User Manual

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Building Technologies Division CC1N7808en
Infrastructure & Cities Sector 13.05.2016
Connection diagrams (cont’d)
No.   LMG22... / LGB22... / LGB32...
Modulating operation  Prepurging at nominal load position «NL»
12
2
10 8
3611
9
7
4
5
1
HS
0
I
N
L
EK2
M
LP
GP
R/W
Z
BV1
ION
AL
LMG22... / LGB22... / LGB32...
N
18
2
75
6
3
4
9
R1
R3
B
b1
b2
A
a1
a2
I
M
II
III
2)
V
6
LK
RV
1)
2)
7808a14/1004
SQN3x.x6xAxxxx
SB
LR
*)
Si
1)
2)
*)
Diagram shows arrangement for
modulating operation
The cams of switches III and V are
rigidly connected. This ensures that
ignition takes place at the low-fire
position «KL»
Thermostat or similar with
changeover contact (2-wire control)
or 3-position controller for «on / off»
positioning pulses and neutral
position
SB
R/W
GP
M
BV1
9
LK
M
I
III
II
A
7808d12/1004
CB
D
LP
FS
RV
tw
t1
LKP
NL
KL
ZU
I
II
III
V
entspr. 5°
I
III
t
SA
LR *)
Program sequence diagram shows
modulating operation
Attention!
If the contacts of switch V welded in position 4  9, supervision of the ignition load position would be negated and
not be detected in operation. This means that the circuit is not safety-related but only used for supervision
purposes. The user must ensure that in the event of failure (should the burner ignite at nominal load «NL»), no
damage will occur.