Siemens LGB21.330A27 - Page 18

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Building Technologies CC1N7435en
HVAC Products 11.01.2007
Connection diagrams (cont’d)
LGB41...
Burner controls for atmospheric gas burners with or without fan. No actuator control. Flame supervision with ionization probe
GP/SB
R/W
Z
BV1
ZV1
BV2
FS
ABB´CD
12
7
4
11
5
1
7435f03/0301
tw
t3
TSA
t4
t9
12
2
10 8
3
6
11
7
9
4
5
1
GP/
SB
W
R
HS
0
L
N
AL
EK2
M
Dbr2
bv1
zv1
ZV1
Z
Dbr1
BV1
BV2
ION
7435a11/0704
bv2
Si
ION
HR
BV1
BV2
7435s01/0504
ION2 ION1
ZR
HR
BV2
ZV1
7435s02/0504
QRA... with auxiliary unit AGQ1... with LGB4... (Pictures
7435a21)
12
2
3
1
7435a21/0704
GP/SB
R/W
L
L
N
QRA
+
-
br
bl
rt
sw
AGQ1
sw bl
A Startup (switching on by «R») AL Alarm
B – B´ Interval for establishment of flame BV... Fuel valve
C Operation position of burner or release of the second stage bv... Auxiliary switch in the fuel valves (for control the closed position)
by load controller «LR» Dbr1 Wire link
D Shutdown by «R» Dbr2 Wire link, required when contacts «bv» or «zv1» is missing
EK2 Remote reset button
tw Waiting time ION Ionization probe
TSA Ignition safety time FS Flame signal
t3 Preignition time GP Gas pressure switch
t4 Interval «BV1 – BV2» HR Main ramp
t9 2. safety time HS Main switch
M (Auxiliary) fan motor
QRA... UV flame detector
QRC... Blue flame detector
bl Blue wire
br Brown wire
Required input signals rt Red wire
Burner control’s output signals sw Black wire
R Control thermostat or pressurestat
SB Safety limit thermostat
Si Primary fuse
W Limit thermostat
• Connection of valves with pilot burners with main flame Z Ignition transformer
supervision ZR Ignition ramp
•• Connection of valves with 2-stage atmospheric burners ZV1 Ignition gas valve
with supervision of the first stage («BV1») zv1 Auxiliary switch in ignition gas valve
Legend