Siemens LFL1.622 - Burner Control Functions

12/25
Building Technologies Division CC1N7451en
20.11.2017
Function
2-stage direct spark flame burner
min.
0...
100%
R
M1
M2
Z
BV1
LR
BV2
FS
A
B
C
D
7451a06/0600
T
P
M
R
M
LK
~
t7 t1
t6
t3
TSA
t4
t5
t11
t12
t13
Modulating direct spark flame burner
R
LR
t5t11
t12
t13
FS
min.
LK
0...
M
100%
RV
A
BV1
M2
Z
~
M
P
R
M1
T
t4
t3
t7
t1
TSA
B
t6
C
D
7451a07/0600
2-stage interrupted pilot burner
FS
BV2
min.
LK
0...
M
R
100%
LR
ZBV
M1
M2
Z
~
M
P
R
T
t12
t4´
t5
A
B
CD
t11
t13
t6
t7
t1
t3´
TSA´
7451a08/0202
t9
BV1
Legend
BV... Fuel valve
FS Flame signal amplifier
LK Air damper
LR Load controller
M... Fan or burner motor
R Control thermostat or pressurestat
RV Modulating fuel valve
Z Ignition transformer
ZBV Pilot gas valve
A Start command by «R»
B Operating position of burner
B-C Burner operation
C Controlled shutdown
C-D Sequence switch travels to start position
«A», postpurging
D-A End of control sequence
t1 Prepurge time with air damper fully open
t3/t3´ Preignition time
t4/t4´ Interval «BV1-BV2» or «BV1-LR»
t5 Interval between voltage at terminal
19 and terminal 20
t6 Postpurge time
t7 Interval between start command and
voltage at terminal 7
t9 2nd safety time with burners equipped
with a pilot burner
t11 Air damper’s running time to the fully
OPEN position
t12 Air damper’s running time to the low-fire
position
t13 Permissible afterburn time
TSA/
TSA´ Ignition safety time