During burner off times, the flame supervision circuit is live.
Lockout indication
a-b
Startup sequence
b-b’
Idle step (with no contact confirmation)
b(b’)-a Postpurge program
Burner control can immediately be reset after lockout:
Do not press the lockout reset button for more than 10 seconds
The sequence switch always travels to the start position first
After resetting
After rectification of a fault that led to shutdown
After each power failure
During this period of time, power is only fed to terminals 7 and 9...11.
Then, the LAL.... will program a new burner startup sequence
Specifications
Power supply
AC 230 V -15 / +10 %
for LAL2... on request AC 100 V -15 %...AC 110 V +10 %
Frequency
50 Hz -6 %...60 Hz +6 %
Absorption
AC 3.5 VA
Mounting position
optional
Protection IP
40
Perm. input current at terminal 1
AC 5 A max., 20 A peak
Perm. current rating of control terminals 3, 6, 7, 9...11, 15...20
4 A max., 20 A peak
Internal fuse
T6,3H250V according to IEC 127
External fuse
max. 10 A
Weight
Device 1000 g
Plug-in base 165 g
Sequence diagram
Key
t1
Prepurge time with air damper fully open
t2
Safety time
t3
Preignition time, short («Z» connected to terminal 16)
T3’
Preignition time, long («Z» connected to terminal 15)
t3n
Postignition time («Z» connected to terminal 15)
t4
Interval between voltage at terminals 18 and 19 («BV1-BV2»)
t5
Interval between voltage at terminals 19 and 20 («BV2» load
controller)
L
H
1
A S
b r1
a b
I
a
b
ar1
4
W
R
5
B
fr1
a
b
IX
X I
b
a
a
b
X III
X II
L 1
b r2
A R
B R
M
E
A
IV
II
X
V III
b
a a
b a
b
a
b
a
b
V
V I
III
S M
M
a
b
a
b
a r3
V II
a
b
X IV
fr2
F R
V
N
M 1
M 2
6
7
a r2
Q R B 1 ...
22
2 3 2 4
8
1 0
11
2 0
9
1 9
1 7
1 8
1 6
1 5
2
2 1
3
E K 1 *
N
A L
E K 2 *
1 (3 )
H
Z
B V 1
B V 2
v
a
z
m
M
L K
L R
7 1 5 3 a 0 7 /0 4 9 6
S
S A
sw
b l
b r
Q R C 1 ...
2 3
22
1
S B
A
t11
t7
t1
t12
t4
t3
t3 n
B
C
D
t6
t3"
t2
t5
t20
t13
t10*
t1 6
t8
20
4
7
1 9
8
17
15
9
9
10
*
I
II
III
IV
V
V I
V II
V III
IX
X
X I
X II
X III
X IV
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
*
1 2
16
11
1 8
Control output at terminal
Lockout position indication
