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Connection diagrams (cont'd)
LGB22... / LGB32...
LGB22...
12
2
10
8
3
6
R/W
LP
EK2
GP
AL
M
SB
N
5
4
1
HS
0
I
a1
N
L
b1
C
A
SQN7...454 / 2-stage control
Single-wire control
Burner without fan and without «LP»
LGB22... / LGB32...
2
3
11
6
AGK25
7435a04/0398
Burner with fan control via auxiliary contactor («HS») with «LP»
LGB22... / LGB32...
12
2
3
GP/SB
HS AGK25 LP
R/W
M
L
N
7435a16/1299
Legend
TSA
Ignition safety time
t1
Prepurge time
t4
Interval «BV1 – BV2»
LGB22... / LGB32...: interval «BV1 - LR»
AL
Alarm
BV...
Fuel valve
EK2
Remote reset button
ION
Ionization probe
GP
Gas pressure switch
HS
Mains isolator
KL
Low-fire
LKP
Air damper position
LP
Air pressure switch
Building Technologies
HVAC Products
11
5
9
7
4
1
Z
LR
BV1
BV2
3
2
8
6
7
HS
b2
0
c1
LKP
NL
a2
KL
B
M
Zu
I
II
III
IV
5
11
6
LGB22...
R/W
ION
GP
SB
I
N
L
I
I
IV
IV
III
III
II
t
t1
TSA
t4
QRA... with auxiliary unit AGQ1... with LGB22... (diagram 7435a06)
12
2
GP/SB
R/W
L
br
bl rt
L
AGQ1 sw
N
7435a06/0704
QRA
LR
Load controller
M
Fan motor
NL
Nominal load
R
Control thermostat or pressurestat
SB
Safety limit thermostat
Si
Primary fuse
W
Limit thermostat
Z
Ignition transformer
2
10
8
11
12
3
6
9
LP
EK2
AL
M
N
4
5
1
3
b2
a1
a2
b1
A
M
I
II
SQN7...424 / 2-stage control
2-wire control
11
1
sw
bl
+
-
Legend
bl
Blue wire
br
Brown wire
rt
Red wire
sw Black wire
5
1
7
4
Z
ION
LR
1
2
BV1
BV2
2
8
6
7
B
III
IV
2
17/22
CC1N7435en
11.01.2007
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