Siemens LMS14

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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Line no. Operating line
[3911.1] Dur bli’cir Tgradien
Duration of don’t care transition for checking the temperature gradient of the boiler flow.
Line no. Operating line
[3912.1] Dur bli’cir Tr>Tf
Duration of don’t care transition for making the comparison return above flow.
Line no. Operating line
[4091.1] MaxRate Trise flow
Maximum rate of boiler flow temperature increase.
Line no. Operating line
[3913.1] Numbr err, Tgrad 24h
Counter limit for triggering lockout in the event of an error in connection with the
gradient.
Line no. Operating line
[3914.1] Numbr err, SLT 24h
Counter limit for triggering lockout in the event of an error in connection with residual
heat.
Line no. Operating line
[3916.1] MaxTdiff flow/return
Maximum delta between boiler flow and boiler return temperature at which temperature
limitation does not yet intervene.
If the difference is greater, the boiler output is reduced by 20%.
Line no. Operating line
[6604.1]
SLT T diff low-fire
If there is a rise in the temperature difference between the boiler flow and boiler return
MaxTdiff flow/return [3916.1] + SLT T diff low-fire [6604.1], the boiler output is restricted
to partial-load output.
Line no. Operating line
[6605.1]
SLT T diff start prev
MaxTdiff flow/return [3916.1] + SLT T diff start prev [6605.1]: In this case, the burner is
switched off and a start prevention is triggered until the temperature difference between
the flow and return is lower than MaxTdiff flow/return [3916.1].
Line no. Operating line
[3921.1] Numbre err, Tdiff 24h
Counter limit for triggering lockout in the event of a delta T error.
Dur bli’cir Tgradien
Dur bli’cir Tr>Tf
MaxRate Trise flow
Numbr err, Tgrad 24h
Numbr err, SLT 24h
MaxTdiff flow/return
SLT T diff low-fire
SLT T diff start prev
Numbre err, Tdiff 24h