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Connection diagrams (cont'd)
LGB22... / LGB32...
Burner controls for single- or 2-stage forced draft burners.
Air damper control for prepurging with nominal load air volume.
A
GP/SB
R/W
Nocke I
LK
M
tw
t11
t10
LP
Z
BV1
LR
FS
Application examples
Control of actuators of 2-stage or 2-stage modulating burners.
Prepurging («t1») with nominal load air volume.
For information about the actuators:
SQN3...: Refer to Data Sheet N7808
SQN7...: Refer to Data Sheet N7804
SQN9...: Refer to Data Sheet N7806
LGB22...
12
2
10
8
EK2
GP
AL
R/W
M
SB
N
1
8
2
7
HS
R3
0 I
b1
B
N
L
A
a1
M
I
II
SQN3...151... or SQN3...251...
* Note:
With 2-stage modulating burners (with gas control damper «RV»),
«BV2» and the dotted connection between terminals marked (*) are not
required.
16/22
Building Technologies
HVAC Products
B B´
C
t1
t12
t3
t4
TSA
7435f02/0700
3
6
11
9
5
7
4
Z
LP
S1)
BV1
LR
*
*
BV2
2)
5
6
3
4 9
b2
a2
LK
III
V
1)
5
RV
Flame supervision
LGB22...: With ionization probe or auxiliary unit AGQ1... for UV detector
QRA...
LGB32...: With blue-flame detector QRC1...
D
LGB22... / LGB32...
12
10
12
2
8
3
GP/
SB
W
R
6
HS
11
7
0 I
AL
L
EK2
4
N
5
LGB22.../32...
1
LR
9
SA
BV1/2
LGB22...
1
12
2
10
ION
GP
AL
W
R
SB
HS
6
0
I
R1
K2
N
L
R2
C1
SA
SQN90.220... / 2-stage modulating control
11
3
6
9
5
4
7
LR
LP
2
3 1
8
7
6
SA
10
BV1
Z
M
7435a10/0704
LKP
t1
NL
I
KL
III
III
Zu
II
8
3
9
6
11
5
EK2
LP
LR
M
8
10
2
1
3
7
9
R3
K1
III
C3
II
I
MS
2
Nur LGB22...
1
ION
Nur LGB32...
1
sw
br
QRC1...
12
bl
2
t
7
4
1
ION
Z
BV1
RV
LK
CC1N7435en
11.01.2007
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