21/22
Building Technologies
CC1N7435en
HVAC Products
11.01.2007
Internal diagram and time diagram of the programming mechanisms (cont’d)
LGB41...
Legend
AL Alarm
AR
Load relay with contact «ar»
AS Unit
fuse
BR
Locking relay with contact «br»
BV... Fuel
valve
Dbr1 Wire
link
Dbr2
Wire link terminal 6-2 required when contact «bv» or «zv1»
is missing
EK...
Lockout reset button
FR Flame
relay
GP Gas
pressure
switch
HR Main
burner
HS Mains
isolator
ION Ionization
probe
L1
Lockout warning lamp
M Fan
motor
MS Synchronous
motor
R
Control thermostat or pressurestat
SB Safety
limit
thermostat
W
Limit thermostat or pressure switch
Z Ignition
transformer
ZR Pilot
burner
ZV1
Pilot gas valve in place of «BV1» in the case of pilot
burners with main flame supervision
tw Waiting
time
TSA Ignition
safety
time
T
Total running time of programming mechanism
t3 Preignition
time
t4
Interval «BV1 – BV2»
t9 Second
safety
time
t20
Interval up to self-shutdown of the programming
mechanism
A
Start position ( switching on)
B
Operating position of burner
C
Operating position of programming mechanism or start
position
I...IX Cam
switches
1)
Resistance between terminal 3 and «N» must not exceed
GP/
SB
W
R
M
HS
L N
743
5
i0
3
/050
4
ION
Dbr1
Z
BV1
Db
r2
EK2
AL
EK1
a
b
AS
br
12
I
a
b
a
b
ar
1)
3
III
b
a
FR
AR
MS
8
VIII
a
b
II
a
b
BR
L1
2 10
11
4
6
5
7
9 1
VII
b
b
a
IX
VI
b a
IV
a
V
a
fr
a
b
BV2
ZV1
0
I
A
B
C
6
11
4
7
5
tw
t3 TSA
t4
t20
t9
a
b
AR
FR
T = 40,5 s
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
a
b
I
II
III
IV
V
VI
VII
VIII
IX
7
4
35
f06/
03
01
ION
HR
BV1
BV2
7
435
s
0
1
/05
04
ION2
ION1
ZR
HR
BV2
ZV1
74
35
s
0
2
/05
04
1.6
k
Ω