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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
Legend
General
Control of the burner
8/20
Building Technologies
HVAC Products
B
t3
t3n
TSA
t4
t5
t12
7153a09/0498
BV...
Fuel valve
FS
Flame signal amplifier
LK
Air damper
LR
Load controller
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
«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 «t6»
A built-in unit fuse protects the control contacts against overloads
-
-
Burner operation with or without postpurge
Fan motors with a current draw of up to 4 A can be connected directly → starting
-
current max. 20 A (for max. 20 ms)
Separate control outputs for
-
– preignition from start command
– postignition until shortly before the burner startup sequence is completed
– short preignition with postignition up to the end of «TSA»
-
Separate control outputs for the actuator's positioning directions «OPEN»,
«CLOSE» and «MIN»
Checked air damper operation to ensure prepurging with the nominal air volume
-
Checked positions:
-
- «CLOSED» or «MIN» on startup → low-fire position
- «OPEN» at the beginning of prepurging
- «MIN» on completion of prepurging
If the actuator does not drive the air damper to the required position, the burner
startup sequence will be stopped
2 control outputs for the release of the second and third output stage or for load
-
control
-
When load control is enabled, the control outputs for the actuator will be galvani-
cally separated from the burner control's control section
Connection facilities for
-
– remote lockout warning device
– remote reset
– remote emergency shutdown
-
In addition, with LAL2... / LAL3... / LAL4...:
– possibility of air pressure supervision with functional test of the air pressure
monitor on startup
– possibility of semiautomatic burner startup
Modulating expanding flame burner
C
D
A
T
R
P
t6
M1
M
~
M2
Z
BV1
R
LR
100%
M
min.
LK
0...
RV
t13
FS
M...
R
RV
Z
B
t7
t1
t3
TSA
t4
t5
t11
t12
7153a10/0498
Fan or burner motor
Control thermostat or pressurestat
Modulating fuel valve
Ignition transformer
C
D
t6
t13
CC1N7153en
20.04.2005
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