Siemens LMS14 User Manual page 232

Key
232/617
Building Technologies Division
The following graph shows the various phases of flue gas supervision:
Flue gas temperatuer B8
2474
2473
2478
= Pmin...Pmax = Pmin...PBegr
Boiler output
T1
T0
Figure 44: Flue gas supervision
Line no. Meaning
2454 Switching diff on HCs
2473 Flue gas temp output red
2474 Flue gas temp swi-off limit
2476 Flue gas superv shutdown
2477 Flue gas superv st prev tme
2478 Flue gas temp output limit
2479 Fl'g superv time con rel mod
8316 Flue gas temp
9541 Postpurge time TL max
Pmax
PBegr
Pmin
Limitation of output is triggered when:
Flue gas temperature  flue gas temperature output limitation.
Output reduction (limiting the burner's output to low-fire) is triggered in the following
case:
Flue gas temperature  Flue gas temperature output reduction
Boiler shutdown is triggered when:
Flue gas temperature  flue gas temperature switch-off limit.
Output reduction or shutdown is canceled when:
Flue gas temperature < Flue gas temp output red (2473) – Switching diff on HCs (2454)
User Manual LMS14...
6 The settings in detail
Pmin... = Pmin
= Pmin...Pmax
PBegr
T2 T3 T4 T5
Switch-on differential heating circuits
Flue gas temperature output reduction
Flue gas temperature switch-off limit
Flue gas supervision switch-off limit
Flue gas supervision start prevention time
Flue gas temperature output limitation
Filter time constant for falling flue gas temp.
Flue gas temperature
Postpurge time TL max
Maximum boiler output
Limited boiler output
Minimum boiler output
T
B8
2477
= 0 = 0
= Pmin...Pmax
t
T6 T7
CC1U7471en
07.05.2014