17/22
Building Technologies
CC1N7435en
HVAC Products
11.01.2007
Connection diagrams (cont’d)
LGB22... / LGB32...
HS
0
4
N
1
5
N
I
L
A
b1
a1
LGB22...
R/W
GP
12
AL
EK2
3
8
3
2
6
8
7
b2
a2
M
B
Z
LR
ION
BV1
4
1
1
2
10
9
5
7
BV2
III
II
I
IV
2
6
11
LP
M
Si
SB
N
I
HS
L
LGB22...
R/W
GP
12
EK2
3
8
Z
LR
5
ION
BV1
BV2
0
74
3
5a1
7/
070
4
B
C
A
a1
b1
c1
b2
a2
M
7
9
10
2
N
5
4
1
3
2
8
6
7
III
II
IV
I
6
11
AL
4
1
M
LKP
Zu
KL
NL
t
III
III
IV
IV
I
I
II
t1
TSA
t4
LP
Si
SB
5
2
SQN7...454 / 2-stage control
Single-wire control
SQN7...424 / 2-stage control
2-wire
control
Burner without fan and
without «LP»
LGB22... / LGB32...
2
3
11
6
AGK25
7435a04/0398
QRA... with auxiliary unit AGQ1... with LGB22... (diagram 7435a06)
12
2
11
1
7435a06/0704
GP/SB
R/W
L
L
N
QRA
+
-
br
bl rt
sw
AGQ1 sw
bl
Burner with fan control via auxiliary contactor («HS»)
with «LP»
LGB22... / LGB32...
12
2
3
11
6
GP/SB
R/W
L
N
M
HS
AGK25
LP
7435a16/1299
Legend
bl Blue
wire
br Brown
wire
rt Red
wire
sw Black
wire
TSA Ignition
safety
time
t1 Prepurge
time
t4
Interval «BV1 – BV2»
LGB22... / LGB32...: interval «BV1 - LR»
AL Alarm
LR Load
controller
BV...
Fuel valve
M
Fan motor
EK2
Remote reset button
NL
Nominal load
ION Ionization
probe
R
Control
thermostat or pressurestat
GP
Gas pressure switch
SB
Safety limit thermostat
HS
Mains isolator
Si
Primary fuse
KL Low-fire
W Limit
thermostat
LKP
Air damper position
Z
Ignition transformer
LP
Air pressure switch
Legend