User Manual

13/17
Building Technologies Division CC1N7808en
Infrastructure & Cities Sector 13.05.2016
Connection diagrams (cont’d)
No.   LMG22... / LGB22... / LGB32...
2-stage or 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
LR
ION
AL
LMG22... / LGB22... / LGB32...
N
18
2
75
6
3
4
9
B
b1
b2
A
a1
a2
I
M
II
III
V
5
LK
RV
1)
7808a15/1004
SQN3x.x5xAxxxx
*)
BV2
SB
R3
R1
**) **)
Si
1)
*)
**)
Diagram shows arrangement for
modulating operation
Thermostat or similar with changeover
contact (2-wire control) or 3-position
controller for «on / off» positioning pulses
and neutral position
In case of 2-stage modulating burners
(with gas damper «RV»), «BV2» and the
connection between the terminals
(shown as a broken line) will not be
needed
SB
R/W
GP
M
BV1
9
LK
M
I
III
II
A
7808d14/1204
CB D
LP
FS
RV
tw
t1
LKP
NL
KL
ZU
I
II
III
I
III
t
**
**
SA
LR *)
Program sequence diagram shows
modulating operation