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Function
2-stage expanding flame burner
A
T
R
P
t7
t1
M1
M
~
M2
Z
t3´
BV1
R
LR
t16
100%
M
min.
LK
0...
BV2
t11
FS
Modulating expanding flame burner
A
T
R
P
t7
t1
M1
M
~
M2
Z
BV1
R
LR
t11
100%
M
min.
LK
0...
RV
FS
7153a10/0498
General
Building Technologies Division
B
t3
t3n
TSA
t4
t5
t12
7153a09/0498
B
t3
TSA
t4
t5
t12
The following features of the LAL afford a high level of safety:
Detector and flame simulation test are restarted on completion of the afterburn time
«t13». Open or not fully closed fuel valves immediately initiate lockout at the end of
afterburn time «t13». The test ends on completion of the prepurge time «t1» of the
next startup sequence
The correct functioning of the flame supervision circuit is automatically checked
during each burner startup sequence
The control contacts for the release of fuel are checked to ensure they have not
welded postpurge time «t6»
A built-in unit fuse protects the control contacts against overloads
Legend
C
D
BV...
Fuel valve
FS
Flame signal amplifier
t6
LK
Air damper
LR
Load controller
M...
Fan or burner motor
R
Control thermostat or pressurestat
RV
Modulating fuel valve
Z
Ignition transformer
A
Start command by «R»
t13
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
C
D
t6
t1
Prepurge time with air damper open
t3
Preignition time
t4
Interval fuel valve 1 (BV1) - fuel valve 2 (BV2) or fuel valve 1
(BV1) - load controller (LR)
t5
Interval between voltage at terminal 19 and terminal 20
t6
Postpurge time
t7
Interval between start command and power at terminal 7
t11
Air damper running time to the OPEN position
t12
Air damper running time to the low-fire position
t13
t13
Permissible afterburn time
TSA
Ignition safety time
11/24
CC1N7153en
21.09.2016
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