maximum Switch-off threshold – switch-off
differential – switch-on differential.
When the switching thresholds and the setpoint have been redefined, a check is made
to see whether the switch-on threshold satisfies at least the requirement of minimum
limitation.
If the switch-on threshold is lower, it is raised to the minimum limitation. Setpoint and
switch-off threshold are not readjusted here.
Due to unfavorable parameterization of Minimum boiler temperature, Maximum boiler
temperature safety limit thermostat and Switching differentials, a situation might now
occur where the switch-on threshold lies above the setpoint or above the switch-off
threshold.
For this reason, the last adaption step makes certain that the switch-on threshold lies at
least 2 K below the switch-off threshold. And the setpoint is not changed anymore.
Prelimitation
Postlimitation
2531
SdOff
SdOn
2210
TKOff
8311
TKOn
SdOff
TKOff
8311
TKOn
3 K
>2 K
7471d13e/1210
Figure 38: Boiler setpoints OEM
Key
Line no. Meaning
2210 Setpoint minimum
2531 Cutout temperature limit thermostat
8311 TKSoll Boiler temperature setpoint
TKAus Switch-off threshold boiler
TKEin Switch-on threshold boiler
SdAus Dynamic switch-off threshold (heating circuit/DHW)
SdEin Switch-on threshold (heating circuit/DHW)
Setpoint min/max –
min/max OEM
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