20/22
Building Technologies CC1N7435en
HVAC Products 11.01.2007
Internal diagram and time diagram of the programming mechanisms (cont’d)
LGB22... / LGB32...
Legend
AL Alarm
AR Load relay with contact «ar»
AS Unit fuse
BR Locking relay with contact «br»
BV... Fuel valve
EK... Lockout reset button
FR Flame relay
GP Gas pressure switch
HS Mains isolator
ION Ionization probe
L1 Lockout warning lamp
LP Air pressure switch
M Fan motor
MS Synchronous motor
R Control thermostat or pressurestat
SB Safety limit thermostat
W Limit thermostat or pressure switch
GP/
SB
W
R
HS
0 I
L
N
M
LP
7435i02/0704
Z
BV2
BV1
EK2
AL
EK1
12
3
1)
6
11
1
7
5
4
9
8
10
2
a
b
br
AS
I
ar
a
b
a
b
FR
AR
III
a
b
IV
ab
fr
a
b
II
ab
VIII
ab
V
a
b
VI
a
b
IX
ab
VII
a
b
L1
BR
MS
ION
1
Nur LGB22...
1
sw
QRC1...
12
br
bl
2
Nur LGB32...
Z Ignition transformer
A Start position (switching on)
B Operating position of burner
C Operating position of programming mechanism or start
position
I...IX Cam switches
tw Waiting time
TSA Ignition safety time
T Total running time of programming mechanism
t1 Prepurge time
t3 Preignition time
t4 Interval «BV1 – BV2» or «BV1 – LR»
t10 Specified time for air pressure signal
t11 Programmed opening time for actuator «SA»
t12 Programmed closing time for actuator «SA»
t20 Interval up to self-shutdown of programming
mechanism
A
B
C
7435f05/1299
9
4
7
5
3
T = 81 s
FR
a
b
AR
IX
VIII
VII
VI
V
IV
III
II
I
tw t11 + t10 t1 t12
t3
TSA
t4
t20
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
1) Resistance between terminal 3 and «N» must not ex-
ceed 1.6 k
Ω
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